使用DbProviderFactories的数据库操作类 
Imports System.Data 
Imports System.Configuration 
Imports System.Data.Common 
'******************************************************************* 
'* Page/Class Name：XPDBHelper.vb 
'* Title：使用DbProviderFactories的数据库操作类 
'* Description：简单三层结构数据库操作类 
'* Copyright： 
'* Company： 
'* @author：Owen,Yuan 
'* Create Date：2010/3/9 14:04:56 
'* Last Modifier： 
'* Last Modify Date： 
'******************************************************************* 
Public Class XPDBHelper 
'取得连接字符串中的数据库驱动提供者 
Private Shared dbProviderName As String = ConfigurationManager.ConnectionStrings("ConnectionString").ProviderName 
'取得数据库连接字符串 
Private Shared dbConnectionString As String = ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString 
'数据库连接。 
Private connection As DbConnection 
Public Sub New() 
Me.connection = CreateConnection(XPDBHelper.dbConnectionString) 
End Sub 
Public Sub New(ByVal connectionString As String) 
Me.connection = CreateConnection(connectionString) 
End Sub 
'创建数据库连接 
Public Shared Function CreateConnection() As DbConnection 
Dim dbfactory As DbProviderFactory = DbProviderFactories.GetFactory(dbProviderName) 
Dim dbconn As DbConnection = dbfactory.CreateConnection() 
dbconn.ConnectionString = XPDBHelper.dbConnectionString 
Return dbconn 
End Function 
'创建数据库连接 
Public Shared Function CreateConnection(ByVal connectionString As String) As DbConnection 
Dim dbfactory As DbProviderFactory = DbProviderFactories.GetFactory(dbProviderName) 
Dim dbconn As DbConnection = dbfactory.CreateConnection() 
dbconn.ConnectionString = connectionString 
Return dbconn 
End Function 
'根据存储过程创建DbCommand 
Public Function GetStoredProcCommond(ByVal storedProcedure As String) As DbCommand 
Dim dbCommand As DbCommand = connection.CreateCommand() 
dbCommand.CommandText = storedProcedure 
dbCommand.CommandType = CommandType.StoredProcedure 
Return dbCommand 
End Function 
'根据SQL语句创建DbCommand 
Public Function GetSqlStringCommond(ByVal sqlQuery As String) As DbCommand 
Dim dbCommand As DbCommand = connection.CreateCommand() 
dbCommand.CommandText = sqlQuery 
dbCommand.CommandType = CommandType.Text 
Return dbCommand 
End Function 
#Region "增加参数" 
Public Sub AddParameterCollection(ByVal cmd As DbCommand, ByVal dbParameterCollection As DbParameterCollection) 
For Each dbParameter As DbParameter In dbParameterCollection 
cmd.Parameters.Add(dbParameter) 
Next 
End Sub 
Public Sub AddOutParameter(ByVal cmd As DbCommand, ByVal parameterName As String, ByVal dbType As DbType, ByVal size As Integer) 
Dim dbParameter As DbParameter = cmd.CreateParameter() 
dbParameter.DbType = dbType 
dbParameter.ParameterName = parameterName 
dbParameter.Size = size 
dbParameter.Direction = ParameterDirection.Output 
cmd.Parameters.Add(dbParameter) 
End Sub 

Public Sub AddInParameter(ByVal cmd As DbCommand, ByVal parameterName As String, ByVal dbType As DbType, ByVal value As Object) 
Dim dbParameter As DbParameter = cmd.CreateParameter() 
dbParameter.DbType = dbType 
dbParameter.ParameterName = parameterName 
dbParameter.Value = value 
dbParameter.Direction = ParameterDirection.Input 
cmd.Parameters.Add(dbParameter) 
End Sub 
Public Sub AddReturnParameter(ByVal cmd As DbCommand, ByVal parameterName As String, ByVal dbType As DbType) 
Dim dbParameter As DbParameter = cmd.CreateParameter() 
dbParameter.DbType = dbType 
dbParameter.ParameterName = parameterName 
dbParameter.Direction = ParameterDirection.ReturnValue 
cmd.Parameters.Add(dbParameter) 
End Sub 
Public Function GetParameter(ByVal cmd As DbCommand, ByVal parameterName As String) As DbParameter 
Return cmd.Parameters(parameterName) 
End Function 
#End Region 
#Region "执行" 
'执行DbCommand，返回DataSet 
Public Function ExecuteDataSet(ByVal cmd As DbCommand) As DataSet 
Dim dbfactory As DbProviderFactory = DbProviderFactories.GetFactory(dbProviderName) 
Dim dbDataAdapter As DbDataAdapter = dbfactory.CreateDataAdapter() 
dbDataAdapter.SelectCommand = cmd 
Dim ds As DataSet = New DataSet() 
dbDataAdapter.Fill(ds) 
Return ds 
End Function 
'执行DbCommand，返回DataTable 
Public Function ExecuteDataTable(ByVal cmd As DbCommand) As DataTable 
Dim dbfactory As DbProviderFactory = DbProviderFactories.GetFactory(dbProviderName) 
Dim dbDataAdapter As DbDataAdapter = dbfactory.CreateDataAdapter() 
dbDataAdapter.SelectCommand = cmd 
Dim dataTable As DataTable = New DataTable() 
dbDataAdapter.Fill(dataTable) 
Return dataTable 
End Function 
'执行DbCommand，返回DbDataReader 
Public Function ExecuteReader(ByVal cmd As DbCommand) As DbDataReader 
cmd.Connection.Open() 
Dim reader As DbDataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection) 
cmd.Connection.Close() 
Return reader 
End Function 
Public Function ExecuteNonQuery(ByVal cmd As DbCommand) As Integer 
cmd.Connection.Open() 
Dim ret As Integer = cmd.ExecuteNonQuery() 
cmd.Connection.Close() 
Return ret 
End Function 
Public Function ExecuteScalar(ByVal cmd As DbCommand) As Object 
cmd.Connection.Open() 
Dim ret As Object = cmd.ExecuteScalar() 
cmd.Connection.Close() 
Return ret 
End Function 
#End Region 
#Region "执行事务" 
Public Function ExecuteDataSet(ByVal cmd As DbCommand, ByVal t As XPTransaction) As DataSet 
cmd.Connection = t.DbConnection 
cmd.Transaction = t.DbTransact 
Dim dbfactory As DbProviderFactory = DbProviderFactories.GetFactory(XPDBHelper.dbProviderName) 
Dim dbDataAdapter As DbDataAdapter = dbfactory.CreateDataAdapter() 
dbDataAdapter.SelectCommand = cmd 
Dim ds As DataSet = New DataSet() 
dbDataAdapter.Fill(ds) 
Return ds 
End Function 
Public Function ExecuteDataTable(ByVal cmd As DbCommand, ByVal t As XPTransaction) As DataTable 
cmd.Connection = t.DbConnection 
cmd.Transaction = t.DbTransact 
Dim dbfactory As DbProviderFactory = DbProviderFactories.GetFactory(XPDBHelper.dbProviderName) 
Dim dbDataAdapter As DbDataAdapter = dbfactory.CreateDataAdapter() 
dbDataAdapter.SelectCommand = cmd 
Dim dataTable As DataTable = New DataTable() 
dbDataAdapter.Fill(dataTable) 
Return dataTable 
End Function 
Public Function ExecuteReader(ByVal cmd As DbCommand, ByVal t As XPTransaction) As DbDataReader 
cmd.Connection.Close() 
cmd.Connection = t.DbConnection 
cmd.Transaction = t.DbTransact 
Dim reader As DbDataReader = cmd.ExecuteReader() 
Return reader 
End Function 
Public Function ExecuteNonQuery(ByVal cmd As DbCommand, ByVal t As XPTransaction) As Integer 
cmd.Connection.Close() 
cmd.Connection = t.DbConnection 
cmd.Transaction = t.DbTransact 
Return cmd.ExecuteNonQuery() 
End Function 
Public Function ExecuteScalar(ByVal cmd As DbCommand, ByVal t As XPTransaction) As Object 
cmd.Connection.Close() 
cmd.Connection = t.DbConnection 
cmd.Transaction = t.DbTransact 
Return cmd.ExecuteScalar() 
End Function 
#End Region 
End Class 
 

简单三层结构数据库事务处理类 
 代码如下:

Imports System.Data 
Imports System.Data.Common 
'******************************************************************* 
'* Page/Class Name：XPTransaction.vb 
'* Title：数据库事务处理类 
'* Description：简单三层结构数据库事务处理类 
'* Copyright： 
'* Company： 
'* @author：Owen,Yuan 
'* Create Date：2010/3/22 10:44:20 
'* Last Modifier： 
'* Last Modify Date： 
'******************************************************************* 
Public Class XPTransaction 
Implements IDisposable 
Private conn As DbConnection 
Private dbTrans As DbTransaction 
Public Property DbConnection() As DbConnection 
Get 
Return Me.conn 
End Get 
Set(ByVal Value As DbConnection) 
Me.conn = Value 
End Set 
End Property 
Public Property DbTransact() As DbTransaction 
Get 
Return Me.dbTrans 
End Get 
Set(ByVal Value As DbTransaction) 
Me.dbTrans = Value 
End Set 
End Property 
Public Sub New() 
conn = XPDBHelper.CreateConnection() 
conn.Open() 
dbTrans = conn.BeginTransaction() 
End Sub 
Public Sub New(ByVal connectionString As String) 
conn = XPDBHelper.CreateConnection(connectionString) 
conn.Open() 
dbTrans = conn.BeginTransaction() 
End Sub 
Public Sub Commit() 
dbTrans.Commit() 
Me.Colse() 
End Sub 
Public Sub RollBack() 
dbTrans.Rollback() 
Me.Colse() 
End Sub 
Public Sub Colse() 
If conn.State = ConnectionState.Open Then 
conn.Close() 
End If 
End Sub 
Private disposedValue As Boolean = False ' 检测冗余的调用 
' IDisposable 
Protected Overridable Sub Dispose(ByVal disposing As Boolean) 
If Not Me.disposedValue Then 
If disposing Then 
conn.Close() 
' TODO: 释放其他状态(托管对象)。 
End If 
conn = Nothing 
dbTrans = Nothing 
' TODO: 释放您自己的状态(非托管对象)。 
' TODO: 将大型字段设置为 null。 
End If 
Me.disposedValue = True 
End Sub 
#Region " IDisposable Support " 
' Visual Basic 添加此代码是为了正确实现可处置模式。 
Public Sub Dispose() Implements IDisposable.Dispose 
' 不要更改此代码。请将清理代码放入上面的 Dispose(ByVal disposing As Boolean) 中。 
Dispose(True) 
GC.SuppressFinalize(Me) 
End Sub 
#End Region 
End Class 

 
 




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