java column 设置非空,Column ‘列名’ cannot be null 问题解决

这个其实就是小错误，都怪自己的马虎。

它这里提示字段不能为空**，是因为数据库里加了非null约束。**

自己明明添加了数据，却没有进到数据库中。

我就检查了一下代码。

我这个是添加数据的方法，相信你们都能看出来吧，是的，没有返回值！！！

虽然很简单，但是这个错误我觉得很常犯。

写代码一定要找头脑清醒的时候写，不然只会给自己添麻烦！

org.springframework.dao.DataIntegrityViolationException:

Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:

Column ‘name’ cannot be null

The error may involve defaultParameterMap

The error occurred while setting parameters

SQL: INSERT INTO users (name,sex,email) VALUES (?,?,?);

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:

Column ‘name’ cannot be null ; SQL []; Column ‘name’ cannot be null;

nested exception is

com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:

Column ‘name’ cannot be null

org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:85)

org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)

org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)

org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:75)

org.mybatis.spring.SqlSessionTemplateSqlSessionInterceptor.invoke(SqlSessionTemplate.java:447)com.sun.proxy.SqlSessionInterceptor.invoke(SqlSessionTemplate.java:447) com.sun.proxy.SqlSessionInterceptor.invoke(SqlSessionTemplate.java:447)com.sun.proxy.Proxy9.insert(Unknown Source)

org.mybatis.spring.SqlSessionTemplate.insert(SqlSessionTemplate.java:279)

org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:57)

org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)

com.sun.proxy.$Proxy20.registerUser(Unknown Source)

com.myword.user.service.UserServiceImpl.registerUser(UserServiceImpl.java:28)

com.myword.user.controller.RedisController.registerUser(RedisController.java:32)

sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

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

java.lang.reflect.Method.invoke(Method.java:497)

org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)

org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)

org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)

org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:832)

org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:743)

org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)

org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961)

org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)

org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858)

javax.servlet.http.HttpServlet.service(HttpServlet.java:635)