今天执行批量插入的操作,发现报了错 mysql Column count doesn't match value count at row 1。

后来发现原因:是由于写的SQL语句里列的数目和后面的值的数目不一致, 比如insert into 表名 (field1,field2,field3) values('a','b')这样前面的是三列,后面却只有二个值,这就会出现这个错误的。

查看mapper写法

 <insert id="insertBatch" useGeneratedKeys="true" parameterType="java.util.List">
INSERT INTO sys_basic_info(
<include refid="dbColumns" />
) VALUES
<foreach collection="list" item="item" index="index" open="(" separator="," close=")">
#{item.groupId},
#{item.groupName},
#{item.groupCode}
</foreach>
</insert>

原因很容易发现,foreach标签属性open和close配置有误!这样大括号会把整体包起来,正确应为:

 <insert id="insertBatch" useGeneratedKeys="true" parameterType="java.util.List">
INSERT INTO sys_basic_info(
<include refid="dbColumns" />
) VALUES
<foreach collection="list" item="item" index="index" separator=",">
(
#{item.groupId},
#{item.groupName},
#{item.groupCode}
)
</foreach>
</insert>

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