sqlhelper vb.net版

Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Imports System.Collections
Public MustInherit Class SqlHelper
''' <summary>
''' 哈希表：缓存参数
''' </summary>
''' <remarks></remarks>
Public Shared parmCache As Hashtable = Hashtable.Synchronized(New Hashtable())
''' <summary>
'''
''' </summary>
''' <param name="connectionString"></param>
''' <param name="cmdType"></param>
''' <param name="cmdText"></param>
''' <param name="commandParameters">ParamArray 表示函数参数个数不确定C#中为params</param>
''' <returns></returns>
''' <remarks></remarks>
Public Shared Function ExecuteNonquery(ByVal connectionString As String, ByVal cmdType As CommandType, ByVal cmdText As String, ByVal ParamArray commandParameters As SqlParameter()) As Int32
Dim cmd As SqlCommand = New SqlCommand
Using conn As SqlConnection = New SqlConnection(connectionString)
PrepareCommand(cmd, conn, Nothing, cmdType, cmdText, commandParameters)
Dim val As Int32 = cmd.ExecuteNonQuery()
cmd.Parameters.Clear()
Return val
End Using
End Function
''' <summary>
'''
''' </summary>
''' <param name="connection"></param>
''' <param name="cmdType"></param>
''' <param name="cmdText"></param>
''' <param name="commandParameters">ParamArray 表示函数参数个数不确定C#中为params</param>
''' <returns></returns>
''' <remarks></remarks>
Public Shared Function ExecuteNonQuery(ByVal connection As SqlConnection, ByVal cmdType As CommandType, ByVal cmdText As String, ByVal ParamArray commandParameters As SqlParameter()) As Int32
Dim cmd As SqlCommand = New SqlCommand
PrepareCommand(cmd, connection, Nothing, cmdType, cmdText, commandParameters)
Dim val As Int32 = cmd.ExecuteNonQuery()
cmd.Parameters.Clear()
Return val
End Function
''' <summary>
'''
''' </summary>
''' <param name="trans"></param>
''' <param name="cmdType"></param>
''' <param name="cmdText"></param>
''' <param name="commandParameters">ParamArray 表示函数参数个数不确定C#中为params</param>
''' <returns></returns>
''' <remarks></remarks>
Public Shared Function ExecuteNonQuery(ByVal trans As SqlTransaction, ByVal cmdType As CommandType, ByVal cmdText As String, ByVal ParamArray commandParameters As SqlParameter()) As Int32
Dim cmd As SqlCommand = New SqlCommand
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters)
Dim val As Int32 = cmd.ExecuteNonQuery()
cmd.Parameters.Clear()
Return val
End Function
''' <summary>
''' 返回数据集，可以包含多个表，这是我自己加上的，用以返回数据集，表
''' </summary>
''' <param name="connectionString"></param>
''' <param name="cmdType"></param>
''' <param name="cmdText"></param>
''' <param name="commandParameters"></param>
''' <returns></returns>
''' <remarks></remarks>
Public Shared Function ExecuteDataSet(ByVal connectionString As String, ByVal cmdType As CommandType, ByVal cmdText As String, ByVal ParamArray commandParameters As SqlParameter()) As DataSet
Dim cmd As SqlCommand = New SqlCommand
Using conn As SqlConnection = New SqlConnection(connectionString)
PrepareCommand(cmd, conn, Nothing, cmdType, cmdText, commandParameters)
Dim adp As SqlDataAdapter = New SqlDataAdapter(cmd)
Dim ds As DataSet = New DataSet
Try
adp.Fill(ds)
cmd.Parameters.Clear()
Finally
adp.Dispose()
End Try
Return ds
End Using
End Function
''' <summary>
'''
''' </summary>
''' <param name="connectionString"></param>
''' <param name="cmdType"></param>
''' <param name="cmdText"></param>
''' <param name="commandParameters">ParamArray 表示函数参数个数不确定C#中为params</param>
''' <returns></returns>
''' <remarks></remarks>
Public Shared Function ExecuteReader(ByVal connectionString As String, ByVal cmdType As CommandType, ByVal cmdText As String, ByVal ParamArray commandParameters As SqlParameter()) As SqlDataReader
Dim cmd As SqlCommand = New SqlCommand
Dim conn As SqlConnection = New SqlConnection(connectionString)
Try
PrepareCommand(cmd, conn, Nothing, cmdType, cmdText, commandParameters)
Dim rdr As SqlDataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection)
cmd.Parameters.Clear()
Return rdr
Catch ex As Exception
conn.Close()
Throw
End Try
End Function
''' <summary>
'''
''' </summary>
''' <param name="connectionString"></param>
''' <param name="cmdType"></param>
''' <param name="cmdText"></param>
''' <param name="commandParameters">ParamArray 表示函数参数个数不确定C#中为params</param>
''' <returns></returns>
''' <remarks></remarks>
Public Shared Function ExecuteScalar(ByVal connectionString As String, ByVal cmdType As CommandType, ByVal cmdText As String, ByVal ParamArray commandParameters As SqlParameter()) As Object
Dim cmd As SqlCommand = New SqlCommand
Using connection As SqlConnection = New SqlConnection(connectionString)
PrepareCommand(cmd, connection, Nothing, cmdType, cmdText, commandParameters)
Dim val As Object = cmd.ExecuteScalar()
cmd.Parameters.Clear()
Return val
End Using
End Function
''' <summary>
'''
''' </summary>
''' <param name="connection"></param>
''' <param name="cmdType"></param>
''' <param name="cmdText"></param>
''' <param name="commandParameters">ParamArray 表示函数参数个数不确定C#中为params</param>
''' <returns></returns>
''' <remarks></remarks>
Public Shared Function ExecuteScalar(ByVal connection As SqlConnection, ByVal cmdType As CommandType, ByVal cmdText As String, ByVal ParamArray commandParameters As SqlParameter()) As Object
Dim cmd As SqlCommand = New SqlCommand
PrepareCommand(cmd, connection, Nothing, cmdType, cmdText, commandParameters)
Dim val As Object = cmd.ExecuteScalar()
cmd.Parameters.Clear()
Return val
End Function
''' <summary>
''' add parameter array to the cache
''' </summary>
''' <param name="cacheKey"></param>
''' <param name="commandParameters">an array of SqlParamters to be cached</param>
''' <remarks></remarks>
Public Shared Sub CacheParameters(ByVal cacheKey As String, ByVal ParamArray commandParameters As SqlParameter())
parmCache(cacheKey) = commandParameters
End Sub

Public Shared Function GetCachedParameters(ByVal cacheKey As String) As SqlParameter()
Dim cachedParms As SqlParameter() = CType(parmCache(cacheKey), SqlParameter())
If cachedParms Is Nothing Then Return Nothing
Dim clonedParms(cachedParms.Length - 1) As SqlParameter
Dim i As Integer
For i = 0 To cachedParms.Length - 1
clonedParms(i) = CType(CType(cachedParms(i), ICloneable).Clone(), SqlParameter)
Next
Return clonedParms
End Function
''' <summary>
'''
''' </summary>
''' <param name="cmd"></param>
''' <param name="conn"></param>
''' <param name="trans"></param>
''' <param name="cmdType"></param>
''' <param name="cmdText"></param>
''' <param name="cmdParms"></param>
''' <remarks></remarks>
Private Shared Sub PrepareCommand(ByVal cmd As SqlCommand, ByVal conn As SqlConnection, ByVal trans As SqlTransaction, ByVal cmdType As CommandType, ByVal cmdText As String, ByVal cmdParms As SqlParameter())
If conn.State <> ConnectionState.Open Then conn.Open()
cmd.Connection = conn
cmd.CommandText = cmdText
If trans IsNot Nothing Then cmd.Transaction = trans
cmd.CommandType = cmdType
If cmdParms IsNot Nothing Then
Dim parm As SqlParameter
For Each parm In cmdParms
cmd.Parameters.Add(parm)
Next
End If
End Sub
End Class