MyBatis-Plus（二、常用注解）

packagecom.example.mybatisplus.entiy;
importcom.baomidou.mybatisplus.annotation.TableName;
importlombok.Data;
@Data@TableName("mp")        //表名publicclassUser {
privateStringid;
privateStringname;
privateStringage;
}

AUTO(0),
NONE(1),
INPUT(2),
ASSIGN_ID(3),
ASSIGN_UUID(4),
/** @deprecated */@Deprecated#已不推荐ID_WORKER(3),
/** @deprecated */@Deprecated#已不推荐ID_WORKER_STR(3),
/** @deprecated */@Deprecated#已不推荐UUID(4);

@Testvoidsave(){
Useruser=newUser();
user.setName("张三");
user.setAge(20);
userMapper.insert(user);
    }

@TableField(fill=FieldFill.INSERT)        //填充字段privateDatecreateTime;
@TableField(fill=FieldFill.INSERT_UPDATE)         //填充字段privateDateupdateTime;

packagecom.example.mybatisplus.handle;
importcom.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
importorg.apache.ibatis.reflection.MetaObject;
importorg.springframework.stereotype.Component;
@ComponentpublicclassMyMetaObjectHandlerimplementsMetaObjectHandler {
@OverridepublicvoidinsertFill(MetaObjectmetaObject) {
this.setFieldValByName("createTime", System.currentTimeMillis(), metaObject);   // 创建时间 或者new Date()this.setFieldValByName("updateTime", System.currentTimeMillis(), metaObject);   // 更新时间    }
@OverridepublicvoidupdateFill(MetaObjectmetaObject) {
this.setFieldValByName("updateTime", System.currentTimeMillis(), metaObject);   // 更新时间    }
}

@VersionprivateIntegerversion;                //乐观锁

packagecom.example.mybatisplus.config;
importcom.baomidou.mybatisplus.extension.plugins.OptimisticLockerInterceptor;
importorg.springframework.context.annotation.Bean;
importorg.springframework.context.annotation.Configuration;
@Configuration// 声明为配置类publicclassMyConfig {
@BeanpublicOptimisticLockerInterceptoroptimisticLockerInterceptor(){
returnnewOptimisticLockerInterceptor();                       // 创建一个 OptimisticLockerInterceptor 对象    }
}

privateStatusEnumstatus;              //状态    枚举类型

packagecom.example.mybatisplus.enums;
importcom.baomidou.mybatisplus.annotation.EnumValue;
publicenumStatusEnum {        //枚举类   enum类型的类//奖励1  惩罚0reward(1,"奖励"),punishment(0,"惩罚");
@EnumValueprivateIntegercode;
privateStringmsg;
StatusEnum(Integercode, Stringmsg) {
this.code=code;
this.msg=msg;
    }
}

mybatis-plus:
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl#日志实现类-->打印sqltype-enums-package:
com.example.mybatisplus.enums#实现类所在的包这里

importcom.baomidou.mybatisplus.core.enums.IEnum;
publicenumSexEnumimplementsIEnum<Integer> {
ONE(1,"男"),
TWO(0,"女"),
privateIntegercode;
privateStringmsg;
AgeEnum(Integercode, Stringmsg) {
this.code=code;
this.msg=msg;
    }
@OverridepublicIntegergetValue() {
returnthis.code;
    }
}

@TableLogicprivateIntegeridentification;         //是否删除标识

mybatis-plus:
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl#日志实现类-->打印sqltype-enums-package:
com.example.mybatisplus.enums#实现类所在的包global-config:
db-config:
logic-not-delete-value: 0#逻辑删除的值logic-delete-value: 1#逻辑删除的值