主流数据库在mybatis中LIKE模糊查询的几种写法

1. oracle

<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>

2. 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>

3. 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>

4. db2 （与oracle相同）

<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>