mybatis由于简单易用性得到大家的认可和使用

但是在批量更新操作中，网上介绍的貌似不全，正好今天做个记录，大家一起进步

在实际项目开发过程中，常有这样的需求：根据ids更新表的某一个字段值，这时的sql语句是：

1.  
   public interface IStaffDao {
2.  
   void batchUpdate(@Param("list") List<Long> list);
3.  
   }

1.  
   <select id="getStaffsByIds" resultMap="staff_Mapper">
2.  
   update staff set status = 0 where id in
3.  
   <foreach collection="list" item="item" index="index" open="(" separator="," close=")" >
4.  
   #{item}
5.  
   </foreach>
6.  
   ORDER BY id
7.  
   </select>

还有一种情况：根据ids更新表的多个值，并且每个id对应的值也不一样，这时上述语句已经满足不了需求，需要另一种批量更新sql语句

1.  
   public interface IStaffDao {
2.  
   void batchUpdate(@Param("list") List<Staff> list);
3.  
   }

1.  
   <update id="batchUpdate" parameterType="java.util.List" >
2.  
   <foreach collection="list" item="item" index="index" separator=";">
3.  
   UPDATE staff set count = #{item.count} , code = #{item.code} , invalid_time = #{item.time} WHERE id = #{item.id}
4.  
   </foreach>
5.  
   </update>

由于这种批量更新是一次执行多个update语句，所以mybatis需要额外的配置：

在spring.datasource.url后加上allowMultiQueries=true
如：jdbc:mysql://10.10.20.36:3306/test?allowMultiQueries=true

否则，在执行sql语句时，会报下面的错误

1.  
   [org.apache.ibatis.session.defaults.DefaultSqlSession@76a2f910]
2.  
   org.springframework.jdbc.BadSqlGrammarException:
3.  
   ### 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 b_email_msg_remind
4.  
   SET send_status = 1, send_email_code='abc@abc.abc'' at line 6
5.  
   ### The error may involve com.hhsoft.sectionservice.model.persistence.EmailMapper.updateEmailTasks-Inline
6.  
   ### The error occurred while setting parameters
7.  
   ### 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 staff
8.  
   SET status = 1, send_email_code='abc@abc.abc';<span style="font-family: Helvetica, Tahoma, Arial, sans-serif;">update sta<span style="font-size:10px;">ff SET status = 2,</span> send_email_code='test@qq.com' </span>' at line 6
9.  
   ; 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 b_email_msg_remind
10.  
    SET send_status = 1, send_email_code='abc@abc.abc'' at line