Mybatis中oracle、mysql、db2、sql server的like模糊查询

<!-- oracle 注意concat括号的书写位置-->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
select * from t_user where user_name like CONCAT(CONCAT('%',#{search_name}),'%')
</select>
<!-- 或者 -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
select * from t_user where user_name like '%'||#{search_name}||'%'
</select>

<!-- mysql -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
select * from t_user where user_name like CONCAT('%',#{search_name},'%')
</select>

<!-- ****分割线以上代码,都是我亲测确保无误的,分割线以下代码复制于原链接******** -->

<!-- sql server -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
select * from t_user where user_name like '%'+#{search_name}+'%'
</select>

<!-- db2 -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
select * from t_user where user_name like CONCAT('%',#{search_name},'%')
</select>
<!-- 或者 -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
select * from t_user where user_name like '%'||#{search_name}||'%'
</select>