mybatis表关联查询_MySQL

作三张表的关联查询

cfm_requirement_vendor_date为cfm_requirement_vendor的子表

cfm_requirement_vendor为cfm_requirement的子表

一、mybatis映射文件定义

       		SELECT			r.id,			r.requirement_id,			v.id as requirement_vendor_id,			v.vendor_id,			d.id as requirement_vendor_date_id,		FROM			cfm_requirement r		JOIN cfm_requirement_vendor v ON r.id = v.cfm_requirement_id		AND v.del_flag = 0 		join cfm_requirement_vendor_date d on v.id = d.cfm_requirement_vendor_id and d.del_flag=0 		WHERE			r.requirement_id = #{requirementId} and r.del_flag=0	

二、java类定义

1、mapper.java

List selectNestedByRequirementId(int requirementId);

2、持久化对象

public class NestedRequirement extends Requirement {    private List requirementVendorList;	public List getRequirementVendorList() {		return requirementVendorList;	}	public void setRequirementVendorList(			List requirementVendorList) {		this.requirementVendorList = requirementVendorList;	}      }