动态SQL空参数

Question

我创建表TELPOOL记录的列：

• POOLID，VARCHAR
• POOLNAME，VARCHAR
• 池类型，VARCHAR
• PAIRPOOLID，VARCHAR

如果poolPO.pairPoolID为空，则像这样插入

INSERT INTO TELPOOL (POOLID, POOLNAME, POOLTYPE) 
    VALUES (#{poolPO.id}, #{poolPO.name}, #{poolPO.poolType} 

否则，

INSERT INTO TELPOOL (POOLID, POOLNAME, POOLTYPE, PAIRPOOLID) 
    VALUES (#{poolPO.id}, #{poolPO.name}, #{poolPO.poolType}, #{poolPO.pairPoolID}) 

我如何处理这两种situactions由单一的动态SQL？

Answer 1

下面是使用MyBatis条件的解决方案。映射器XML中仍有两个SQL，但上层代码不需要任何更改。

<insert id="createTelPool" flushCache="true" > 
    <if test="poolPO.pairPoolID != null" > 
     INSERT INTO WBXTELPOOL (POOLID, POOLNAME, POOLTYPE, PAIRPOOLID) 
      VALUES (#{poolPO.id}, #{poolPO.name}, #{poolPO.poolType}, #{poolPO.pairPoolID}) 
    </if> 
    <if test="poolPO.pairPoolID == null" > 
     INSERT INTO WBXTELPOOL (POOLID, POOLNAME, POOLTYPE) 
      VALUES (#{poolPO.id}, #{poolPO.name}, #{poolPO.poolType}) 
    </if> 
</insert>