Question

请教大神mybatis select数据一直报错，update,delete,insert数据都成功

Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:

### Error querying database. Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class cn.t.entity.User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: cn.t.entity.User.<init>()

### The error may exist in cn/t/entity/UserMapper.xml

### The error may involve cn.t.domain.UserInterface.getUser-Inline

### The error occurred while setting parameters

### SQL: select id,name,password,email,address from user where id=?

### Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class cn.t.entity.User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: cn.t.entity.User.<init>()

at cn.t.test.testUse.main(testUse.java:29)

Caused by: java.lang.NoSuchMethodException: cn.t.entity.User.<init>()

at java.lang.Class.getConstructor0(Class.java:2810)

at java.lang.Class.getDeclaredConstructor(Class.java:2053)

at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:57)

... 22 more万分感谢

Answer 1

报的是没有方法异常， 那就要看看你是否有select， 查询数据的方法啊， 你既然说修改，插入，删除都成功， 那只有查询不成功， 报的也是没有方法异常， 就去看看有没有这个方法。