详解MyBatis Plus中分页插件的使用
作者:世界尽头与你
MyBatis Plus分页插件使用
MyBatis Plus中使用分页插件也很简单:
首先编写配置类:
@Configuration public class MyBatisPlusConfig { @Bean public MybatisPlusInterceptor mybatisPlusInterceptor() { // 构造拦截器 MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor(); // 添加分页插件 interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL)); return interceptor; } }
大功告成!现在来测试一下吧:
@Test void contextLoads() { Page<User> page = new Page<>(1, 2); userMapper.selectPage(page, null); System.out.println(page); }
==> Preparing: SELECT COUNT(*) AS total FROM user WHERE is_delete = 0
==> Parameters:
<== Columns: total
<== Row: 3
<== Total: 1
==> Preparing: SELECT id,name,age,email,is_delete FROM user WHERE is_delete=0 LIMIT ?
==> Parameters: 2(Long)
<== Columns: id, name, age, email, is_delete
<== Row: 2, hello, 33, 111@qq.com, 0
<== Row: 3, hello, 18, 34567@qq.com, 0
<== Total: 2
也可以很容易的获取分页相关的数据:
程序实例:
@Test void contextLoads() { Page<User> page = new Page<>(1, 2); userMapper.selectPage(page, null); // 获取当前页的记录 List<User> records = page.getRecords(); records.forEach(System.out::println); // 获取当前页的页码 long current = page.getCurrent(); System.out.println(current); // 获取分页的总页码数 long size = page.getSize(); System.out.println(size); // 判断是否有下一页 boolean b = page.hasNext(); System.out.println(b); // 判断是否有上一页 boolean b1 = page.hasPrevious(); System.out.println(b1); }
自定义分页功能
首先,定义一个mapper接口,返回一个Page对象:
Page<User> selectPageVo(@Param("page") Page<User> page, @Param("age") Integer age);
实现mapper接口:
<select id="selectPageVo" resultType="User"> select id,name,age,email from user where age = #{age} </select>
我们使用了类型别名,不要忘记在配置类中开启扫描类型别名所在的包:
mybatis-plus: ... # 配置类型别名对应的包 type-aliases-package: com.klza.pojo
现在来测试一下吧:
@Test void contextLoads() { Page<User> page = new Page<>(1, 2); Page<User> userPage = userMapper.selectPageVo(page, 18); System.out.println(userPage); }
==> Preparing: SELECT COUNT(*) AS total FROM user WHERE age = ?
==> Parameters: 18(Integer)
<== Columns: total
<== Row: 2
<== Total: 1
==> Preparing: select id,name,age,email from user where age = ? LIMIT ?
==> Parameters: 18(Integer), 2(Long)
<== Columns: id, name, age, email
<== Row: 3, hello, 18, 34567@qq.com
<== Row: 4, hello, 18, 34567@qq.com
<== Total: 2
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