批量更新sql

<update id="updateAutoAppraiseInfo" parameterType="Object">
<foreach collection="appraises" item="appraise" index="appraises" separator=";">
UPDATE project_auto_appraise SET
<trim suffixOverrides=",">
<if test="appraise.artificialValuation != null and appraise.artificialValuation != '' ">
artificial_valuation=#{appraise.artificialValuation},
</if>
<if test="appraise.difference != null and appraise.difference != ''">
difference=#{appraise.difference},
</if>
<if test="appraise.remark != null and appraise.remark != ''">
remark=#{appraise.remarks},
</if>
</trim>
WHERE sum_project_id=#{sumProjectId} AND media_code = #{appraise.mediaType}
</foreach>
</update>

看起来并没有什么问题，但是运行会发现报错，错误信息如下

org.springframework.jdbc.BadSqlGrammarException:
### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UPDATE project_auto_appraise SET
artificial_valuation=201
WHERE sum_proj' at line 5
### The error may involve com.jd.dlink.dao.mapper.project.ProjectAutoAppraiseMapper.updateAutoAppraiseInfo-Inline
### The error occurred while setting parameters
### SQL: UPDATE project_auto_appraise SET artificial_valuation=? WHERE sum_project_id=? AND media_code = ? ; UPDATE project_auto_appraise SET artificial_valuation=? WHERE sum_project_id=? AND media_code = ?
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UPDATE project_auto_appraise SET
artificial_valuation=201
WHERE sum_proj' at line 5
; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UPDATE project_auto_appraise SET
artificial_valuation=201
WHERE sum_proj' at line 5

调试之后，发现只要传一个值进去就没有问题，就是list的成员只有一个。就想着是数据库配置的问题

将数据库配置修改为 jdbc.url=jdbc:mysql://127.0.0.1:3306/datebase?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&allowMultiQueries=true

新增了 &allowMultiQueries=true 意为 允许批量更新

就 ok 了