<select id="select1" resultType="BaseresultMap"> 
 SELECT * FROM User WHERE Age = ‘18' 
 <if test="name != null"> 
 AND name like #{name} 
 </if> 
</select> 

<select id="select2" resultType="BaseresultMap"> 
 SELECT * FROM User WHERE Age = ‘18' 
 
 <choose> 
 <when test="Job != null"> 
 AND Job =#{Job} 
 </when> 
 <otherwise> 
 AND Job="none" 
 
 </otherwise> 
 </choose> 
</select> 

 <select id="select5" resultType="BaseresultBase"> 
 select * from User where id in 
 <foreach collection="list" index="index" item="item" open="(" separator="," close=")"> 
  #{item} 
 </foreach> 
 </select> 
 
public List<User> select5(List<Integer> ids); 

<select id="select3" resultType="BaseresultMap"> 
 SELECT * FROM User 
<where> 
 
 <if test="Age != null"> 
 Age = #{Age} 
 </if> 
 <if test="Job != null"> 
 AND Job like #{Job} 
 </if> 
 
<where> 
</select> 
 
<update id="update1"> 
 update User 
 <set> 
 <if test="username != null">username=#{username},</if> 
 <if test="password != null">password=#{password},</if> 
 <if test="Age != null">Age =#{Age}</if> 
 </set> 
 where id=#{id} 
</update> 

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