org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:

【MyBatisSystemException 】Caused by: net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "ur" <K_ISOLATION>

### Error querying database.  Cause: com.baomidou.mybatisplus.core.exceptions.MybatisPlusException: Failed to process, Error SQL: SELECT DISTINCT
        u.id,
        u.username,
        u.nickname,
        u.dept_id,
        u.email,
        u.mobile
        FROM
        system_users u
        LEFT JOIN system_dept d ON u.dept_id = d.id
        LEFT JOIN system_user_role ur ON u.id = ur.user_id
        LEFT JOIN system_role r ON r.id = ur.role_id
        WHERE
        u.deleted = 0
### Cause: com.baomidou.mybatisplus.core.exceptions.MybatisPlusException: Failed to process, Error SQL: SELECT DISTINCT
        u.id,
        u.username,
        u.nickname,
        u.dept_id,
        u.email,
        u.mobile
        FROM
        system_users u
        LEFT JOIN system_dept d ON u.dept_id = d.id
        LEFT JOIN system_user_role ur ON u.id = ur.user_id
        LEFT JOIN system_role r ON r.id = ur.role_id
        WHERE
        u.deleted = 0
	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:96)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:441)
	at com.sun.proxy.$Proxy139.selectList(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:224)
	at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.executeForMany(MybatisMapperMethod.java:166)
	at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:77)
	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy$PlainMethodInvoker.invoke(MybatisMapperProxy.java:148)
	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:89)
	at com.sun.proxy.$Proxy193.selectAllocatedList(Unknown Source)
......
	at com.baomidou.mybatisplus.core.toolkit.ExceptionUtils.mpe(ExceptionUtils.java:39)
	at com.baomidou.mybatisplus.extension.parser.JsqlParserSupport.parserSingle(JsqlParserSupport.java:52)
	at com.baomidou.mybatisplus.extension.plugins.inner.TenantLineInnerInterceptor.beforeQuery(TenantLineInnerInterceptor.java:65)
	at com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor.intercept(MybatisPlusInterceptor.java:78)
	at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:62)
	at com.sun.proxy.$Proxy158.query(Unknown Source)
	at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:132)
	at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:62)
	at com.sun.proxy.$Proxy158.query(Unknown Source)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:151)
	... 184 common frames omitted
Caused by: net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "ur" <K_ISOLATION>
    at line 11, column 36.

Was expecting one of:

    ";"
    "ACTION"
    "ACTIVE"
    "ALGORITHM"
    "ARCHIVE"
    "ARRAY"
    "AS"
    "AT"
    "BYTE"
    "CASCADE"
    "CASE"
    "CAST"
    "CHANGE"
    "CHAR"
    "CHARACTER"
    "CHECKPOINT"
    "COLUMN"
    "COLUMNS"
    "COMMENT"
    "COMMIT"
    "CONNECT"
    "COSTS"

【问题】sql在mysql中能执行，但通过mybatisplus就报错

【原因】经过排查，竟然是mybatisplus执行sql的别名冲突！！！

 开始通过报错还不相信，这个 ur 竟然在mybatisplus中运行不了 | ToT |

【解决】更换成别的别名