对MySQL函数substring_index(str,delim,count)的兼容
目录
环境
文档用途
详细信息
环境
系统平台:Microsoft Windows (64-bit) 2012
版本:5.6.5
文档用途
对MySQL函数substring_index(str,delim,count)进行兼容
详细信息
MySQL函数功能:按照关键字截取字符串,substring_index(被截取字段,关键字,关键字出现的次数)
HGDB函数:
create or replace function substring_index(text,text,int) returns text as $$
declare
a text;
b text :="";
var int;
begin
for var in 1..$3 loop
a=split_part($1,$2,var);
b=b || $2 || a;
end loop;
return substring(b from 2 for length(b));
end
$$ language plpgsql
例子:
MySQL:
mysql> select substring_index("fhafjkdalsfhiad,fjadsoj;f,adsf,dsfa","s",3);
+--------------------------------------------------------------+
| substring_index("fhafjkdalsfhiad,fjadsoj;f,adsf,dsfa","s",3) |
+--------------------------------------------------------------+
| fhafjkdalsfhiad,fjadsoj;f,ad |
+--------------------------------------------------------------+
1 row in set (0.00 sec)
HGDB:
highgo=# select substring_index("fhafjkdalsfhiad,fjadsoj;f,adsf,dsfa","s",3);
substring_index
------------------------------
fhafjkdalsfhiad,fjadsoj;f,ad
(1 行记录)
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