在xml中，特殊符號的轉義寫法如下：

    &lt;          < 
    &gt;          >  
    &lt;&gt;      <>
    &amp;         & 
    &apos;        '
    &quot;        "

也可以使用<![CDATA[ ]]>符號進行說明，將此類符號不進行解析

<![CDATA[ sql語句 ]]>  

• 1

mysql like的寫法：

1.傳入引數中直接加入%%

    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標籤

<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

 like concat('%',#{param},'%')