Question

我试图在plpgsql函数中创建一个条件语句，它将仅通过if语句过滤掉我想要的记录。我现在正在测试，但这是我的表结构：

CREATE TABLE addresses
(
  gid serial NOT NULL,
  housenum character varying(30),
  prefix character varying(10),
  name character varying(100),
  type character varying(16)
)

这是我的功能：

CREATE OR REPLACE FUNCTION "geomCheck".getAllFoo() RETURNS SETOF 
addresses AS
    $BODY$
    DECLARE
        r addresses%rowtype;
    BEGIN
        FOR r IN SELECT * FROM addresses
        WHERE gid > 0
        LOOP
        if name = 'BRIE' then
         RETURN NEXT r;
        end if;
        END LOOP;
        RETURN;
    END
    $BODY$
    LANGUAGE 'plpgsql' ;

但是当我去调用该函数时，我得到了这个错误：

ERROR:  column "name" does not exist
LINE 1: SELECT name = 'BRIE'
               ^
QUERY:  SELECT name = 'BRIE'
CONTEXT:  PL/pgSQL function "geomCheck".getallfoo() line 8 at IF
********** Error **********

ERROR: column "name" does not exist
SQL state: 42703
Context: PL/pgSQL function "geomCheck".getallfoo() line 8 at IF

如何检查name = 'BRIE'声明中的if？

Answer 1

您需要在名称前添加r：

BEGIN
    FOR r IN SELECT * FROM addresses
    WHERE gid > 0
    LOOP
    if r.name = 'BRIE' then    -- instead of "name" => "r.name"
     RETURN NEXT r;
    end if;
    END LOOP;
    RETURN;
END

plpgsql函数用条件语句来访问列名

1 个答案: