mybatis动态sql问题 求解？

Question

select * from table a where a.project_id=#{projectId} and a.id != #{id} and a.status=3 and a.id_card = #{code} or a.unit_code = #{code}

select * from table a where a.project_id=#{projectId} and a.id != #{id} and a.status=3 and

<if test="type == 'idCard'">a.id_card = #{code}</if>
<if test="type == 'unitCode'">a.unit_code = #{code}</if>

---

<if test="type == idCard">a.id_card = #{code}</if>
<if test="type == unitCode">a.unit_code = #{code}</if>

---

<if test='type == "idCard"'>a.id_card = #{code}</if>
<if test='type == "unitCode"'>a.unit_code = #{code}</if>

下面的sql是对上面的优化 但是这样写运行时会把错（3种都会badSql） 求大佬解答

Answer 1

select * from table a 
<where>
 a.project_id=#{projectId}
 and a.id != #{id}
 and a.status=3 
<choose>
    <when test="type == idCard"> 
        and a.id_card = #{code}
    </when>
<when test="type == unitCode">and a.unit_code = #{code}</when>
    <otherwise>  
    </otherwise>  
</choose>
</where>

Answer 2

<choose>

<when>