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, _dbConn)
End Select If Name = "" Then
DataSource = New DataSet
Else
DataSource = New DataSet(Name)
End If If Schema Then Ds.FillSchema(DataSource, SchemaType.Source)
Ds.Fill(DataSource)
End Get
End Property
End Class ''''命令行类
Public Class Command
Private _Cmd As IDbCommand
Private _Sql As String
Private _Conn As IDbConnection
Private _rdr As IDataReader
Private _dbType As ConnectionType Public Sub New(ByRef Connect As IDbConnection)
_Conn = Connect
If TypeOf Connect Is OleDb.OleDbConnection Then
_dbType = ConnectionType.OleDb
ElseIf TypeOf Connect Is SqlClient.SqlConnection Then
_dbType = ConnectionType.SqlServer
End If
End Sub Public Sub New(ByRef Connect As IDbConnection, ByVal Sql As String)
_Conn = Connect
If TypeOf Connect Is OleDb.OleDbConnection Then
_dbType = ConnectionType.OleDb
ElseIf TypeOf Connect Is SqlClient.SqlConnection Then
_dbType = ConnectionType.SqlServer
End If
Me.Sql = Sql
End Sub Protected Overrides Sub Finalize()
Try
_Cmd.Dispose()
_rdr.Dispose()
_Conn.Dispose()
Catch ex As Exception
Finally
MyBase.Finalize()
End Try
End Sub ''''设置或返回连接对象
Public Property Connect() As IDbConnection
Get
Return _Conn
End Get
Set(ByVal Value As IDbConnection)
_Conn = Value
End Set
End Property ''''读取或设置SQL语句
Public Property Sql() As String
Get
Return _Sql
End Get
Set(ByVal Value As String)
_Sql = Value
If _dbType = ConnectionType.SqlServer Then
_Cmd = New SqlClient.SqlCommand(Sql, _Conn)
Else
_Cmd = New OleDb.OleDbCommand(_Sql, _Conn)
End If
End Set
End Property ''''读取下一记录行，如果记录集没有打开，则自动打开。
Public Function Read(Optional ByVal Behavior As System.Data.CommandBehavior = CommandBehavior.Default) As Boolean
If _rdr Is Nothing Then
Try
_rdr = _Cmd.ExecuteReader(Behavior)
Return _rdr.Read
Catch ex As Exception
Return False
End Try
Return False
Else
Return _rdr.Read
End If
End Function ''''//返回字段数
Public Function FieldCount() As Integer
Try
Return _rdr.FieldCount
Catch ex As Exception
Return 0
End Try
End Function ''''//执行命令
Public Function Update() As Boolean
Try
If _Conn.State <> ConnectionState.Open Then
_Conn.Open()
End If
_Cmd.ExecuteNonQuery()
Return True
Catch ex As Exception
Throw ex
Return False
End Try
End Function ''''//读取字段或添加SQL的命名参数
Default Public Property Item(ByVal Name As String)
Get
Return _rdr(Name)
End Get
Set(ByVal Value)
AddParam(Value, Name)
End Set
End Property ''''//读取字段
Default Public ReadOnly Property Item(ByVal Index As Integer)
Get
Return _rdr(Index)
End Get
End Property ''''//添加参数
Public Function AddParam(ByRef Value As Object, Optional ByVal Name As String = "")
If _dbType = ConnectionType.OleDb Then
Return CType(_Cmd, OleDb.OleDbCommand).Parameters.Add(Name, Value)
Else
Return _Cmd.Parameters.Add(New SqlClient.SqlParameter("@" & Name, Value))
End If
End Function
End Class
End Namespace
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