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MyBatis中执行相关SQL语句的方法

作者:weixin_46949892

本文主要介绍了MyBatis中执行相关SQL语句的方法,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧

1.between... and...

<if test="(reportStartDate != null and reportStartDate != '') || (reportEndDate != null and reportEndDate != '')">
    and report_date between #{reportStartDate} AND #{reportEndDate}
</if>

2.and   or

<if test="method != null">
    and ( Method like CONCAT('%', #{key ,jdbcType=VARCHAR}, '%')
    or EventCode like CONCAT('%', #{key ,jdbcType=VARCHAR}, '%')
    or EventName like CONCAT('%', #{key ,jdbcType=VARCHAR}, '%')
    )
</if>

3.like ---两种写法

<!--第一种写法-->
<where>          
  <if test="reportRule != null and reportRule != ''">
      and report_rule like CONCAT('%',#{reportRule},'%')
  </if>           
</where>
<!--第二种写法-->         
<where>
  <if test="custName != null and custName != ''">
      and cust_name like '%' #{custName} '%'
  </if>
  <if test="creater != null and creater != ''">
       and creater like '%' #{creater} '%'
  </if>
</where>

完整示例: 

<select id="findByQueryIds"  parameterType="string" resultType="java.lang.Integer">
    select id from t_monitor_suspicion_custom
    <where>
      <if test="(reportStartDate != null and reportStartDate != '') || (reportEndDate != null and reportEndDate != '')">
         and report_date between #{reportStartDate} AND #{reportEndDate}
      </if>
      <if test="reportRule != null and reportRule != ''">
         and report_rule like CONCAT('%',#{reportRule},'%')
      </if>
      <if test="custNo != null and custNo != ''">
         and cust_no like CONCAT('%',#{custNo},'%')
      </if>
      <if test="custName != null and custName != ''">
          and cust_name like CONCAT('%',#{custName},'%')
      </if>
      <if test="customType != null and customType != ''">
          and custom_type = #{customType}
      </if>
   </where>
   and (suspicion_status = #{value} or suspicion_status = #{value1})
</select>

 前端传入cust_no为1019,后端实际查询语句

[zl-aml-admin] DEBUG 2023-08-15 10:44:14.514 [http-nio-8081-exec-20] com.zlpay.modules.monitor.dao.SuspicionCustomDao.findByQueryIds [BaseJdbcLogger.java:137] - ==>  Preparing: select id from t_monitor_suspicion_custom WHERE cust_no like CONCAT('%',?,'%') and (suspicion_status = ? or suspicion_status = ?)
[zl-aml-admin] DEBUG 2023-08-15 10:44:14.516 [http-nio-8081-exec-20] com.zlpay.modules.monitor.dao.SuspicionCustomDao.findByQueryIds [BaseJdbcLogger.java:137] - ==> Parameters: 1019(String), 0(String), 3(String)
[zl-aml-admin] DEBUG 2023-08-15 10:44:14.519 [http-nio-8081-exec-20] com.zlpay.modules.monitor.dao.SuspicionCustomDao.findByQueryIds [BaseJdbcLogger.java:137] - <==      Total: 1

注意:由于一开始where语句只写了 <if test="reportRule != null>没有写reportRule != ''" ,导致查询结果出错,所以我们如果用到动态查询的话,一定要搞清楚前端传的是空值还是null值,如果不确定的话,就都判断一下<if test="reportRule != null and reportRule != ''">

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