Question

我执行了以下声明，但它只更新除Assasin信条之外的所有价格行（空白值）。此外，我的表格中其他行中未明确定义的价格被清除（空白值）。如果我更新2个产品，它似乎正常工作。可能有什么不对？

（仅用于展示包装的换行符）

"UPDATE Products SET Price = IIf(Product = 'Crysis Wars'," +
CrysisWarsInput.Text +
", IIf(Product = 'Far Cry 2'," + FarCry2Input.Text +
", IIf(Product = 'Day of Defeat Source'," + DODSourceInput.Text +
", IIf(Product = 'GTA 4'," + GTA4Input.Text +
", IIf(Product = 'Asassins Creed'," + AssassinsCreedInput.Text + ")))))";

Answer 1

也许是因为你错误地拼写了“Assasins Creed”？设置WHERE子句，或在最后一个IIF中添加Price作为默认值

"UPDATE Products SET Price = " +
"  IIf(Product = 'Crysis Wars',"          + CrysisWarsInput.Text +
", IIf(Product = 'Far Cry 2',"            + FarCry2Input.Text +
", IIf(Product = 'Day of Defeat Source'," + DODSourceInput.Text +
", IIf(Product = 'GTA 4',"                + GTA4Input.Text +
", IIf(Product = 'Assasins Creed',"       + AssassinsCreedInput.Text + ", Price)))))";

我表格中未定义的其他行

这是WHERE子句的用途，用于限制要更新的记录。

"UPDATE Products SET Price = " +
"  IIf(Product = 'Crysis Wars',"          + CrysisWarsInput.Text +
", IIf(Product = 'Far Cry 2',"            + FarCry2Input.Text +
", IIf(Product = 'Day of Defeat Source'," + DODSourceInput.Text +
", IIf(Product = 'GTA 4',"                + GTA4Input.Text +
", "                                      + AssassinsCreedInput.Text + ")))) +
" WHERE Product in ('Crysis Wars','Far Cry 2','Day of Defeat Source'," +
"  'GTA 4','Assasins Creed')";

您也可以使用SWITCH statement代替多个IIF。

Answer 2

Re assasins信条 - 可能是一个错字。仔细查看单元格和查询中的值 - 例如，它是刺客与刺客吗？

重新启动其他人（不在查询中）;你需要添加一个“where”子句，否则它适用于表中的每一行;这就是SQL的工作方式......我猜这里的IN过滤器最好。 Fr示例

where Product in ('some title', 'another title', ...)

SQL Update语句（MS ACCESS）

2 个答案: