postgresql Postgres 从动态 sql 字符串创建本地临时表（提交删除时）

Postgres creating a local temp table (on commit drop) from a dynamic sql string

提问by Hassan Syed

I have a query string generated in a postgres UDF, i'd like to put it's result in a temp table to perform joins against (I'm using LIMITand OFFSET, and I don't want to join against other ttables only to end up choping the data off at the end --i.e., the LIMIT operator in the query plan). I attempt to create the temp table with the following statement.

我有一个在 postgres UDF 中生成的查询字符串，我想把它的结果放在一个临时表中来执行连接（我正在使用LIMITand OFFSET，我不想加入其他 ttables 只是为了最终切碎最后关闭数据——即查询计划中的 LIMIT 运算符）。我尝试使用以下语句创建临时表。

CREATE LOCAL TEMP TABLE query_result ON COMMIT DROP AS EXECUTE query_string_;

But I get the following error notice :

但我收到以下错误通知：

********** Error **********

ERROR: prepared statement "query_string_" does not exist
SQL state: 26000
Context: SQL statement "CREATE LOCAL TEMP TABLE query_result ON COMMIT DROP AS EXECUTE query_string_"
PL/pgSQL function "search_posts_unjoined" line 48 at SQL statement

Additionally, I tried preparing the statemen, but I couldn't get the syntax right either.

此外，我尝试准备 statemen，但我也无法正确使用语法。

The UDF in question is :

有问题的UDF是：

CREATE OR REPLACE FUNCTION search_posts_unjoined(
    forum_id_ INTEGER,
    query_    CHARACTER VARYING,
    offset_ INTEGER DEFAULT NULL,
    limit_ INTEGER DEFAULT NULL,
    from_date_ TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
    to_date_ TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
    in_categories_ INTEGER[] DEFAULT '{}'
    )
RETURNS SETOF forum_posts AS $$
DECLARE
    join_string CHARACTER VARYING := ' ';
    from_where_date CHARACTER VARYING := ' ';
    to_where_date CHARACTER VARYING := ' ';
    query_string_ CHARACTER VARYING := ' ';
    offset_str_ CHARACTER VARYING := ' ';
    limit_str_ CHARACTER VARYING := ' ';
BEGIN
    IF NOT from_date_ IS NULL THEN
        from_where_date := ' AND fp.posted_at > ''' || from_date_ || '''';
    END IF;

    IF NOT to_date_ IS NULL THEN
        to_where_date := ' AND fp.posted_at < ''' || to_date_ || '''';
    END IF;

    IF NOT offset_ IS NULL THEN
        offset_str_ := ' OFFSET ' || offset_; 
    END IF;

    IF NOT limit_ IS NULL THEN
        limit_str_ := ' LIMIT ' || limit_;
    END IF;

    IF NOT limit_ IS NULL THEN
    END IF;

    CREATE LOCAL TEMP TABLE un_cat(id) ON COMMIT DROP AS (select * from unnest(in_categories_)) ;

    if in_categories_ != '{}' THEN
        join_string := ' INNER JOIN un_cat uc ON uc.id = fp.category_id ' ;
    END IF;

    query_string_ := '
    SELECT fp.*
    FROM forum_posts fp' ||
        join_string
    ||
    'WHERE fp.forum_id = ' || forum_id_ || ' AND
    to_tsvector(''english'',fp.post_text) @@ to_tsquery(''english'','''|| query_||''')' || 
        from_where_date || 
        to_where_date ||
        offset_str_ ||
        limit_str_ 
    ||  ';';

    CREATE LOCAL TEMP TABLE query_result ON COMMIT DROP AS EXECUTE query_string_;

    RAISE NOTICE '%', query_string_;

    RETURN QUERY
    EXECUTE query_string_;
END;
$$ LANGUAGE plpgsql;

And it works when the statement in question is removed.

当有问题的语句被删除时它会起作用。

回答by Erwin Brandstetter

Use instead:

改用：

EXECUTE '
CREATE TEMP TABLE query_result ON COMMIT DROP AS '|| query_string_;

• EXECUTEthe whole statement.
  The syntax form CREATE TABLE foo AS EXECUTE <query>isn't valid.

• LOCALis just a noise word and ignored in this context.

• EXECUTE整个声明。
  语法形式CREATE TABLE foo AS EXECUTE <query>无效。

• LOCAL只是一个干扰词，在这种情况下被忽略。

More details in the manual.

手册中有更多详细信息。