Scenes:
- A: SecControlRulePojo.java
- B:SecControlSubRulePojo
- C:SecControlSubRuleManyPojo
Entity A contains List<B> field, and Entity B contains List<C> field
Query mapping is done using mybatis.
First define ResultMap
<resultMap type="com.wisdombud.dth.boss.control.pojo.SecControlRulePojo" id="FULL_RESULT_MAP"> <id column="ID" jdbcType="DECIMAL" property="id" /> <result column="NAME" jdbcType="VARCHAR" property="name" /> <result column="ACTION_CODE" jdbcType="DECIMAL" property="actionCode" /> <result column="TIP_INFO" jdbcType="VARCHAR" property="tipInfo" /> <result column="IS_VALID" jdbcType="DECIMAL" property="isValid" /> <result column="IS_WHITE" jdbcType="DECIMAL" property="isWhite" /> <result column="CREATE_LOGIN_NO" jdbcType="VARCHAR" property="createLoginNo" /> <result column="CREATE_TIME" jdbcType="TIMESTAMP" property="createTime" /> <result column="CREATE_SERIAL_NUM" jdbcType="DECIMAL" property="createSerialNum" /> <result column="LAST_UPDATE_TIME" jdbcType="TIMESTAMP" property="lastUpdateTime" /> <result column="LAST_LOGIN_NO" jdbcType="VARCHAR" property="lastLoginNo" /> <result column="LAST_SERIAL_NUM" jdbcType="DECIMAL" property="lastSerialNum" /> <result column="REMARK" jdbcType="VARCHAR" property="remark" /> <result column="RE1" jdbcType="VARCHAR" property="re1" /> <result column="RE2" jdbcType="VARCHAR" property="re2" /> <result column="RE3" jdbcType="VARCHAR" property="re3" /> <result column="RE4" jdbcType="VARCHAR" property="re4" /> <collection property="subRuleList" ofType="com.wisdombud.dth.boss.control.pojo.SecControlSubRulePojo"> <result column="ID" property="id" /> <result column="RULE_ID" jdbcType="DECIMAL" property="ruleId" /> <result column="SUB_ACTION_CODE" jdbcType="DECIMAL" property="actionCode" /> <result column="SUB_IS_VALID" jdbcType="DECIMAL" property="isValid" /> <result column="SUB_IS_WHITE" jdbcType="DECIMAL" property="isWhite" /> <result column="FACTOR_CODE" jdbcType="DECIMAL" property="factorCode" /> <result column="OPERATOR_CODE" jdbcType="DECIMAL" property="operatorCode" /> <result column="QUANTITY_VALUE" jdbcType="DECIMAL" property="quantityValue" /> <result column="QUANTITY_TIME_START" jdbcType="TIMESTAMP" property="quantityTimeStart" /> <result column="QUANTITY_TIME_END" jdbcType="TIMESTAMP" property="quantityTimeEnd" /> <collection property="manyList" ofType="com.wisdombud.dth.boss.control.pojo.SecControlSubRuleManyPojo"> <result column="SUB_MANY_ID" property="id" /> <result column="SUB_RULE_ID" property="subRuleId" /> <result column="VALUE_ID" property="valueId" /> <result column="VALUE_STRING" property="valueString" /> <result column="EXPRESSION" property="expression" /> </collection> </collection> </resultMap>
If the entity contains the same column name, you need to alias the column name and set
<result column="alias" property="entity field name" />
SQL:
<select id="selectAll" resultMap="FULL_RESULT_MAP"> SELECT controlRule.ID,controlRule.NAME,controlRule.ACTION_CODE,controlRule.CREATE_LOGIN_NO, controlRule.CREATE_SERIAL_NUM,controlRule.CREATE_TIME,controlRule.IS_VALID,controlRule.IS_WHITE, controlRule.LAST_LOGIN_NO,controlRule.LAST_SERIAL_NUM,controlRule.LAST_UPDATE_TIME, subRule.ID subId,subRule.RULE_ID,subRule.ACTION_CODE SUB_ACTION_CODE,subRule.IS_VALID SUB_IS_VALID,subRule.IS_WHITE SUB_IS_WHITE, subRule.FACTOR_CODE,subRule.OPERATOR_CODE,subRule.QUANTITY_VALUE,subRule.QUANTITY_TIME_START,subRule.QUANTITY_TIME_END, subRuleMany."ID" SUB_MANY_ID,subRuleMany.SUB_RULE_ID,subRuleMany.VALUE_ID,subRuleMany.VALUE_STRING,subRuleMany.EXPRESSION FROM SEC_CONTROL_RULE controlRule, SEC_CONTROL_SUB_RULE subRule, SEC_CONTROL_SUB_RULE_MANY subRuleMany WHERE controlRule."ID"=subRule.RULE_ID AND subRule.RULE_ID = subRuleMany.SUB_RULE_ID </select>