我的資料庫版本是 PostgreSQL 8.4.7 。 下面是出錯的儲存過程：

CREATE or Replace FUNCTION func_getnextid( tablename varchar(240), idname varchar(20) default 'id') RETURNS integer AS $funcbody$ Declare sqlstring varchar(240); currentId integer; Begin sqlstring:= 'select max("' || idname || '") into currentId from "' || tablename || '";'; EXECUTE sqlstring; if currentId is NULL or currentId = 0 then return 1; else return currentId + 1; end if; End; $funcbody$ LANGUAGE plpgsq

執行後出現這樣的錯誤：

SQL error:

ERROR:  EXECUTE of SELECT ... INTO is not implemented

CONTEXT:  PL/pgSQL function "func_getnextbigid" line 6 at EXECUTE statement

改成這樣的就對了：

CREATE or Replace FUNCTION func_getnextid( tablename varchar(240), idname varchar(20) default 'id') RETURNS integer AS $funcbody$ Declare sqlstring varchar(240); currentId integer; Begin sqlstring:= 'select max("' || idname || '") from "' || tablename || '";'; EXECUTE sqlstring into currentId; if currentId is NULL or currentId = 0 then return 1; else return currentId + 1; end if; End; $funcbody$ LANGUAGE plpgsql;