我如何编写一个包含动态构建 SQL 语句返回结果集的存储过程?这是我的示例代码:
CREATE OR REPLACE FUNCTION reporting.report_get_countries_new (
starts_with varchar,
ends_with varchar
)
RETURNS TABLE (
country_id integer,
country_name varchar
) AS
$body$
DECLARE
starts_with ALIAS FOR $1;
ends_with ALIAS FOR $2;
sql VARCHAR;
BEGIN
sql = 'SELECT * FROM lookups.countries WHERE lookups.countries.country_name >= ' || starts_with ;
IF ends_with IS NOT NULL THEN
sql = sql || ' AND lookups.countries.country_name <= ' || ends_with ;
END IF;
RETURN QUERY EXECUTE sql;
END;
$body$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100 ROWS 1000;
这段代码返回一个错误:
ERROR: syntax error at or near "RETURN"
LINE 1: RETURN QUERY SELECT * FROM omnipay_lookups.countries WHERE o...
^
QUERY: RETURN QUERY SELECT * FROM omnipay_lookups.countries WHERE omnipay_lookups.countries.country_name >= r
CONTEXT: PL/pgSQL function "report_get_countries_new" line 14 at EXECUTE statement
除了这种方式,我已经尝试过其他方法:
RETURN QUERY EXECUTE sql;
方法1:
RETURN EXECUTE sql;
第二种方法:
sql = 'RETURN QUERY SELECT * FROM....
/*later*/
EXECUTE sql;
所有尝试都没有成功。
最终我想编写一个包含动态SQL语句并返回该语句结果集的存储过程。