Oracle 自定义函数Function

CREATE OR REPLACE  FUNCTION "MY_DATABASE"."F_GET_USER_COUNT_BY_DEPART"
(
DEPART_ID_VAL in long
)
return varchar2
is
USER_STATE varchar(16);
USER_COUNT number;
begin
select count(*) into USER_COUNT from TB_USER_INFO where DEPART_ID=DEPART_ID_VAL;

if USER_COUNT > 0 then
USER_STATE:='该部门下有用户';
else
USER_STATE:='该部门下无用户';
end if;

return (USER_STATE);
end;

CREATE OR REPLACE  FUNCTION "数据库名称"."函数名"
(
参数一 [in,out] 类型,
参数二 [in,out] 类型,
...
)
return 返回值类型
is
变量一 类型;
变量二 类型;
... ;
begin
/*给变量赋值的过程*/

return (变量一或变量二或...);
end;