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一对多关系写成一行数据，强行埋坑，下面是我的解决办法,在效率方面这样肯定不如好好构建数据关系，正常去做的快，如果可以我建议你去重构数据表结构 :
)
1.mysql
首先创建一个存储过程，可以将分隔的数据行插入到一个临时表中
CREATE DEFINER=`xl`@`127.0.0.1` PROCEDURE `split`( IN _string VARCHAR ( 256 )
) BEGIN #求分割符号','的位置 DECLARE _index INT;#使用临时表存储分割后的结果 DROP TEMPORARY TABLE IF
EXISTS tmp_strs; CREATE TEMPORARY TABLE tmp_strs ( name VARCHAR (40)); SET
_index = locate( ',', _string ); WHILE _index > 0 DO INSERT INTO tmp_strs
VALUES ( LEFT ( _string, _index - 1 ) );#将子字符串存入临时表 SET _string = substr(
_string FROM _index + 1 ); SET _index = locate( ',', _string ); END WHILE; IF
length( _string ) >= 0 THEN INSERT INTO tmp_strs VALUES ( _string ); END IF; END
然后调用这个存储过程，将数据行插入到tmp_strs临时表中，我使用的是mybatis调用存储过程
<select id="updateTmpTable" statementType="CALLABLE"> CALL split(#{record})
</select>
然后调用查询tmp_strs表就OK了
2.oracle
oracle数据库就简单了，使用regexp_substr函数就能做到这个效果
SELECT regexp_substr('110,112,113,114','[^,]+',1,LEVEL) name FROM dual CONNECT
BY regexp_substr('110,112,113,114','[^,]+',1,LEVEL) IS NOT NULL
