Yurttas/PL/DBL/oracle/F/03/PC/q09.pc
Revision as of 00:03, 5 November 2013 by MassBot1 (talk | contribs) (Created page with "<syntaxhighlight lang="text" line start="1" enclose="div">→REM REM q09.pc REM REM Find the maker of the color printer with the lowest price. REM: #include <stdio.h> #in...")
1/*
2REM
3REM q09.pc
4REM
5REM Find the maker of the color printer with the lowest price.
6REM
7*/
8
9#include <stdio.h>
10#include <sqlca.h>
11
12#define UNAME_LEN 32
13#define PWD_LEN 16
14
15VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
16VARCHAR password[PWD_LEN]; /* varchar can be in lower case also. */
17
18char u_name[UNAME_LEN];
19char pwd[PWD_LEN];
20
21struct {
22 char maker[6];
23 int price;
24} makerprice;
25
26void connect_to_oracle();
27void sql_error();
28
29void main(int argc, char* argv[]) {
30 connect_to_oracle();
31
32 EXEC SQL DECLARE c CURSOR FOR
33 SELECT P.maker, R.price
34 FROM Product P, Printer R
35 WHERE P.model=R.model
36 AND R.price IN (SELECT MIN(price)
37 FROM Printer
38 WHERE color='true');
39
40 EXEC SQL OPEN c;
41
42 EXEC SQL WHENEVER NOT FOUND DO BREAK;
43
44 printf("\nmaker\tprice\n");
45 for(;;) {
46 EXEC SQL FETCH c INTO :makerprice;
47 printf("%s\t%d\n", makerprice.maker,
48 makerprice.price);
49 }
50
51 EXEC SQL CLOSE c;
52
53 EXEC SQL COMMIT WORK RELEASE;
54
55 exit(0);
56}
57
58
59void sql_error(char* msg) {
60 char err_msg[128];
61 int buflen, msglen;
62
63 EXEC SQL WHENEVER SQLERROR CONTINUE;
64
65 printf("%s \n", msg);
66 buflen = sizeof(err_msg);
67 sqlglm(err_msg, &buflen, &msglen);
68 printf("%.*s \n", msglen, err_msg);
69 exit(1);
70}
71
72
73void connect_to_oracle() {
74 /* get your username/passwd from "user_pwd.txt" file */
75
76 FILE *in_file;
77 in_file = fopen("user_pwd.txt", "r");
78 fscanf(in_file, "%s", u_name);
79 fscanf(in_file, "%s", pwd);
80
81 strncpy((char *) username.arr, u_name, UNAME_LEN);
82 username.len = strlen((char *) username.arr);
83
84 strncpy((char *) password.arr, pwd, PWD_LEN);
85 password.len = strlen((char *) password.arr);
86
87 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
88 EXEC SQL CONNECT :username IDENTIFIED BY :password;
89
90 printf("connected to oracle - \n");
91}