标签：update display alt one enable efi result sed 后缀
trim
prefix="SET"前缀设置为SET
suffixOverrides="," 去掉最后的,
suffix : 后缀设置
prefixOverrides ：去掉前缀多余的
<update id="updateUser1" parameterType="user"> UPDATE `USER` <trim prefix="SET" suffixOverrides=","> <if test="name != null and name != ‘‘"> `NAME` = #{name}, </if> <if test="password != null and password != ‘‘"> `PASSWORD` = #{password}, </if> <if test="email != null and email != ‘‘"> `EMAIL` = #{email}, </if> </trim> WHERE `USER_ID` = #{id} </update>
<update id="updateUser2" parameterType="user">
UPDATE `USER`
<trim prefix="SET" suffixOverrides="," suffix="WHERE `USER_ID` = #{id}">
<if test="name != null and name != ‘‘">
`NAME` = #{name},
</if>
<if test="password != null and password != ‘‘">
`PASSWORD` = #{password},
</if>
<if test="email != null and email != ‘‘">
`EMAIL` = #{email},
</if>
</trim>
</update>
set
默认去掉最后的，
<update id="updateUser" parameterType="user"> UPDATE `USER` <set> <if test="name != null and name != ‘‘"> `NAME` = #{name}, </if> <if test="password != null and password != ‘‘"> `PASSWORD` = #{password}, </if> <if test="email != null and email != ‘‘"> `EMAIL` = #{email}, </if> </set> WHERE `USER_ID` = #{id} </update>
where
如果name为null或者为‘‘<where>后面的内容将无效
如果name有值<where>标签将会自动加上where
<select id="selectByName" parameterType="string" resultType="user">
SELECT
t_user.`USER_ID` id,
t_user.`NAME` name,
t_user.`PASSWORD` password,
t_user.`EMAIL` email,
t_user.`LOCKED` locked,
t_user.`ENABLED` enabled,
t_user.`EXPIRATION` expiration,
t_user.`CREATEDATE` createDate
FROM
`USER` AS t_user
<where>
<if test="name != null and name != ‘‘">
t_user.`NAME` = #{name}
</if>
</where>
</select>
标签：update display alt one enable efi result sed 后缀
原文地址：http://www.cnblogs.com/cainiaoYY/p/7288424.html
