Mybatis-Plus主键插入null值报错

Mysql数据库主键对应的实体类属性id只要插入null

就会报如下错误：

org.apache.ibatis.exceptions.PersistenceException: 
### Error updating database.  Cause: org.apache.ibatis.reflection.ReflectionException: Could not set property 'id' of 'class com.entity.Student' with value '1281212463907368960' Cause: java.lang.IllegalArgumentException: argument type mismatch
### Cause: org.apache.ibatis.reflection.ReflectionException: Could not set property 'id' of 'class com.entity.Student' with value '1281212463907368960' Cause: java.lang.IllegalArgumentException: argument type mismatch
    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:200)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:185)
    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:57)
    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
    at com.sun.proxy.$Proxy5.save(Unknown Source)
    at com.baizhi.service.Impl.StudentServiceImpl.save(StudentServiceImpl.java:59)
    at Testdao.TestService(Testdao.java:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.apache.ibatis.reflection.ReflectionException: Could not set property 'id' of 'class com.entity.Student' with value '1281212463907368960' Cause: java.lang.IllegalArgumentException: argument type mismatch
    at org.apache.ibatis.reflection.wrapper.BeanWrapper.setBeanProperty(BeanWrapper.java:185)
    at org.apache.ibatis.reflection.wrapper.BeanWrapper.set(BeanWrapper.java:59)
    at org.apache.ibatis.reflection.MetaObject.setValue(MetaObject.java:140)
    at com.baomidou.mybatisplus.MybatisDefaultParameterHandler.populateKeys(MybatisDefaultParameterHandler.java:175)
    at com.baomidou.mybatisplus.MybatisDefaultParameterHandler.processBatch(MybatisDefaultParameterHandler.java:119)
    at com.baomidou.mybatisplus.MybatisDefaultParameterHandler.<init>(MybatisDefaultParameterHandler.java:79)
    at com.baomidou.mybatisplus.MybatisXMLLanguageDriver.createParameterHandler(MybatisXMLLanguageDriver.java:37)
    at org.apache.ibatis.session.Configuration.newParameterHandler(Configuration.java:532)
    at org.apache.ibatis.executor.statement.BaseStatementHandler.<init>(BaseStatementHandler.java:69)
    at org.apache.ibatis.executor.statement.PreparedStatementHandler.<init>(PreparedStatementHandler.java:40)
    at org.apache.ibatis.executor.statement.RoutingStatementHandler.<init>(RoutingStatementHandler.java:46)
    at org.apache.ibatis.session.Configuration.newStatementHandler(Configuration.java:545)
    at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:48)
    at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)
    at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:198)
    ... 28 more
Caused by: java.lang.IllegalArgumentException: argument type mismatch
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.ibatis.reflection.invoker.MethodInvoker.invoke(MethodInvoker.java:41)
    at org.apache.ibatis.reflection.wrapper.BeanWrapper.setBeanProperty(BeanWrapper.java:180)
    ... 43 more

经过重重排除确定是Mysql的自增主键对应的实体类属性不能是null值，要想插入null值，需要在主键对应的实体类属性上加自增注解

 @TableId(type = IdType.AUTO)
    private Integer id;

（记录一下使用Mybatis-Plus中碰到的坑，另外button会自动提交表单一直刷新页面，让我的局部刷新操作失效，这两个坑花了我大半个晚上解决。。。）

mybatis插入数据传入值为null时提示无效的列类型

原因：mybatis无法解析值的类型

方法一

因为无法解析null为何种类型，可对传入值在xml中指定类型，如下

<insert id="batchInsertQuestion" useGeneratedKeys="false">
        insert all
        <foreach collection="list" item="item" index="index">
            into ZB_APPRAISE_RECORD_QUESTION (id, record_id, question_name, sort_no, created_by, created_time,
            modified_by,
            modified_time,option_type,appraise_id)
            values
            (#{item.id},#{item.recordId},#{item.questionName,jdbcType=varchar},#{item.sortNo},#{item.createdBy},#{item.createdTime},#{item.modifiedBy},#{item.modifiedTime},#{item.optionType},#{item.appraiseId})
        </foreach>
        select 1 from dual
    </insert>

方法二

在mybatis-config.xml配置文件中配置：

<?xml version=”1.0” encoding=”UTF-8” ?>
<!DOCTYPE configuration PUBLIC “-//mybatis.org//DTD Config 3.0//EN” “http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
…
<settings>
<setting name="jdbcTypeForNull" value="NULL" />
</settings>
…
</configuration>

springboot yml配置方法如下

mybatis-plus:
  configuration:
    jdbc-type-for-null: 'null' #注意：单引号

总结

以上为个人经验，希望能给大家一个参考，也希望大家多多支持寻技术。