MYSQL 使用双引号和单引号时截断了不正确的 DOUBLE

Question

我创建了一个触发器，它在 table 中插入一行，然后在另一个 table 中删除一行。

这是我的触发器

CREATE TRIGGER trigger_delete_log_animal AFTER delete ON animal
FOR EACH ROW
    INSERT INTO log_animais (momento, ocorrencia)
    VALUES (now(), "The register '" + old.nome_animal + "' was deleted from the animal table");

我希望nome_animal在单引号之间。

但是当我从动物中删除一行时出现以下错误table:

Error Code: 1292. Truncated incorrect DOUBLE value: 'The register ''

我试过将其更改为

'The register "' + old.nome_animal + '" was deleted from the animal table'

还有

"The register \'" + old.nome_animal + "\' was deleted from the animal table"

但是不行

我做错了什么？

Answer 1

不要尝试在 SQL 代码中使用 + 构建字符串。

改用CONCAT()：

 VALUES (now(), CONCAT(
           'The register \'', 
            old.nome_animal, 
            '\' was deleted from the animal table'));

然后，使用 \.

转义字符串中的 ' 个字符

'Mrs. O\'Leary\'s cow.'

MYSQL 使用双引号和单引号时截断了不正确的 DOUBLE

MYSQL Truncated incorrect DOUBLE while using double and single quotation marks

mysql

triggers

quotation-marks

mysql-error-1292