如果说ssm比ssh究竟好用在哪里,快速开发体验在哪里的话,那必然就是mybatis了,如果还要找一个比mybatis更优秀的dao层框架,那必然就是他的大哥——mybatis plus。
MyBatis-Plus 是一个 Mybatis 增强版工具,在 MyBatis 上扩充了其他功能没有改变其基本功能,只是为了简化开发提交效率而存在。
官网文档地址:
https://mp.baomidou.com/guide/
MyBatis-Plus 特性:
https://mp.baomidou.com/guide/#%E7%89%B9%E6%80%A7
org.projectlombok
lombok
com.baomidou
mybatis-plus-boot-starter
3.3.2
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CREATE TABLE `user` (
`id` bigint(20) NOT NULL COMMENT '主键ID',
`name` varchar(30) DEFAULT NULL COMMENT '姓名',
`age` int(11) DEFAULT NULL COMMENT '年龄',
`email` varchar(50) DEFAULT NULL COMMENT '邮箱',
`gmt_create` datetime DEFAULT NULL COMMENT '创建时间',
`gmt_modified` datetime DEFAULT NULL COMMENT '修改时间',
`version` int(11) DEFAULT NULL COMMENT '乐观锁',
`deleted` int(1) unsigned zerofill DEFAULT '0' COMMENT '逻辑删除',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
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@Data
@AllArgsConstructor
@NoArgsConstructor
public class User implements Serializable {
private Long id;
private String name;
private Integer age;
private String email;
/*创建时间*/
@TableField(fill = FieldFill.INSERT)
private Date gmtCreate;
/*修改时间*/
@TableField(fill = FieldFill.UPDATE)
private Date gmtModified;
/*乐观锁*/
@Version
private Integer version;
/*逻辑删除*/
@TableLogic
private Integer deleted;
}
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@Repository
public interface UserMapper extends BaseMapper {
}
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@MapperScan("com.hjc.demo.mybatiscase.mapper")
@EnableTransactionManagement
@Configuration
public class MybatisCaseConfig {
/*OptimisticLockerInterceptor 之前得插件已被弃用*/
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
/*乐观锁插件*/
interceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());
/*分页插件*/
interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
return interceptor;
}
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@Slf4j
@Component
public class MybatisCaseHandler implements MetaObjectHandler {
/*插入时填充策略*/
@Override
public void insertFill(MetaObject metaObject) {
log.info("start insertFill succeed");
this.setFieldValByName("gmtCreate",new Date(),metaObject);
this.setFieldValByName("gmtModified",new Date(),metaObject);
}
/*修改时填充策略*/
@Override
public void updateFill(MetaObject metaObject) {
log.info("start updateFill succeed");
this.setFieldValByName("gmtModified",new Date(),metaObject);
}
}
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构造器路径:https://baomidou.com/guide/wrapper.html#abstractwrapper
1
}
简单得案例就基本完成了!如需深入请进入官方文档自行学习!
页面更新:2024-06-18
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