Yurttas/PL/DBL/oracle/F/03/PC/q08.pc
Revision as of 00:03, 5 November 2013 by MassBot1 (talk | contribs) (Created page with "<syntaxhighlight lang="text" line start="1" enclose="div">ββREM REM q08.pc REM REM Find the printers with the highest price. REM: #include <stdio.h> #include <sqlca.h> ...")
1/*
2REM
3REM q08.pc
4REM
5REM Find the printers with the highest 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 model[6];
23} printer;
24
25void connect_to_oracle();
26void sql_error();
27
28void main(int argc, char* argv[]) {
29 connect_to_oracle();
30
31 EXEC SQL DECLARE c CURSOR FOR
32 SELECT model
33 FROM Printer
34 WHERE price = (SELECT MAX(price)
35 FROM Printer);
36
37 EXEC SQL OPEN c;
38
39 EXEC SQL WHENEVER NOT FOUND DO BREAK;
40
41 printf("\nmodel\n");
42 for(;;) {
43 EXEC SQL FETCH c INTO :printer;
44 printf("%s\n", printer.model);
45 }
46
47 EXEC SQL CLOSE c;
48
49 EXEC SQL COMMIT WORK RELEASE;
50
51 exit(0);
52}
53
54
55void sql_error(char* msg) {
56 char err_msg[128];
57 int buflen, msglen;
58
59 EXEC SQL WHENEVER SQLERROR CONTINUE;
60
61 printf("%s \n", msg);
62 buflen = sizeof(err_msg);
63 sqlglm(err_msg, &buflen, &msglen);
64 printf("%.*s \n", msglen, err_msg);
65 exit(1);
66}
67
68
69void connect_to_oracle() {
70 /* get your username/passwd from "user_pwd.txt" file */
71
72 FILE *in_file;
73 in_file = fopen("user_pwd.txt", "r");
74 fscanf(in_file, "%s", u_name);
75 fscanf(in_file, "%s", pwd);
76
77 strncpy((char *) username.arr, u_name, UNAME_LEN);
78 username.len = strlen((char *) username.arr);
79
80 strncpy((char *) password.arr, pwd, PWD_LEN);
81 password.len = strlen((char *) password.arr);
82
83 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
84 EXEC SQL CONNECT :username IDENTIFIED BY :password;
85
86 printf("connected to oracle - \n");
87}