Java中MyBatis Plus知识点总结

<dependency>

<groupId>com.baomidou</groupId>

<artifactId>mybatis-plus</artifactId>

<version>2.3</version>

</dependency>

<!-- MP 提供的 MybatisSqlSessionFactoryBean -->

 <bean id="sqlSessionFactoryBean"

   class="com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean">

   <!-- 数据源 -->

   <property name="dataSource" ref="dataSource"/>

   <!-- 别名处理 -->

   <property name="typeAliasesPackage" value="com.qf.entity"/>

   <!-- 插件注册 -->

   <property name="plugins">

     <list>
<!-- 注册分页插件 -->

       <bean class="com.baomidou.mybatisplus.plugins.PaginationInterceptor" />

     </list>

   </property>

 </bean>

public interface IUserDao extends BaseMapper<User> {

}

@Data

@TableName(value="t_user")

public class User{

 @TableId(value="id",type=IdType.AUTO)

 private Integer id;

 @TableField(value="username")

 private String name;

 private Integer age;

 private String password;

 @TableField(exist=false)

 private Integer xxx;
}

@Test

 public void testMybatisPlus(){

   System.out.println("selectById:"+userDao.selectById(4)); // 根据Id查询

   System.out.println("selectList:"+userDao.selectList(null)); // 查询全部

   com.baomidou.mybatisplus.plugins.Page<User> page = new com.baomidou.mybatisplus.plugins.Page<>();

   List<User> list = userDao.selectPage(page, null); // 分页查询

   page.setRecords(list); // 把结果封装到分页对象中

   System.out.println(page.getCurrent());

   System.out.println(page.getPages());

   System.out.println(page.getSize());

   System.out.println(page.getTotal());

   System.out.println(page.getRecords());

   EntityWrapper<User> entityWrapper = new EntityWrapper<>();

   entityWrapper.eq("id", 4);

   entityWrapper.or().like("username", "3");

   List<User> selectList = userDao.selectList(entityWrapper); // 条件查询

   System.out.println("wrapper:"+selectList);

 }