Question

mybatis 里如何连接字符串

Answer 1

mybatis做like模糊查询
1. 参数中直接加入%%
param.setUsername("%CD%");
param.setPassword("%11%");
<select id="selectPersons" resultType="person" parameterType="person">
select id,sex,age,username,password from person where true
<if test="username!=null"> AND username LIKE #{username}</if>
<if test="password!=null">AND password LIKE #{password}</if>

</select>

2. bind标签
<select id="selectPersons" resultType="person" parameterType="person">
<bind name="pattern" value="'%' + _parameter.username + '%'" />
select id,sex,age,username,password
from person
where username LIKE #{pattern}
</select>

3. CONCAT
where username LIKE concat(concat('%',#{username}),'%')