标签：name 标签 age emp SQL MyBatis id select
if 标签
<select id="getEmpByCondition" resultType="com.xy.mybatis.dynamic.pojo.Emp">
select * from emp
where 1 = 1
<if test="name != '' and name != null">
and name = #{name}
</if>
<if test="age != '' and age != null">
and age = #{age}
</if>
</select>
where 标签
<select id="getEmpByCondition" resultType="com.xy.mybatis.dynamic.pojo.Emp">
select * from emp
<where>
<if test="name != '' and name != null">
name = #{name}
</if>
<if test="age != '' and age != null">
and age = #{age}
</if>
</where>
</select>
trim 标签
<select id="getEmpByCondition" resultType="com.xy.mybatis.dynamic.pojo.Emp">
select * from emp
<trim prefix="where" suffixOverrides="and" prefixOverrides="and" suffix="order by id desc">
<if test="name != '' and name != null">
name = #{name}
</if>
<if test="age != '' and age != null">
and age = #{age}
</if>
</trim>
</select>
choose、when、otherwise 标签
<select id="getEmpByChoose" resultType="com.xy.mybatis.dynamic.pojo.Emp">
select * from emp
<where>
<choose>
<when test="name != '' and name != null and age != '' and age != null">
name = #{name} and age = #{age}
</when>
<when test="age != '' and age != null">
age = #{age}
</when>
<when test="name != '' and name != null">
name = #{name}
</when>
<otherwise>
1 = 1
</otherwise>
</choose>
</where>
</select>
foreach 标签
<select id="getEmpByIds" resultType="com.xy.mybatis.dynamic.pojo.Emp">
select * from emp
<foreach collection="ids" item="id" open="where id in (" close=")" separator=",">
#{id}
</foreach>
</select>
sql、include 标签
<sql id="base">
select id, name, age
from emp
</sql>
<select id="getEmpByIds" resultType="com.xy.mybatis.dynamic.pojo.Emp">
<include refid="base"/>
<foreach collection="ids" item="id" open="where id in (" close=")" separator=",">
#{id}
</foreach>
</select>
标签：name,
标签,
age,
emp,
SQL,
MyBatis,
id,
select
From： https://blog.51cto.com/learningfish/6105771