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  • SQL通过Datatable更新数据库表内容

    SQL通过Datatable更新数据库表内容

     
    复制代码
    //要注意的一点是在Select语句中要选择的列中必须包含主键的列,此外不支持多表连接查询
     DataTable dt = new DataTable();
    using (SqlConnection sqlConn = new SqlConnection("********"))
    {
    //先取出从数据库中取出Datatable
    SqlCommand sqlcmd = new SqlCommand("select * from ExecuteReservation", sqlConn);
    sqlConn.Open();
    SqlDataReader sqlReader = null;
    sqlReader = sqlcmd.ExecuteReader();
    dt.Load(sqlReader);

    //修改一条记录
    dt.Rows[0]["VersionInfo"] = "5.0";

    //以下三行代码就是把上面更改的数据更新到数据库中
    SqlDataAdapter sda = new SqlDataAdapter(sqlcmd);
    SqlCommandBuilder sqlcmdB = new SqlCommandBuilder(sda);
    sda.Update(dt);
    }
    //以上如果不使用SQL语句的话,也可以使用存储过程,修改成以下代码即可

    SqlCommand sqlcmd = new SqlCommand("对应的存储过程名", sqlConn);
    sqlcmd.CommandType = CommandType.StoredProcedure;

    //查询出来的DataTable是连接表的集合,更新的时候可以使用UpdateCommand来完成,代码如下

    //存储过程如下

    ALTER PROCEDURE [dbo].[SelectExe]
    @versioninfo nvarchar(50),
    @ID int
    AS
    BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;
    update dbo.ExecuteReservation set versioninfo=@versioninfo where ID=@ID
    END

    ————————————————————————————————————————————————————————————————————

    SqlCommand newCmd = new SqlCommand("SelectExe", sqlConn);
    newCmd.CommandType = CommandType.StoredProcedure;
    newCmd.Parameters.Add(new SqlParameter("@VersionInfo", SqlDbType.VarChar));
    newCmd.Parameters[0].SourceColumn = "VersionInfo";

    newCmd.Parameters.Add(new SqlParameter("@ID", SqlDbType.Int));
    newCmd.Parameters[1].SourceColumn = "ID";

    //修改记录
    dt.Rows[0]["VersionInfo"] = "45";
    dt.Rows[1]["VersionInfo"] = "56";
     
    SqlDataAdapter sda = new SqlDataAdapter( );
    sda.UpdateCommand = newCmd;

    //随便新建一个Datatable,将数据更新到指定的表中会需要设置InsertCommand,否则会报“Update requires a valid InsertCommand when passed DataRow collection with new rows.”

    sda.InsertCommand = newcmd;

    sda.Update(dt);

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  • 原文地址:https://www.cnblogs.com/wfy680/p/12088984.html
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