mybatis-plus基本入门

1,导包(不需要mybatis的包）

 <dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>mybatis-plus</artifactId>
  <version>2.0.8</version>
</dependency>

2，配置文件
①

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:aop="http://www.springframework.org/schema/aop"
   xmlns:tx="http://www.springframework.org/schema/tx"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">



<!--加载配置文件-->
<context:property-placeholder location="classpath*:application.properties"/>
<!-- 数据源 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
    <property name="url" value="${db.master.url}"/>
    <property name="username" value="${db.master.user}"/>
    <property name="password" value="${db.master.password}"/>
</bean>


<bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <!-- 自动扫描Mapping.xml文件 -->
    <property name="mapperLocations" value="classpath*:/mapper/*.xml"></property>
    <!--扫描实体类-->
    <property name="typeAliasesPackage" value="com.study.entity"/>
    <!--mybatis-plus全局配置-->
    <property name="globalConfig" ref="globalConfig"/>
</bean>

<!-- MP 全局配置 -->
<bean id="globalConfig" class="com.baomidou.mybatisplus.entity.GlobalConfiguration">
    <!--主键为自增长-->
    <property name="idType" value="0"/>
    <!--下划线转驼峰命名-->
    <property name="dbColumnUnderline" value="true"/>
</bean>

<!-- MyBatis 动态实现  -->
<bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <!-- 对Dao 接口动态实现，需要知道接口在哪  -->
    <property name="basePackage" value="com.study.dao"/>
</bean>
</beans>

②

db.master.url=jdbc:mysql://127.0.0.1:3306/appmanager?    useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&transformedBitIsBoolean=true&useSSL=false
db.master.user=root
db.master.password=12345678

3，dao层如下

public interface UserMapper extends BaseMapper<User> {
}

4，service如下
public interface UserService extends IService<User> {
}

public class UserServiceImpl extends extends ServiceImpl<UserMapper,User> implements UserService {
} 

6，测试如下

public class MyTest {
@Test
public void test1() throws IOException {
   ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring-mybatis.xml");
    UserMapper mapper = context.getBean(UserMapper.class);
   /* User user=new User("admin","123456");
    User user1 = mapper.selectOne(user);
    System.out.println(user1);*/
   /* Wrapper wrapper= new Wrapper() {
        @Override
        public <T> T unwrap(Class<T> iface) throws SQLException {
            return null;
        }

        @Override
        public boolean isWrapperFor(Class<?> iface) throws SQLException {
            return false;
        }
    };*/
    List<User> users = mapper.selectList(new EntityWrapper<User>());
    System.out.println(users);
}
}