C# ADO.NET操作数据代码汇总

C# ADO.NET操作数据代码汇总2011-07-10一．用SqlConnection连接SQL Server

1..加入命名空间

using System.Data.SqlClient;

2.连接数据库

SqlConnection myConnection = new SqlConnection（）;

myConnection.ConnectionString = "user id=sa;password=sinofindb;initial catalog=test;data source=127.0.0.1;Connect Timeout=30";

myConnection.Open（）;

改进（更通用）的方法：

string MySqlConnection="user id=sa;password=sinofindb;Database =test;data source=127.0.0.1;Connect Timeout=30";

SqlConnection myConnection = new SqlConnection（MySqlConnection）;

myConnection.Open（）;

二、用OleDbConnection连接

1.加入命名空间

using System.Data.OleDb;

2.连接sql server

string MySqlConnection="Provider=SQLOLEDB;Data Source=localhost;Initial Catalog=test;Integrated Security=SSPI;";

SqlConnection myConnection = new SqlConnection（MySqlConnection）;

myConnection.Open（）;

3.连接Access（可通过建立.udl文件获得字符串）

string MySqlConnection="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:db2000.mdb;

Persist Security Info=False;

4.连接Oracle（也可通过OracleConnection连接）

string MySqlConnection="Provider=MSDAORA;Data Source=db; user id=sa;password=sinofindb";

三.创建Command对象

1．SqlCommand 构造函数

①初始化 SqlCommand 类的新实例。public SqlCommand（）;

SqlCommand myCommand = new SqlCommand（）;

②初始化具有查询文本的 SqlCommand 类的新实例。public SqlCommand（string）;

String mySelectQuery = "SELECT * FROM mindata";

SqlCommand myCommand = new SqlCommand（mySelectQuery）;

③初始化具有查询文本和 SqlConnection 的SqlCommand类实例。

Public SqlCommand（string, SqlConnection）;

String mySelectQuery = "SELECT * FROM mindata";

string myConnectString = "user id=sa;password=;database=test;server=mySQLServer";

SqlConnection myConnection = new SqlConnection（myConnectString）;

SqlCommand myCommand = new SqlCommand（mySelectQuery,myConnection）;

④初始化具有查询文本、SqlConnection 和 Transaction 的 SqlCommand 类实例。

public SqlCommand（string, SqlConnection, SqlTransaction）;

SqlTransaction myTrans = myConnection.BeginTransaction（）;

String mySelectQuery = "SELECT * FROM mindata";

string myConnectString = "user id=sa;password=;database=test;server=mySQLServer";

SqlConnection myConnection = new SqlConnection（myConnectString）;

SqlCommand myCommand = new SqlCommand（mySelectQuery,myConnection, myTrans）;