在单个 SQL Server 查询中更新多行 - 在 VBA 中 [英] Update multiple rows in a single SQL Server query - in VBA

问题描述

我正在使用 VBA 通过以下代码更新 Access 数据库:

I am using VBA to update an Access database with the following code:

For i = 1 To imax
    strSql = "UPDATE Products SET Price ='" & vArray(i, 2) & "' WHERE ID = '" &   vArray(i, 1) & "';"
    connDB.Execute (strSql)
Next i

这可行，但可能会很慢，因为有 5,000 到 10,000 行要更新(imax).

That works but can be very slow since there are between 5,000 and 10,000 rows to update (imax).

有没有办法改用单个 SQL 语句?

Is there a way to use a single SQL statement instead?

我在下面尝试了 Jatin 的建议.不幸的是，它并没有在我身边飞行(尝试下面的前三行):

I've tried Jatin's suggestion below. Unfortunately it doesn't fly on my side (a try on the first three rows below):

UPDATE p SET p.Price = x.SetValue FROM Products p INNER JOIN (
SELECT '149' AS SetValue, 'P100005' AS WhereValue  UNION ALL 
SELECT '129' AS SetValue, 'P100001' AS WhereValue  UNION ALL 
SELECT '99' AS SetValue, 'P100002' AS WhereValue  ) AS x ON p.ID = x.WhereValue;

推荐答案

我不是 VBA 专家，但像下面这样的东西可以完成任务.

I am not expert to VBA, but something like below will do the task.

strValues = "INNER JOIN (VALUES "
For i = 1 To imax    
    strValues = strValues & IIF(i = 1,"",",") & "('" & vArray(i, 2) & "', '" & vArray(i, 1) & "')"
Next i
strValues = strValues & " ) AS x(SetValue, WhereValue) ON p.ID = x.WhereValue "
strSql = "UPDATE p SET p.Price = x.SetValue FROM Products p " & strValues
connDB.Execute (strSql)

下面是另一种解决方案，它使用 UNION ALL 构建值表.

below is an alternate solution, it builds value table with UNION ALL.

strValues = "INNER JOIN ("
For i = 1 To imax    
    strValues = strValues & vbCrLf & "SELECT '" & vArray(i, 2) & "' AS SetValue, '" & vArray(i, 1) & "' AS WhereValue " & IIF(i = imax,""," UNION ALL ") 'skip Union All for last entry
Next i
strValues = strValues & " ) AS x ON p.ID = x.WhereValue "
strSql = "UPDATE p SET p.Price = x.SetValue FROM Products p " & strValues
connDB.Execute (strSql)

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