Below is a function that demonstrates how to use the FETCH statement
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 Employee's Fi LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---- ------------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 $1,234.56 Toronto Programmer
02 Alison Mathews 21-MAR-76 21-FEB-86 $6,661.78 Vancouver Tester
03 James Smith 12-DEC-78 15-MAR-90 $6,544.78 Vancouver Tester
04 Celia Rice 24-OCT-82 21-APR-99 $2,344.78 Vancouver Manager
05 Robert Black 15-JAN-84 08-AUG-98 $2,334.78 Vancouver Tester
06 Linda Green 30-JUL-87 04-JAN-96 $4,322.78 New York Tester
07 David Larry 31-DEC-90 12-FEB-98 $7,897.78 New York Manager
08 James Cat 17-SEP-96 15-APR-02 $1,232.78 Vancouver Tester
8 rows selected.
SQL>
SQL>
SQL> -- Cursor without parameters (simplest)
SQL> CREATE OR REPLACE Function FindEmployeeSalary ( name_in IN varchar2 ) RETURN number
2 IS
3 mySalary number;
4
5 CURSOR c1
6 IS
7 SELECT salary
8 from employee
9 where first_name = name_in;
10
11 BEGIN
12
13 open c1;
14 fetch c1 into mySalary;
15
16 if c1%notfound then
17 mySalary := 0;
18 end if;
19
20 close c1;
21
22 RETURN mySalary;
23
24 END;
25 /
Function created.
SQL>
SQL> select FindEmployeeSalary(first_name) from employee;
FINDEMPLOYEESALARY(FIRST_NAME)
------------------------------
1234.56
6661.78
6544.78
2344.78
2334.78
4322.78
7897.78
6544.78
8 rows selected.
SQL>
SQL> -- clean the table
SQL> drop table Employee
2 /
Table dropped.
SQL>
SQL>
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