DB2 cursor and usage

To learn how to use a DB2 database, DB2 cursors must be mastered. We will introduce the definition and usage of DB2 cursors in detail and give examples to help you understand them.

Define a cursor:
Declare cursor name CURSOR
Select statement;

Open cursor:
OPEN cursor name;

Valid value:
FETCH cursor name INTO Variable list

Example:

 
 

  
  
DECLARE c1 CURSOR FOR  
  
  
SELECT CAST(salary AS DOUBLE)  
  
  
FROM staff  
  
  
WHERE DEPT = deptNumber 
  
  
ORDER BY salary;  
  
  
DECLARE EXIT HANDLER FOR NOT FOUND  
  
  
SET medianSalary = 6666;  
  
  
SET medianSalary = 0;  
  
  
 
  
  
SELECT COUNT(*) INTO v_numRecords  
  
  
FROM staff  
  
  
WHERE DEPT = deptNumber;  
  
  
OPEN c1;  
  
  
WHILE v_counter < (v_numRecords / 2 + 1) DO  
  
  
FETCH c1 INTO medianSalary;  
  
  
SET v_counterv_counter = v_counter + 1;  
  
  
END WHILE;  
  
  
CLOSE c1;  
  
  
 
 
 

Note: If the cursor declaration is placed in the middle segment, use "begin... End; ". segment segmentation Mark split.
 

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