PostgreSQL函数子查询中未识别的变量？

工作解决方案：

CREATE OR REPLACE FUNCTION my_search(tsq tsquery, translation_id integer, lang regconfig, count integer DEFAULT 10, skip integer DEFAULT 0)
RETURNS TABLE(id int, chapter int, number int, headline text) AS $$
      SELECT id, chapter, number, ts_headline($3, text, $1, 'StartSel = <em>, StopSel = </em>'::text) FROM (
          SELECT id, chapter, number, text FROM lyrics
          WHERE $1 @@ search_text AND translation_id = $2
          LIMIT $4 OFFSET $5) AS matches;
$$ LANGUAGE SQL STABLE;

函数变量似乎不在子查询的范围内。我一直在搜索PostgreSQL文档，但似乎找不到原因。有人知道我的变量发生了什么吗？

语言SQL只接受位置参数：

CREATE OR REPLACE FUNCTION my_search(tsq tsquery, translation_id integer, lang text, count integer DEFAULT 10, skip integer DEFAULT 0)
RETURNS TABLE(id int, chapter int, number int, headline text) AS $$
      SELECT id, chapter, number, ts_headline($3, text, $1, 'StartSel = <em>, StopSel = </em>') FROM (
          SELECT (id, chapter, number, text) FROM my_texts
          WHERE $1 @@ search_text AND translation_id = $2
          LIMIT $4 OFFSET $5) AS matches;
$$ LANGUAGE SQL STABLE;

从：

SQL函数的参数在函数体中使用语法$n引用：$1引用第一个参数，$2引用第二个参数，依此类推。如果参数是复合类型，则可以使用点表示法（例如$1.name）访问参数的属性

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啊，就这样，谢谢你。对于那些可能对搜索存储过程感兴趣的人，我会用一个更有趣的标题更新这个问题：我会将标题还原回去，以便人们能够在Google上找到它。这更多地是关于位置参数，而不是全文搜索：

psql:scriptura.pgsql:7: ERROR:  column "tsq" does not exist
LINE 5:           WHERE tsq @@ search_text AND translation_id = tran...
                        ^

CREATE OR REPLACE FUNCTION my_search(tsq tsquery, translation_id integer, lang text, count integer DEFAULT 10, skip integer DEFAULT 0)
RETURNS TABLE(id int, chapter int, number int, headline text) AS $$
      SELECT id, chapter, number, ts_headline($3, text, $1, 'StartSel = <em>, StopSel = </em>') FROM (
          SELECT (id, chapter, number, text) FROM my_texts
          WHERE $1 @@ search_text AND translation_id = $2
          LIMIT $4 OFFSET $5) AS matches;
$$ LANGUAGE SQL STABLE;