VB.Net by API/System.Data.SqlClient/SqlDataAdapter
Содержание
SqlDataAdapter.FillSchema
<source lang="vbnet">
Imports System Imports System.Xml Imports System.Xml.Schema Imports System.IO Imports System.Data.SqlClient Imports System.Collections Imports System.Data
Public Class MainClass
Shared Sub Main() Dim da As New SqlDataAdapter( _ "SELECT ID, FirstName, LastName FROM Employee", _ "Server=(local)\SQLEXPRESS;Initial Catalog=MyDatabase;Integrated Security=SSPI") Dim ds As New DataSet("Employee") da.FillSchema(ds, SchemaType.Source) ds.ReadXml("Employee.xml") Dim Table As DataTable = ds.Tables(0) Dim numCols As Integer = Table.Columns.Count Dim Row As DataRow For Each Row In Table.Rows Dim i As Integer For i = 0 To numCols - 1 Console.WriteLine(Table.Columns(i).ColumnName & " = " & Row(i)) Next Console.WriteLine() Next End Sub
End Class
</source>
SqlDataAdapter.ReadXml
<source lang="vbnet">
Imports System Imports System.Xml Imports System.Xml.Schema Imports System.IO Imports System.Data.SqlClient Imports System.Collections Imports System.Data
Public Class MainClass
Shared Sub Main() Dim da As New SqlDataAdapter( _ "SELECT ID, FirstName, LastName FROM Employee", _ "Server=(local)\SQLEXPRESS;Initial Catalog=MyDatabase;Integrated Security=SSPI") Dim ds As New DataSet("Employee") da.FillSchema(ds, SchemaType.Source) ds.ReadXml("Employee.xml") Dim Table As DataTable = ds.Tables(0) Dim numCols As Integer = Table.Columns.Count Dim Row As DataRow For Each Row In Table.Rows Dim i As Integer For i = 0 To numCols - 1 Console.WriteLine(Table.Columns(i).ColumnName & " = " & Row(i)) Next Console.WriteLine() Next End Sub
End Class
</source>
SqlDataAdapter.RowUpdated
<source lang="vbnet"> Imports System Imports System.Data Imports System.Data.SqlClient
public class MainClass
Shared Sub Main() Dim thisConnection As New SqlConnection("server=(local)\SQLEXPRESS;" & _ "integrated security=sspi;database=MyDatabase") Dim sql As String = "SELECT FirstName, LastName From Employee" Try thisConnection.Open() Dim thisAdapter As New SqlDataAdapter(sql, thisConnection) Dim cb As New SqlCommandBuilder(thisAdapter) Dim ds As New DataSet thisAdapter.Fill(ds, 0, 1, "Customers") AddHandler thisAdapter.RowUpdating, AddressOf OnRowUpdating AddHandler thisAdapter.RowUpdated, AddressOf OnRowUpdated Dim dt As DataTable = ds.Tables("Customers") dt.Rows(0)(1) = "The Volcano Corporation" thisAdapter.Update(ds, "Customers") RemoveHandler thisAdapter.RowUpdating, AddressOf OnRowUpdating RemoveHandler thisAdapter.RowUpdated, AddressOf OnRowUpdated Catch ex As SqlException Console.WriteLine(ex.Message) Finally " Close Connection thisConnection.Close() End Try End Sub " Handler for OnRowUpdating Shared Private Sub OnRowUpdating(ByVal sender As Object, ByVal e As SqlRowUpdatingEventArgs) Console.WriteLine("OnRowUpdating Event") If Not e.Status = UpdateStatus.Continue Then Console.WriteLine("RowStatus = " & e.Status.ToString()) End If End Sub " Handler for OnRowUpdated Shared Private Sub OnRowUpdated(ByVal sender As Object, ByVal e As SqlRowUpdatedEventArgs) Console.WriteLine("OnRowUpdated Event") Console.WriteLine("Records Affected = " & e.RecordsAffected.ToString()) End Sub
End Class
</source>
SqlDataAdapter.RowUpdating
<source lang="vbnet"> Imports System Imports System.Data Imports System.Data.SqlClient
public class MainClass
Shared Sub Main() Dim thisConnection As New SqlConnection("server=(local)\SQLEXPRESS;" & _ "integrated security=sspi;database=MyDatabase") Dim sql As String = "SELECT FirstName, LastName From Employee" Try thisConnection.Open() Dim thisAdapter As New SqlDataAdapter(sql, thisConnection) Dim cb As New SqlCommandBuilder(thisAdapter) Dim ds As New DataSet thisAdapter.Fill(ds, 0, 1, "Customers") AddHandler thisAdapter.RowUpdating, AddressOf OnRowUpdating AddHandler thisAdapter.RowUpdated, AddressOf OnRowUpdated Dim dt As DataTable = ds.Tables("Customers") dt.Rows(0)(1) = "The Volcano Corporation" thisAdapter.Update(ds, "Customers") RemoveHandler thisAdapter.RowUpdating, AddressOf OnRowUpdating RemoveHandler thisAdapter.RowUpdated, AddressOf OnRowUpdated Catch ex As SqlException Console.WriteLine(ex.Message) Finally " Close Connection thisConnection.Close() End Try End Sub " Handler for OnRowUpdating Shared Private Sub OnRowUpdating(ByVal sender As Object, ByVal e As SqlRowUpdatingEventArgs) Console.WriteLine("OnRowUpdating Event") If Not e.Status = UpdateStatus.Continue Then Console.WriteLine("RowStatus = " & e.Status.ToString()) End If End Sub " Handler for OnRowUpdated Shared Private Sub OnRowUpdated(ByVal sender As Object, ByVal e As SqlRowUpdatedEventArgs) Console.WriteLine("OnRowUpdated Event") Console.WriteLine("Records Affected = " & e.RecordsAffected.ToString()) End Sub
End Class
</source>
SqlDataAdapter.SelectCommand
<source lang="vbnet">
Imports System Imports System.Drawing Imports System.Collections Imports System.ruponentModel Imports System.Windows.Forms Imports System.Data Imports System.Data.SqlClient
Public Class MainClass
Shared Sub Main( ) Application.Run(New ADOForm1() ) End Sub
End Class
Public Class ADOForm1 Inherits System.Windows.Forms.Form Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid Private components As System.ruponentModel.Container " private System.Data.ADO.ADOConnection myConnection; Private myConnection As System.Data.SqlClient.SqlConnection Private myDataSet As System.Data.DataSet Private myCommand As System.Data.SqlClient.SqlCommand Private myCommand2 As System.Data.SqlClient.SqlCommand Private myDataAdapter As System.Data.SqlClient.SqlDataAdapter Private myDataAdapter2 As System.Data.SqlClient.SqlDataAdapter Public Sub New( ) InitializeComponent( ) " create the connection object and open it Dim connectionString As String = _ "server=localhost; uid=sa; " & _ "pwd=YourPassword; database=northwind" myConnection = _ New System.Data.SqlClient.SqlConnection(connectionString) myConnection.Open( ) " create the DataSet and set a property myDataSet = New System.Data.DataSet( ) myDataSet.CaseSensitive = True " create the SqlCommand object and assign the " connection and the select statement myCommand = New System.Data.SqlClient.SqlCommand( ) myCommand.Connection = myConnection myCommand.rumandText = "Select * from Employees" myCommand2 = New System.Data.SqlClient.SqlCommand( ) myCommand2.Connection = myConnection myCommand2.rumandText = "Select * from Orders" " create the myDataAdapter object and pass in the " SQL Command object and establish the table mappings myDataAdapter = New System.Data.SqlClient.SqlDataAdapter( ) myDataAdapter2 = New System.Data.SqlClient.SqlDataAdapter( ) myDataAdapter.SelectCommand = myCommand myDataAdapter2.SelectCommand = myCommand2 myDataAdapter.TableMappings.Add("Table", "Employees") myDataAdapter2.TableMappings.Add("Table", "Orders") " Tell the myDataAdapter object to fill the DataSet myDataAdapter.Fill(myDataSet) myDataAdapter2.Fill(myDataSet) Dim myDataRelation As System.Data.DataRelation Dim dataColumn1 As System.Data.DataColumn Dim dataColumn2 As System.Data.DataColumn dataColumn1 = _ myDataSet.Tables("Employees").Columns("EmployeeID") dataColumn2 = _ myDataSet.Tables("Orders").Columns("EmployeeID") myDataRelation = New System.Data.DataRelation( _ "EmployeesToOrders", dataColumn1, dataColumn2) myDataSet.Relations.Add(myDataRelation) Dim dataSetView As DataViewManager = _ myDataSet.DefaultViewManager " display it in the grid DataGrid1.DataSource = _ dataSetView DataGrid1.DataMember = "Employees" End Sub "New Private Sub InitializeComponent( ) Me.ruponents = New System.ruponentModel.Container( ) Me.dataGrid1 = New System.Windows.Forms.DataGrid( ) dataGrid1.Location = New System.Drawing.Point(48, 24) dataGrid1.Size = New System.Drawing.Size(368, 160) dataGrid1.TabIndex = 0 Me.Text = "ADOFrm1" Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(464, 273) Me.Controls.Add(dataGrid1) End Sub End Class </source>
SqlDataAdapter.TableMappings.Add
<source lang="vbnet"> Imports System Imports System.Data Imports System.Windows.Forms Imports System.Data.SqlClient public class MainClass
Shared Sub Main() Dim form1 As Form = New Form1 Application.Run(form1) End Sub
End Class
Public Class Form1
Inherits System.Windows.Forms.Form
- Region " Windows Form Designer generated code "
Public Sub New() MyBase.New() "This call is required by the Windows Form Designer. InitializeComponent() "Add any initialization after the InitializeComponent() call End Sub "Form overrides dispose to clean up the component list. Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub "Required by the Windows Form Designer Private components As System.ruponentModel.IContainer "NOTE: The following procedure is required by the Windows Form Designer "It can be modified using the Windows Form Designer. "Do not modify it using the code editor. Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid Friend WithEvents DataSet1 As System.Data.DataSet <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.DataGrid1 = New System.Windows.Forms.DataGrid Me.DataSet1 = New System.Data.DataSet CType(Me.DataGrid1, System.ruponentModel.ISupportInitialize).BeginInit() CType(Me.DataSet1, System.ruponentModel.ISupportInitialize).BeginInit() Me.SuspendLayout() " "DataGrid1 " Me.DataGrid1.DataMember = "" Me.DataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText Me.DataGrid1.Location = New System.Drawing.Point(0, 0) Me.DataGrid1.Name = "DataGrid1" Me.DataGrid1.Size = New System.Drawing.Size(416, 224) Me.DataGrid1.TabIndex = 0 " "DataSet1 " Me.DataSet1.DataSetName = "NewDataSet" Me.DataSet1.Locale = New System.Globalization.CultureInfo("en-GB") " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(408, 221) Me.Controls.Add(Me.DataGrid1) Me.Name = "Form1" Me.Text = "Form1" CType(Me.DataGrid1, System.ruponentModel.ISupportInitialize).EndInit() CType(Me.DataSet1, System.ruponentModel.ISupportInitialize).EndInit() Me.ResumeLayout(False) End Sub
- End Region
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load "Create Connection object Dim thisConnection As New SqlConnection _ ("server=(local)\SQLEXPRESS;" & _ "integrated security=sspi;" & _ "database=MyDatabase") " Sql Queries Dim sql1 As String = _ "SELECT * FROM Employee; " Dim sql2 As String = _ "SELECT * FROM Employee" Dim sql As String = sql1 & sql2 " Create Data Adapter Dim da As New SqlDataAdapter(sql, thisConnection) " Map Default table names to Employees and Orders da.TableMappings.Add("Table", "Employee") da.TableMappings.Add("Table1", "Employee") " Fill Dataset da.Fill(DataSet1) " Create a relation between the two tables "Dim dr As New DataRelation( _ " "EmployeeOrder", _ " DataSet1.Tables(0).Columns("ID"), _ " DataSet1.Tables(1).Columns("ID")) "DataSet1.Relations.Add(dr) " Bind the data to the grid at runtime DataGrid1.SetDataBinding(DataSet1, "Employee") End Sub
End Class
</source>
SqlDataAdapter.WriteXml
<source lang="vbnet"> Imports System Imports System.Data Imports System.Data.SqlClient
public class MainClass
Shared Sub Main() Dim thisConnection As New SqlConnection("server=(local)\SQLEXPRESS;" & _ "integrated security=sspi;database=MyDatabase") " Sql Query Dim sql As String = _ "SELECT * FROM Employee" Try " Create Data Adapter Dim da As New SqlDataAdapter da.SelectCommand = New SqlCommand(sql, thisConnection) " Create and fill Dataset Dim ds As New DataSet da.Fill(ds, "Employee") " Extract DataSet to XML file ds.WriteXml("Employee.xml") Catch ex As SqlException " Display error Console.WriteLine("Error: " & ex.ToString()) Finally " Close Connection thisConnection.Close() Console.WriteLine("Connection Closed") End Try End Sub
End Class
</source>