Yurttas/PL/DBL/oracle/F/03/Company-B/q17.pc
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1/*
2REM
3REM q17.pc
4REM
5REM Delete all tuples in the works relation for employees
6REM of 'Small Bank Corporation'.
7REM
8*/
9
10#include <stdio.h>
11#include <sqlca.h>
12
13#define UNAME_LEN 32
14#define PWD_LEN 16
15
16VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
17VARCHAR password[PWD_LEN]; /* varchar can be in lower case also. */
18
19char u_name[UNAME_LEN];
20char pwd[PWD_LEN];
21
22struct {
23 char employeename[16];
24 char companyname[24];
25 int salary;
26} works;
27
28void connect_to_oracle();
29void sql_error();
30
31void main(int argc, char* argv[]) {
32 connect_to_oracle();
33
34 EXEC SQL
35 DELETE FROM Works
36 WHERE companyname = 'Small Bank Corporation';
37
38 EXEC SQL DECLARE c CURSOR FOR
39 SELECT *
40 FROM Works;
41
42 EXEC SQL OPEN c;
43
44 EXEC SQL WHENEVER NOT FOUND DO BREAK;
45
46 printf("\nemployeename\tcompanyname\tsalary\n");
47 for(;;) {
48 EXEC SQL FETCH c INTO :works;
49 printf("%s\t%s\t%d\n", works.employeename,
50 works.companyname,
51 works.salary);
52 }
53
54 EXEC SQL CLOSE c;
55
56 EXEC SQL COMMIT WORK RELEASE;
57
58 exit(0);
59}
60
61
62void sql_error(char* msg) {
63 char err_msg[128];
64 int buflen, msglen;
65
66 EXEC SQL WHENEVER SQLERROR CONTINUE;
67
68 printf("%s \n", msg);
69 buflen = sizeof(err_msg);
70 sqlglm(err_msg, &buflen, &msglen);
71 printf("%.*s \n", msglen, err_msg);
72 exit(1);
73}
74
75
76void connect_to_oracle() {
77 /* get your username/passwd from "user_pwd.txt" file */
78
79 FILE *in_file;
80 in_file = fopen("user_pwd.txt", "r");
81 fscanf(in_file, "%s", u_name);
82 fscanf(in_file, "%s", pwd);
83
84 strncpy((char *) username.arr, u_name, UNAME_LEN);
85 username.len = strlen((char *) username.arr);
86
87 strncpy((char *) password.arr, pwd, PWD_LEN);
88 password.len = strlen((char *) password.arr);
89
90 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
91 EXEC SQL CONNECT :username IDENTIFIED BY :password;
92
93 printf("connected to oracle - \n");
94}