如何正确调用其中包含动态SQL的PL / SQL函数？

Question

我写了一个PL / SQL函数：-

CREATE OR REPLACE FUNCTION register_driver1(driver_name IN VARCHAR, pass_word IN VARCHAR) RETURN NUMBER AS
sql_stmt VARCHAR2(200);
driver_id NUMBER;
new_view_name VARCHAR(50);
BEGIN

    sql_stmt := 'CREATE USER '||driver_name||' identified by '||pass_word;

    EXECUTE IMMEDIATE sql_stmt;

    sql_stmt := 'grant create session to '||driver_name;

    EXECUTE IMMEDIATE sql_stmt;

    driver_id := driver_ids.nextval;
    new_view_name := 'vehicle_'||driver_name;

    sql_stmt := 'CREATE VIEW '||new_view_name|| ' AS SELECT Model, Seats, reg_no FROM Vehicle WHERE(d_id='||driver_id||')';

    EXECUTE IMMEDIATE sql_stmt;

    sql_stmt := 'CREATE OR REPLACE TRIGGER reg_vehicle 
                 INSTEAD OF INSERT ON '||new_view_name||
               ' FOR EACH ROW 
                 DECLARE 
                 vehicle_id NUMBER;
                 BEGIN
                 vehicle_id := vehicle_ids.nextval
                 INSERT INTO Vehicles VALUES(:NEW.Model, :NEW.Seats, :NEW.reg_no, vehicle_id, '||driver_id||');
                 END;';

    EXECUTE IMMEDIATE sql_stmt;

    sql_stmt := 'grant insert, update, select, delete on '||new_view_name||' to '||driver_name;  

    EXECUTE IMMEDIATE sql_stmt;

    sql_stmt := 'grant select on PENDING_REQUESTS to '||driver_name;

    EXECUTE IMMEDIATE sql_stmt;

    RETURN driver_id;

END register_driver1;
/

但是，我不知道如何称呼它？在选择查询中调用不起作用，因为该函数具有DML和DDL语句。

使用以下电话：-

BEGIN
  register_driver1('RoCK', 'wt893fdg$');
END;
/

显示以下错误：-

Function REGISTER_DRIVER1 compiled

Elapsed: 00:00:00.009

ORA-06550: line 2, column 3: PLS-00221: 'REGISTER_DRIVER1' is not a procedure or is undefined ORA-06550: line 2, column 3: PL/SQL: Statement ignored

调用和函数均与ADMIN在同一工作表中执行。但是，它表明该过程未定义。请帮忙。使用Oracle Cloud的SQL Developer Web。

Answer 1

您的函数返回一个数字。在pl / sql块中调用它，在其中将函数分配给数字类型的变量。下面的示例是一个匿名的pl / sql块，但您也可以将其放在函数过程中。

DECLARE
  l_driver_id NUMBER;
BEGIN
  l_driver_id := register_driver1('RoCK', 'wt893fdg$');
  -- rest of code ... --
END;