我使用 PostgreSQL 10 并且CREATE EXTENSION unaccent;成功运行。我有一个包含以下内容的 plgsql 函数
whereText := 'lower(unaccent(place.name)) LIKE lower(unaccent($1))';
之后，根据用户的选择，可能会在whereText.
最终whereText在查询中使用：
placewithkeys := '%'||placename||'%';
RETURN QUERY EXECUTE format('SELECT id, name FROM '||fromText||' WHERE '||whereText)
USING placewithkeys , event, date;
即使我删除了零件，它whereText := 'LOWER(unaccent(place.name)) LIKE LOWER(unaccent($1))';也不起作用。LOWER
我这样做select __my_function('Τζι');了，但我什么也没得到，即使我应该得到结果，因为在数据库中有名字Τζίμα
如果我删除unaccent并保留它，它LOWER可以工作，但不适用于重音：按原样恢复。似乎是引起了问题。τζΤζίμαunaccent
我错过了什么？我怎样才能解决这个问题？
由于有关于语法和可能的 SQLi 的评论，我提供了整个函数定义，现在更改为在希腊语中不区分重音和不区分大小写：
CREATE FUNCTION __a_search_place
(placename text, eventtype integer, eventdate integer, eventcentury integer, constructiondate integer, constructioncentury integer, arstyle integer, artype integer)
RETURNS TABLE
(place_id bigint, place_name text, place_geom geometry)
AS $$
DECLARE
selectText text;
fromText text;
whereText text;
usingText text;
placewithkeys text;
BEGIN
fromText := '
place
JOIN cep ON place.id = cep.place_id
JOIN event ON cep.event_id = event.id
';
whereText := 'unaccent(place.name) iLIKE unaccent($1)';
placewithkeys := '%'||placename||'%';
IF constructiondate IS NOT NULL OR constructioncentury IS NOT NULL OR arstyle IS NOT NULL OR artype IS NOT NULL THEN
fromText := fromText || '
JOIN construction ON cep.construction_id = construction.id
JOIN construction_atype ON construction.id = construction_atype.construction_id
JOIN construction_astyle ON construction.id = construction_astyle.construction_id
JOIN atype ON atype.id = construction_atype.atype_id
JOIN astyle ON astyle.id = construction_astyle.astyle_id
';
END IF;
IF eventtype IS NOT NULL THEN
whereText := whereText || 'AND event.type = $2 ';
END IF;
IF eventdate IS NOT NULL THEN
whereText := whereText || 'AND event.date = $3 ';
END IF;
IF eventcentury IS NOT NULL THEN
whereText := whereText || 'AND event.century = $4 ';
END IF;
IF constructiondate IS NOT NULL THEN
whereText := whereText || 'AND construction.date = $5 ';
END IF;
IF constructioncentury IS NOT NULL THEN
whereText := whereText || 'AND construction.century = $6 ';
END IF;
IF arstyle IS NOT NULL THEN
whereText := whereText || 'AND astyle.id = $7 ';
END IF;
IF artype IS NOT NULL THEN
whereText := whereText || 'AND atype.id = $8 ';
END IF;
whereText := whereText || '
GROUP BY place.id, place.geom, place.name
';
RETURN QUERY EXECUTE format('SELECT place.id, place.name, place.geom FROM '||fromText||' WHERE '||whereText)
USING placewithkeys, eventtype, eventdate, eventcentury, constructiondate, constructioncentury, arstyle, artype ;
END;
$$
LANGUAGE plpgsql;