Oracle DB 出现奇怪的错误

Question

我有下一个存储过程：

create or replace procedure generate_tables_for_project
as
begin
execute immediate 'create table farmers (email nvarchar2(30) PRIMARY KEY, fname nvarchar2(30), lname nvarchar2(30), password nvarchar2(30),  farmname nvarchar2(30), region nvarchar2(30), address nvarchar2(30) )';
execute immediate 'create table ISRAELLOCATIONS (region nvarchar2(30), regionID number(2) PRIMARY KEY )';
execute immediate 'create table product (name nvarchar2(30), productID number(2) PRIMARY KEY )';
execute immediate 'create table sub_product (name nvarchar2(30), sub_productID number(3) PRIMARY KEY , product_id number(2) REFERENCES product( productID))'; EXCEPTION
WHEN OTHERS THEN IF SQLCODE = -955
THEN
raise_application_error(-20001, 'Tables Exist!!!');--DBMS_OUTPUT.PUT_LINE( 'Data already exist!!!');
END IF;
end  generate_tables_for_project;

现在，当我在 SQLdeveloper 中激活该过程时，它就可以创建表了。 但是我再次激活我想只得到-955表存在错误。 但我也得到了错误：

ORA-20001: Tables Exist!!!
ORA-06512: at "HR.GENERATE_TABLES_FOR_PROJECT", line 11
ORA-06512: at line 2

ORA-20001 错误是我为 0955 引发的错误，所以这很好， 但是另外两个是什么？！

谢谢！

Answer 1

另外两个错误是因为HR.GENERATE_TABLES_FOR_PROJECT 过程中有错误，错误在第 2 行。

Answer 2

它显示错误堆栈，并不意味着您有更多错误；例如：

    SQL> CREATE OR REPLACE PROCEDURE test_error IS
  2  BEGIN
  3      raise_application_error(-20001, 'Error 1');
  4  EXCEPTION
  5      WHEN OTHERS THEN
  6          raise_application_error(-20002, 'Error 2');
  7  END;
  8  /

Procedure created.

SQL> exec test_error
BEGIN test_error; END;

*
ERROR at line 1:  
ORA-20002: Error 2
ORA-06512: at "SIUCONTAB.TEST_ERROR", line 6
ORA-06512: at line 1