Yurttas/PL/DBL/oracle/F/03/Movie/q09.pc
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1/*
2REM
3REM q09.pc
4REM
5REM Delete all movie executives whose net
6REM worth is less than 25 million dollars.
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 name[18];
24 int address;
25 int cn;
26 int networth;
27} movieexec;
28
29void connect_to_oracle();
30void sql_error();
31
32void main(int argc, char* argv[]) {
33 connect_to_oracle();
34
35 EXEC SQL
36 DELETE FROM MovieExec
37 WHERE networth < 25;
38
39 EXEC SQL DECLARE c CURSOR FOR
40 SELECT *
41 FROM MovieExec;
42
43 EXEC SQL OPEN c;
44
45 EXEC SQL WHENEVER NOT FOUND DO BREAK;
46
47 printf("\nname\taddress\tcn\tnetworth\n");
48 for(;;) {
49 EXEC SQL FETCH c INTO :movieexec;
50 printf("%s\t%s\t%d\t%d\n", movieexec.name,
51 movieexec.address,
52 movieexec.cn,
53 }
54
55 EXEC SQL CLOSE c;
56
57 EXEC SQL COMMIT WORK RELEASE;
58
59 exit(0);
60}
61
62
63void sql_error(char* msg) {
64 char err_msg[128];
65 int buflen, msglen;
66
67 EXEC SQL WHENEVER SQLERROR CONTINUE;
68
69 printf("%s \n", msg);
70 buflen = sizeof(err_msg);
71 sqlglm(err_msg, &buflen, &msglen);
72 printf("%.*s \n", msglen, err_msg);
73 exit(1);
74}
75
76
77void connect_to_oracle() {
78 /* get your username/passwd from "user_pwd.txt" file */
79
80 FILE *in_file;
81 in_file = fopen("user_pwd.txt", "r");
82 fscanf(in_file, "%s", u_name);
83 fscanf(in_file, "%s", pwd);
84
85 strncpy((char *) username.arr, u_name, UNAME_LEN);
86 username.len = strlen((char *) username.arr);
87
88 strncpy((char *) password.arr, pwd, PWD_LEN);
89 password.len = strlen((char *) password.arr);
90
91 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
92 EXEC SQL CONNECT :username IDENTIFIED BY :password;
93
94 printf("connected to oracle - \n");
95}