SQL通過Datatable更新數據庫表內容

//要注意的一點是在Select語句中要選擇的列中必須包含主鍵的列,此外不支持多表連接查詢

 DataTable dt = new DataTable();
using (SqlConnection sqlConn = new SqlConnection("********"))
            {
//先取出從數據庫中取出Datatable
                SqlCommand sqlcmd = new SqlCommand("select * from ExecuteReservation", sqlConn);
                sqlConn.Open();
                SqlDataReader sqlReader = null;
                sqlReader = sqlcmd.ExecuteReader();
                dt.Load(sqlReader);

//修改一條記錄
                dt.Rows[0]["VersionInfo"] = "5.0";

//以下三行代碼就是把上面更改的數據更新到數據庫中
                SqlDataAdapter sda = new SqlDataAdapter(sqlcmd);
                SqlCommandBuilder sqlcmdB = new SqlCommandBuilder(sda);
                sda.Update(dt);
            }

//以上如果不使用SQL語句的話，也可以使用存儲過程，修改成以下代碼即可

SqlCommand sqlcmd = new SqlCommand("對應的存儲過程名", sqlConn);
sqlcmd.CommandType = CommandType.StoredProcedure;

 

//查詢出來的DataTable是連接表的集合，更新的時候可以使用UpdateCommand來完成，代碼如下

//存儲過程如下

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";

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

//隨便新建一個Datatable，將數據更新到指定的表中會需要設置InsertCommand，否則會報“Update requires a valid InsertCommand when passed DataRow collection with new rows.”

sda.InsertCommand = newcmd;

sda.Update(dt);