Yurttas/PL/DBL/oracle/F/03/Movie/q09.pc

 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}