我正在尝试构建一个Postgres函数,它以表名作为变量参数并输出查询,返回来自information_schema的select字符串,如
SELECT *
FROM table1
UNION
SELECT *
FROM table2到目前为止,我做了以下几点:
CREATE OR REPLACE FUNCTION query_tables(VARIADIC list text[])
RETURNS text
AS $$
DECLARE
qry TEXT;
BEGIN
SELECT string_agg(
format('SELECT *
FROM %1$I', table_name),
' UNION ')
INTO qry
FROM information_schema.tables
WHERE table_schema = 'public'
AND table_name IN (list);
return qry;
END;
$$所以它可以被称为SELECT * FROM query_tables('table1','table2');
但是,我被困在IN (list)中,无法在IN()中传递这个可变参数。
有可能吗?
发布于 2018-01-11 14:25:20
若要使用数组,请更改
table_name IN (list)到table_name = ANY (list)
https://www.postgresql.org/docs/current/static/functions-comparisons.html
表达式运算符任意(数组表达式)
https://stackoverflow.com/questions/48209168
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