mjywm的博客

因为数据库中表-设计表-选项-引擎选择的是innodb支持事务，所以代码insert,delete,update后要提交事务mapper.update(product);sqlSession.commit();如果引擎默认选择的是MyISAM是不支持事务的，所以不提交事务，数据库也会改变...

com.alibaba.fastjson.JSONException: exepct '[', but error, pos 1, json : redis调用失败 我的原因是redis服务没有启动cmd 运行redis和它的配置文件

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 null,10at line 5 at sun.reflect.NativeConstruct...

java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for wf.source.crm.mapper.找不到这个映射器 可能是编译出问题， idea中，delete target文件夹 然后 选中项目 右键 rebuild module重新编译一下...

A query was run and no Result Maps were found for the Mapped Statement 'cn.itsource.hello.mapper.ProductMapper.selectForList'. It's likely that neither a Result Type nor a Result Map was specified.原因是ProductMapper.xml中的selectForList方法里没有写resultMap...

HTTP Status 500 - Could not write content: Direct self-reference leading to cycle (through reference chain: java.util.ArrayList[6]->cn.itsource.domain.Producttype["parent"]); nested exception is co...