Mybatis工作知识总结

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本文链接： https://blog.csdn.net/weixin_36279318/article/details/100920888

1.遍历list查询

List<InvestDetailPO> getByPayOrderIds(@Param("payOrderIds") List<String> payOrderIds);
 <select id="getByPayOrderIds" resultMap="BaseResultMap">
 SELECT <include refid="Base_Column_List" />
 FROM t_invest_detail
 where pay_order_id in
 (
 <foreach collection="payOrderIds" item="item"  separator="," >
 #{item}
 </foreach>
 )
 ORDER BY pay_order_id DESC
 </select>

2.批量插入数据

 int insertByBatch(List<T> var1);
    <insert id="insertByBatch" useGeneratedKeys="true" parameterType="java.util.List">
        insert into t_invest_order_detail ( uid,
        order_id,
        status,
        remark,
        create_time
        )
        values
        <foreach collection="list" item="item"  separator="," >
            (
            #{item.uid,jdbcType=BIGINT},
            #{item.orderId,jdbcType=VARCHAR},
            #{item.status,jdbcType=TINYINT},
            #{item.remark,jdbcType=VARCHAR},
            now()
            )
        </foreach>
    </insert>

3.批量更新数据

int updateStatusByBatch(@Param("list")List<InvestDetailPO> investDetailList, @Param("status")int status, @Param("remark")String remark);
<update id="updateStatusByBatch" >
<foreach collection="list" item="item" separator=";">
  update t_trade_flow
  set status  = #{status}, remark = #{remark}, update_time = now()
  where order_id = #{item.orderId}
</foreach>
</update>

4.方法中一个参数

Integer isExistWaitPayOrder(@Param("uid") Long uid);
 <select id="isExistWaitPayOrder" resultType="java.lang.Integer">
SELECT 1 FROM t_trade_flow WHERE uid=#{uid}  and status=3 and trade_type=1  limit 1
</select>

5.方法中有多个参数

Long getInvestSumByUidAndPno(@Param("pno") String pno, @Param("productType") int productType, @Param("uid") Long uid);
<select id="getInvestSumByUidAndPno" resultType="java.lang.Long">
    select IFNULL(sum(amount),0) from t_trade_flow where uid = #{uid} and pno = #{pno}     and product_type = #{productType} and status in (0,1);
</select>

6.方法中是一个对象

int updateSyncStatus(InvestDetailPO detailPO);
 <update id="updateSyncStatus" parameterType="com.wang.po.InvestDetailPO">
        UPDATE t_invest_detail
        SET sync_cs = #{syncCs,jdbcType=TINYINT},
        update_time = now()
        where pay_order_id = #{payOrderId,jdbcType=VARCHAR}
    </update>

7.方法中是一个Map

List<InvestDetailPO> listByParam(Map<String,Object> param);
   <select id="listByParam" parameterType="java.util.Map" resultMap="BaseResultMap">
        SELECT <include refid="Base_Column_List" />
        FROM t_invest_detail
        WHERE 1 = 1
        <if test="uid != null">
            AND uid = #{uid,jdbcType=BIGINT}
        </if>
        <if test="pno != null">
            AND pno = #{pno,jdbcType=VARCHAR}
        </if>
        <if test="status != null">
            AND status = #{status,jdbcType=TINYINT}
        </if>
        <if test="intervalTime != null">
            AND create_time &lt;= #{intervalTime,jdbcType=TIMESTAMP}
        </if>
    </select>