技术资料 > .Net专区 > 数据库应用 : ado.net数据操作全接触四（表关联，DataAdapter）

ado.net数据操作全接触四（表关联，DataAdapter）

March 25,2004

8.1创建一个（主/祥）表关联
1: <%@ Import Namespace="System.Data" %>
2: <%@ Import NameSpace="System.Data.SqlClient" %>
3:
4: <%
5: Dim myConnection As SqlConnection
6: Dim myDataAdapter As SqlDataAdapter
7: Dim myDataSet As DataSet
8: Dim myDataTable As DataTable
9: Dim Publisher As DataRow
10: Dim Title As DataRow
11:
12: myConnection = New SqlConnection( "server=localhost;uid=sa;pwd=secret;database=Pubs" )
13: myDataSet = New DataSet()
14: myDataAdapter = New SQLDataAdapter( "Select * From Publishers",
http://aspfree.com/chapters/sams/graphics/ccc.gifmyConnection )
15: myDataAdapter.Fill( myDataSet, "Publishers" )
16: myDataAdapter.SelectCommand = New SqlCommand( "Select * From Titles",
http://aspfree.com/chapters/sams/graphics/ccc.gifmyConnection )
17: myDataAdapter.Fill( myDataSet, "Titles" )
18:
19: myDataSet.Relations.Add( "PubTitles",
http://aspfree.com/chapters/sams/graphics/ccc.gifmyDataSet.Tables( "Publishers" ).Columns( "pub_id" ),
http://aspfree.com/chapters/sams/graphics/ccc.gifmyDataSet.Tables( "Titles" ).Columns( "pub_id" ) )
20:
21: For Each Publisher in myDataSet.Tables( "Publishers" ).Rows
22:  Response.Write( "<p>" & Publisher( "pub_name" ) & ":" )
23:  For Each Title In Publisher.GetChildRows( "PubTitles" )
24: Response.Write("<li>" & Title( "title" ) )
25:  Next
26: Next
27:
28: %>
29:
9.1使用DataAdapter UPDATE模式
1: <%@ Import Namespace="System.Data" %>
2: <%@ Import NameSpace="System.Data.SqlClient" %>
3:
4: <%
5: Dim myConnection As SqlConnection
6: Dim myDataAdapter As SqlDataAdapter
7: Dim myBuilder As SqlCommandBuilder
8: Dim myDataSet As DataSet
9: Dim myDataTable As DataTable
10: Dim Author As DataRow
11:
12: ' Create the DataSet and DataAdapter
13: myConnection = New SqlConnection( "server=localhost;uid=sa;pwd=secret;database=Pubs" )
14: myDataSet = New DataSet()
15: myDataAdapter = New SqlDataAdapter( "Select * From Author", myConnection )
16: myDataAdapter.Fill( myDataSet, "Authors" )
17:
18: ' Change value of first row
19: myDataSet.Tables( "Authors" ).Rows( 0 ).Item( "au_fname" ) = "Jane"
20:
21: ' Update the Database Table
22: myBuilder = New SqlCommandBuilder( myDataAdapter )
23: myDataAdapter.Update( myDataSet, "Authors" )
24:
25: ' Display the Records
26: For Each Author in myDataSet.Tables( "Authors" ).Rows
27:  Response.Write( "<p>" & Author( "au_fname" ) & " "
http://aspfree.com/chapters/sams/graphics/ccc.gif& Author( "au_lname" ) )
28: Next
29: %>
30:
9.2使用DataAdapter UPDATE模式（C#）

1: <%@ Page Language="C#" %>
2: <%@ Import Namespace="System.Data" %>
3: <%@ Import NameSpace="System.Data.SqlClient" %>
4:
5: <%
6: // Create the DataSet and DataAdapter
7: SqlConnection myConnection = new
http://aspfree.com/chapters/sams/graphics/ccc.gifSqlConnection( "server=localhost;uid=sa;pwd=secret;database=Pubs" );
8: DataSet myDataSet = new DataSet();
9: SqlDataAdapter myDataAdapter = new SqlDataAdapter(
http://aspfree.com/chapters/sams/graphics/ccc.gif"Select * From Authors3", myConnection );
10: myDataAdapter.Fill( myDataSet, "Authors" );
11:
12: // Change value of first row
13: myDataSet.Tables[ "Authors" ].Rows[ 0 ][ "au_fname" ] = "Jane";
14:
15: // Update the Database Table
16: SqlCommandBuilder myBuilder = new SqlCommandBuilder( myDataAdapter );
17: myDataAdapter.Update( myDataSet, "Authors" );
18:
19: // Display the Records
20: foreach ( DataRow Author in myDataSet.Tables[ "Authors" ].Rows )
21: {
22:  Response.Write( "<p>" + Author[ "au_fname" ] + " "
http://aspfree.com/chapters/sams/graphics/ccc.gif+ Author[ "au_lname" ] );
23: }
24: %>
25: