SQL - IF EXISTS UPDATE ELSE INSERT语法错误

Question

我有以下SQL查询:

IF EXISTS(SELECT * FROM component_psar WHERE tbl_id = '2' AND row_nr = '1') 
   UPDATE component_psar
      SET col_1 = '1', col_2 = '1', col_3 = '1', col_4 = '1', col_5 = '1',
                 col_6 = '1', unit = '1', add_info = '1', fsar_lock = '1' 
    WHERE tbl_id = '2' AND row_nr = '1' 
ELSE 
    INSERT INTO component_psar (tbl_id, row_nr, col_1, col_2, col_3, col_4,
                                col_5, col_6, unit, add_info, fsar_lock)
    VALUES ('2', '1', '1', '1', '1', '1', '1', '1', '1', '1', 'N')

忽略我试图将每列设置为'1'的事实.这只是示例数据.:)

无论如何,执行此查询会返回语法错误:

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your
     MySQL server version for the right syntax to use near 'IF EXISTS(SELECT * FROM
     component_psar WHERE tbl_id = '2' AND row_nr = '1') UP' at line 1

我一直盯着它,在互联网上搜索了半个小时,但却找不到这个假设的语法错误.这可能最终会让我感到非常愚蠢,但我可以在这个问题上帮助你们.

Answer 1

INSERT INTO component_psar (tbl_id, row_nr, col_1, col_2, col_3, col_4, col_5, col_6, unit, add_info, fsar_lock)
VALUES('2', '1', '1', '1', '1', '1', '1', '1', '1', '1', 'N')
ON DUPLICATE KEY UPDATE col_1 = VALUES(col_1), col_2 = VALUES(col_2), col_3 = VALUES(col_3), col_4 = VALUES(col_4), col_5 = VALUES(col_5), col_6 = VALUES(col_6), unit = VALUES(unit), add_info = VALUES(add_info), fsar_lock = VALUES(fsar_lock)

可以使用tbl_id和row_nr拥有UNIQUE密钥.

这是DocJonas与示例链接的方法.

Answer 2

这是文档INSERT ... ON DUPLICATE语句的链接.

Answer 3

你必须添加 THEN

IF EXISTS(SELECT * FROM component_psar WHERE tbl_id = '2' AND row_nr = '1') 
THEN
UPDATE component_psar SET col_1 = '1', col_2 = '1', col_3 = '1', col_4 = '1', col_5 = '1', col_6 = '1', unit = '1', add_info = '1', fsar_lock = '1' WHERE tbl_id = '2' AND row_nr = '1' 
ELSE 
INSERT INTO component_psar (tbl_id, row_nr, col_1, col_2, col_3, col_4, col_5, col_6, unit, add_info, fsar_lock) VALUES('2', '1', '1', '1', '1', '1', '1', '1', '1', '1', 'N')