首页 > 代码库 > C#操作数据库
C#操作数据库
1 : App.config
<?xml version="1.0" encoding="utf-8" ?> <configuration> <connectionStrings> <add name="ConnLink" connectionString="server=‘localhost‘;database=‘ReportServer‘;UID= ‘sa‘;PassWord=‘123‘"></add> </connectionStrings> <startup> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" /> </startup> </configuration>
improtant :
<connectionStrings> <add name="ConnLink" connectionString="server=‘localhost‘;database=‘ReportServer‘;UID= ‘sa‘;PassWord=‘123‘"></add> </connectionStrings>
add Quote
code :
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Configuration; using System.Data.SqlClient; using System.Data; namespace SQLHandel.SQL { /// <summary> /// 注意此类 /// </summary> public class SqlConnectionDemo { private readonly string CONN_LINK = ConfigurationManager.ConnectionStrings["ConnLink"].ToString(); public SqlConnectionDemo() { //test Console.WriteLine("我得到的链接数据库的连接字符串 - > " + this.CONN_LINK); } /// <summary> /// 链接数据库 /// </summary> /// <returns>是否连接成功</returns> public bool ConnDB() { SqlConnection conn = new SqlConnection(this.CONN_LINK); bool connOK = false; try { conn.Open(); connOK = true; } catch (Exception e) { Console.WriteLine(e.Message); } finally { conn.Close(); } return connOK; } /// <summary> /// 使用SqlDataReader 来获取数据 /// </summary> public void getDataWithDataReader() { //注意 , 这一使用using , 确保conn对象的释放 using (SqlConnection conn = new SqlConnection(this.CONN_LINK)) { string sql = "select * from Users where UserType = @UserType"; SqlParameter spt1 = new SqlParameter("UserType", SqlDbType.Int); // 注意 : SqlDbType 引用 using System.Data; spt1.Value = 1;//占位赋值 SqlCommand scd = new SqlCommand(); scd.Connection = conn; scd.CommandText = sql; scd.Parameters.Add(spt1);//加入到Commend 中 // 注意打开数据库连接 conn.Open(); SqlDataReader dr = scd.ExecuteReader(); // 注 : SqlDataReader 没有构造函数 while (dr.Read())//Read() 相当于一个指针 , 每读一次向下移动以为 . { Console.WriteLine("我得到的数据 DataReader-------------------------"); Console.WriteLine("UserId : " + dr["UserId"].ToString()); Console.WriteLine("Sid : " + dr["Sid"].ToString()); Console.WriteLine("UserType : " + dr["UserType"].ToString()); Console.WriteLine("AuthType : " + dr["AuthType"].ToString()); Console.WriteLine("UserName : " + dr["UserName"].ToString()); } dr.Dispose(); scd.Dispose(); conn.Close(); } } /// <summary> /// 私用DataSet获得数据集(本人建议使用) /// </summary> public void getDataWithDataSet() { using (SqlConnection conn = new SqlConnection(this.CONN_LINK)) { string sql = "select * from Users where UserType = @UserType "; SqlDataAdapter sda = new SqlDataAdapter(); DataSet ds = new DataSet("Kayer"); // 虚拟库名 SqlCommand scd = new SqlCommand(); scd.CommandText = sql; scd.Connection = conn; SqlParameter spt1 = new SqlParameter("UserType", SqlDbType.Int); spt1.Value = 1; scd.Parameters.Add(spt1); sda.SelectCommand = scd; sda.Fill( ds, "users"); // 虚拟表名 // 对数据的解析 //第一种遍历的方式 //foreach (DataRow dr in ds.Tables["users"].Rows) //{ // //遍历列 // Console.WriteLine("我得到的数据 数据 DataSet ----------------------------------"); // foreach (DataColumn dc in ds.Tables["users"].Columns) // { // Console.WriteLine(" 列 : {0} , 数据 : {1} ", dc.ColumnName, dr[dc.ColumnName]); // } //} //第二种遍历的方式 for (int i = 0; i < ds.Tables["users"].Rows.Count; i += 1) { Console.WriteLine("我得到的数据 数据 DataSet ----------------------------------"); for (int j = 0; j < ds.Tables["users"].Columns.Count; j += 1) { Console.WriteLine(" 列 : {0} , 数据 : {1} ", ds.Tables["users"].Columns[j].ColumnName, ds.Tables["users"].Rows[i][j]); } } ds.Dispose(); sda.Dispose(); } } /// <summary> /// 运行无参存储过程 /// </summary> public void ProNoPramHandler() { using (SqlConnection conn = new SqlConnection(this.CONN_LINK)) { SqlCommand scd = new SqlCommand("ProNameNoParams", conn); scd.CommandType = CommandType.StoredProcedure; conn.Open(); scd.ExecuteNonQuery(); scd.Dispose(); conn.Dispose(); } } /// <summary> /// 运行有参存储过程 /// </summary> public void ProHaspramHander() { using (SqlConnection conn = new SqlConnection(this.CONN_LINK)) { SqlCommand scd = new SqlCommand(); scd.Connection = conn; scd.CommandText = "ProNameNoParams";//存储过程的名称 scd.CommandType = CommandType.StoredProcedure; SqlParameter spt = new SqlParameter("@ParameterName", SqlDbType.Int);//存储过程的参数 spt.Direction = ParameterDirection.Input; // 输入参数 spt.Value = 1;//赋值 scd.Parameters.Add(spt); conn.Open(); scd.ExecuteNonQuery(); scd.Dispose(); conn.Close(); conn.Dispose(); } } /// <summary> /// 运行有返回值存储过程 /// </summary> public void ProHasReturnHandler() { using (SqlConnection conn = new SqlConnection(this.CONN_LINK)) { SqlCommand scd = new SqlCommand(); scd.Connection = conn; scd.CommandText = "ProHasReturn"; scd.CommandType = CommandType.StoredProcedure; SqlParameter spt = new SqlParameter("@id", SqlDbType.Int); spt.Direction = ParameterDirection.Output;//存储过程返回参数设置 scd.Parameters.Add(spt); conn.Open(); scd.ExecuteNonQuery(); int returnfromPro = Convert.ToInt32(scd.Parameters["@id"].Value);//得到存储过程返回参数 scd.Dispose(); conn.Close(); } } } }
本文出自 “Better_Power_Wisdom” 博客,请务必保留此出处http://aonaufly.blog.51cto.com/3554853/1610533
C#操作数据库
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。