图书管理系统：代码示例与执行操作

 Public Function ConnectString() As String
        ConnectString = "data Source = NETWORKA3\SQLEXPRESS;Initial Catalob = Sales;User ID = chy;Password = chy;"
    End Function
    Public txtSQL As String
    Public DBSet As DataSet
    Public ErrorMsg As String
    Public Function ExecuteSQL(ByVal STRsql As String, ByRef errMsg As String) As Integer
        Dim cnn As SqlClient.SqlConnection
        Dim cmd As New SqlClient.SqlCommand()
        Dim adpt As SqlClient.SqlDataAdapter
        Dim rst As New DataSet()
        Dim SplitSQL() As String
        errMsg = ""
        Try
            SplitSQL = Split(STRsql)
            cnn = New SqlClient.SqlConnection(ConnectString())
            If InStr("insert,delete,update", UCase(SplitSQL(0))) Then
                cmd.Connection = cnn
                cmd.Connection.Open()
                cmd.CommandText = STRsql
                ExecuteSQL = cmd.ExecuteNonQuery()
            Else
                adpt = New SqlClient.SqlDataAdapter(STRsql, cnn)
                adpt.Fill(rst)
                ExecuteSQL = rst.Tables(0).Rows.Count
                DBSet = rst
            End If
        Catch ex As Exception
            errMsg = ex.Message
            ExecuteSQL = -1