1 详细的异常信息

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 'LIMIT 30' at line 1

at sun.reflect.GeneratedConstructorAccessor162.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

at com.mysql.jdbc.Util.getInstance(Util.java:408)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:944)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)

at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)

at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2486)

at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858)

at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1197)

at com.zaxxer.hikari.pool.ProxyPreparedStatement.execute(ProxyPreparedStatement.java:44)

at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.execute(HikariProxyPreparedStatement.java)

at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:63)

at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)

at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)

at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)

at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)

at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)

at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:136)

at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)

at com.sun.proxy.$Proxy175.query(Unknown Source)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)

at sun.reflect.GeneratedMethodAccessor109.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)

... 74 common frames omitted

2 自己看了下详细的代码

自己拼接的sql 已经有了一个limit 20 但是 后面执行的时候，又追加了limit 30.

3 原因分析

这种情况下，只有开启了pageHelper插件的start方法，才可能出现

但是在我的这段代码中，我并没有这样做，怀疑是不是代码污染了，暂时也没有找到原因。

4 解决方法

暂时去掉了自己写的limit 20 ，暂时绕过这个问题。有时候，无法在规定时间解决问题的时候，暂时绕过不耽误整个项目的进程，也是可取的。