如何调用函数，PostgreSQL

我正在try 使用PostgreSQL函数来保存一些数据.以下是创建脚本:

-- Function: "saveUser"(integer, character varying, character varying, character varying, character varying, character varying)

-- DROP FUNCTION "saveUser"(integer, character varying, character varying, character varying, character varying, character varying);

CREATE OR REPLACE FUNCTION "saveUser"("pUserID" integer, "pName" character
varying, "pLastName" character varying, "pUserName" character varying, 
"pPassword" character varying, "peMail" character varying)
RETURNS boolean AS
$BODY$
BEGIN
SELECT 1
FROM "USERS"
WHERE "userID" = $1;

IF FOUND THEN
UPDATE "USERS" 
    SET     "name" = $2,
    "lastName" = $3,
    "userName" = $4,
    "password" = $5,
    "eMail" = $6
WHERE "userID" = $1;
ELSE
    INSERT INTO "USERS"
    ("name", "lastName", "userName", "password", "eMail")
    VALUES
        ($2, $3, $4, $5, $6);
END IF;
END;$BODY$
  LANGUAGE 'plpgsql' VOLATILE
  COST 100;
ALTER FUNCTION "saveUser"(integer, character varying, character varying, character varying, character varying, character varying) OWNER TO postgres;

PostreSQL文档指出，要调用不返回任何resultset的函数，只写其名称和属性就足够了.所以我试着这样调用函数:

"saveUser"(3, 'asd','asd','asd','asd','asd');

但我得到的错误如下:

ERROR:  syntax error at or near ""saveUser""
LINE 1: "saveUser"(3, 'asd','asd','asd','asd','asd')
     ^

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

ERROR: syntax error at or near ""saveUser""
SQL state: 42601
Character: 1

我还有其他返回结果集的函数.我用SELECT * FROM "fnc"(...)给他们打电话，效果很好.为什么我会犯这个错误？

EDIT:我正在使用pgAdmin III查询工具，并试图在那里执行SQL语句.