<if test="userRole != null and userId != null"> case #{userRole} when "SALES_STAFF" then (and a.salesmanId = #{userId}) when "FINANCE_STAFF" then (and a.financeId = #{userId}) when "DESIGN_STAFF" then (and a.designId = #{userId}) when "PRODUCTION_STAFF" then (and a.produceId = #{userId}) when "TEST_STAFF" then (and a.testId = #{userId}) when "AFTER_SALE_STAFF" then (and a.ministerId = #{userId}) end </if> userRole = "SALES_STAFF" userId = 11 形成的sql
时间: 2024-04-08 20:30:08 浏览: 16
根据您提供的信息,形成的SQL语句如下:
```sql
case #SALES_STAFF
when "SALES_STAFF" then (and a.salesmanId = 11)
when "FINANCE_STAFF" then (and a.financeId = 11)
when "DESIGN_STAFF" then (and a.designId = 11)
when "PRODUCTION_STAFF" then (and a.produceId = 11)
when "TEST_STAFF" then (and a.testId = 11)
when "AFTER_SALE_STAFF" then (and a.ministerId = 11)
end
```
请注意,这只是一个片段,可能还有其他的SQL语句部分。
相关问题
SELECT u.*, g.group_name, l.name as level_name FROM eb_user u LEFT JOIN eb_user_group g ON u.group_id = g.id LEFT JOIN eb_system_user_level l ON u.`level` = l.id <where> <if test="nickname!=null and nickname!=''"> u.real_name CONCAT('%',nickname,'%') or u.phone = nickname </if> <if test="loginType!=null and loginType!=''"> and u.user_type = loginType </if> <if test="level!=null"> and u.level = level </if> <if test="groupId!=null and groupId!=''"> and u.group_id = groupId </if> <if test="tagId!=null"> and u.tag_id in(tagId) </if> <if test="cardId!=null and cardId!=''"> and u.is_promoter = cardId </if> <if test="country!=null and country!=''"> and u.country = country </if> <if test="sex!=4"> and u.sex = sex </if> </where>你把它优化一下,同时把优化后的代码给我
好的,我将对您提供的查询进行优化,并提供优化后的代码:
```sql
SELECT
u.*,
g.group_name,
l.name AS level_name
FROM
eb_user u
LEFT JOIN eb_user_group g ON u.group_id = g.id
LEFT JOIN eb_system_user_level l ON u.`level` = l.id
WHERE
1 = 1
<if test="nickname!=null and nickname!=''">
AND (u.real_name LIKE CONCAT('%', #{nickname}, '%') OR u.phone = #{nickname})
</if>
<if test="loginType!=null and loginType!=''">
AND u.user_type = #{loginType}
</if>
<if test="level!=null">
AND u.level = #{level}
</if>
<if test="groupId!=null and groupId!=''">
AND u.group_id = #{groupId}
</if>
<if test="tagId!=null">
AND u.tag_id IN
<foreach item="item" collection="tagId" open="(" close=")" separator=",">
#{item}
</foreach>
</if>
<if test="cardId!=null and cardId!=''">
AND u.is_promoter = #{cardId}
</if>
<if test="country!=null and country!=''">
***
优化语句<update id="updateByPrimaryKey" parameterType="com.example.demo.domain.Permission"> update sys_permission <set> <if test="permission_id!=null"> permission_id = #{permission_id}, </if> <if test="pid!=null"> pid = #{pid}, </if> <if test="name!=null"> name = #{name}, </if> <if test="type!=null"> type = #{type}, </if> <if test="permission_value!=null"> permission_value = #{permission_value}, </if> <if test="uri!=null"> uri = #{uri}, </if> <if test="icon!=null"> icon = #{icon}, </if> <if test="status!=null"> status = #{status}, </if> <if test="ctime!=null"> ctime = #{ctime}, </if> <if test="orders!=null"> orders = #{orders}, </if> <if test="system_id!=null"> system_id = #{system_id} </if> </set> where permission_id = #{permission_id} </update>
这段MyBatis XML中的SQL语句看起来已经比较优化了,但还有一些可以改进的地方。下面是一些建议:
1. 使用`<trim>`标签:在`<set>`标签中,每个`<if>`标签都会生成一个逗号,最后一个`<if>`标签需要特殊处理。可以使用`<trim>`标签来解决这个问题,示例代码如下:
```xml
<set>
<trim suffixOverrides="," suffix=" ">
<if test="permission_id!=null">
permission_id = #{permission_id},
</if>
<if test="pid!=null">
pid = #{pid},
</if>
<!-- 其他属性 -->
<if test="system_id!=null">
system_id = #{system_id}
</if>
</trim>
</set>
```
上面的代码中,使用了`suffixOverrides`属性来删除每个`<if>`标签生成的逗号。同时,使用了`suffix`属性来在最后一个属性后面添加一个空格。
2. 使用`<foreach>`标签:如果要更新的字段比较多,可以使用`<foreach>`标签来生成`<if>`标签,减少重复代码。示例代码如下:
```xml
<set>
<foreach collection="updateFields" item="field">
<if test="field=='permission_id'">
permission_id = #{permission_id},
</if>
<if test="field=='pid'">
pid = #{pid},
</if>
<!-- 其他属性 -->
<if test="field=='system_id'">
system_id = #{system_id}
</if>
</foreach>
</set>
```
上面的代码中,`updateFields`是一个`List<String>`类型的变量,存储需要更新的字段名。使用`<foreach>`标签遍历`updateFields`,生成对应的`<if>`标签。
3. 使用动态SQL:如果更新的条件和更新的字段都不确定,可以使用动态SQL来生成SQL语句。示例代码如下:
```xml
<update id="updatePermission" parameterType="Map">
UPDATE sys_permission
<set>
<foreach collection="updateFields" item="field">
${field} = #{${field}},
</foreach>
</set>
<where>
1=1
<foreach collection="conditions" item="condition" separator="AND">
${condition.field} ${condition.operator} #{condition.value}
</foreach>
</where>
</update>
```
上面的代码中,`updateFields`和`conditions`都是存储在`Map`中的变量,分别表示需要更新的字段和更新的条件。使用`${}`语法来插入动态SQL。