获取记录集、执行SQL语句、记录读取

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'**********************************************************
'以下为vb类的代码,实现获取记录集、执行SQL语句、记录读取（可以作为登录验证用）
Imports Microsoft.VisualBasic
Imports System.Data

Public Class readdata
Public conn As SqlClient.SqlConnection
Public Function data()

        conn = New SqlClient.SqlConnection("Data Source=(local);Initial Catalog=test;Persist Security Info=false;integrated security=sspi")
        If conn.State = ConnectionState.Open Then
            conn.Close()
        End If

    End Function
'------------------------------------------------------------------------------
    Public Function getdataset(ByVal sql As String) As System.Data.DataSet
        Dim sl As New Data.DataSet
        Try
            Call data()
            conn.Open()
            Dim sda As New SqlClient.SqlDataAdapter(sql, conn)
            sda.Fill(sl)
            Return sl
        Catch ex As Exception
            MsgBox("Error")

        End Try
        'conn.Close()
    End Function
'-----------------------------------------------------------------------------------
    Public Function execsql(ByVal sql As String) As Integer

Try
Call data()

Dim sqlcmd As SqlClient.SqlCommand = New SqlClient.SqlCommand(sql, conn)

            conn.Open()
            Return sqlcmd.ExecuteNonQuery
        Catch ex As Exception
            MsgBox("Error_ExEc")
        End Try
        'conn.Close()
    End Function
'---------------------------------------------------------------------------------
    Public Function readsql(ByVal sql As String) As SqlClient.SqlDataReader

Try
Call data()

            Dim sqlcmd As SqlClient.SqlCommand = New SqlClient.SqlCommand(sql, conn)
            conn.Open()
            Return sqlcmd.ExecuteReader

        Catch ex As Exception
            MsgBox("Error_ExEc")
        End Try
        'conn.Close()
    End Function