Public Class ClassDB

Public cn As System.Data.sqlClient.sqlConnection
Public da As System.Data.sqlClient.sqlDataAdapter
Public ds As New DataSet
Public dt As New DataTable
Public cmd As System.Data.sqlClient.sqlCommand
'****************************************************************************************
'连接数据库
Public Function ConnectionOpen(ByVal uid As String,ByVal pwd As String,ByVal DBName As String,ByVal server As String) As Boolean
Dim cnstr As String = _
"Persist Security Info=False;" _
& "User ID=" & uid & ";Password=" & pwd & ";" _
& "Initial Catalog=" & DBName & ";" _
& "Server=" & server
cn = New System.Data.sqlClient.sqlConnection(cnstr)
Try
cn.Open()
Catch ex As System.Data.sqlClient.sqlException
MsgBox(ex.Message.ToString())
End Try
End Function
'断开数据库的连接
Public Function ConnectionClose() As Boolean
Try
cn.Close()
Catch ex As System.Data.sqlClient.sqlException
MsgBox(ex.Message.ToString())
End Try
End Function
'插入记录、删除记录、更新记录到指定的数据库->数据表
Public Function InsertDelUpdateRecord(ByVal cmdText As String) As Boolean
Try
cmd = New System.Data.sqlClient.sqlCommand(cmdText,cn) '指定sql命令及该命令用于哪一个数据库连接
cmd.ExecuteNonQuery()
Catch ex As Exception
MsgBox(ex.Message.ToString())
End Try
End Function
'填充数据集，他会根据cmdtext参数说指定的查询返回数据库里特定的表
Public Function DataSetFill(ByVal cmdText As String,ByVal tabName As String) As Boolean
Try
cmd = New System.Data.sqlClient.sqlCommand(cmdtext,cn) '指定SQL查询命令及该命令用于哪一个数据库连接
da = New System.Data.sqlClient.sqlDataAdapter(cmd)
da.Fill(ds,tabName) '表名可以映射为数据库中实际的表名称，但是他和数据库实际的表名称不是一回事
Catch ex As Exception
MsgBox(ex.Message.ToString())
End Try
End Function
'调用存储过程
Public Function ExecProc(ByVal procName As String,ByVal tabName As String) As Boolean
Try
cmd = New System.Data.sqlClient.sqlCommand(procName,cn)
cmd.CommandType = CommandType.StoredProcedure
da = New System.Data.sqlClient.sqlDataAdapter(cmd)
da.Fill(ds,tabName)
Catch ex As Exception
MsgBox(ex.Message.ToString())
End Try
End Function
'这个基本不用，因为可以直接通过ds来调用
Public Function DataTableFill(ByVal index As Integer) As Boolean
Try
dt = ds.Tables(index)
Catch ex As Exception
MsgBox(ex.Message.ToString())
End Try
End Function
'这个基本不用，因为可以直接通过ds来调用
Public Function DataTableFill(ByVal name As String) As Boolean
Try
dt = ds.Tables(name)
Catch ex As Exception
MsgBox(ex.Message.ToString())
End Try
End Function
'释放资源 Public Function DBDispos() As Boolean Try cn.Dispose() 'da.Dispose() ds.Dispose() dt.Dispose() Catch ex As Exception MsgBox(ex.Message.ToString()) End Try End FunctionEnd Class