Yurttas/PL/DBL/oracle/F/03/Company-A/q01.pc

 1/*  
 2REM
 3REM q01.pc
 4REM
 5REM Retrieve the names of employees in department 5
 6REM who work more than 10 hours per week on the
 7REM 'ProductX' project.
 8REM
 9*/
10
11#include <stdio.h>
12#include <sqlca.h>
13
14#define UNAME_LEN 32
15#define PWD_LEN   16
16
17VARCHAR username[UNAME_LEN]; /* VARCHAR is an Oracle-supplied struct */
18VARCHAR password[PWD_LEN];   /* varchar can be in lower case also. */
19
20char u_name[UNAME_LEN];
21char pwd[PWD_LEN];
22
23struct {
24  char fname[12];
25  char minit;
26  char lname[16];
27} employee;
28
29void connect_to_oracle();
30void sql_error();
31
32void main(int argc, char* argv[]) {
33  connect_to_oracle();
34
35  EXEC SQL DECLARE c CURSOR FOR
36    SELECT DISTINCT fname, minit, lname
37    FROM Employee, Project, WorksOn
38    WHERE Employee.dno = Project.dnum
39      AND Employee.ssn = WorksOn.essn
40      AND Project.pnumber = WorksOn.pno
41      AND Employee.dno = 5
42      AND hours > 10
43      AND pname = 'ProductX';
44
45  EXEC SQL OPEN c;
46
47  EXEC SQL WHENEVER NOT FOUND DO BREAK;
48
49  printf("\nfname\tminit\tlname\n");
50  for(;;) {
51    EXEC SQL FETCH c INTO :employee;
52    printf("%s\t%s\t%s\n", employee.fname,
53                           employee.minit,
54                           employee.lname);
55  }
56
57  EXEC SQL CLOSE c;
58
59  EXEC SQL COMMIT WORK RELEASE;
60
61  exit(0);
62}
63
64
65void sql_error(char* msg) {
66  char err_msg[128];
67  int buflen, msglen;
68
69  EXEC SQL WHENEVER SQLERROR CONTINUE;
70
71  printf("%s \n", msg);
72  buflen = sizeof(err_msg);
73  sqlglm(err_msg, &buflen, &msglen);
74  printf("%.*s \n", msglen, err_msg);
75  exit(1);
76}
77
78
79void connect_to_oracle() {
80  /* get your username/passwd from "user_pwd.txt" file */
81
82  FILE *in_file;
83  in_file = fopen("user_pwd.txt", "r");
84  fscanf(in_file, "%s", u_name);
85  fscanf(in_file, "%s", pwd);
86
87  strncpy((char *) username.arr, u_name, UNAME_LEN);
88  username.len = strlen((char *) username.arr);
89
90  strncpy((char *) password.arr, pwd, PWD_LEN);
91  password.len = strlen((char *) password.arr);
92
93  EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
94  EXEC SQL CONNECT :username IDENTIFIED BY :password;
95
96  printf("connected to oracle - \n");
97}