从字符串中提取category_id编号

Question

我有这样的字符串：

PRODUCT_ID =
CATEGORY_ID = 340
flypage =
页=
PAGE_TITLE =
show_page_title = 1
pageclass_sfx =
menu_image = -1
固定= 0

如何提取category_id？我试图从字段中获取数值，但我得到340110而不是340

Answer 1

如果您要从上面的模式中提取值，看起来它们与\n分开，您可以获得值

mysql> select substring_index(substring_index('product_id=
category_id=340
flypage=
page=
page_title=
show_page_title=1
pageclass_sfx=
menu_image=-1
secure=0','category_id=','-1'),'\n',1) as val;
+-----+
| val |
+-----+
| 340 |
+-----+
1 row in set (0.00 sec)

您可以在查询中使用

select substring_index(substring_index(col_name,'category_id=','-1'),'\n',1) as val;