VB6 - 如何在一次调用中执行多个SQL查询

Posted 2021-04-17

我在VB6中有一个旧的慢程序，使用ADO在许多调用中运行许多sql查询。它花了太多时间。我想测试是否在一个查询中发送所有查询（大多数只是更新或插入）以节省网络和调用时间。我该如何实现这一点，并建议是否可以节省时间并提高性能？

    qry = "Update table1 Set col1 = 'eerere' Where 1=1"
    qry = qry & vbCrLf & "  AND MyID = " & MyID & vbCrLf
    ExecSQL qry, DBCon, adAsyncExecute

    qry = "Insert Into TableMain"
    qry = qry & "Select  col1,col2,col3 from Table2 Where 1=1"
    qry = qry & vbCrLf & "  AND MyID = " & MyID & vbCrLf
    ExecSQL qry, DBCon, adAsyncExecute

    qry = "Update table5 Set col1 = 'eerere' Where 1=1"
    qry = qry & vbCrLf & "  AND MyID = " & MyID & vbCrLf
    ExecSQL qry, DBCon, adAsyncExecute

答案

您可以通过用分号分隔命令将它们组合成一个调用：

qry = "Update table1 Set col1 = 'eerere' Where 1=1"
qry = qry & vbCrLf & "  AND MyID = " & MyID & "; " & vbCrLf

qry = qry & "Insert Into TableMain"
qry = qry & "Select  col1,col2,col3 from Table2 Where 1=1"
qry = qry & vbCrLf & "  AND MyID = " & MyID & "; " & vbCrLf

如果它不会导致任何错误，它可能会给你一些小的性能提升。