Mybatis操作三张表：一对多对多：

喜欢ヅ旅行 2023-10-03 21:45 13阅读 0赞

## Mybatis操作 三张表：一对多对多： ##

### 1、domain类： ###

package com.zhecre.jx.business.model.cases.request;
    
    import lombok.Data;
    
    import java.util.Date;
    import java.util.List;
    
    /**
     * 描述：新增请求数据
     *
     * @CreateTime: 2022/11/24 16:29:56
     * @Version: 1.0
     */
    @Data
    public class SchemeAddition {
        
    
        private String type;  //类型：新增时默认 1：当量指标 2：质量指标
    
        private String status; //方案状态：方案状态(1：未提交|2：已提交|3：已驳回|4：已审核)
    
        private String onoff;  //状态(0：停用 　|　 1：启用)
    
    
        private String casename;   //方案名称
    
        private String caseid;   //方案编号、方案ID
    
        private String casetype;   //翻案类型
    
        private String remark;    //方案说明 备注
    
        private Date createdate;//方案创建时间
    
        private Date modifydate;//修改方案时间
    
        private String isdelete; //删除方案：不要真删除 Y|N
    
        //PAS_CAS_HOSPITAL 表
        private List<Mechanism> mechdata;
    
        //PAS_CAS_INDEX 表
        private List<IndicatorData> catordata;
    }

package com.zhecre.jx.business.model.cases.request;
    
    import lombok.Data;
    
    /**
     * 描述： PAS_CAS_HOSPITAL 表
     *
     *
     */
    @Data
    public class Mechanism {
        
    
        private String  hosname;//机构
    
        private String orgid;//机构id
    
        private String caseid;   //方案编号、方案ID
    }

package com.zhecre.jx.business.model.cases.request;
    
    import lombok.Data;
    
    /**
     * 描述：PAS_CAS_INDEX 表
     *
     * @CreateTime: 2022/11/24 16:31:02
     * @Version: 1.0
     */
    @Data
    public class IndicatorData {
        
    
        private String indexid;    //指标ID
    
        private String indexname;   //指标名称
    
        private String unit; //计量 值单位
    
        private Double coef; //标化当量 权重
    
        private Double discount;     //折算当量
    
        private String caseid;   //方案编号、方案ID
    }

### 2、controller 层： ###

@GetMapping("/getecho/{caseid}")
        public SchemeAddition getCompensation(@PathVariable("caseid")String caseid){
            return  pasCaseService.getCompensation(caseid);
        }

### 3、service层接口方法： ###

SchemeAddition getCompensation(String caseid);

### 4、service层接口实现方法： ###

@Override
        public SchemeAddition getCompensation(String caseid) {
        
            return  pasCaseMapper.getCompensation(caseid);
        }

### 5、Mapper接口： ###

SchemeAddition getCompensation(String caseid);

### 6、Mapper XML文件： ###

#### 注意： ####

即：JavaType和ofType都是用来指定对象类型的，但是JavaType是用来指定pojo中属性的类型，而ofType指定的是映射到list集合属性中pojo的类型

<resultMap id="getCompensationMapper" type="com.zhecre.jx.business.model.cases.request.SchemeAddition">
    
            <id column="caseid" property="caseid"/>
            <result column="casename" property="casename"/>
            <result column="casetype" property="casetype"/>
            <result column="remark" property="remark"/>
    
    
            <collection property="mechdata" ofType="com.zhecre.jx.business.model.cases.request.Mechanism">
                <id column="caseid" property="caseid"/>
                 <result column="orgid" property="orgid"/>
                <result column="hosname" property="hosname"/>
            </collection>
    
            <collection property="catordata" ofType="com.zhecre.jx.business.model.cases.request.IndicatorData">
                <id column="caseid" property="caseid"/>
                <result column="indexid" property="indexid"/>
                <result column="unit" property="unit"/>
                <result column="coef" property="coef"/>
                <result column="discount" property="discount"/>
                <result column="caseid" property="caseid"/>
            </collection>
    
        </resultMap>
    
    
        <select id="getCompensation" resultType="com.zhecre.jx.business.model.cases.request.SchemeAddition" resultMap="getCompensationMapper">
            SELECT c.casename,c.caseid,c.casetype,c.remark,
                   x.indexid,x.indexname,x.caseid,x.unit,x.coef,x.discount,
                   h.caseid,h.hosname,h.orgid
            FROM PAS_CASE c,PAS_CASE_INDEX x,PAS_CASE_HOSPITAL h
                 WHERE c.CASEID=x.CASEID
                       and h.CASEID=c.CASEID
                       and c.CASEID=#{caseid}
        </select>