http://tech.163.com/05/0701/10/1NIODMQS00091589.html
Because there is no array in PL/SQL. This is an example from a random search and an example written by myself to explain how to use arrays in PL/SQL. Maybe many people already know it, but just let those who don't know understand it. Bar.
---------------------- Single-dimensional array -----------------------DECLARE
TYPE emp_ssn_array IS TABLE OF NUMBER
INDEX BY BINARY_INTEGER;
best_employees emp_ssn_array;
worst_employees emp_ssn_array;
BEGIN
best_employees(1) := '123456';
best_employees(2) := '888888';
worst_employees(1) := '222222';
worst_employees(2) := '666666';
FOR i IN 1..best_employees.count LOOP
DBMS_OUTPUT.PUT_LINE('i='|| i || ', best_employees= ' ||best_employees(i)
|| ', worst_employees= ' ||worst_employees(i));
END LOOP;
END;
---------------------- Multidimensional arrays ------------------------DECLARE
TYPE emp_type IS RECORD
( emp_id employee_table.emp_id%TYPE,
emp_name employee_table.emp_name%TYPE,
emp_gender employee_table.emp_gender%TYPE );
TYPE emp_type_array IS TABLE OF
emp_type INDEX BY BINARY_INTEGER;
emp_rec_array emp_type_array;
emp_rec emp_type;
BEGIN
emp_rec.emp_id := 300000000;
emp_rec.emp_name := 'Barbara';
emp_rec.emp_gender := 'Female';
emp_rec_array(1) := emp_rec;
emp_rec.emp_id := 300000008;
emp_rec.emp_name := 'Rick';
emp_rec.emp_gender := 'Male';
emp_rec_array(2) := emp_rec;
FOR i IN 1..emp_rec_array.count LOOP
DBMS_OUTPUT.PUT_LINE('i='||i
||', emp_id ='||emp_rec_array(i).emp_id
||', emp_name ='||emp_rec_array(i).emp_name
||', emp_gender = '||emp_rec_array(i).emp_gender);
END LOOP;
END;
-------------- Result --------------
i=1, emp_id =300000000, emp_name =Barbara, emp_gender = Female
i=2, emp_id =300000008, emp_name =Rick, emp_gender = Male
Note : There is no concept of array (Array) in PL/SQL. But if programmers want to use Array, they have to work around and use TYPE and Table of Record instead of multi-dimensional arrays, which are equally useful.
emp_type is like a record in a table, which contains id, name, gender and so on. emp_type_array is like a table, which contains a record (emp_type), just like a multidimensional array.
Reprinted in: https://www.cnblogs.com/alterhu/archive/2012/03/22/2411814.html