ado.net数据库操作（2）

5.1使用SQLDataReader进行数据库查询

<%@ Import Namespace="System.Data" %>
 <%@ Import NameSpace="System.Data.SqlClient" %>

 <%
 Dim myConnection As SqlConnection
 Dim myCommand As SqlCommand
 Dim myDataReader As SqlDataReader

 myConnection = New SqlConnection( "server=localhost;uid=sa;database=Pubs" )
 myConnection.Open()
 myCommand = New SqlCommand( "Select * from Authors", myConnection )
 myDataReader = myCommand.ExecuteReader()
 While myDataReader.Read()
  Response.Write( myDataReader.Item( "au_lname" ) )
 End While
 myDataReader.Close()
 myConnection.Close()
 %>

5.2在C#中使用SqlDataReader 进行数据库查询

<%@ Page Language="C#" %>


  <%@ Import Namespace="System.Data" %> 
 <%@ Import NameSpace="System.Data.SqlClient" %> 
 <%
 SqlDataReader myDataReader; 

 SqlConnection myConnection = new http://aspfree.com/chapters/sams/graphics/ccc.gifSqlConnection( "server=localhost;uid=sa;database=Pubs" ); 

 myConnection.Open(); 

 SqlCommand myCommand = new SqlCommand( "Select * from http://aspfree.com/chapters/sams/graphics/ccc.gifAuthors", myConnection );
 myDataReader = myCommand.ExecuteReader();

 while ( myDataReader.Read() )
 {

  Response.Write( myDataReader[ "au_lname" ].ToString() );
 }
 myDataReader.Close();
 myConnection.Close();

 %>

5.3使用OleDbDataReader进行数据库查询

<%@ Import Namespace="System.Data" %>


 <%@ Import NameSpace="System.Data.OleDb" %> 

 <%
 Dim myConnection As OleDbConnection 

 Dim myCommand As OleDbCommand 
 Dim myDataReader As OleDbDataReader 

 myConnection = New OleDbConnection( "PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA http://aspfree.com/chapters/sams/graphics/ccc.gifSource=c:authors.mdb" )

 myConnection.Open()
 myCommand = New OleDbCommand( "Select * from Authors", myConnection )

 myDataReader = myCommand.ExecuteReader()
 While myDataReader.Read

 Response.Write( myDataReader.Item( "author" ) )

 End While
 myDataReader.Close()

 myConnection.Close

 %>

5.5使用sql Parameters

<%@ Import Namespace="System.Data" %> 

 <%@ Import NameSpace="System.Data.SqlClient" %> 

 <% 

 Dim myConnection As SqlConnection 

 Dim myCommand As SqlCommand 

 Dim FirstName As String = "Robert"

 Dim LastName As String = "Johnson" 

 myConnection = New SqlConnection( "server=localhost;uid=sa;pwd=secret;database=myData" )

 myConnection.Open()
myCommand = New SQLCommand( "Insert Authors ( FirstName, LastName ) http://aspfree.com/chapters/sams/graphics/ccc.gifValues ( @FirstName, @LastName )", myConnection )

 myCommand.Parameters.Add( New SqlParameter( "@FirstName", http://aspfree.com/chapters/sams/graphics/ccc.gifSqlDbType.Varchar, 30 ))
 myCommand.Parameters( "@FirstName" ).Value = FirstName

 myCommand.Parameters.Add( New SqlParameter( "@LastName", http://aspfree.com/chapters/sams/graphics/ccc.gifSqlDbType.Varchar, 30 ))
 myCommand.Parameters( "@LastName" ).Value = LastName

 myCommand.ExecuteNonQuery()
 myConnection.Close()
 %>
 Record Inserted!

5.6使用sql Parameters(access)

<%@ Import Namespace="System.Data" %> 

 <%@ Import NameSpace="System.Data.OleDb" %> 

<% 

 Dim myConnection As OleDbConnection 

 Dim myCommand As OleDbCommand 

 Dim FirstName As String = "Robert" 

 Dim LastName As String = "Johnson" 

 myConnection = New OleDbConnection( "PROVIDER=Microsoft.Jet.OLEDB.4.0;http://aspfree.com/chapters/sams/graphics/ccc.gifDATA Source=c:author2.mdb" )

 myConnection.Open()

 myCommand = New OleDbCommand( "Insert INTO Authors ( FirstName, LastName ) http://aspfree.com/chapters/sams/graphics/ccc.gifValues ( @FirstName, @LastName )", myConnection )

 myCommand.Parameters.Add( New OleDbParameter( "@FirstName", http://aspfree.com/chapters/sams/graphics/ccc.gifOleDbType.Varchar, 30 ))

 myCommand.Parameters( "@FirstName" ).Value = FirstName

 myCommand.Parameters.Add( New OleDbParameter( "@LastName", http://aspfree.com/chapters/sams/graphics/ccc.gifOleDbType.Varchar, 30 ))

 myCommand.Parameters( "@LastName" ).Value = LastName

 myCommand.ExecuteNonQuery()

 myConnection.Close()

 %>

 Record Inserted!