MyBatis SQL动态装配

MyBatis的方便在于可以配置动态SQL，通过过滤器进行动态装配。在刚开始使用中，遇到不少问题，其中update语句也需要动态装配，核心在于DAO层要与.xml文件中的语句和变量名要匹配。例如：

DAO层如下配置：

public void updateByJid(@Param("objectResult")RBTaskScoreDO rbTaskScore, @Param("filterRules")List<FilterRule> filterRules);

xml中如下：

    <update id="updateByJid">
        update
            RB_TASK_SCORE
        <set>
            <if test="objectResult.userId != null">
            USER_ID = #{objectResult.userId,jdbcType=VARCHAR},
        </if>
            <if test="objectResult.rid != null">
            RID = #{objectResult.rid,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.score != null">
            SCORE = #{objectResult.score,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.adddate != null">
            ADDDATE = #{objectResult.adddate,jdbcType=TIMESTAMP},
        </if>
            <if test="objectResult.checkState != null">
            CHECK_STATE = #{objectResult.checkState,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.gid != null">
            GID = #{objectResult.gid,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.isCheck != null">
            IS_CHECK = #{objectResult.isCheck,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.roadLength != null">
            ROAD_LENGTH = #{objectResult.roadLength,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.checkIsBound != null">
            CHECK_IS_BOUND = #{objectResult.checkIsBound,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.matchLenPct != null">
            MATCH_LEN_PCT = #{objectResult.matchLenPct,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.matchPntNum != null">
            MATCH_PNT_NUM = #{objectResult.matchPntNum,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.isBoss != null">
            IS_BOSS = #{objectResult.isBoss,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.isBossDate != null">
            IS_BOSS_DATE = #{objectResult.isBossDate,jdbcType=TIMESTAMP},
        </if>
            <if test="objectResult.md5 != null">
            MD5 = #{objectResult.md5,jdbcType=VARCHAR},
        </if>
            <if test="objectResult.checkDate != null">
            CHECK_DATE = #{objectResult.checkDate,jdbcType=TIMESTAMP},
        </if>
            <if test="objectResult.usertype != null">
            USERTYPE = #{objectResult.usertype,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.srcdate != null">
            SRCDATE = #{objectResult.srcdate,jdbcType=TIMESTAMP},
        </if>
            <if test="objectResult.noBoundInfo != null">
            NO_BOUND_INFO = #{objectResult.noBoundInfo,jdbcType=VARCHAR},
        </if>
            <if test="objectResult.matchPicNum != null">
            MATCH_PIC_NUM = #{objectResult.matchPicNum,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.pidStart != null">
            PID_START = #{objectResult.pidStart,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.pidEnd != null">
            PID_END = #{objectResult.pidEnd,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.taskDir != null">
            TASK_DIR = #{objectResult.taskDir,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.taskCategory != null">
            TASK_CATEGORY = #{objectResult.taskCategory,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.payState != null">
            PAY_STATE = #{objectResult.payState,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.payMd5 != null">
            PAY_MD5 = #{objectResult.payMd5,jdbcType=VARCHAR},
        </if>
            <if test="objectResult.appType != null">
            APP_TYPE = #{objectResult.appType,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.autonaviId != null">
            AUTONAVI_ID = #{objectResult.autonaviId,jdbcType=VARCHAR},
        </if>
            <if test="objectResult.tid != null">
            TID = #{objectResult.tid,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.coefficient != null">
            COEFFICIENT = #{objectResult.coefficient,jdbcType=NUMERIC},
        </if>
            <if test="objectResult.payType != null">
            PAY_TYPE = #{objectResult.payType,jdbcType=NUMERIC},
        </if>
                </set>

        <include refid="Common.parseFilterRules"/>

    </update>

objectResult是数据库映射到java的实体对象，在XML中配置如下：

    <resultMap type="com.autonavi.collect.ccs.dao.dbo.task.RBTaskScoreDO" id="objectResult">
        <result column="SID" property="sid"/>
        <result column="USER_ID" property="userId"/>
        <result column="JID" property="jid"/>
        <result column="RID" property="rid"/>
        <result column="SCORE" property="score"/>
        <result column="ADDDATE" property="adddate"/>
        <result column="CHECK_STATE" property="checkState"/>
        <result column="GID" property="gid"/>
        <result column="IS_CHECK" property="isCheck"/>
        <result column="ROAD_LENGTH" property="roadLength"/>
        <result column="CHECK_IS_BOUND" property="checkIsBound"/>
        <result column="MATCH_LEN_PCT" property="matchLenPct"/>
        <result column="MATCH_PNT_NUM" property="matchPntNum"/>
        <result column="IS_BOSS" property="isBoss"/>
        <result column="IS_BOSS_DATE" property="isBossDate"/>
        <result column="MD5" property="md5"/>
        <result column="CHECK_DATE" property="checkDate"/>
        <result column="USERTYPE" property="usertype"/>
        <result column="SRCDATE" property="srcdate"/>
        <result column="TASK_TYPE" property="taskType"/>
        <result column="NO_BOUND_INFO" property="noBoundInfo"/>
        <result column="MATCH_PIC_NUM" property="matchPicNum"/>
        <result column="TASK_CLASSES" property="taskClasses"/>
        <result column="PID_START" property="pidStart"/>
        <result column="PID_END" property="pidEnd"/>
        <result column="TASK_DIR" property="taskDir"/>
        <result column="TASK_CATEGORY" property="taskCategory"/>
        <result column="PAY_STATE" property="payState"/>
        <result column="PAY_MD5" property="payMd5"/>
        <result column="APP_TYPE" property="appType"/>
        <result column="AUTONAVI_ID" property="autonaviId"/>
        <result column="TID" property="tid"/>
        <result column="COEFFICIENT" property="coefficient"/>
        <result column="PAY_TYPE" property="payType"/>
            </resultMap>

这样在配置好了之后，在java中调用update的时候，传入实体类和过滤器就OK。

RBTaskScoreDO entity = new RBTaskScoreDO();
entity.setRid(Long.parseLong(rid));
entity.setJid(Long.parseLong(jid));
entity.setCheckIsBound(Long.parseLong(checkIsBound));
entity.setNoBoundInfo(noBoundInfo);
entity.setCheckState(Long.parseLong(checkState));

List<FilterRule> filterRuleList = new ArrayList<>();
filterRuleList.add(new FilterRule("jid", "=", jid));
filterRuleList.add(new FilterRule("task_type", "=", taskType));
filterRuleList.add(new FilterRule("task_classes", "=", taskClasses));
filterRuleList.add(new FilterRule("is_check", "=", 1));

rbtaskscoreService.updateByJid(entity, filterRuleList);