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SQL> CREATE OR REPLACE PACKAGE Random AS
2
3 PROCEDURE ChangeSeed(p_NewSeed IN NUMBER);
4
5 FUNCTION Rand RETURN NUMBER;
6
7 PROCEDURE GetRand(p_RandomNumber OUT NUMBER);
8
9 FUNCTION RandMax(p_MaxVal IN NUMBER) RETURN NUMBER;
10
11 PROCEDURE GetRandMax(p_RandomNumber OUT NUMBER,p_MaxVal IN NUMBER);
12 END Random;
13 /
Package created.
SQL>
SQL> CREATE OR REPLACE PACKAGE BODY Random AS
2
3 v_Multiplier CONSTANT NUMBER := 2;
4 v_Increment CONSTANT NUMBER := 1;
5
6 v_Seed number := 1;
7
8 PROCEDURE ChangeSeed(p_NewSeed IN NUMBER) IS
9 BEGIN
10 v_Seed := p_NewSeed;
11 END ChangeSeed;
12
13 FUNCTION Rand RETURN NUMBER IS
14 BEGIN
15 v_Seed := MOD(v_Multiplier * v_Seed + v_Increment,(2 ** 32));
16 RETURN BITAND(v_Seed/(2 ** 16), 32767);
17 END Rand;
18
19 PROCEDURE GetRand(p_RandomNumber OUT NUMBER) IS
20 BEGIN
21 p_RandomNumber := Rand;
22 END GetRand;
23
24 FUNCTION RandMax(p_MaxVal IN NUMBER) RETURN NUMBER IS
25 BEGIN
26 RETURN MOD(Rand, p_MaxVal) + 1;
27 END RandMax;
28
29 PROCEDURE GetRandMax(p_RandomNumber OUT NUMBER,p_MaxVal IN NUMBER) IS
30 BEGIN
31 -- Simply call RandMax and return the value.
32 p_RandomNumber := RandMax(p_MaxVal);
33 END GetRandMax;
34
35 BEGIN
36 ChangeSeed(TO_NUMBER(TO_CHAR(SYSDATE, 'SSSSS')));
37 END Random;
38 /
Package body created.
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