1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* Program type: Embedded Dynamic SQL
*
* Description:
* This program displays employee names and phone extensions.
*
* It allocates an output SQLDA, declares and opens a cursor,
* and loops fetching multiple rows.
* The contents of this file are subject to the Interbase Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy
* of the License at http://www.Inprise.com/IPL.html
*
* Software distributed under the License is distributed on an
* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
* or implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code was created by Inprise Corporation
* and its predecessors. Portions created by Inprise Corporation are
* Copyright (C) Inprise Corporation.
*
* All Rights Reserved.
* Contributor(s): ______________________________________.
*/
#include "example.h"
#include <stdlib.h>
#include <string.h>
void print_error (void);
char *sel_str =
"SELECT last_name, first_name, phone_ext FROM phone_list \
WHERE location = 'Monterey' ORDER BY last_name, first_name;";
/* This macro is used to declare structures representing SQL VARCHAR types */
#define SQL_VARCHAR(len) struct {short vary_length; char vary_string[(len)+1];}
char Db_name[128];
EXEC SQL
SET DATABASE empdb = "employee.fdb" RUNTIME :Db_name;
int main(int argc, char** argv)
{
SQL_VARCHAR(15) first_name;
SQL_VARCHAR(20) last_name;
char phone_ext[6];
XSQLDA *sqlda;
short flag0 = 0, flag1 = 0, flag2 = 0;
if (argc > 1)
strcpy(Db_name, argv[1]);
else
strcpy(Db_name, "employee.fdb");
EXEC SQL
WHENEVER SQLERROR GO TO Error;
EXEC SQL
CONNECT empdb;
EXEC SQL
SET TRANSACTION;
/* Allocate an output SQLDA. */
sqlda = (XSQLDA *) malloc(XSQLDA_LENGTH(3));
sqlda->sqln = 3;
sqlda->version = 1;
/* Prepare the query. */
EXEC SQL
PREPARE q INTO SQL DESCRIPTOR sqlda FROM :sel_str;
/*
* Although, all three selected columns are of type varchar, the
* third field's type is changed and printed as type TEXT.
*/
sqlda->sqlvar[0].sqldata = (char *)&last_name;
sqlda->sqlvar[0].sqltype = SQL_VARYING + 1;
sqlda->sqlvar[0].sqlind = &flag0;
sqlda->sqlvar[1].sqldata = (char *)&first_name;
sqlda->sqlvar[1].sqltype = SQL_VARYING + 1;
sqlda->sqlvar[1].sqlind = &flag1;
sqlda->sqlvar[2].sqldata = phone_ext;
sqlda->sqlvar[2].sqltype = SQL_TEXT + 1;
sqlda->sqlvar[2].sqlind = &flag2;
/* Declare the cursor for the prepared query. */
EXEC SQL
DECLARE s CURSOR FOR q;
EXEC SQL
OPEN s;
printf("\n%-20s %-15s %-10s\n\n", "LAST NAME", "FIRST NAME", "EXTENSION");
/*
* Fetch and print the records.
*/
while (SQLCODE == 0)
{
EXEC SQL
FETCH s USING SQL DESCRIPTOR sqlda;
if (SQLCODE == 100)
break;
printf("%-20.*s ", last_name.vary_length, last_name.vary_string);
printf("%-15.*s ", first_name.vary_length, first_name.vary_string);
phone_ext[sqlda->sqlvar[2].sqllen] = '\0';
printf("%-10s\n", phone_ext);
}
EXEC SQL
CLOSE s;
EXEC SQL
COMMIT;
EXEC SQL
DISCONNECT empdb;
free( sqlda);
return(0);
Error:
print_error();
}
void print_error (void)
{
isc_print_status(gds__status);
printf("SQLCODE=%d\n", SQLCODE);
}
|
