首页 > 代码库 > C#/ASP.NET完善的DBHelper，配套Model生成器
C#/ASP.NET完善的DBHelper，配套Model生成器
支持Oracle、MSSQL、MySQL、SQLite四种数据库，支持事务，支持对象关系映射；已在多个项目中实际使用。
没有语法糖，学习成本几乎为0，拿来即用。
DBHelper类完整代码：
using System;using System.Collections.Generic;using System.ComponentModel;using System.Configuration;using System.Data;using System.Data.Common;using System.Data.Objects.DataClasses;using System.Data.OracleClient;using System.Data.SqlClient;using System.Data.SQLite;using System.Reflection;using System.Text;using System.Text.RegularExpressions;using Models;using MySql.Data.MySqlClient;/* --------------------------------------------- * 作 者：suxiang * 创建日期：2016年11月23日 * --------------------------------------------- */namespace DBUtil{ /// <summary> /// 数据库操作类 /// </summary> public static class DBHelper { #region 变量 /// <summary> /// 数据库类型 /// </summary> private static string m_DBType = ConfigurationManager.AppSettings["DBType"]; /// <summary> /// 数据库类型 /// </summary> private static bool m_AutoIncrement = ConfigurationManager.AppSettings["AutoIncrement"].ToLower() == "true" ? true : false; /// <summary> /// 数据库连接字符串 /// </summary> private static string m_ConnectionString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString(); /// <summary> /// 事务 /// </summary> [ThreadStatic] private static DbTransaction m_Tran; /// <summary> /// 带参数的SQL插入和修改语句中，参数前面的符号 /// </summary> private static string m_ParameterMark = GetParameterMark(); #endregion #region 生成变量 #region 生成 IDbCommand /// <summary> /// 生成 IDbCommand /// </summary> private static DbCommand GetCommand() { DbCommand command = null; switch (m_DBType) { case "oracle": command = new OracleCommand(); break; case "mssql": command = new SqlCommand(); break; case "mysql": command = new MySqlCommand(); break; case "sqlite": command = new SQLiteCommand(); break; } return command; } /// <summary> /// 生成 IDbCommand /// </summary> private static DbCommand GetCommand(string sql, DbConnection conn) { DbCommand command = null; switch (m_DBType) { case "oracle": command = new OracleCommand(sql); command.Connection = conn; break; case "mssql": command = new SqlCommand(sql); command.Connection = conn; break; case "mysql": command = new MySqlCommand(sql); command.Connection = conn; break; case "sqlite": command = new SQLiteCommand(sql); command.Connection = conn; break; } return command; } #endregion #region 生成 IDbConnection /// <summary> /// 生成 IDbConnection /// </summary> private static DbConnection GetConnection() { DbConnection conn = null; switch (m_DBType) { case "oracle": conn = new OracleConnection(m_ConnectionString); break; case "mssql": conn = new SqlConnection(m_ConnectionString); break; case "mysql": conn = new MySqlConnection(m_ConnectionString); break; case "sqlite": conn = new SQLiteConnection(m_ConnectionString); break; } return conn; } #endregion #region 生成 IDbDataAdapter /// <summary> /// 生成 IDbDataAdapter /// </summary> private static DbDataAdapter GetDataAdapter(DbCommand cmd) { DbDataAdapter dataAdapter = null; switch (m_DBType) { case "oracle": dataAdapter = new OracleDataAdapter(); dataAdapter.SelectCommand = cmd; break; case "mssql": dataAdapter = new SqlDataAdapter(); dataAdapter.SelectCommand = cmd; break; case "mysql": dataAdapter = new MySqlDataAdapter(); dataAdapter.SelectCommand = cmd; break; case "sqlite": dataAdapter = new SQLiteDataAdapter(); dataAdapter.SelectCommand = cmd; break; } return dataAdapter; } #endregion #region 生成 m_ParameterMark /// <summary> /// 生成 m_ParameterMark /// </summary> private static string GetParameterMark() { switch (m_DBType) { case "oracle": return ":"; case "mssql": return "@"; case "mysql": return "@"; case "sqlite": return ":"; } return ":"; } #endregion #region 生成 DbParameter /// <summary> /// 生成 DbParameter /// </summary> private static DbParameter GetDbParameter(string name, object vallue) { DbParameter dbParameter = null; switch (m_DBType) { case "oracle": dbParameter = new OracleParameter(name, vallue); break; case "mssql": dbParameter = new SqlParameter(name, vallue); break; case "mysql": dbParameter = new MySqlParameter(name, vallue); break; case "sqlite": dbParameter = new SQLiteParameter(name, vallue); break; } return dbParameter; } #endregion #endregion #region 基础方法 #region 执行简单SQL语句 #region Exists public static bool Exists(string sqlString) { SqlFilter(ref sqlString); using (DbConnection conn = GetConnection()) { using (DbCommand cmd = GetCommand(sqlString, conn)) { try { conn.Open(); object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return false; } else { return true; } } catch (Exception ex) { throw ex; } finally { cmd.Dispose(); conn.Close(); } } } } #endregion #region 执行SQL语句，返回影响的记录数 /// <summary> /// 执行SQL语句，返回影响的记录数 /// </summary> /// <param name="sqlString">SQL语句</param> /// <returns>影响的记录数</returns> public static int ExecuteSql(string sqlString) { SqlFilter(ref sqlString); DbConnection conn = m_Tran == null ? GetConnection() : m_Tran.Connection; using (DbCommand cmd = GetCommand(sqlString, conn)) { try { if (conn.State != ConnectionState.Open) conn.Open(); if (m_Tran != null) cmd.Transaction = m_Tran; int rows = cmd.ExecuteNonQuery(); return rows; } catch (Exception ex) { throw new Exception(ex.Message); } finally { cmd.Dispose(); if (m_Tran == null) conn.Close(); } } } #endregion #region 执行一条计算查询结果语句，返回查询结果 /// <summary> /// 执行一条计算查询结果语句，返回查询结果（object） /// </summary> /// <param name="sqlString">计算查询结果语句</param> /// <returns>查询结果（object）</returns> public static object GetSingle(string sqlString) { SqlFilter(ref sqlString); using (DbConnection conn = GetConnection()) { using (DbCommand cmd = GetCommand(sqlString, conn)) { try { if (conn.State != ConnectionState.Open) conn.Open(); object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (Exception ex) { throw ex; } finally { cmd.Dispose(); } } } } #endregion #region 执行查询语句，返回IDataReader /// <summary> /// 执行查询语句，返回IDataReader ( 注意：调用该方法后，一定要对IDataReader进行Close ) /// </summary> /// <param name="sqlString">查询语句</param> /// <returns>IDataReader</returns> public static DbDataReader ExecuteReader(string sqlString) { SqlFilter(ref sqlString); DbConnection conn = GetConnection(); DbCommand cmd = GetCommand(sqlString, conn); try { if (conn.State != ConnectionState.Open) conn.Open(); DbDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); return myReader; } catch (Exception ex) { throw ex; } } #endregion #region 执行查询语句，返回DataSet /// <summary> /// 执行查询语句，返回DataSet /// </summary> /// <param name="sqlString">查询语句</param> /// <returns>DataSet</returns> public static DataSet Query(string sqlString) { SqlFilter(ref sqlString); using (DbConnection conn = GetConnection()) { DataSet ds = new DataSet(); try { conn.Open(); using (DbCommand cmd = GetCommand(sqlString, conn)) { DbDataAdapter adapter = GetDataAdapter(cmd); adapter.Fill(ds, "ds"); } } catch (Exception ex) { throw ex; } finally { conn.Close(); } return ds; } } #endregion #region SQL过滤，防注入 /// <summary> /// SQL过滤，防注入 /// </summary> /// <param name="sql">sql</param> public static void SqlFilter(ref string sql) { List<string> keywordList = new List<string>() { "net localgroup", "net user", "xp_cmdshell", "exec", "execute", "truncate", "drop", "restore", "create", "alter", "rename", "insert", "update", "delete", "select"}; string ignore = string.Empty; string upperSql = sql.ToUpper().Trim(); foreach (string keyword in keywordList) { if (upperSql.IndexOf(keyword.ToUpper()) == 0) { ignore = keyword; } } foreach (string keyword in keywordList) { if (ignore.ToUpper() == keyword.ToUpper()) continue; Regex regex = new Regex(keyword, RegexOptions.IgnoreCase); sql = regex.Replace(sql, string.Empty); } } #endregion #endregion #region 执行带参数的SQL语句 #region 执行SQL语句，返回影响的记录数 /// <summary> /// 执行SQL语句，返回影响的记录数 /// </summary> /// <param name="SQLString">SQL语句</param> /// <returns>影响的记录数</returns> public static int ExecuteSql(string SQLString, params DbParameter[] cmdParms) { DbConnection conn = m_Tran == null ? GetConnection() : m_Tran.Connection; using (DbCommand cmd = GetCommand()) { try { PrepareCommand(cmd, conn, m_Tran, SQLString, cmdParms); int rows = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return rows; } catch (Exception ex) { throw ex; } finally { cmd.Dispose(); if (m_Tran == null) conn.Close(); } } } #endregion #region 执行查询语句，返回IDataReader /// <summary> /// 执行查询语句，返回IDataReader ( 注意：调用该方法后，一定要对IDataReader进行Close ) /// </summary> /// <param name="strSQL">查询语句</param> /// <returns>IDataReader</returns> public static DbDataReader ExecuteReader(string sqlString, params DbParameter[] cmdParms) { DbConnection conn = GetConnection(); DbCommand cmd = GetCommand(); try { PrepareCommand(cmd, conn, null, sqlString, cmdParms); DbDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return myReader; } catch (Exception ex) { throw ex; } } #endregion #region 执行查询语句，返回DataSet /// <summary> /// 执行查询语句，返回DataSet /// </summary> /// <param name="sqlString">查询语句</param> /// <returns>DataSet</returns> public static DataSet Query(string sqlString, params DbParameter[] cmdParms) { DbConnection conn = GetConnection(); DbCommand cmd = GetCommand(); PrepareCommand(cmd, conn, null, sqlString, cmdParms); using (DbDataAdapter da = GetDataAdapter(cmd)) { DataSet ds = new DataSet(); try { da.Fill(ds, "ds"); cmd.Parameters.Clear(); } catch (Exception ex) { throw ex; } finally { cmd.Dispose(); conn.Close(); } return ds; } } #endregion #region PrepareCommand private static void PrepareCommand(DbCommand cmd, DbConnection conn, DbTransaction trans, string cmdText, DbParameter[] cmdParms) { if (conn.State != ConnectionState.Open) conn.Open(); cmd.Connection = conn; cmd.CommandText = cmdText; if (trans != null) cmd.Transaction = trans; cmd.CommandType = CommandType.Text; if (cmdParms != null) { foreach (DbParameter parm in cmdParms) { cmd.Parameters.Add(parm); } } } #endregion #endregion #endregion #region 增删改查 #region 获取最大编号 /// <summary> /// 获取最大编号 /// </summary> /// <typeparam name="T">实体Model</typeparam> /// <param name="key">主键</param> public static int GetMaxID<T>(string key) { Type type = typeof(T); string sql = null; switch (m_DBType) { case "oracle": sql = string.Format("SELECT Max({0}) FROM {1}", key, type.Name); break; case "mssql": sql = string.Format("SELECT Max({0}) FROM {1}", key, type.Name); break; case "mysql": sql = string.Format("SELECT Max({0}) FROM {1}", key, type.Name); break; case "sqlite": sql = string.Format("SELECT Max(cast({0} as int)) FROM {1}", key, type.Name); break; } using (DbConnection conn = GetConnection()) { using (IDbCommand cmd = GetCommand(sql, conn)) { try { conn.Open(); object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return 1; } else { return int.Parse(obj.ToString()) + 1; } } catch (Exception ex) { throw ex; } finally { cmd.Dispose(); conn.Close(); } } } } #endregion #region 添加 /// <summary> /// 添加 /// </summary> public static void Insert(object obj) { Insert(obj, m_AutoIncrement); } /// <summary> /// 添加 /// </summary> public static void Insert(object obj, bool autoIncrement) { StringBuilder strSql = new StringBuilder(); Type type = obj.GetType(); strSql.Append(string.Format("insert into {0}(", type.Name)); PropertyInfo[] propertyInfoList = GetEntityProperties(type); List<string> propertyNameList = new List<string>(); int savedCount = 0; foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(IsIdAttribute), false).Length > 0 && autoIncrement) return; if (propertyInfo.GetCustomAttributes(typeof(IsDBFieldAttribute), false).Length > 0) { propertyNameList.Add(propertyInfo.Name); savedCount++; } } strSql.Append(string.Format("{0})", string.Join(",", propertyNameList.ToArray()))); strSql.Append(string.Format(" values ({0})", string.Join(",", propertyNameList.ConvertAll<string>(a => m_ParameterMark + a).ToArray()))); DbParameter[] parameters = new DbParameter[savedCount]; int k = 0; for (int i = 0; i < propertyInfoList.Length && savedCount > 0; i++) { PropertyInfo propertyInfo = propertyInfoList[i]; if (propertyInfo.GetCustomAttributes(typeof(IsIdAttribute), false).Length > 0 && autoIncrement) return; if (propertyInfo.GetCustomAttributes(typeof(IsDBFieldAttribute), false).Length > 0) { object val = propertyInfo.GetValue(obj, null); DbParameter param = GetDbParameter(m_ParameterMark + propertyInfo.Name, val == null ? DBNull.Value : val); parameters[k++] = param; } } ExecuteSql(strSql.ToString(), parameters); } #endregion #region 修改 /// <summary> /// 修改 /// </summary> public static void Update(object obj) { object oldObj = Find(obj, false); if (oldObj == null) throw new Exception("无法获取到旧数据"); StringBuilder strSql = new StringBuilder(); Type type = obj.GetType(); strSql.Append(string.Format("update {0} ", type.Name)); PropertyInfo[] propertyInfoList = GetEntityProperties(type); List<string> propertyNameList = new List<string>(); int savedCount = 0; foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(IsDBFieldAttribute), false).Length > 0) { object oldVal = propertyInfo.GetValue(oldObj, null); object val = propertyInfo.GetValue(obj, null); if (!object.Equals(oldVal, val)) { propertyNameList.Add(propertyInfo.Name); savedCount++; } } } strSql.Append(string.Format(" set ")); DbParameter[] parameters = new DbParameter[savedCount]; StringBuilder sbPros = new StringBuilder(); int k = 0; for (int i = 0; i < propertyInfoList.Length && savedCount > 0; i++) { PropertyInfo propertyInfo = propertyInfoList[i]; if (propertyInfo.GetCustomAttributes(typeof(IsDBFieldAttribute), false).Length > 0) { object oldVal = propertyInfo.GetValue(oldObj, null); object val = propertyInfo.GetValue(obj, null); if (!object.Equals(oldVal, val)) { sbPros.Append(string.Format(" {0}={1}{0},", propertyInfo.Name, m_ParameterMark)); DbParameter param = GetDbParameter(m_ParameterMark + propertyInfo.Name, val == null ? DBNull.Value : val); parameters[k++] = param; } } } if (sbPros.Length > 0) { strSql.Append(sbPros.ToString(0, sbPros.Length - 1)); } strSql.Append(string.Format(" where {0}=‘{1}‘", GetIdName(obj.GetType()), GetIdVal(obj).ToString())); if (savedCount > 0) { ExecuteSql(strSql.ToString(), parameters); } } #endregion #region 删除 /// <summary> /// 根据Id删除 /// </summary> public static void Delete<T>(int id) { Type type = typeof(T); StringBuilder sbSql = new StringBuilder(); DbParameter[] cmdParms = new DbParameter[1]; cmdParms[0] = GetDbParameter(m_ParameterMark + GetIdName(type), id); sbSql.Append(string.Format("delete from {0} where {2}={1}{2}", type.Name, m_ParameterMark, GetIdName(type))); ExecuteSql(sbSql.ToString(), cmdParms); } /// <summary> /// 根据Id集合删除 /// </summary> public static void BatchDelete<T>(string ids) { if (string.IsNullOrWhiteSpace(ids)) return; Type type = typeof(T); StringBuilder sbSql = new StringBuilder(); string[] idArr = ids.Split(‘,‘); DbParameter[] cmdParms = new DbParameter[idArr.Length]; sbSql.AppendFormat("delete from {0} where {1} in (", type.Name, GetIdName(type)); for (int i = 0; i < idArr.Length; i++) { cmdParms[i] = GetDbParameter(m_ParameterMark + GetIdName(type) + i, idArr[i]); sbSql.AppendFormat("{1}{2}{3},", type.Name, m_ParameterMark, GetIdName(type), i); } sbSql.Remove(sbSql.Length - 1, 1); sbSql.Append(")"); ExecuteSql(sbSql.ToString(), cmdParms); } /// <summary> /// 根据条件删除 /// </summary> public static void Delete<T>(string conditions) { if (string.IsNullOrWhiteSpace(conditions)) return; Type type = typeof(T); StringBuilder sbSql = new StringBuilder(); SqlFilter(ref conditions); sbSql.Append(string.Format("delete from {0} where {1}", type.Name, conditions)); ExecuteSql(sbSql.ToString()); } #endregion #region 获取实体 #region 根据实体获取实体 /// <summary> /// 根据实体获取实体 /// </summary> private static object Find(object obj, bool readCache = true) { Type type = obj.GetType(); object result = Activator.CreateInstance(type); bool hasValue = http://www.mamicode.com/false; IDataReader rd = null; string sql = string.Format("select * from {0} where {2}=‘{1}‘", type.Name, GetIdVal(obj), GetIdName(obj.GetType())); try { rd = ExecuteReader(sql); PropertyInfo[] propertyInfoList = GetEntityProperties(type); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { hasValue = true; IDataRecord record = rd; foreach (PropertyInfo pro in propertyInfoList) { if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } if (hasValue) { return result; } else { return null; } } #endregion #region 根据Id获取实体 /// <summary> /// 根据Id获取实体 /// </summary> private static object FindById(Type type, int id) { object result = Activator.CreateInstance(type); IDataReader rd = null; bool hasValue = http://www.mamicode.com/false; string sql = string.Format("select * from {0} where {2}=‘{1}‘", type.Name, id, GetIdName(type)); try { rd = ExecuteReader(sql); PropertyInfo[] propertyInfoList = GetEntityProperties(type); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { hasValue = true; IDataRecord record = rd; foreach (PropertyInfo pro in propertyInfoList) { if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } if (hasValue) { return result; } else { return null; } } #endregion #region 根据Id获取实体 /// <summary> /// 根据Id获取实体 /// </summary> public static T FindById<T>(string id) where T : new() { Type type = typeof(T); T result = (T)Activator.CreateInstance(type); IDataReader rd = null; bool hasValue = http://www.mamicode.com/false; string sql = string.Format("select * from {0} where {2}=‘{1}‘", type.Name, id, GetIdName(type)); try { rd = ExecuteReader(sql); PropertyInfo[] propertyInfoList = GetEntityProperties(type); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { hasValue = true; IDataRecord record = rd; foreach (PropertyInfo pro in propertyInfoList) { if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } if (hasValue) { return result; } else { return default(T); } } #endregion #region 根据sql获取实体 /// <summary> /// 根据sql获取实体 /// </summary> public static T FindBySql<T>(string sql) where T : new() { Type type = typeof(T); T result = (T)Activator.CreateInstance(type); IDataReader rd = null; bool hasValue = http://www.mamicode.com/false; try { rd = ExecuteReader(sql); PropertyInfo[] propertyInfoList = GetEntityProperties(type); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { hasValue = true; IDataRecord record = rd; foreach (PropertyInfo pro in propertyInfoList) { if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } if (hasValue) { return result; } else { return default(T); } } #endregion #endregion #region 获取列表 /// <summary> /// 获取列表 /// </summary> public static List<T> FindListBySql<T>(string sql) where T : new() { List<T> list = new List<T>(); object obj; IDataReader rd = null; try { rd = ExecuteReader(sql); if (typeof(T) == typeof(int)) { while (rd.Read()) { list.Add((T)rd[0]); } } else if (typeof(T) == typeof(string)) { while (rd.Read()) { list.Add((T)rd[0]); } } else { PropertyInfo[] propertyInfoList = (typeof(T)).GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { IDataRecord record = rd; obj = new T(); foreach (PropertyInfo pro in propertyInfoList) { if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(obj, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } list.Add((T)obj); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } return list; } #endregion #region 获取列表 /// <summary> /// 获取列表 /// </summary> public static List<T> FindListBySql<T>(string sql, params DbParameter[] cmdParms) where T : new() { List<T> list = new List<T>(); object obj; IDataReader rd = null; try { rd = ExecuteReader(sql, cmdParms); if (typeof(T) == typeof(int)) { while (rd.Read()) { list.Add((T)rd[0]); } } else if (typeof(T) == typeof(string)) { while (rd.Read()) { list.Add((T)rd[0]); } } else { PropertyInfo[] propertyInfoList = (typeof(T)).GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { IDataRecord record = rd; obj = new T(); foreach (PropertyInfo pro in propertyInfoList) { if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(obj, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } list.Add((T)obj); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } return list; } #endregion #region 分页获取列表 /// <summary> /// 分页(任意entity，尽量少的字段) /// </summary> public static PagerModel FindPageBySql<T>(string sql, string orderby, int pageSize, int currentPage) where T : new() { PagerModel pagerModel = new PagerModel(currentPage, pageSize); using (DbConnection connection = GetConnection()) { connection.Open(); IDbCommand cmd = null; StringBuilder sb = new StringBuilder(); string commandText = null; int startRow = 0; int endRow = 0; switch (m_DBType) { case "oracle": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); pagerModel.totalRows = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1); endRow = startRow + pageSize; sb.Append("select * from ( select row_limit.*, rownum rownum_ from ("); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.Append(" ) row_limit where rownum <= "); sb.Append(endRow); sb.Append(" ) where rownum_ >"); sb.Append(startRow); #endregion break; case "mssql": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); pagerModel.totalRows = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1) + 1; endRow = startRow + pageSize - 1; sb.Append(string.Format(@" select * from (select ROW_NUMBER() over({1}) as rowNumber, t.* from ({0}) t) tempTable where rowNumber between {2} and {3} ", sql, orderby, startRow, endRow)); #endregion break; case "mysql": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); pagerModel.totalRows = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1); sb.Append("select * from ("); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.AppendFormat(" ) row_limit limit {0},{1}", startRow, pageSize); #endregion break; case "sqlite": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); pagerModel.totalRows = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.AppendFormat(" limit {0} offset {1}", pageSize, startRow); #endregion break; } List<T> list = FindListBySql<T>(sb.ToString()); pagerModel.result = list; } return pagerModel; } #endregion #region 分页获取列表 /// <summary> /// 分页(任意entity，尽量少的字段) /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <returns></returns> public static PagerModel FindPageBySql<T>(string sql, string orderby, int pageSize, int currentPage, params DbParameter[] cmdParms) where T : new() { PagerModel pagerModel = new PagerModel(currentPage, pageSize); using (DbConnection connection = GetConnection()) { connection.Open(); IDbCommand cmd = null; StringBuilder sb = new StringBuilder(); string commandText = null; int startRow = 0; int endRow = 0; switch (m_DBType) { case "oracle": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); foreach (DbParameter parm in cmdParms) cmd.Parameters.Add(parm); pagerModel.totalRows = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1); endRow = startRow + pageSize; sb.Append("select * from ( select row_limit.*, rownum rownum_ from ("); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.Append(" ) row_limit where rownum <= "); sb.Append(endRow); sb.Append(" ) where rownum_ >"); sb.Append(startRow); #endregion break; case "mssql": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); foreach (DbParameter parm in cmdParms) cmd.Parameters.Add(parm); pagerModel.totalRows = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1) + 1; endRow = startRow + pageSize - 1; sb.Append(string.Format(@" select * from (select ROW_NUMBER() over({1}) as rowNumber, t.* from ({0}) t) tempTable where rowNumber between {2} and {3} ", sql, orderby, startRow, endRow)); #endregion break; case "mysql": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); foreach (DbParameter parm in cmdParms) cmd.Parameters.Add(parm); pagerModel.totalRows = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1); sb.Append("select * from ("); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.AppendFormat(" ) row_limit limit {0},{1}", startRow, pageSize); #endregion break; case "sqlite": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); foreach (DbParameter parm in cmdParms) cmd.Parameters.Add(parm); pagerModel.totalRows = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.AppendFormat(" limit {0} offset {1}", pageSize, startRow); #endregion break; } List<T> list = FindListBySql<T>(sb.ToString(), cmdParms); pagerModel.result = list; } return pagerModel; } #endregion #region 分页获取列表 /// <summary> /// 分页(任意entity，尽量少的字段) /// </summary> public static DataSet FindPageBySql(string sql, string orderby, int pageSize, int currentPage, out int totalCount, params DbParameter[] cmdParms) { DataSet ds = null; using (DbConnection connection = GetConnection()) { connection.Open(); IDbCommand cmd = null; StringBuilder sb = new StringBuilder(); string commandText = null; int startRow = 0; int endRow = 0; totalCount = 0; switch (m_DBType) { case "oracle": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); foreach (DbParameter parm in cmdParms) cmd.Parameters.Add(parm); totalCount = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1); endRow = startRow + pageSize; sb.Append("select * from ( select row_limit.*, rownum rownum_ from ("); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.Append(" ) row_limit where rownum <= "); sb.Append(endRow); sb.Append(" ) where rownum_ >"); sb.Append(startRow); #endregion break; case "mssql": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); foreach (DbParameter parm in cmdParms) cmd.Parameters.Add(parm); totalCount = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1) + 1; endRow = startRow + pageSize - 1; sb.Append(string.Format(@" select * from (select ROW_NUMBER() over({1}) as rowNumber, t.* from ({0}) t) tempTable where rowNumber between {2} and {3} ", sql, orderby, startRow, endRow)); #endregion break; case "mysql": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); foreach (DbParameter parm in cmdParms) cmd.Parameters.Add(parm); totalCount = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1); sb.Append("select * from ("); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.AppendFormat(" ) row_limit limit {0},{1}", startRow, pageSize); #endregion break; case "sqlite": #region 分页查询语句 commandText = string.Format("select count(*) from ({0}) T", sql); cmd = GetCommand(commandText, connection); foreach (DbParameter parm in cmdParms) cmd.Parameters.Add(parm); totalCount = int.Parse(cmd.ExecuteScalar().ToString()); startRow = pageSize * (currentPage - 1); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.AppendFormat(" limit {0} offset {1}", pageSize, startRow); #endregion break; } ds = Query(sql, cmdParms); } return ds; } #endregion #region getReaderValue 转换数据 /// <summary> /// 转换数据 /// </summary> private static Object getReaderValue(Object rdValue, Type ptype) { if (ptype == typeof(double)) return Convert.ToDouble(rdValue); if (ptype == typeof(decimal)) return Convert.ToDecimal(rdValue); if (ptype == typeof(int)) return Convert.ToInt32(rdValue); if (ptype == typeof(long)) return Convert.ToInt64(rdValue); if (ptype == typeof(DateTime)) return Convert.ToDateTime(rdValue); if (ptype == typeof(Nullable<double>)) return Convert.ToDouble(rdValue); if (ptype == typeof(Nullable<decimal>)) return Convert.ToDecimal(rdValue); if (ptype == typeof(Nullable<int>)) return Convert.ToInt32(rdValue); if (ptype == typeof(Nullable<long>)) return Convert.ToInt64(rdValue); if (ptype == typeof(Nullable<DateTime>)) return Convert.ToDateTime(rdValue); return rdValue; } #endregion #region 获取主键名称 /// <summary> /// 获取主键名称 /// </summary> public static string GetIdName(Type type) { PropertyInfo[] propertyInfoList = GetEntityProperties(type); foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(IsIdAttribute), false).Length > 0) { return propertyInfo.Name; } } return "Id"; } #endregion #region 获取主键值 /// <summary> /// 获取主键名称 /// </summary> public static object GetIdVal(object val) { string idName = GetIdName(val.GetType()); if (!string.IsNullOrWhiteSpace(idName)) { return val.GetType().GetProperty(idName).GetValue(val, null); } return 0; } #endregion #region 获取实体类属性 /// <summary> /// 获取实体类属性 /// </summary> private static PropertyInfo[] GetEntityProperties(Type type) { List<PropertyInfo> result = new List<PropertyInfo>(); PropertyInfo[] propertyInfoList = type.GetProperties(); foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(EdmRelationshipNavigationPropertyAttribute), false).Length == 0 && propertyInfo.GetCustomAttributes(typeof(BrowsableAttribute), false).Length == 0) { result.Add(propertyInfo); } } return result.ToArray(); } #endregion #region 获取基类 /// <summary> /// 获取基类 /// </summary> public static Type GetBaseType(Type type) { while (type.BaseType != null && type.BaseType.Name != typeof(Object).Name) { type = type.BaseType; } return type; } #endregion #endregion #region 事务 #region 开始事务 /// <summary> /// 开始事务 /// </summary> public static void BeginTransaction() { DbConnection conn = GetConnection(); if (conn.State != ConnectionState.Open) conn.Open(); m_Tran = conn.BeginTransaction(); } #endregion #region 提交事务 /// <summary> /// 提交事务 /// </summary> public static void CommitTransaction() { if (m_Tran == null) return; //防止重复提交 DbConnection conn = m_Tran.Connection; try { m_Tran.Commit(); } catch (Exception ex) { m_Tran.Rollback(); } finally { if (conn.State == ConnectionState.Open) conn.Close(); m_Tran.Dispose(); m_Tran = null; } } #endregion #region 回滚事务(出错时调用该方法回滚) /// <summary> /// 回滚事务(出错时调用该方法回滚) /// </summary> public static void RollbackTransaction() { if (m_Tran == null) return; //防止重复回滚 DbConnection conn = m_Tran.Connection; m_Tran.Rollback(); if (conn.State == ConnectionState.Open) conn.Close(); } #endregion #endregion }}
说明：DBHelper中对事务变量private static DbTransaction m_Tran使用了[ThreadStatic]标签，以支持多用户并发；但是如果是单个用户使用多线程并发请求服务器，可能这种方式的数据库事务是不支持的，不过一般项目没有这种需求，如果有请使用HttpContext.Current.Items改写或者其它方法改写。
Web.config配置：
<connectionStrings> <add name="DefaultConnection" connectionString="server=localhost;database=netcms3.0;user id=root;password=root;character set=gbk;" /></connectionStrings><appSettings> <!--数据库类型--> <add key="DBType" value="mysql"/> <!--数据库自增--> <add key="AutoIncrement" value="false"/></appSettings>
说明：对于SQL Server数据库，通过<add key="AutoIncrement" value="http://www.mamicode.com/false"/>来设置是否使用数据库自增。
DBHelper类库需要引用的程序集：
除VS2012自带的DLL外需要的DLL：
MySql.Data.dll
System.Data.SQLite.dll
其中Models类库如下：
说明：Models目录中的类及其属性和数据库中的表和字段是完全对应的，Models全部由生成器生成，并且不允许手动修改。ExtModels目录中的类是扩展类，主要用于查询与显示，比如表中存的是code，但你需要关联查询另一张表中的name，就可以在这个扩展类中扩展一个用于显示的name字段。Models和ExtModels目录的中类都是partial修饰。
PagerModel类：
using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Web;namespace Models{ /// <summary> /// 分页 /// </summary> public class PagerModel { #region 字段 /// <summary> /// 当前页数 /// </summary> public int page { get; set; } /// <summary> /// 每页记录数 /// </summary> public int rows { get; set; } /// <summary> /// 排序字段 /// </summary> public string sort { get; set; } /// <summary> /// 排序的方式asc，desc /// </summary> public string order { get; set; } /// <summary> /// 记录 /// </summary> public object result { get; set; } /// <summary> /// 记录数 /// </summary> public int totalRows { get; set; } #endregion #region 构造函数 public PagerModel() { } /// <summary> /// /// </summary> /// <param name="page">当前页数</param> /// <param name="rows">每页记录数</param> public PagerModel(int page, int rows) { this.page = page; this.rows = rows; } #endregion #region 扩展字段 /// <summary> /// 总页数 /// </summary> public int pageCount { get { return (totalRows - 1) / rows + 1; } } /// <summary> /// 上一页 /// </summary> public int prePage { get { if (page - 1 > 0) { return page - 1; } return 1; } } /// <summary> /// 下一页 /// </summary> public int nextPage { get { if (page + 1 < pageCount) { return page + 1; } return pageCount; } } #endregion }}
IsIdAttribute类：
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Models{ /// <summary> /// 标识该属性是主健 /// </summary> [Serializable, AttributeUsage(AttributeTargets.Property | AttributeTargets.Class)] public class IsIdAttribute : Attribute { }}
IsDBFieldAttribute类：
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Models{ /// <summary> /// 标识该属性是数据库字段 /// </summary> [Serializable, AttributeUsage(AttributeTargets.Property | AttributeTargets.Class)] public class IsDBFieldAttribute : Attribute { }}
Models示例：
using System;using System.Collections.Generic;using System.Linq;namespace Models{ /// <summary> /// 内容详情 /// </summary> [Serializable] public partial class cms_content { /// <summary> /// 编号 /// </summary> [IsId] [IsDBField] public int id { get; set; } /// <summary> /// 所属栏目ID /// </summary> [IsDBField] public int? channelId { get; set; } /// <summary> /// 标题 /// </summary> [IsDBField] public string title { get; set; } /// <summary> /// 内容 /// </summary> [IsDBField] public string contents { get; set; } /// <summary> /// 作者 /// </summary> [IsDBField] public string author { get; set; } /// <summary> /// 阅读次数 /// </summary> [IsDBField] public int? readCount { get; set; } /// <summary> /// 发布时间 /// </summary> [IsDBField] public DateTime? publishTime { get; set; } /// <summary> /// 发布者 /// </summary> [IsDBField] public int? publishUserId { get; set; } /// <summary> /// 审核(0待审1通过2不通过) /// </summary> [IsDBField] public int? audit { get; set; } /// <summary> /// 审核人 /// </summary> [IsDBField] public int? auditUserId { get; set; } /// <summary> /// 审核时间 /// </summary> [IsDBField] public DateTime? auditTime { get; set; } /// <summary> /// 页面关键词 /// </summary> [IsDBField] public string keywords { get; set; } /// <summary> /// 页面描述 /// </summary> [IsDBField] public string description { get; set; } /// <summary> /// 页面链接 /// </summary> [IsDBField] public string pageUrl { get; set; } /// <summary> /// 内容封面 /// </summary> [IsDBField] public string imgUrl { get; set; } /// <summary> /// 是否链接(0否1是) /// </summary> [IsDBField] public int? isPageUrl { get; set; } /// <summary> /// 模板(模板文件名，例：content.html) /// </summary> [IsDBField] public string template { get; set; } /// <summary> /// 推荐(1推荐0不推荐) /// </summary> [IsDBField] public int? recommend { get; set; } }}
ExtModels示例：
using System;using System.Collections.Generic;using System.Linq;namespace Models{ /// <summary> /// 内容详情 /// </summary> public partial class cms_content { /// <summary> /// 栏目名称 /// </summary> public string channelName { get; set; } /// <summary> /// 用户显示名 /// </summary> public string showName { get; set; } /// <summary> /// 审核状态 /// </summary> public string dispAudit { get { switch (this.audit ?? 0) { case 0: return "待审核"; case 1: return "审核通过"; case 2: return "审核不通过"; } return "error"; } set { } } /// <summary> /// 在当前页中的索引 /// </summary> public int curPageSort { get; set; } /// <summary> /// 是否为空，模板使用，0不为空1为空 /// </summary> public int isNull { get; set; } }}
如何使用：
说明：支持参数化的增删改查，推荐使用参数化的增删改查；非参数化的增删改查过滤了部分数据库关键字以防止SQL注入，但可能仍然不安全。下面例子中的添加、修改、根据ID删除、根据ID集合批量删除都是参数化的，示例中的查询和其它方式的删除不是参数化的，DBHelper提供了相关的参数化查询和执行SQL。
添加：
/// <summary>/// 添加/// </summary>public void Insert(object obj){ DBHelper.Insert(obj);}
说明：SQL Server数据库可以使用自增，Oracle数据库可以使用Sequence，小系统可以使用DBHelper自带的GetMaxID方法。
获取最大ID(当然，ID一般采用自增，对于并发量极少的系统，或单机系统，为了省事，可以这样做)：
/// <summary>/// GetMaxId/// </summary>public int GetMaxId(){ return DBHelper.GetMaxID<BS_Template>("id");}
修改：
/// <summary>/// 修改/// </summary>public void Update(object obj){ DBHelper.Update(obj);}
删除：
根据ID删除：
/// <summary>/// 删除/// </summary>public void Del(int id){ DBHelper.Delete<BS_Template>(id);}
根据ID集合批量删除：
/// <summary>/// 删除/// </summary>public void BatchDelete(string ids){ DBHelper.BatchDelete<BS_Template>(ids);}
根据条件删除：
/// <summary>/// 删除/// </summary>public void Delete(string conditions){ DBHelper.Delete<BS_Template>(conditions);}
其它方式的删除请使用：
public static int ExecuteSql(string sqlString)
根据ID查询实体：
public cms_content Get(int id){ return DBHelper.FindById<cms_content>(id.ToString());}
查询：
public List<cms_content> GetListAll(){ StringBuilder sql = new StringBuilder(string.Format(@" select content.*, channel.title as channelName, user.showName from cms_content content left join cms_channel channel on channel.id=content.channelId left join CMS_sys_user user on user.id=content.publishUserId where content.audit=1 order by publishTime desc,id desc")); return DBHelper.FindListBySql<cms_content>(sql.ToString());}
说明：ExtModels下的扩展Model，可以支持查询数据库中不存在的字段，并映射填充到实体类。
分页查询：
public List<cms_content> GetList(ref PagerModel pager, int channelId, string title, int audit){ StringBuilder sql = new StringBuilder(string.Format(@" select content.*, channel.title as channelName, user.showName from cms_content content left join cms_channel channel on channel.id=content.channelId left join CMS_sys_user user on user.id=content.publishUserId where 1=1 ")); if (channelId != -1) { sql.AppendFormat(" and content.channelId = {0}", channelId); } if (!string.IsNullOrWhiteSpace(title)) { sql.AppendFormat(" and content.title like ‘%{0}%‘", title); } if (audit != -1) { sql.AppendFormat(" and content.audit = {0}", audit); } string orderby = string.Format("order by content.publishTime desc,id desc"); pager = DBHelper.FindPageBySql<cms_content>(sql.ToString(), orderby, pager.rows, pager.page); return pager.result as List<cms_content>;}
数据库事务：
try{ DBHelper.BeginTransaction(); //开启数据库事务 //在这里写增删改操作 DBHelper.CommitTransaction(); //提交数据库事务}catch(Exception ex){ DBHelper.RollbackTransaction(); //回滚数据库事务}
DAL层增删改查示例：
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Text.RegularExpressions;using DBUtil;using Models;namespace DAL{ /// <summary> /// 内容详情管理 /// </summary> public class ContentDal { #region 获取列表 /// <summary> /// 获取列表 /// </summary> public List<cms_content> GetList(ref PagerModel pager, int channelId, string title, int audit) { StringBuilder sql = new StringBuilder(string.Format(@" select content.*, channel.title as channelName, user.showName from cms_content content left join cms_channel channel on channel.id=content.channelId left join CMS_sys_user user on user.id=content.publishUserId where 1=1 ")); if (channelId != -1) { sql.AppendFormat(" and content.channelId = {0}", channelId); } if (!string.IsNullOrWhiteSpace(title)) { sql.AppendFormat(" and content.title like ‘%{0}%‘", title); } if (audit != -1) { sql.AppendFormat(" and content.audit = {0}", audit); } string orderby = string.Format("order by content.publishTime desc,id desc"); pager = DBHelper.FindPageBySql<cms_content>(sql.ToString(), orderby, pager.rows, pager.page); return pager.result as List<cms_content>; } #endregion #region 获取列表 /// <summary> /// 获取列表 /// </summary> /// <param name="pager">分页</param> /// <param name="channel">栏目，可以是栏目ID或栏目名称</param> /// <param name="where">where语句</param> public List<cms_content> GetList(ref PagerModel pager, string channel, string where) { StringBuilder sql = new StringBuilder(string.Format(@" select content.*, channel.title as channelName, user.showName from cms_content content left join cms_channel channel on channel.id=content.channelId left join CMS_sys_user user on user.id=content.publishUserId where content.audit=1 ")); if (!string.IsNullOrWhiteSpace(where)) { sql.AppendFormat(" and {0}", where); } if (!string.IsNullOrWhiteSpace(channel)) { ChannelDal channelDal = new ChannelDal(); if (Regex.IsMatch(channel, @"^\d+$")) //数字，即栏目ID { string channelIds = channelDal.GetChildIds(Convert.ToInt32(channel)); sql.AppendFormat(" and channelId in ({0})", channelIds); } else //非数字，即栏目名称 { string channelIds = channelDal.GetChildIds(channel); sql.AppendFormat(" and channelId in ({0})", channelIds); } } string orderby = string.Format("order by publishTime desc,id desc"); if (pager.rows > 0) { PagerModel pagerModel = DBHelper.FindPageBySql<cms_content>(sql.ToString(), orderby, pager.rows, pager.page); pager.totalRows = pagerModel.totalRows; pager.result = pagerModel.result; List<cms_content> list = pagerModel.result as List<cms_content>; int i = 1; list.ForEach(a => { a.curPageSort = i++; }); return pagerModel.result as List<cms_content>; } else { return DBHelper.FindListBySql<cms_content>(sql.ToString() + orderby); } } #endregion #region 获取列表 /// <summary> /// 获取列表 /// </summary> public List<cms_content> GetListAll() { StringBuilder sql = new StringBuilder(string.Format(@" select content.*, channel.title as channelName, user.showName from cms_content content left join cms_channel channel on channel.id=content.channelId left join CMS_sys_user user on user.id=content.publishUserId where content.audit=1 order by publishTime desc,id desc")); return DBHelper.FindListBySql<cms_content>(sql.ToString()); } #endregion #region 获取总数 /// <summary> /// 获取总数 /// </summary> public int GetAllCount() { StringBuilder sql = new StringBuilder(string.Format(@" select count(*) from cms_content content where content.audit=1")); return Convert.ToInt32(DBHelper.GetSingle(sql.ToString())); } #endregion #region 获取 /// <summary> /// 获取 /// </summary> public cms_content Get(int id) { return DBHelper.FindById<cms_content>(id.ToString()); } /// <summary> /// 根据channelId获取一条内容详情 /// </summary> public cms_content GetByChannelId(int channelId) { return DBHelper.FindBySql<cms_content>(string.Format("select * from cms_content where channelId={0} and audit=1", channelId)); } /// <summary> /// 获取 /// </summary> public cms_content GetNext(int id) { cms_content current = Get(id); return DBHelper.FindBySql<cms_content>(string.Format("select * from cms_content where id<{0} and channelId={1} and audit=1 order by id desc limit 0,1", current.id, current.channelId)); } /// <summary> /// 获取 /// </summary> public cms_content GetPre(int id) { cms_content current = Get(id); return DBHelper.FindBySql<cms_content>(string.Format("select * from cms_content where id>{0} and channelId={1} and audit=1 order by id asc limit 0,1", current.id, current.channelId)); } #endregion #region 添加 /// <summary> /// 添加 /// </summary> public void Insert(cms_content model) { model.id = DBHelper.GetMaxID<cms_content>("id"); DBHelper.Insert(model); } #endregion #region 修改 /// <summary> /// 修改 /// </summary> public void Update(cms_content model) { DBHelper.Update(model); } #endregion #region 删除 /// <summary> /// 删除 /// </summary> public void Del(string ids) { DBHelper.BatchDelete<cms_content>(ids); } #endregion }}
例子代码下载：http://files.cnblogs.com/files/s0611163/DBHelperDemo.zip
说明：例子程序是Winform，该DBHelper也适用于Web项目。
配套Model生成器下载：http://files.cnblogs.com/files/s0611163/Model%E7%94%9F%E6%88%90%E5%99%A8.zip
如果您不明白我为什么要写DBHelper，为什么没有语法糖，为什么查询和分页查询要使用原生SQL，看看下面我们ERP项目中的代码，你会明白，当然，这个项目设计的确实不好：
1、
/// <summary>/// 统计SQL/// </summary>public override string GetReportSql(string formData){ ProductInvoiceModel search = JsonConvert.DeserializeObject<ProductInvoiceModel>(formData); StringBuilder sql = new StringBuilder(string.Format(@" select * from (select distinct ‘出库单‘ as ‘报表类型‘, pos.billNo as ‘单据编号‘, pos.projectCode as ‘项目编号‘, pro.projectName as ‘项目名称‘, ma.subProject as ‘项目子项‘, case when cs.conMemberCode is not NULL then cs.conMemberCode else mat.materialCode end as ‘构件编码‘, case when cmd.memberName is not NULL then cmd.memberName else mat.materialName end as ‘材料名称‘, case when cs.conMemberCode is not NULL then ‘构件‘ else ‘物料‘ end as ‘类型‘, mad.model as ‘规格型号‘, dic1.dicItem as ‘单位‘, posd.qty as ‘数量‘, CONVERT(varchar(100), pos.billDate, 23) as ‘日期‘ from Pro_ProductOutStorageDet posd left join Pro_ProductOutStorage pos on pos.id=posd.parentId left join Pro_MatAllotDet mad on posd.matAllotDetId=mad.id left join Pro_MatAllot ma on ma.id=mad.parentID and ma.status=2 left join Pro_MatStock ms on ms.id=mad.matStockId and mad.memberType=1 left join Pro_ConStock cs on cs.id=mad.matStockId and mad.memberType=0 left join sys_material mat on mat.materialCode=ms.materailCode left join Pro_ProductInstorage pi on pi.billNo=cs.billNo left join Pro_ProductInstorageDet pid on pid.parentId=pi.id left join Pro_ConMember cm on cm.billCode=pi.conMemberBillNo left join Pro_ConMemberDet cmd on cmd.id=pid.conMemberDetId left join Pro_Info pro on pos.projectCode=pro.projectNum left join sys_dicDetail dic1 on dic1.dicItemcode=mad.unitCode union all select distinct ‘XXX出库单‘ as ‘报表类型‘, pos.billNo as ‘单据编号‘, pos.projectCode as ‘项目编号‘, pro.projectName as ‘项目名称‘, ‘‘ as ‘项目子项‘, case when cs.conMemberCode is not NULL then cs.conMemberCode else mat.materialCode end as ‘构件编码‘, case when cmd.memberName is not NULL then cmd.memberName else mat.materialName end as ‘材料名称‘, case when cs.conMemberCode is not NULL then ‘构件‘ else ‘物料‘ end as ‘类型‘, case when cmd.model is not NULL then cmd.model else mat.model end as ‘规格型号‘, case when dic1.dicItem is not NULL then dic1.dicItem else dic2.dicItem end as ‘单位‘, posd.qty as ‘数量‘, CONVERT(varchar(100), pos.billDate, 23) as ‘日期‘ from Pro_ProductOut2StorageDet posd left join Pro_ProductOut2Storage pos on pos.id=posd.parentId left join Pro_MatStock ms on ms.id=posd.matStockId left join Pro_ConStock cs on cs.id=posd.conInventoryDetId left join sys_material mat on mat.materialCode=ms.materailCode left join Pro_ProductInstorage pi on pi.billNo=cs.billNo left join Pro_ProductInstorageDet pid on pid.parentId=pi.id left join Pro_ConMember cm on cm.billCode=pi.conMemberBillNo left join Pro_ConMemberDet cmd on cmd.id=pid.conMemberDetId left join Pro_Info pro on pos.projectCode=pro.projectNum left join sys_dicDetail dic1 on dic1.dicItemcode=mat.unitCode left join sys_dicDetail dic2 on dic2.dicItemcode=cmd.qtyUnit union all select distinct ‘生产消耗单‘ as ‘报表类型‘, pc.billCode as ‘单据编号‘, pro.projectNum as ‘项目编号‘, pro.projectName as ‘项目名称‘, ll.subProject as ‘项目子项‘, case when cs.conMemberCode is not NULL then cs.conMemberCode else mat.materialCode end as ‘构件编码‘, case when cmd.memberName is not NULL then cmd.memberName else mat.materialName end as ‘材料名称‘, case when cs.conMemberCode is not NULL then ‘构件‘ else ‘物料‘ end as ‘类型‘, case when cmd.model is not NULL then cmd.model else mat.model end as ‘规格型号‘, case when dic1.dicItem is not NULL then dic1.dicItem else dic2.dicItem end as ‘单位‘, pcd.consumeQty as ‘数量‘, CONVERT(varchar(100), pc.billDate, 23) as ‘日期‘ from Pro_ProductConsume pc left join Pro_ProductConsumeDet pcd on pcd.parentId=pc.id left join Pro_LingLiaoDet lld on lld.id=pcd.lingLiaoDetId left join Pro_LingLiao ll on ll.id=lld.parentId left join Pro_MatStock ms on ms.id=lld.matStockId and lld.memberType=1 left join Pro_ConStock cs on cs.id=lld.matStockId and lld.memberType=0 left join sys_material mat on mat.materialCode=ms.materailCode left join Pro_ProductInstorage pi on pi.billNo=cs.billNo left join Pro_ProductInstorageDet pid on pid.parentId=pi.id left join Pro_ConMember cm on cm.billCode=pi.conMemberBillNo left join Pro_ConMemberDet cmd on cmd.id=pid.conMemberDetId left join Pro_ProTask pt on pt.billCode=ll.proTaskCode left join Pro_Info pro on pt.proInfCode=pro.billCode left join sys_dicDetail dic1 on dic1.dicItemcode=mat.unitCode left join sys_dicDetail dic2 on dic2.dicItemcode=cmd.qtyUnit ) T where 1=1 ")); if (!string.IsNullOrEmpty(search.projectName)) { sql.AppendFormat(" and T.项目名称 like ‘%{0}%‘ ", search.projectName.Trim()); } if (!string.IsNullOrEmpty(search.projectCode)) { sql.AppendFormat(" and T.项目编号 like ‘%{0}%‘ ", search.projectCode.Trim()); } if (!string.IsNullOrEmpty(search.btime) && !string.IsNullOrEmpty(search.etime)) { sql.AppendFormat(" and T.日期 >= ‘{0}‘", search.btime); } if (!string.IsNullOrEmpty(search.etime)) { sql.AppendFormat(" and T.日期 <= ‘{0}‘", search.etime); } return sql.ToString();}
说明：查询SQL书写规范：SQL不能写的乱七八糟，该换行换行，该对齐对齐。
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public List<MatAllotModel> GeProMatAllotList(ref PagerModel pager, string billCode, string projectNum, string projectName, string remarks, int status) { string sql = @"select v.*,ISNULL(v.IsFinish,(case when ISNULL(v.pqty,0)= ISNULL(v.mqty,0) then 1 else 0 end)) as IsEnd from (select ma.*,e.name + ‘(‘+isnull(e.mobilephone,‘‘)+‘)‘ as billCreatorName,i.projectName,s.storeHouseName as inStoreName, (select stuff((select distinct ‘,‘+s.storeHouseName from Pro_MatAllotDet madjoin sys_storehouse s on mad.outStorageCode=s.storeHouseCodewhere parentId =ma.id for xml path(‘‘)),1,1,‘‘)) as outStoreName,I.projectSim,D.dicItem AS typename,ppi.id as InvoiceId,i.projectNum,(select sum(md.qty) from Pro_MatAllotDet md where md.parentId =ma.id) as mqty,(select sum(qty) from Pro_ProductOutStorageDet pod left join Pro_ProductOutStorage po on po.id = pod.parentIDwhere po.matAllotBillCode = ma.billCode) as pqtyfrom Pro_MatAllot majoin sys_storehouse s on ma.inStoreCode=s.storeHouseCodejoin sys_employee e on ma.billCreator=e.employeeCodeleft join Pro_ProductInvoice ppi on ppi.MatAllotBillCode=ma.billCodeleft join Pro_Info i on ma.projectCode = i.projectNumLEFT JOIN sys_dicDetail D ON D.dicItemcode = I.projectType) as v where 1=1 "; if (!string.IsNullOrEmpty(billCode)) { sql += " and v.billCode like ‘%" + billCode.Trim() + "%‘"; } if (!string.IsNullOrEmpty(projectName)) { sql += " and v.projectName like ‘%" + projectName.Trim() + "%‘"; } if (!string.IsNullOrEmpty(projectNum)) { sql += " and v.projectNum like ‘%" + projectNum.Trim() + "%‘"; } if (!string.IsNullOrEmpty(remarks)) { sql += " and v.remarks like ‘%" + remarks.Trim() + "%‘"; } sql += " and v.status=" + status + ""; List<MatAllotModel> matAllot = EntityHelper.Default.GetPageEntities<MatAllotModel>(pager.page, pager.rows, sql, "id", pager.sort, pager.order); pager.totalRows = DBHelper.Default.Count(sql); pager.result = matAllot; return matAllot; }
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public static List<ConStockDialogMod> GetMaterialData(ref PagerModel pager, string memberName, string storeCode, string parentId, string store){ StringBuilder where = new StringBuilder(" and 1=1 "); if (!string.IsNullOrEmpty(memberName)) //当物料为空时，查询出所有的结果集，否则查询出此种相似物料的结果集 where.AppendFormat(" and t3.memberName like ‘%{0}%‘ ", memberName.Trim()); if (!string.IsNullOrEmpty(storeCode)) //当物料为空时，查询出所有的结果集，否则查询出此种相似物料的结果集 where.AppendFormat(" and SSH.storeHouseCode=‘{0}‘ ", storeCode); if (!string.IsNullOrEmpty(parentId)) //当物料为空时，查询出所有的结果集，否则查询出此种相似物料的结果集 where.AppendFormat(" and t3.parentId = {0} ", parentId); if (!string.IsNullOrEmpty(store)) where.AppendFormat(" and SSH.storeHouseName like ‘%{0}%‘ ", store.Trim()); string sql = @"SELECT PM.id,PM.conMemberCode as conMemberCode,PM.price,(PM.qty-PM.lockQty-PM.usedQty) AS stockNum, PM.instoreTime,PM.billNo,PM.storeCode,PM.lockQty,PM.usedQty,SSH.storeHouseName AS storeName, t3.allWeight,t3.qtyUnit,t3.weight as weights,t3.memberName,t3.model,t3.qulity, d1.dicItem as allWeightUnitName,d2.dicItem as qtyUnitName, d3.dicItem as qulityName,d4.dicItem as weightUnitName, (select SUM(pt.qty) from Pro_ProductOutstorageDet pt where pt.conInventoryDetId=PM.id)as outQty from Pro_ConStock PM join Pro_ConPurInstore cpd on PM.billNo=cpd.billCode join Pro_ConPurInstoreDet cp on cpd.id=cp.parentId and PM.billId=cp.id join dbo.Pro_ConGoodsDet t on t.id=cp.conGoodsDetId join dbo.Pro_ConPurchaseContractDet t1 on t1.id=t.conContractDetId join dbo.Pro_ConPurchasePlanDet t2 on t2.id=t1.conPlanDetID join dbo.Pro_ConMemberDet t3 on t3.id=t2.conMemberDetId left join sys_storehouse SSH on SSH.storeHouseCode=PM.storeCode left join sys_dicDetail d1 on d1.dicItemcode=t3.allWeightUnit left join sys_dicDetail d2 on d2.dicItemcode=t3.qtyUnit left join sys_dicDetail d3 on d3.dicItemcode=t3.qulity left join sys_dicDetail d4 on d4.dicItemcode=t3.weightUnit WHERE PM.qty-PM.lockQty-PM.usedQty > 0 " + where + @" union SELECT PM.id,PM.conMemberCode as conMemberCode,PM.price,(PM.qty-PM.lockQty-PM.usedQty) AS stockNum, PM.instoreTime,PM.billNo,PM.storeCode,PM.lockQty,PM.usedQty, SSH.storeHouseName AS storeName, t3.allWeight,t3.qtyUnit,t3.weight as weights,t3.memberName,t3.model,t3.qulity, d1.dicItem as allWeightUnitName,d2.dicItem as qtyUnitName, d3.dicItem as qulityName,d4.dicItem as weightUnitName, (select SUM(pt.qty) from Pro_ProductOutstorageDet pt where pt.conInventoryDetId=PM.id)as outQty from Pro_ConStock PM join Pro_ProductInstorage cpd on PM.billNo=cpd.billNo join Pro_ProductInstorageDet cp on cpd.id=cp.parentId and PM.billId=cp.id join dbo.Pro_ConMemberDet t3 on t3.id=cp.conMemberDetId left join sys_storehouse SSH on SSH.storeHouseCode=PM.storeCode left join sys_dicDetail d1 on d1.dicItemcode=t3.allWeightUnit left join sys_dicDetail d2 on d2.dicItemcode=t3.qtyUnit left join sys_dicDetail d3 on d3.dicItemcode=t3.qulity left join sys_dicDetail d4 on d4.dicItemcode=t3.weightUnit WHERE PM.qty-PM.lockQty-PM.usedQty > 0 " + where; List<ConStockDialogMod> model = EntityHelper.Default.GetPageEntities<ConStockDialogMod>(pager.page, pager.rows, sql.ToString(), "id", pager.sort, pager.order); pager.totalRows = DBHelper.Default.Count(sql.ToString()); pager.result = model; return model;}
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/// <summary> /// Sql /// </summary> /// <param name="formData"></param> /// <returns></returns> public override string GetReportSql(string formData) { TaskAllocationModel search = JsonConvert.DeserializeObject<TaskAllocationModel>(formData); StringBuilder where = new StringBuilder(" where 1=1 "); if (!string.IsNullOrEmpty(search.projectCode)) { where.AppendFormat(" and ta.projectCode like ‘%{0}%‘ ", search.projectCode.Trim()); } if (!string.IsNullOrEmpty(search.projectName)) { where.AppendFormat(" and pro.projectName like ‘%{0}%‘ ", search.projectName.Trim()); } string sql = @"select ta.billCode as ‘单号‘,pro.projectName as ‘项目名称‘,pro.projectNum as ‘项目编号‘,ta.desingBillCode as ‘项目设计任务单‘, CASE ta.violent WHEN ‘1‘ THEN ‘是‘ ELSE ‘否‘ END as ‘是否加急‘, CASE ta.taskType WHEN ‘0‘ THEN ‘载荷图‘ WHEN ‘1‘ THEN ‘方案图‘ WHEN ‘2‘ THEN ‘工程量统计‘ ELSE ‘载荷图与工程量统计‘ END as ‘任务类型‘,ta.desingContent as ‘设计内容‘,ta.auditorScore as ‘审核人打分‘,(select e.RealNamefrom Wf2Operate oper left join Wf2Node n on n.id = oper.Wf2NoteID left join employee e on e.employeecode = oper.Operator where Wf2InstanceID = ta.LastWf2InstanceID and n.Name=‘设计‘ and oper.OperationID != -3) as ‘设计者‘,(select e.RealNamefrom Wf2Operate oper left join Wf2Node n on n.id = oper.Wf2NoteID left join employee e on e.employeecode = oper.Operator where Wf2InstanceID = ta.LastWf2InstanceID and n.Name=‘校对‘ and oper.OperationID != -3) as ‘校对者‘,(select e.RealNamefrom Wf2Operate oper left join Wf2Node n on n.id = oper.Wf2NoteID left join employee e on e.employeecode = oper.Operator where Wf2InstanceID = ta.LastWf2InstanceID and n.Name=‘审核‘ and oper.OperationID != -3) as ‘审核者‘,(select e.RealNamefrom Wf2Operate oper left join Wf2Node n on n.id = oper.Wf2NoteID left join employee e on e.employeecode = oper.Operator where Wf2InstanceID = ta.LastWf2InstanceID and n.Name=‘审定‘ and oper.OperationID != -3) as ‘审定者‘,e.name as ‘创建人‘,ta.creatTime as ‘创建时间‘from Pro_TaskAllocation taleft join Pro_Info pro on ta.projectCode=pro.projectNumleft join sys_employee e on ta.creator=e.employeeCode " + where; return sql.ToString(); }
C#/ASP.NET完善的DBHelper，配套Model生成器
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