mybatis的常见错误
mybatis错误
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- 错误原因：参数匹配不上
- 错误原因：找不到资源映射器
- 错误原因：找不到注册文件
- 错误原因：找不到驱动名称
- 错误原因：找不到方法，方法名错误
- 错误原因：没有返回类型
- 错误原因：数据库账号密码错误
- 错误原因：找不到表
- 错误原因：数据库时区错误
- 错误原因：没有找到文件
- 错误原因：未知原因
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org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.apache.ibatis.reflection.ReflectionException: Could not set property 'classId' of 'class com.zz.entity.Student' with value 'Clazz(cid=1, cname=bj_a, teacherId=1, teacher=null, students=null)' Cause: java.lang.IllegalArgumentException: argument type mismatch
### The error may exist in mapper/StudentMapper.xml
### The error may involve com.zz.dao.StudentDao.selectAllStudent
### The error occurred while handling results
### SQL: SELECT * from student,class where class_id=c_id and s_id=?
### Cause: org.apache.ibatis.reflection.ReflectionException: Could not set property 'classId' of 'class com.zz.entity.Student' with value 'Clazz(cid=1, cname=bj_a, teacherId=1, teacher=null, students=null)' Cause: java.lang.IllegalArgumentException: argument type mismatch
错误原因：参数匹配不上
解决方法：排查每个映射中的字段名是否对应
发现字段名没有对应，进行修改，错误解决
Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error building SqlSession.
### The error may exist in mapper/Clamapper
### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource mapper/Clamapper
错误原因：找不到资源映射器
解决方法：
1、排查是否在配置文件中配置需要加载的 sql 映射配置文件路径。
发现文件类型没有标注。修改文件后缀名为.xml，修改后错误解决
Exception in thread "main" org.apache.ibatis.binding.BindingException: Type interface com.aaa.qy129.dao.ClazzDao is not known to the MapperRegistry.
错误原因：找不到注册文件
解决方法：排查是否在config.xml文件注册了映射文件
发现未注册文件，进行注册文件
添加后错误解决
### Error querying database. Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: ${
jdbc.driverName}
### The error may exist in mapper/Clamapper.xml
### The error may involve com.aaa.qy129.dao.ClazzDao.findClassById
### The error occurred while executing a query
### Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: ${
jdbc.driverName}
错误原因：找不到驱动名称
解决方法：排查是否在config.xml添加db.properties文件
发现未添加db.properties文件，进行添加
添加后错误解决
Exception in thread "main" org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.aaa.qy129.dao.ClazzDao.findClassById
错误原因：找不到方法，方法名错误
解决方法：排查配置文件中的id方法名和dao接口中的方法名是否一致
发现使用错误的方法
进行修改后，错误解决。
Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.aaa.qy129.dao.ClazzDao.findClassById'. It's likely that neither a Result Type nor a Result Map was specified.
### The error may exist in mapper/Clamapper.xml
### The error may involve com.aaa.qy129.dao.ClazzDao.findClassById
### The error occurred while handling results
### SQL: select * from class c,teacher t,student s where c.teacher_id = t.t_id and c.c_id =s.class_id and c.c_id=?
### Cause: org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.aaa.qy129.dao.ClazzDao.findClassById'. It's likely that neither a Result Type nor a Result Map was specified.
错误原因：没有返回类型
解决方法：检查sql语句是否添加了resultMap
发现未添加返回类型，进行添加
再次运行，错误解决
Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
### The error may exist in mapper/Clamapper.xml
### The error may involve com.aaa.qy129.dao.ClazzDao.findClassById
### The error occurred while executing a query
### Cause: java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
错误原因：数据库账号密码错误
解决方法：在db.properties文件中设置正确的账号密码
Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'shop.class' doesn't exist
错误原因：找不到表
解决方法：排查是否使用了错误的数据库表
修改正确的数据库后，错误解决
org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
### The error may exist in mapper/ClassMapper.xml
### The error may involve com.zz.dao.ClassDao.findClassById
### The error occurred while executing a query
### Cause: java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
错误原因：数据库时区错误
解决方法：在url后面拼接serverTimezone=UTC
添加后，错误消失。
Exception in thread "main" java.io.IOException: Could not find resource mybatis-config.xml
错误原因：没有找到文件
解决方法：检查测试类是否使用了错误的名称
修改文件名，错误消失
记录一个奇葩bug
ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return code = -2
JDWP exit error AGENT_ERROR_NO_JNI_ENV(183): [util.c:840]
错误原因：未知原因
不影响运行结果，再次运行时就消失了，记录一下，如果有大佬知道给科普科普。
目前我知道的解决方法：重新跑一遍，就解决了