ibatis主子表查询

1、sql

主表

CREATE TABLE `account_group` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `name` varchar(50) DEFAULT NULL COMMENT '公众号分组',

  `count` int(11) DEFAULT NULL COMMENT '分组下有多少公众号',

  `user_id` int(11) DEFAULT NULL COMMENT '用户id',

  `created_at` timestamp NULL DEFAULT NULL COMMENT '创建时间',

  PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

字表

CREATE TABLE `wx_account` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `accountname` varchar(255) NOT NULL COMMENT 'accountname',

  `account_group_id` int(11) DEFAULT NULL COMMENT '公众号分组id',

  `createTime` varchar(255) DEFAULT NULL,

  PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

字表通过account_group_id与主表id关联
2、实体类

主表

/**                                                

 * Domain Object. Generated by RAD automatically.

 *                                               

 */                                              

public class AccountGroup extends BaseModel implements Serializable {



    /**

     * 

     */

    private static final long serialVersionUID = -2651997950883256833L;

    private Integer user_id;

    private String name;

    private Integer count;

    private Integer id;

    private List<WxAccount> accounts;





    public List<WxAccount> getAccounts() {

        return accounts;

    }



    public void setAccounts(List<WxAccount> accounts) {

        this.accounts = accounts;

    }



    public Integer getUser_id() {

        return user_id;

    }





    public Integer getId() {

        return id;

    }



    public void setId(Integer id) {

        this.id = id;

    }



}

子表：略

3、sql-xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE sqlMap PUBLIC "-//iBATIS.com//DTD SQL Map 2.0//EN" "http://www.ibatis.com/dtd/sql-map-2.dtd">

<sqlMap namespace="AccountGroup">

    <resultMap id="NewResultMap" class="com.xxxxx.accountGroup.model.AccountGroup">

        <result column="id" property="id" jdbcType="INTEGER" />

        <result column="name" property="name" jdbcType="VARCHAR" />

        <result column="count" property="count" jdbcType="INTEGER" />

        <result column="user_id" property="user_id" jdbcType="INTEGER" />

        <result column="created_at" property="created_at" jdbcType="VARCHAR" />

        <result column="id" property="accounts" select="getAccountByGroupId"/>

    </resultMap>

    <sql id="getAccountGroupList_body">

        <dynamic prepend="WHERE">

            <isNotNull prepend="AND" property="id"> id=#id# </isNotNull>

            <isNotNull prepend="AND" property="name"> name=#name# </isNotNull>

            <isNotNull prepend="AND" property="count"> count=#count# </isNotNull>

            <isNotNull prepend="AND" property="user_id"> user_id=#user_id# </isNotNull>

            <isNotNull prepend="AND" property="created_at"> created_at=#created_at# </isNotNull>

        </dynamic>

    </sql>

  

    <select id="getAccountGroupListWithAccount" parameterClass="com.xxxxx.accountGroup.model.AccountGroup" resultMap="NewResultMap">

        SELECT * FROM account_group

        <include refid="getAccountGroupList_body" />

    </select>

  

    <select id="getAccountByGroupId" parameterClass="int"

        resultClass="com.xxxxx.wxAccount.model.WxAccount">

        select *

        FROM wx_account

        where account_group_id = #id#

    </select>

</sqlMap>

 查询结果中group实体的accounts属性会自动填充为List<account>