MyBatis的 or 和and 問題

今天排查一個mybatis查詢的問題，用的動態sql語句結果發現個問題。在mybatis中  or 的位置不一樣也會影響查詢結果。上代碼：

這是有問題的代碼

    <select id="queryComissionRecord" resultType="ComissionRecordResult">
        select
        sum(t.amount) as transferAmount,
        t.agentName as agentName,
        t.tillNumber as
        tillNumber,
        t.agentRealName as realName,
        count(*) as transactionNumber,
        sum(t.comission) as
        agentComissionAmount,
        sum(t.parentComission) as
        superAgentComissionAmount

        from comission_record t

        where
        1=1
        <if test="name != null and name != ''"> and t.agentName=#{name} or t.agentRealName=#{name} </if>
        <if test="tillNumber != null and tillNumber != ''">
            and
            t.tillNumber=#{tillNumber}
        </if>
        and t.parentTillNumber=#{supAgentTillNumber}
        and DATE_FORMAT(
        startTime, '%Y%m' ) = DATE_FORMAT(#{month} , '%Y%m' )
        and t.status in (0)

        group by agentName
        order by tillNumber desc

    </select>

這是沒問題的代碼1

    <select id="queryComissionRecord" resultType="ComissionRecordResult">
        select
        sum(t.amount) as transferAmount,
        t.agentName as agentName,
        t.tillNumber as
        tillNumber,
        t.agentRealName as realName,
        count(*) as transactionNumber,
        sum(t.comission) as
        agentComissionAmount,
        sum(t.parentComission) as
        superAgentComissionAmount

        from comission_record t

        where
        1=1
        <if test="tillNumber != null and tillNumber != ''">
            and
            t.tillNumber=#{tillNumber}
        </if>
        and t.parentTillNumber=#{supAgentTillNumber}
        and DATE_FORMAT(
        startTime, '%Y%m' ) = DATE_FORMAT(#{month} , '%Y%m' )
        and t.status in (0)
        <if test="name != null and name != ''"> and t.agentName=#{name} or t.agentRealName=#{name} </if>
        group by agentName
        order by tillNumber desc

    </select>

沒問題代碼2

    <select id="queryComissionRecord" resultType="ComissionRecordResult">
        select
        sum(t.amount) as transferAmount,
        t.agentName as agentName,
        t.tillNumber as
        tillNumber,
        t.agentRealName as realName,
        count(*) as transactionNumber,
        sum(t.comission) as
        agentComissionAmount,
        sum(t.parentComission) as
        superAgentComissionAmount

        from comission_record t

        where
        1=1
        <if test="name != null and name != ''"> and (t.agentName=#{name} or t.agentRealName=#{name}) </if>
        <if test="tillNumber != null and tillNumber != ''">
            and
            t.tillNumber=#{tillNumber}
        </if>
        and t.parentTillNumber=#{supAgentTillNumber}
        and DATE_FORMAT(
        startTime, '%Y%m' ) = DATE_FORMAT(#{month} , '%Y%m' )
        and t.status in (0)
        group by agentName
        order by tillNumber desc

    </select>

 

 

兩份代碼的不一樣之處就在於，下劃線部分的代碼的位置不同，若是放在前面，一旦name不爲空的時候，條件開啓，or 就會把後面全部的條件都當成or的一部分。結果會有很大差別。

或者也能夠和第三種同樣，括號優先一下。

在此小記一下，也幫助新手填坑吧。