DB2 Stored Procedure Exception Handling Guide

1 year ago
Isabella Edwards
2 minutes

There are several ways to handle exceptions in DB2 stored procedures.

  1. Utilize exception handling statements: Use exception handling statements in stored procedures to capture and handle exceptions. Wrap the code block of the stored procedure with BEGIN ATOMIC and END ATOMIC, and use the EXCEPTION clause to capture and handle exceptions. For example:
BEGIN
  DECLARE CONTINUE HANDLER FOR SQLEXCEPTION 
  BEGIN
    -- 处理异常的代码
  END;
  
  -- 存储过程的代码块
END;
  1. Retrieve error code or error message: You can use the GET DIAGNOSTICS statement in a stored procedure to fetch exception information and then return the error code or error message to the caller. For example:
BEGIN
  DECLARE error_code INTEGER;
  DECLARE error_msg VARCHAR(255);
  
  -- 存储过程的代码块
  
  GET DIAGNOSTICS EXCEPTION 1 error_code = RETURNED_SQLCODE, error_msg = MESSAGE_TEXT;
  
  -- 返回错误码或错误信息给调用者
END;
  1. To ensure the integrity and consistency of the data, you can use transaction rollback after catching an exception. This allows the transaction to be rolled back to its previous state.
  2. Record abnormal logs: Exception information can be logged into a log file for future analysis and debugging. DB2’s logging feature or a custom log table can be used to record the exception information.

By using the above methods, it is possible to effectively handle exceptions in DB2 stored procedures, ensuring the stability and reliability of the system.

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