Yurttas/PL/DBL/oracle/F/03/Bank/a02.pc
Revision as of 23:34, 4 November 2013 by MassBot1 (talk | contribs) (Created page with "<syntaxhighlight lang="text" line start="1" enclose="div">ββREM REM a02.pc REM REM Find the number of depositors for each branch. REM: #include <stdio.h> #include <sqlca...")
1/*
2REM
3REM a02.pc
4REM
5REM Find the number of depositors for each branch.
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 branchname[16];
23 char customername[16];
24} depositor;
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 branchname, COUNT(DISTINCT customername)
34 FROM Depositor
35 GROUP BY branchname;
36
37 EXEC SQL OPEN c;
38
39 EXEC SQL WHENEVER NOT FOUND DO BREAK;
40
41 printf("\nbranchname\tcustomername\n");
42 for(;;) {
43 EXEC SQL FETCH c INTO :depositor;
44 printf("%s\t%s\n", depositor.branchname,
45 depositor.customername);
46 }
47
48 EXEC SQL CLOSE c;
49
50 EXEC SQL COMMIT WORK RELEASE;
51
52 exit(0);
53}
54
55
56void sql_error(char* msg) {
57 char err_msg[128];
58 int buflen, msglen;
59
60 EXEC SQL WHENEVER SQLERROR CONTINUE;
61
62 printf("%s \n", msg);
63 buflen = sizeof(err_msg);
64 sqlglm(err_msg, &buflen, &msglen);
65 printf("%.*s \n", msglen, err_msg);
66 exit(1);
67}
68
69
70void connect_to_oracle() {
71 /* get your username/passwd from "user_pwd.txt" file */
72
73 FILE *in_file;
74 in_file = fopen("user_pwd.txt", "r");
75 fscanf(in_file, "%s", u_name);
76 fscanf(in_file, "%s", pwd);
77
78 strncpy((char *) username.arr, u_name, UNAME_LEN);
79 username.len = strlen((char *) username.arr);
80
81 strncpy((char *) password.arr, pwd, PWD_LEN);
82 password.len = strlen((char *) password.arr);
83
84 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
85 EXEC SQL CONNECT :username IDENTIFIED BY :password;
86
87 printf("connected to oracle - \n");
88}