Yurttas/PL/DBL/oracle/F/03/SPJ/q14.pc
Jump to navigation
Jump to search
1/*
2REM
3REM q14.pc
4REM
5REM Construct a table containing a list of project numbers
6REM for projects that are either located in 'London' or are
7REM supplied by a 'London' supplier.
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 jn[4];
25} londonprojects;
26
27void connect_to_oracle();
28void sql_error();
29
30void main(int argc, char* argv[]) {
31 connect_to_oracle();
32
33 EXEC SQL
34 CREATE TABLE LondonProjects (JN VARCHAR2(4));
35
36 EXEC SQL
37 INSERT INTO LondonProjects
38 (SELECT T.JN
39 FROM Shipments T, Suppliers S
40 WHERE T.SN = S.SN
41 AND S.CITY = 'London')
42 UNION
43 (SELECT JN
44 FROM Projects
45 WHERE CITY = 'London');
46
47 EXEC SQL DECLARE c CURSOR FOR
48 SELECT *
49 FROM LondonProjects;
50
51 EXEC SQL OPEN c;
52
53 EXEC SQL WHENEVER NOT FOUND DO BREAK;
54
55 printf("\njn\n");
56 for(;;) {
57 EXEC SQL FETCH c INTO :londonprojects;
58 printf("%s\n", londonprojects.jn);
59 }
60
61 EXEC SQL CLOSE c;
62
63 EXEC SQL COMMIT WORK RELEASE;
64
65 exit(0);
66}
67
68
69void sql_error(char* msg) {
70 char err_msg[128];
71 int buflen, msglen;
72
73 EXEC SQL WHENEVER SQLERROR CONTINUE;
74
75 printf("%s \n", msg);
76 buflen = sizeof(err_msg);
77 sqlglm(err_msg, &buflen, &msglen);
78 printf("%.*s \n", msglen, err_msg);
79 exit(1);
80}
81
82
83void connect_to_oracle() {
84 /* get your username/passwd from "user_pwd.txt" file */
85
86 FILE *in_file;
87 in_file = fopen("user_pwd.txt", "r");
88 fscanf(in_file, "%s", u_name);
89 fscanf(in_file, "%s", pwd);
90
91 strncpy((char *) username.arr, u_name, UNAME_LEN);
92 username.len = strlen((char *) username.arr);
93
94 strncpy((char *) password.arr, pwd, PWD_LEN);
95 password.len = strlen((char *) password.arr);
96
97 EXEC SQL WHENEVER SQLERROR DO sql_error ("ORACLE error-- ");
98 EXEC SQL CONNECT :username IDENTIFIED BY :password;
99
100 printf("connected to oracle - \n");
101}