数据库开发个人总结(ADO.NET小结)

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);
 

2.建立SqlCommand与SqlConnection的关联。

myCommand.Connection = myConnection;

或者：SqlCommand myCommand = myConnection.CreateCommand;

3．设置SqlCommand的查询文本。

myCommand.CommandText = "SELECT * FROM mindata";

或者第2种构造：SqlCommand myCommand = new SqlCommand(mySelectQuery);

给SqlCommand对象提供两个查询字符串，每个查询字符串访问不同的表，返回不同的结果集。

两个查询语句用分号分隔。

4. 执行命令。

ExecuteReader

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