VB6 - 如何在一次调用中执行多个 SQL 查询

Question

我在 VB6 中有一个旧的慢过程，使用 ADO 在许多调用中运行许多 sql 查询。它花费了太多时间。我想测试是否在一个查询中发送所有查询(其中大多数只是更新或插入(以节省网络和调用时间。我如何实现这一点，并建议这是否会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

Answer 1

您可以通过用分号分隔命令将它们合并为一个调用：

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

如果不会导致任何错误，它可能会给您一些小的性能改进。