方法一：在對SQL數據庫進行更新時，用CommandBuilder對像來自動構建sql命令，來起到更新的作用;這種方法用起來比較方便，具體代碼如下：

以下代碼都在xp系統下測試通過

環境：vs.net2005?\?sql?server?2000\xp
using?System;
using?System.Collections.Generic;
using?System.Text;
using?System.Data;
using?System.Data.SqlClient;

namespace?sqltest
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{

????????????string?sConnectonString;
????????????sConnectonString?=?"Password=sa;user?id?=?sa;Initial?Catalog?=?master;Data?Source=(local)";
????????????SqlConnection?objConn?=?new?SqlConnection(sConnectonString);
????????????objConn.Open();
???????????????????????
????????????SqlDataAdapter?daAuthors?=?new?SqlDataAdapter("select?*?from?city_users",?objConn);
????????????DataSet?dsMaster?=?new?DataSet("master");
????????????daAuthors.FillSchema(dsMaster,?SchemaType.Source,?"city_users");//加載表的構架，這樣在操作加載到dataset里的表時就不用重新設置主鍵了
????????????daAuthors.Fill(dsMaster,?"city_users");
????????????dsMaster.Tables["city_users"].Rows[1]["user_name"]?=?"sql";//注意這里的Rows[1]，這個1指得是在DataSet里的表里的行號，其與數據庫里的行號不一致如圖1
????????????
????????????SqlCommandBuilder?objCommandBuilder?=?new?SqlCommandBuilder(daAuthors);//構建sql命令
????????????daAuthors.Update(dsMaster,?"city_users");//更新
????????????//daAuthors.UpdateCommand?=?updatecomm;
????????????//daAuthors.UpdateCommand.ExecuteNonQuery();
????????????objConn.Close();
????????????Console.WriteLine("update?was?successful");
?????????
????????}
????}
}

圖1


方法二：手動添加sql語句，代碼如下：

using?System;
using?System.Collections.Generic;
using?System.Text;
using?System.Data;
using?System.Data.SqlClient;

namespace?sqltest
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{

????????????string?sConnectonString;
????????????sConnectonString?=?"Password=sa;user?id?=?sa;Initial?Catalog?=?master;Data?Source=(local)";
????????????SqlConnection?objConn?=?new?SqlConnection(sConnectonString);
????????????objConn.Open();
????????????SqlCommand?updatecomm?=?new?SqlCommand("update?city_users?set?user_name='mysql'?where?user_id?=?7",?objConn);?
????????????daAuthors.UpdateCommand?=?updatecomm;
????????????daAuthors.UpdateCommand.ExecuteNonQuery();
????????????objConn.Close();
????????????Console.WriteLine("update?was?successful");?
????????}
????}
}


為什么我要寫這一篇呢？原因是我在用MySql時，用的MySql驅動沒有CommandBuilder對像，不能自動構建sql命令，所以就有了這篇文章。

轉載于:https://www.cnblogs.com/sopper/archive/2007/01/05/612200.html

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