目录

报错信息

控制台输出

自研结果

解决办法

总结

整体问题就是sql语法问题，导致的。下面是报错信息、控制台输出、自研结果、解决办法、总结。

报错信息

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 'false as user_name1, false as user_name2, true as user_name3, true as user_name4, true as user_name4' at line 1

控制台输出

"\r\n### Error querying database. Cause: java.sql.SQLSyntaxErrorException: 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 'false as user_name1, false as user_name2, true as user_name3, true as user_name4, true as user_name4' at line 1\r\n### The error may exist in file [C:\\tmp\\idea-jdk\\BIIP\\iot-develops\\iot-develops-biz\\target\\classes\\mapper\\InspectionContentMapper.xml]\r\n### The error may involve defaultParameterMap\r\n### The error occurred while setting parameters\r\n### SQL: select false as user_name1, false as user_name2, true as user_name3, true as user_name4, true as user_name4 from user\r\n### Cause: java.sql.SQLSyntaxErrorException: 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 'false as user_name1, false as user_name2, true as user_name3, true as user_name4, true as user_name4' at line 1\n; bad SQL grammar []"

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 'false as user_name1, false as user_name2, true as user_name3, true as user_name4, true as user_name4' at line 1

自研结果

从错误信息可以看出，SQL 语句的语法错误出在 **`user_name1` 字段后缺少逗号**，导致后续的常量值无法被正确解析。 ### 错误位置分析 原 SQL 中这部分存在语法问题：

```sql user_name1 false as user_name1 -- 两处之间缺少逗号 ``` `user_name1 false as user_name1` 与 `user_name2 false as user_name2` 是两个独立的查询项，但中间没有用逗号分隔，导致 MySQL 无法识别语法。

解决办法

### 修正后的 SQL（核心部分） ```sql select user_name1 false as user_name1 , -- 此处添加逗号 user_name2 false as user_name2  ... -- 后续表连接和条件不变 ``` ### 修正说明 在 `user_name1 false as user_name1` 后面添加一个逗号 `,`，将其与后面的 `user_name2 false as user_name2 分隔开，

总结

确保每个查询项之间用逗号正确分隔。 这是 SQL 编写中常见的细节错误，多个字段或表达式并列时，必须用逗号分隔，否则会导致语法解析失败。修正后，语句即可正常执行。