cartodb4/cartodb-postgresql
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Reworks _CDB_Octet_Trim 173

Browse Source
This commit is contained in:
Guido Fioravantti
2015-10-26 16:35:33 +01:00
parent 710a3c9672
commit 2e701f73ba
1 changed files with 16 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
scripts-available/CDB_Helper.sql
View File

@@ -18,7 +18,7 @@ BEGIN
usedspace := usedspace + coalesce(octet_length(prefix), 0);
usedspace := usedspace + coalesce(octet_length(suffix), 0);
relname := _CDB_Octet_Trim(relname, usedspace + octet_length(relname) - maxlen);
relname := _CDB_Trim_Octets(relname, usedspace + octet_length(relname) - maxlen);
IF relname = '' THEN
PERFORM _CDB_Error('prefixes are to long to generate a valid identifier', '_CDB_Unique_Identifier');
@@ -76,7 +76,7 @@ BEGIN
usedspace := usedspace + coalesce(octet_length(prefix), 0);
usedspace := usedspace + coalesce(octet_length(suffix), 0);
relname := _CDB_Octet_Trim(relname, usedspace + octet_length(relname) - maxlen);
relname := _CDB_Trim_Octets(relname, usedspace + octet_length(relname) - maxlen);
IF relname = '' THEN
PERFORM _CDB_Error('prefixes are to long to generate a valid identifier', '_CDB_Unique_Column_Identifier');
@@ -110,14 +110,15 @@ END;
$$ LANGUAGE 'plpgsql';
-- Trims the end of a given string by the given number of octets taking care
-- not to leave characters in half. UTF8 safe.
CREATE OR REPLACE FUNCTION cartodb._CDB_Octet_Trim(tostrip TEXT, octets INTEGER)
-- not to leave characters in half. If a negative or 0 amount of octects to trim
-- is specified, the suplied text is returned unaltered. UTF8 safe.
CREATE OR REPLACE FUNCTION cartodb._CDB_Trim_Octets(totrim TEXT, octets INTEGER)
RETURNS TEXT
AS $$
DECLARE
expected INTEGER;
examined INTEGER;
tostriplen INTEGER;
totrimlen INTEGER;
charlen INTEGER;
i INTEGER;
@@ -126,28 +127,28 @@ DECLARE
trimmed TEXT;
BEGIN
charlen := bit_length('a');
tostriplen := char_length(tostrip);
expected := tostriplen * charlen;
examined := bit_length(tostrip);
totrimlen := char_length(totrim);
expected := totrimlen * charlen;
examined := bit_length(totrim);
IF expected = examined OR octets = 0 THEN
RETURN SUBSTRING(tostrip from 1 for (tostriplen - octets));
ELSIF octets < 0 THEN
RETURN tostrip;
IF octets <= 0 THEN
RETURN totrim;
ELSIF expected = examined THEN
RETURN SUBSTRING(totrim from 1 for (totrimlen - octets));
ELSIF (octets * charlen) > examined THEN
RETURN '';
END IF;
i := tostriplen - ((octets - 1) / 2);
i := totrimlen - ((octets - 1) / 2);
LOOP
tail := SUBSTRING(tostrip from i for tostriplen);
tail := SUBSTRING(totrim from i for totrimlen);
EXIT WHEN octet_length(tail) >= octets OR i <= 0;
i := i - 1;
END LOOP;
trimmed := SUBSTRING(tostrip from 1 for (tostriplen - char_length(tail)));
trimmed := SUBSTRING(totrim from 1 for (totrimlen - char_length(tail)));
RETURN trimmed;
END;
$$ LANGUAGE 'plpgsql';