我的触发器有什么问题？甲骨文SQLPLUS

Question

SQLPLUS 触发器编译错误

我是 oracle sqlplus 的新手，我正在尝试创建一个触发器，当客户从他们的帐户存款或取款时触发，显示 account_no，交易类型（deposit/withdraw ), 交易金额, 旧余额和新余额:

这里是 table 的代码（我已经创建了）：

CREATE TABLE CUSTOMERS,
(
  custname VARCHAR2(20)NOT NULL,
  account_no NUMBER(20)NOT NULL,
  cur_balance NUMBER(20) NOT NULL,
  PRIMARY KEY (account_no)
 );

这是我编译的触发代码，但一直报错：

CREATE OR REPLACE TRIGGER account_tx   
AFTER INSERT OR UPDATE OF cur_balance ON customers  
FOR EACH ROW  
DECLARE   
   new_balance number;   
BEGIN CASE WHEN :NEW.cur_balance <:OLD.cur_balance THEN 'WITHDRAWAL';  
ELSE 'DEPOSIT';   
   new_balance := :NEW.cur_balance  - :OLD.cur_balance;   
   dbms_output.put_line('Old balance: ' || :OLD.cur_balance);   
   dbms_output.put_line('New balance: ' || :NEW.cur_balance);   
   dbms_output.put_line('Transaction Amount: ' || new_balance);  
END CASE;  
END;  
/

Answer 1

您的创建 table 无效，第一行额外逗号

当您遇到错误时，您可以使用 'show errors' 命令查看它们。

运行你的代码，我看到了：

SQL> show errors
Errors for TRIGGER ACCOUNT_TX:

LINE/COL ERROR
-------- -----------------------------------------------------------------
3/57     PLS-00103: Encountered the symbol "WITHDRAWAL" when expecting one
     of the following:
     ( begin case declare exit for goto if loop mod null pragma
     raise return select update while with <an identifier>
     <a double-quoted delimited-identifier> <a bind variable> <<
     continue close current delete fetch lock insert open rollback
     savepoint set sql execute commit forall merge pipe purge
     json_exists json_value json_query json_object json_array

SQL>

Answer 2

你的CASE语句是messed-up你需要把CASE语句的结果赋值给一个变量，像这样：

CREATE OR REPLACE TRIGGER account_tx
AFTER INSERT OR UPDATE OF cur_balance ON customers
FOR EACH ROW
DECLARE
new_balance number;
trans_type varchar2(30);
BEGIN 
trans_type := CASE WHEN :NEW.cur_balance <:OLD.cur_balance THEN 'WITHDRAWAL'ELSE 'DEPOSIT' END;
new_balance := :NEW.cur_balance  - :OLD.cur_balance;
dbms_output.put_line('Old balance: ' || :OLD.cur_balance);
dbms_output.put_line('New balance: ' || :NEW.cur_balance);
dbms_output.put_line('Transaction Amount: ' || new_balance);
dbms_output.put_line('trans type: ' || trans_type);

END;

我的触发器有什么问题？甲骨文SQLPLUS

What is wrong with my Trigger? Oracle SQLPLUS

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SQLPLUS 触发器编译错误