MyBatis中的几种注解映射

Posted 2023-04-18

参考技术A 原文链接:http://blog.csdn.net/naruto_mr/article/details/48207437

1.普通映射

@Select("select * from mybatis_Student where id=#id")    

public Student getStudent(int id);    

@Insert("insert into mybatis_Student (name, age, remark, pic,grade_id,address_id) values (#name,#age,#remark, #pic,#grade.id,#address.id)")    

public int insert(Student student);    

@Update("update mybatis_Student set name=#name,age=#age where id=#id")    

public int update(Student student);    

@Delete("delete from mybatis_Student where id=#id")    

public int delete(int id);    

2.结果集映射

@Select("select * from mybatis_Student")    

@Results(    

@Result(id=true,property="id",column="id"),    

@Result(property="name",column="name"),    

@Result(property="age",column="age")    

)    

public List getAllStudents();    

3.关系映射

3.1一对一

@Select("select * from mybatis_Student")    

@Results(    

@Result(id=true,property="id",column="id"),    

@Result(property="name",column="name"),    

@Result(property="age",column="age"),    

@Result(property="address",column="address_id",one=@One(select="com.skymr.mybatis.mappers.AddressMapper.getAddress"))    

)    

public List getAllStudents();   

3.2一对多

@Select("select * from mybatis_grade where id=#id")    

@Results(    

@Result(id=true,column="id",property="id"),    

@Result(column="grade_name",property="gradeName"),    

@Result(property="students",column="id",many=@Many(select="com.skymr.mybatis.mappers.Student2Mapper.getStudentsByGradeId"))    

   )    

public Grade getGrade(int id); 

mybatis 批量增删改查操作的几种操作以及创建数据库索引

参考技术A 1、批量插入操作

     mapper.java层定义：

     int batchInsert(List stockList);

mapper.xml层的sql语句：

insert into t_stock (status, asset_classify_id,asset_id,asset_item_id, name,num, batch_num, tag_id,rfid, epc, barcode,qr_code, erp, unit,pic_url, specification, model,material, color,length,width, height, weight,density, volume, price01,price02,warehouse_id, storage_zone_id,storage_location_id,storage_location_tag_id,remark, attr01, attr02,attr03, create_date,last_update,creater, client_id)values (#item.status,jdbcType=VARCHAR,#item.assetClassifyId,jdbcType=BIGINT,#item.assetId,jdbcType=BIGINT, #item.assetItemId,jdbcType=BIGINT,#item.name,jdbcType=VARCHAR,#item.num,jdbcType=VARCHAR,#item.batchNum,jdbcType=VARCHAR, #item.tagId,jdbcType=VARCHAR,#item.rfid,jdbcType=VARCHAR, #item.epc,jdbcType=VARCHAR,#item.barcode,jdbcType=VARCHAR,#item.qrCode,jdbcType=VARCHAR,#item.erp,jdbcType=VARCHAR, #item.unit,jdbcType=VARCHAR,#item.picUrl,jdbcType=VARCHAR,#item.specification,jdbcType=VARCHAR,#item.model,jdbcType=VARCHAR,#item.material,jdbcType=VARCHAR,#item.color,jdbcType=VARCHAR, #item.length,jdbcType=DECIMAL,#item.width,jdbcType=DECIMAL, #item.height,jdbcType=DECIMAL,#item.weight,jdbcType=DECIMAL,#item.density,jdbcType=DECIMAL,#item.volume,jdbcType=DECIMAL, #item.price01,jdbcType=DECIMAL,#item.price02,jdbcType=DECIMAL,#item.warehouseId,jdbcType=BIGINT,#item.storageZoneId,jdbcType=BIGINT,#item.storageLocationId,jdbcType=BIGINT,#item.storageLocationTagId,jdbcType=BIGINT,#item.remark,jdbcType=VARCHAR, #item.attr01,jdbcType=VARCHAR,#item.attr02,jdbcType=VARCHAR,#item.attr03,jdbcType=VARCHAR,#item.createDate,jdbcType=TIMESTAMP,#item.lastUpdate,jdbcType=TIMESTAMP,#item.creater,jdbcType=BIGINT, #item.clientId,jdbcType=BIGINT)