springboot集成mybatis的mapper扩展

springboot集成mybatis的mapper扩展

我在看别人的demo的时候发现这个mapper相当方便，就学习学习

0.项目结构图

1.导入依赖

        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.2
        
        
        
            tk.mybatis
            mapper-spring-boot-starter
            1.1.1
        
        
        
            com.alibaba
            druid
            1.0.29
        
        
        
            mysql
            mysql-connector-java
            runtime
        
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
            
                
                org.mybatis.generator
                mybatis-generator-maven-plugin
                1.3.2
                
                    
                    
                        com.mysql
                        mysql
                        5.1.7
                    
                
                
                    
                    true
                    true
                
            
        
    

2.编写MyMapper.class

package com.xpf.util;


import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;
/*
 Mapper接口：基本的增、删、改、查方法
 MySqlMapper：针对MySQL的额外补充接口，支持批量插入
*/
public interface MyMapper extends Mapper , MySqlMapper {
    //TODO
    //FIXME 特别注意，该接口不能被扫描到，否则会出错
}

3.配置application.properties(注：每次修改后，启动运行，查看是否报错)

#数据库
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=123123
#mybatis
mybatis.type-aliases-package=com.xpf.entity
mybatis.mapper-locations=classpath:mapper/*.xml
mapper.mappers=com.xpf.util.MyMapper
mapper.not-empty=false
mapper.identity=MYSQL

4.添加对应的实体类，dao层 （mapper） 注： 可以使用注解sql,也可以使用mapper.xml

5.mapper层的接口继承MyMapper类

public interface UserInfoMapper extends MyMapper {
    //在使用通用Mapper的基础上 下面的都是mybatis注解的方法
    @Select("select * from user_info")
    List getAll();

}

6.在Application.class类中注解@MapperScan

@SpringBootApplication
@MapperScan("com.xpf.mapper")
public class SpringbootMapperTestApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootMapperTestApplication.class, args);
    }
}

7.测试

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootMapperTestApplicationTests {

    @Autowired
    UserInfoMapper userInfoMapper;
    @Test
    public void contextLoads() {
    }
    @Test
    public void testUserinfo(){

        UserInfo userInfo=new UserInfo();
        userInfo.setUid(1);

        System.out.println(userInfoMapper.selectOne(userInfo));
       // System.out.println(userInfoMapper.selectByPrimaryKey(1));
    }
}

测试时发现，测试这个方法时报错selectByPrimaryKey

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='name', mode=IN, javaType=class java.lang.String, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #2 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String

	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
	at com.sun.proxy.$Proxy61.selectOne(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166)
	at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:83)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
	at com.sun.proxy.$Proxy75.selectByPrimaryKey(Unknown Source)
	at com.xpf.SpringbootMapperTestApplicationTests.testUserinfo(SpringbootMapperTestApplicationTests.java:29)
	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:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
	at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$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.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='name', mode=IN, javaType=class java.lang.String, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #2 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
	at org.apache.ibatis.scripting.defaults.DefaultParameterHandler.setParameters(DefaultParameterHandler.java:89)
	at org.apache.ibatis.executor.statement.PreparedStatementHandler.parameterize(PreparedStatementHandler.java:93)
	at org.apache.ibatis.executor.statement.RoutingStatementHandler.parameterize(RoutingStatementHandler.java:64)
	at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:86)
	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)
	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)
	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.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
	... 36 more
Caused by: org.apache.ibatis.type.TypeException: Error setting non null for parameter #2 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
	at org.apache.ibatis.type.BaseTypeHandler.setParameter(BaseTypeHandler.java:55)
	at org.apache.ibatis.scripting.defaults.DefaultParameterHandler.setParameters(DefaultParameterHandler.java:87)
	... 52 more
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
	at org.apache.ibatis.type.StringTypeHandler.setNonNullParameter(StringTypeHandler.java:26)
	at org.apache.ibatis.type.BaseTypeHandler.setParameter(BaseTypeHandler.java:53)
	... 53 more

2018-09-29 19:38:11.860  INFO 11068 --- [       Thread-2] o.s.w.c.s.GenericWebApplicationContext   : Closing org.springframework.web.context.support.GenericWebApplicationContext@248e319b: startup date [Sat Sep 29 19:38:09 CST 2018]; root of context hierarchy
2018-09-29 19:38:11.866  INFO 11068 --- [       Thread-2] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closed

Process finished with exit code -1

额，这个问题我也不是很明白，有知道原理的请在评论区留下你影迹
不过这个页有解决方案，在实体类中加入主键信息

public class UserInfo {
    @Id
    private Integer uid;

    private String name;

    private String password;

    private String salt;

    private Byte state;

    private String username;

    private Long id;
		//set,get省略
}

OK