Oracle PL/SQL/Cursor/Cursor ISOPEN
Cursor isopen property
<source lang="sql">
SQL> SQL> SQL> -- create demo table SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 /
Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ("01","Jason", "Martin", to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto", "Programmer")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("02","Alison", "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("03","James", "Smith", to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("04","Celia", "Rice", to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("05","Robert", "Black", to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("06","Linda", "Green", to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York", "Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("07","David", "Larry", to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York", "Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("08","James", "Cat", to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
3 /
1 row created. SQL> SQL> SQL> SQL> -- display data in the table SQL> select * from Employee
2 /
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected. SQL> SQL> SQL> SQL> SQL> SQL> declare
2 cursor myCursor is select * from employee where rownum < 6 order by 1;
3
4 myEmployee employee%rowtype;
5 row number := 1;
6 begin
7 open myCursor;
8 fetch myCursor into myEmployee;
9
10 loop
11 if myCursor%FOUND then
12 dbms_output.put_line("Looping over record " ||row|| " of " || myCursor%ROWCOUNT);
13 fetch myCursor into myEmployee;
14 row := row + 1;
15 elsif myCursor%NOTFOUND then
16 exit;
17 end if;
18 end loop;
19
20 if myCursor%ISOPEN then
21 close myCursor;
22 end if;
23 end;
24 /
Looping over record 1 of 1 Looping over record 2 of 2 Looping over record 3 of 3 Looping over record 4 of 4 Looping over record 5 of 5 PL/SQL procedure successfully completed. SQL> SQL> -- clean the table SQL> drop table Employee
2 /
Table dropped. SQL> SQL>
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Explicit Attribute
<source lang="sql">
SQL> CREATE TABLE emp (
2 id NUMBER PRIMARY KEY, 3 fname VARCHAR2(50), 4 lname VARCHAR2(50) 5 );
Table created. SQL> SQL> INSERT INTO emp (id, fname, lname)VALUES (1, "A", "B"); 1 row created. SQL> INSERT INTO emp (id, fname, lname)VALUES (2, "C", "D"); 1 row created. SQL> INSERT INTO emp (id, fname, lname)VALUES (3, "Enn", "F"); 1 row created. SQL> INSERT INTO emp (id, fname, lname)VALUES (4, "G", "H"); 1 row created. SQL> INSERT INTO emp (id, fname, lname)VALUES (5, "G", "Z"); 1 row created. SQL> SQL> SQL> CREATE TABLE book (
2 isbn CHAR(10) PRIMARY KEY, 3 category VARCHAR2(20), 4 title VARCHAR2(100), 5 num_pages NUMBER, 6 price NUMBER, 7 copyright NUMBER(4), 8 emp1 NUMBER, 9 emp2 NUMBER, 10 emp3 NUMBER 11 );
Table created. SQL> SQL> INSERT INTO book (isbn, category, title, num_pages, price, copyright, emp1, emp2, emp3)
2 VALUES ("1", "Database", "Oracle", 563, 39.99, 2009, 1, 2, 3);
1 row created. SQL> INSERT INTO book (isbn, category, title, num_pages, price, copyright, emp1, emp2)
2 VALUES ("2", "Database", "MySQL", 765, 44.99, 2009, 4, 5);
1 row created. SQL> INSERT INTO book (isbn, category, title, num_pages, price, copyright, emp1, emp2, emp3)
2 VALUES ("3", "Database", "SQL Server", 404, 39.99, 2001, 6, 7, 8);
1 row created. SQL> SQL> SET SERVEROUTPUT ON ESCAPE OFF SQL> SQL> DECLARE
2
3 fnameValue emp.fname%TYPE;
4 lnameValue emp.lname%TYPE;
5 v_row_count PLS_INTEGER := 0;
6 v_book_count PLS_INTEGER := 0;
7
8 CURSOR auth_cur IS
9 SELECT a.fname, a.lname, count(b.title)
10 FROM emp a, book b
11 GROUP BY a.fname, a.lname
12 HAVING count(b.title) > 0
13 ORDER BY a.lname;
14
15 BEGIN
16 DBMS_OUTPUT.ENABLE(1000000);
17 OPEN auth_cur;
18 LOOP
19 FETCH auth_cur INTO fnameValue, lnameValue, v_book_count;
20 EXIT WHEN auth_cur%NOTFOUND;
21
22
23 v_row_count := auth_cur%ROWCOUNT;
24 DBMS_OUTPUT.PUT_LINE(v_row_count||" rows processed so far");
25
26 DBMS_OUTPUT.PUT_LINE(lnameValue||","||fnameValue||" wrote "||v_book_count||" book(s).");
27 END LOOP;
28 CLOSE auth_cur;
29 IF auth_cur%ISOPEN = FALSE
30 THEN
31 DBMS_OUTPUT.PUT_LINE("Cursor closed");
32 ELSE
33 DBMS_OUTPUT.PUT_LINE("The cursor is still open");
34 END IF;
35
36 EXCEPTION
37 WHEN OTHERS
38 THEN
39 DBMS_OUTPUT.PUT_LINE(SQLERRM);
40 END;
41 /
1 rows processed so far B,A wrote 3 book(s). 2 rows processed so far D,C wrote 3 book(s). 3 rows processed so far F,Enn wrote 3 book(s). 4 rows processed so far H,G wrote 3 book(s). 5 rows processed so far Z,G wrote 3 book(s). Cursor closed PL/SQL procedure successfully completed. SQL> drop table emp; Table dropped. SQL> drop table book; Table dropped. SQL>
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