SQLserver字符串分割自定义函数课后.doc

SQL server字符串分割函数 一、按指定符号分割字符串，返回分割后的元素个数，方法很简单，就是看字符串中存在多少个分隔符号，然后再加一，就是要求的结果。CREATE?function?Get_StrArrayLength @str?varchar 1024 ,??--要分割的字符串??@split?varchar 10 ??--分隔符号 returns?intasbegin??declare?@location?int??declare?@start?int??declare?@length?int??set?@str ltrim rtrim @str set?@location charindex @split,@str ??set?@length 1??while?@location 0??begin set?@start @location+1 set?@location charindex @split,@str,@start set?@length @length+1??end??return?@lengthend调用示例：select?dbo.Get_StrArrayLength 78,1,2,3,, 返回值：4二、按指定符号分割字符串，返回分割后指定索引的第几个元素，象数组一样方便CREATE?function?Get_StrArrayStrOfIndex @str?varchar 1024 ,??--要分割的字符串??@split?varchar 10 ,??--分隔符号??@index?int?--取第几个元素 returns?varchar 1024 asbegin??declare?@location?int??declare?@start?int??declare?@next?int??declare?@seed?int??set?@str ltrim rtrim @str set?@start 1??set?@next 1??set?@seed len @split set?@location charindex @split,@str ??while?@location 0?and?@index @next??begin set?@start @location+@seed set?@location charindex @split,@str,@start set?@next @next+1??end??if?@location? 0?select?@location? len @str +1?--这儿存在两种情况：1、字符串不存在分隔符号?2、字符串中存在分隔符号，跳出while循环后，@location为0，那默认为字符串后边有一个分隔符号。 return?substring @str,@start,@location-@start end调用示例：select?dbo.Get_StrArrayStrOfIndex 8,9,4,,,2 返回值：9三、结合上边两个函数，象数组一样遍历字符串中的元素create???function???f_splitstr @SourceSql???varchar 8000 ,@StrSeprate???varchar 100 returns???@temp???table F1???varchar 100 as begin declare???@ch???as???varchar 100 set???@SourceSql @SourceSql+@StrSeprate while @SourceSql begin set???@ch left @SourceSql,charindex ,,@SourceSql,1 -1 insert???@temp???values @ch set???@SourceSql stuff @SourceSql,1,charindex ,,@SourceSql,1 , end return end ----调用??select???*???from???dbo.f_splitstr 1,2,3,4,, ?--结果：1234 来自：Trackback:?/TrackBack.aspx?PostId 1639974