mybaitis动态sql利用bind标签代替%拼接完成模糊查询

　　Oracle中使用bind的写法

<select id="selectUser" resultType="user" parameterType="user">
  <bind name="pattern" value="'%' + username + '%'" />
  select id,sex,age,username,password
  from user
  where username LIKE #{pattern}
</select>

　　Oracle中不使用bind的写法

　　

<select id="selectUser" resultType="user" parameterType="user">
  select id,sex,age,username,password
  from user
  where username LIKE  CONCAT(CONCAT('%',#{username}),'%')
</select>