Question

我想要一个纯SQL查询来插入或更新多行。我开始工作一个，但只有一行：

WITH UPDATED_ITEMS as (
  UPDATE table SET (columnC, columnD) = ($value3, $value4) WHERE id = $value5 returning *
)
INSERT INTO table (columnA, columnB, columnC, columnD) SELECT $value1, $value2, $value3, $value4 WHERE NOT EXISTS (SELECT * FROM updated_items)

现在我已经更改了更新条件，但是不知道如何使用insert进行更新：

WITH updated_items as (
  UPDATE table as m SET
    columnC = c.columnC
    columnD = c.columnD
from (values ($value3, $value4, $value5), ($value8, $value9, $value10)
) as c(columnC, columnD, id)
where c.id::int4 = m.id returning *
)
INSERT INTO table (columnA, columnB, columnC, columnD)
SELECT ($value1, $value2, $value3, $value4, $value5), ($value6, $value7, $value8, $value9, $value10) WHERE NOT EXISTS (SELECT * FROM updated_items)

但是插入部分不起作用。有人请帮忙吗？

Answer 1

我认为你基本上需要not exists中的关联条款。您的更新引用了id列，因此我也添加了该列。所以我认为这样做你想要的：

WITH updated_items as (
  UPDATE table as m
    SET columnC = c.columnC,
        columnD = c.columnD
    FROM (VALUES ($value3, $value4, $value5),
                 ($value8, $value9, $value10)
         ) as c(columnC, columnD, id)
    WHERE c.id::int4 = m.id 
    RETURNING *
   )
INSERT INTO table (columnA, columnB, columnC, columnD)
    SELECT columnA, columnB, columnC, columnD
    FROM (VALUES ($value1, $value2, $value3, $value4, $value5), 
                 ($value6, $value7, $value8, $value9, $value10)
         ) c(columnA, columnB, columnC, columnD, id)
    WHERE NOT EXISTS (SELECT 1 FROM updated_items ui WHERE ui.id = c.id::int);

如果没有为多行插入，则组合更新

1 个答案: