//创建datatableDataTable dt = new DataTable("个人简历");            dt.Columns.Add("id", typeof(int));            dt.Columns.Add("name", typeof(string));            dt.Columns.Add("sex", typeof(int));            dt.Columns.Add("address", typeof(string));            dt.Columns.Add("aihao", typeof(string));            dt.Columns.Add("photo", typeof(string));            dt.Rows.Add(new object[] { 1, "张三", 1, "东大街6号", "看书", "" });            dt.Rows.Add(new object[] { 1, "王五", 0, "西大街2号", "上网,游戏", "" });            dt.Rows.Add(new object[] { 1, "李四", 1, "南大街3号", "上网,逛街", "" });            dt.Rows.Add(new object[] { 1, "钱八", 0, "北大街5号", "上网,逛街,看书,游戏", "" });            dt.Rows.Add(new object[] { 1, "赵九", 1, "中大街1号", "看书,逛街,游戏", "" });                        //查询(getDatas)public static DataSet getDatas(string tableName,string strCondition){    string sql = "select * from "+tableName+" where 1=1 "+strCondition;    DB.DataHelper dtHelper = new DB.DataHelper();        return dtHelper.ExecuteSql(sql);  }//获取(getItems)public static DataSet getItems(string code,string describe,string tableName,string strCondition){    string sql = "select distinct "+code+" as code ,"+describe+" as describe  from "+tableName+" where 1=1 "+strCondition;    DB.DataHelper dtHelper = new DB.DataHelper();        return dtHelper.ExecuteSql(sql);  }//新增多行(insertDatas)public static int insertDatas(DataTable dt){        if(dt ==null || dt.Rows.Count<=0)        return 0;        string tableName = dt.TableName;        ArrayList sqlList = new ArrayList();        string sql ="";        string sql1="";        string sql2="";        foreach(DataRow row in dt.Rows) ////遍历行拼sql语句        {            sql = "insert into "+tableName+"(";            sql1 ="";            sql2 ="";            for(int i =0;i<dt.Columns.Count;i++)            {                sql1=sql1+dt.Columns[i].ColumnName.ToString()+",";                sql2=sql2+"‘"+row[i].ToString()+"‘,";                }                sql = sql +sql1.Substring(0, sql1.Length - 1)+") values("+sql2.Substring(0, sql2.Length - 1)+ ")";            sqlList.Add(sql);        }        DB.DataHelper dtHelper = new DB.DataHelper();        dtHelper.ExecuteSqlTran(sqlList);         return 1;}//修改多行(updateDatas)public static int updateDatas(DataTable dt){        if(dt ==null || dt.Rows.Count<=0)        return 0;        string tableName = dt.TableName;        string pk = dt.Columns[0].ColumnName.ToString(); //获取第一列名（主键列）    string pkValue = http://www.mamicode.com/row[0].ToString(); //获取第一行的（主键值）        ArrayList sqlList = new ArrayList();        string sql ="";        string sql1="";        foreach (DataRow row in dt.Rows) //遍历行        {            sql = "update " + tableName + " set ";                for (int i = 1; i < dt.Columns.Count; i++) //从1开始，因为第一列为主键值            {                sql1 = sql1 + dt.Columns[i].ColumnName + "= ‘" + row[i].ToString() + "‘,";//列名+列值                }            sql = sql + sql1.Substring(0, sql1.Length - 1) + " where " + pk + " = ‘" + pkValue + "‘";            sqlList.Add(sql);        }        DB.DataHelper dtHelper = new DB.DataHelper();        dtHelper.ExecuteSqlTran(sqlList);         return 1;}//删除单条，返回影响条数(deleteData)public static int deleteData(string tableName,string strCondition){    string sql = "delete from "+tableName+" where 1=1 "+strCondition;    DB.DataHelper dtHelper = new DB.DataHelper();        return dtHelper.ExecuteSql(sql);   }//删除多条(deleteDatas)public static int deleteDatas(DataTable dt){        if(dt == null||dt.Rows.Count<=0)            return 0;        string tableName = dt.TableName;        ArrayList sqlList = new ArrayList();        string sql = "";        foreach(DataRow row in dt.Rows)        {            string pk = dt.Columns[0].ColumnName.ToString(); //获取第一列名（主键列）      string pkValue = http://www.mamicode.com/row[0].ToString(); //获取第一行的（主键值）            sql="delete from "+tableName+" where "+pk+" = ‘"+pkValue+"‘";            sqlList.Add(sql);        }        DB.DataHelper dtHelper = new DB.DataHelper();        dtHelper.ExecuteSqlTran(sqlList);         return 1;}//多步操作使用数组接受参数(multiStep)public static int multilStep(DataTable dt){    string[] arr = new string[dt.Columns.Count];    foreach(DataRow row in dt.Rows)    {        for (int i = 0; i < dt.Columns.Count; i++)            {                arr[i]=row[i].ToString();            }        }        //参数1arr[0]    //参数2arr[1]    //参数3arr[2]    ...    string sql1="";    string sql2="";    string sql3="";    ArrayList sqlList = new ArrayList();    sqlList.Add(sql1);    sqlList.Add(sql2);    sqlList.Add(sql2);3.    DB.DataHelper dtHelper = new DB.DataHelper();    dtHelper.ExecuteSqlTran(sqlList);     return 1;}