SQL通过Datatable更新数据库表内容

//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

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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);