VB.Net by API/System.Data.OleDb/OleDbDataAdapter
Содержание
New OleDbDataAdapter
<source lang="vbnet"> Imports System Imports System.Xml Imports System.Xml.Schema Imports System.IO Imports System.Data.OleDb Imports System.Data.rumon Imports System.Data
Public Class MainClass
Shared Sub Main()
Dim dsUsers As New DataSet("Users")
Try
Dim dbConn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Password=;User ID=Admin;Data Source=Employee.mdb")
Dim daUsers As New OleDbDataAdapter("SELECT ID, FirstName, LastName FROM Employee", dbConn)
Dim dcmUserID As New DataColumnMapping("ID", "EmployeeID")
Dim dcmFirstName As New DataColumnMapping("FirstName", "FirstName")
Dim dcmLastName As New DataColumnMapping("LastName", "LastName")
Dim dtmUsers As New DataTableMapping("Table", "Employee")
dtmUsers.ColumnMappings.Add(dcmUserID)
dtmUsers.ColumnMappings.Add(dcmFirstName)
dtmUsers.ColumnMappings.Add(dcmLastName)
daUsers.TableMappings.Add(dtmUsers)
daUsers.Fill(dsUsers)
Dim cb As New OleDbCommandBuilder(daUsers)
Dim r As DataRow = dsUsers.Tables(0).NewRow()
r("FirstName") = "Eddie"
r("LastName") = "Robinson"
dsUsers.Tables(0).Rows.Add(r)
daUsers.Update(dsUsers.GetChanges())
dsUsers.AcceptChanges()
Catch ex As Exception
dsUsers.RejectChanges()
Console.WriteLine(ex.Message)
End Try
End Sub
End Class
</source>
OleDbDataAdapter.Fill
<source lang="vbnet">
Imports System Imports System.Data Imports System.Data.OleDb Imports System.Data.SqlClient Imports System.Collections Imports System.Windows.Forms Imports System.Resources Public Class MainClass
Shared Sub Main()
Dim strConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Employee.mdb;"
Dim objConnection As New OleDbConnection(strConnectionString)
Dim strSQL As String = "SELECT FirstName, LastName FROM Employee"
Dim objCommand As New OleDbCommand(strSQL, objConnection)
Dim objDataAdapter As New OleDbDataAdapter(objCommand)
Dim objDataTable As New Data.DataTable("Employee")
Dim objDataRow As DataRow
Try
objConnection.Open()
objDataAdapter.Fill(objDataTable)
For Each objDataRow In objDataTable.Rows
Console.WriteLine(objDataRow.Item("FirstName") & " " & objDataRow.Item("LastName"))
Next
Catch OleDbExceptionErr As OleDbException
Console.WriteLine(OleDbExceptionErr.Message)
Catch InvalidOperationExceptionErr As InvalidOperationException
Console.WriteLine(InvalidOperationExceptionErr.Message)
End Try
objConnection.Close()
objDataRow = Nothing
objDataTable.Dispose()
objDataTable = Nothing
objDataAdapter.Dispose()
objDataAdapter = Nothing
objCommand.Dispose()
objCommand = Nothing
objConnection.Dispose()
objConnection = Nothing
End Sub
End Class
</source>
OleDbDataAdapter.SelectCommand
<source lang="vbnet"> Imports System Imports System.Data Imports System.Data.SqlClient Imports System.Collections Imports System.Windows.Forms Imports System.Resources Public Class MainClass
Shared Dim OleDbConnection As System.Data.OleDb.OleDbConnection
Shared Sub Main()
Connect()
Dim OleDbSelectCommand As System.Data.OleDb.OleDbCommand
OleDbSelectCommand = New System.Data.OleDb.OleDbCommand()
OleDbSelectCommand.rumandText = "SELECT ID, FirstName, LastName,Salary FROM Employee"
OleDbSelectCommand.Connection = OleDbConnection
Dim AddressBookDataAdapter As System.Data.OleDb.OleDbDataAdapter
AddressBookDataAdapter = New System.Data.OleDb.OleDbDataAdapter()
AddressBookDataAdapter.SelectCommand = OleDbSelectCommand
Dim AddressBookDataSet As System.Data.DataSet
AddressBookDataSet = New System.Data.DataSet()
CType(AddressBookDataSet, System.ruponentModel.ISupportInitialize).EndInit()
AddressBookDataAdapter.Fill(AddressBookDataSet)
Dim dataTable As DataTable = AddressBookDataSet.Tables(0)
If dataTable.Rows.Count <> 0 Then
Dim recordNumber As Integer = Convert.ToInt32(dataTable.Rows(0)(0))
Console.WriteLine( recordNumber.ToString )
Console.WriteLine( Convert.ToString(dataTable.Rows(0)(1)) )
Console.WriteLine( Convert.ToString(dataTable.Rows(0)(2)) )
Console.WriteLine( Convert.ToString(dataTable.Rows(0)(3)) )
" display not-found message
Else
Console.WriteLine( "No record found" )
End If
End Sub
Shared Sub Connect()
OleDbConnection = New System.Data.OleDb.OleDbConnection()
OleDbConnection.ConnectionString = _
"Provider=Microsoft.Jet.OLEDB.4.0;Password="""";" & _
"User ID=Admin;Data Source=Employee.mdb;Mode=Sha" & _
"re Deny None;Extended Properties="""";" & _
"Jet OLEDB:System database="""";Jet OLEDB:Regis" & _
"try Path="""";Jet OLEDB:Database Password="""";" & _
"Jet OLEDB:Engine Type=5;Jet OLEDB:Dat" & _
"abase Locking Mode=1;Jet OLEDB:Global Partial " & _
"Bulk Ops=2;Jet OLEDB:Global Bulk T" & _
"ransactions=1;Jet OLEDB:New Database " & _
"Password="""";Jet OLEDB:Create System Databas" & _
"e=False;Jet OLEDB:Encrypt Database=False;" & _
"Jet OLEDB:Don"t Copy Locale on Compact=" & _
"False;Jet OLEDB:Compact Without Replica " & _
"Repair=False;Jet OLEDB:SFP=False"
Try
OleDbConnection.Open()
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
End Sub
Shared Sub Disconnect()
Try
OleDbConnection.Close()
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
End Sub
End Class
</source>
OleDbDataAdapter.TableMappings.Add
<source lang="vbnet">
Imports System Imports System.Xml Imports System.Xml.Schema Imports System.IO Imports System.Data.OleDb Imports System.Data.rumon Imports System.Data
Public Class MainClass
Shared Sub DoDataMappings(ByVal da As OleDbDataAdapter)
Try
" Define an array of column to map
Dim dcmMappedColumns() As DataColumnMapping = { _
New DataColumnMapping("ID", "EmployeeID"), _
New DataColumnMapping("FirstName", "FirstName"), _
New DataColumnMapping("LastName", "LastName")}
" Define the table containing the mapped columns
Dim dtmUsers As New DataTableMapping("Table", "Employee", _
dcmMappedColumns)
" Activate the mapping mechanism
da.TableMappings.Add(dtmUsers)
Catch ex As Exception
" An error occurred. Show the error message
Console.WriteLine(ex.Message)
End Try
End Sub
Shared Sub Main()
Try
" Define a connection object
Dim dbConn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Password=;User ID=Admin;Data Source=Employee.mdb")
" Create a data adapter to retrieve records from db
Dim daUsers As New OleDbDataAdapter("SELECT ID, FirstName, LastName FROM Employee", dbConn)
Dim dsUsers As New DataSet("Employee")
DoDataMappings(daUsers)
" Fill the dataset
daUsers.Fill(dsUsers)
" Go through the records and print them using the mapped names
Dim r As DataRow
For Each r In dsUsers.Tables("Employee").Rows
Console.WriteLine("ID: {0}, FirstName: {1}, LastName: {2}", r("EmployeeID"), r("FirstName"), r("LastName"))
Next
Catch ex As Exception
" An error occurred. Show the error message
Console.WriteLine(ex.Message)
End Try
End Sub
End Class
</source>
OleDbDataAdapter.Tables
<source lang="vbnet"> Imports System Imports System.Xml Imports System.Xml.Schema Imports System.IO Imports System.Data.OleDb Imports System.Collections Imports System.Data
Public Class MainClass
Shared Sub Main()
Try
Dim dbConn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Password=;User ID=Admin;Data Source=Employee.mdb")
Dim strSELECT As String = "SELECT ID AS EmployeeID, FirstName AS FirstName, LastName AS LastName FROM Employee"
Dim daUsers As New OleDbDataAdapter(strSELECT, dbConn)
Dim dsUsers As New DataSet("Employee")
daUsers.Fill(dsUsers)
Dim r As DataRow
For Each r In dsUsers.Tables(0).Rows
Console.WriteLine("ID: {0}, FirstName: {1}, LastName: {2}", r("EmployeeID"), r("FirstName"), r("LastName"))
Next
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
End Sub
End Class
</source>
