7.18. URL Functions

Extraction Functions

The URL extraction functions extract components from HTTP URLs(or any valid URIs conforming to RFC 2396).The following syntax is supported:

  1. [protocol:][//host[:port]][path][?query][#fragment]

The extracted components do not contain URI syntax separatorssuch as : or ?.

  • url_extract_fragment(url) → varchar
  • Returns the fragment identifier from url.
  • url_extract_host(url) → varchar
  • Returns the host from url.
  • url_extract_parameter(url, name) → varchar
  • Returns the value of the first query string parameter named namefrom url. Parameter extraction is handled in the typical manneras specified by RFC 1866#section-8.2.1.
  • url_extract_path(url) → varchar
  • Returns the path from url.
  • url_extract_port(url) → bigint
  • Returns the port number from url.
  • url_extract_protocol(url) → varchar
  • Returns the protocol from url.
  • url_extract_query(url) → varchar
  • Returns the query string from url.

Encoding Functions

  • urlencode(value) → varchar
  • Escapes value by encoding it so that it can be safely included inURL query parameter names and values:
    • Alphanumeric characters are not encoded.
    • The characters ., -, * and are not encoded.
    • The ASCII space character is encoded as +.
    • All other characters are converted to UTF-8 and the bytes are encodedas the string %XX where XX is the uppercase hexadecimalvalue of the UTF-8 byte.
  • url_decode(value) → varchar
  • Unescapes the URL encoded value.This function is the inverse of url_encode().