NET_HOST

命令格式

STRING NET_HOST(STRING <url>)

参数说明

url：必填。STRING类型。待解析的URL字符串。

返回值说明

返回STRING类型。解析给定的URL并返回其中的主机名部分。

• 若包含端口号，端口号也会保留在返回结果中。

• 若函数无法解析输入的URL，则返回NULL。

相关解析函数

若需要解析URL中除主机名的其他部分，可以使用如下函数：

• NET_PUBLIC_SUFFIX：解析给定的URL中的公共后缀（如com、org或net）。

• NET_REG_DOMAIN： 解析给定的URL中已注册或可注册的域名（即公共后缀加上前一级标签）。

使用示例

SELECT input
,description
,NET_HOST(input) AS HOST
,NET_PUBLIC_SUFFIX(input) AS SUFFIX
,NET_REG_DOMAIN(input) AS DOMAIN  
FROM (
  SELECT "" AS input, "invalid input" AS description
  UNION ALL SELECT "http://abc.xyz", "standard URL"
  UNION ALL SELECT "//user:password@a.b:80/path?query",
                   "standard URL with relative scheme, port, path and query, but no public suffix"
  UNION ALL SELECT "https://[::1]:80", "standard URL with IPv6 host"
  UNION ALL SELECT "http://例子.卷筒纸.中国", "standard URL with internationalized domain name"
  UNION ALL SELECT "    www.Example.Co.UK    ",
                   "non-standard URL with spaces, upper case letters, and without scheme"
  UNION ALL SELECT "mailto:?to=&subject=&body=", "URI rather than URL--unsupported"
);
                         

+-----------------------------------+-------------------------------------------------------------------------------+-------------------+------------+---------------+
| input                             | description                                                                   | host              | suffix     | domain        | 
+-----------------------------------+-------------------------------------------------------------------------------+-------------------+------------+---------------+
|                                   | invalid input                                                                 | NULL              | NULL       | NULL          | 
| http://abc.xyz                    | standard URL                                                                  | abc.xyz           | xyz        | abc.xyz       | 
| //user:password@a.b:80/path?query | standard URL with relative scheme, port, path and query, but no public suffix | a.b               | NULL       | NULL          | 
| https://[::1]:80                  | standard URL with IPv6 host                                                   | [::1]             | NULL       | NULL          | 
| http://例子.卷筒纸.中国             | standard URL with internationalized domain name                               | 例子.卷筒纸.中国     | 中国       | 卷筒纸.中国     | 
|         www.Example.Co.UK         | non-standard URL with spaces, upper case letters, and without scheme          | www.Example.Co.UK | Co.UK      | Example.Co.UK | 
| mailto:?to=&subject=&body=        | URI rather than URL--unsupported                                              | mailto            | NULL       | NULL          | 
+-----------------------------------+-------------------------------------------------------------------------------+-------------------+------------+---------------+

相关函数

NET_HOST函数属于网络函数，更多网络相关函数请参见网络函数。