pl/sql函数和程序

Question

We need to INSERT or UPDATE data of table consultant_skill , create needed functions, procedures … that accepts consultant id, skill id, and certification status for the task. The procedure should be user friendly enough to handle all possible errors such as consultant id, skill id do not exist OR certification status is different than 'Y', 'N'. Make sure to display: Consultant last, first name, skill description and the confirmation of the DML performed (hint: Do not forget to add COMMIT inside the procedure)

CREATE OR replace PROCEDURE nw (p_c_id          NUMBER, 
                                p_s_id          NUMBER, 
                                p_certification VARCHAR2) 
AS 
  v_c_id          NUMBER := p_c_id; 
  v_s_id          NUMBER := p_s_id; 
  v_certification VARCHAR2(20); 
  flag            NUMBER(3); 
BEGIN 
  SELECT count(*) 
  INTO   flag 
  FROM   consultant_skill 
  WHERE  c_id = v_c_id 
  AND    skill_id = v_s_id; 

  dbms_output.Put_line (flag); 
  IF flag > 0 THEN 
    UPDATE consultant_skill 
    SET    skill_id = p_s_id, 
           certification = p_certification 
    WHERE  c_id = v_c_id; 

  ELSE 
    dbms_output.Put_line ('bye bye'); 
  END IF; 
END; 
/ 

Stuck on update itself.. yet to try insert in else block.. first trying on update part.. dnt know if it is write or not

But on compiling the samd it is showing ora 00001: unique constraint violated

Answer 1

There is a unique key constraint on a combination of columns in the table. The update causes more than 1 record in the table to have the same values for this combination of columns. Make sure to ensure the uniqueness of the combination of columns, not only when inserting rows, but also when updating existing rows...