summaryrefslogtreecommitdiffabout
path: root/src/pgsql.c
blob: c5cf51e50f3ac096d835a67250c61b92d2d1c14a (plain)
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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
/* This file is part of Gamma.
   Copyright (C) 2002, 2010 Sergey Poznyakoff

   Gamma is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   Gamma is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Gamma.  If not, see <http://www.gnu.org/licenses/>. */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <guile-sql.h>
#include <libpq-fe.h>

static SCM
s_pgsql_mark(struct sql_connect *conn)
{
	return SCM_BOOL_F;
}

static scm_sizet
s_pgsql_free(struct sql_connect *conn)
{
	PGconn *pgconn = (PGconn*) conn->data;
	if (!pgconn)
		return 0;
	PQfinish(pgconn);
	return sizeof(pgconn);
}

static SCM
s_pgsql_connect (SCM parmlist, const char *func_name)
{
	char *hostname = NULL;
	char *port = NULL;
	char *dbname = NULL;
	char *user = NULL;
	char *pass = NULL;
	struct gamma_parmdcl dcltab[] = {
		{ "iface",        NULL,          NULL },
		{ "host",         &hostname,     gamma_cvt_string },
		{ "port",         &port,         gamma_cvt_string },
		{ "db",           &dbname,       gamma_cvt_string },
		{ "user",         &user,         gamma_cvt_string },
		{ "pass",         &pass,         gamma_cvt_string },
		{ NULL }
	};
	
	PGconn *pgconn;
	SCM smob;
	struct sql_connect *conn;
	
	gamma_parmlist_parse (parmlist, dcltab, 0, func_name);
	
	pgconn = PQsetdbLogin(hostname, port, NULL, NULL, dbname, user, pass);
	
	if (PQstatus(pgconn) == CONNECTION_BAD) {
		SCM args, pmsg;
		
		free(hostname);
		free(port);
		free(user);
		free(pass);

		pmsg = scm_from_locale_string(PQerrorMessage(pgconn));
		args = scm_list_1(scm_from_locale_string("Cannot connect to the database"));
		PQfinish(pgconn);
		scm_error(gamma_sql_error, func_name,
			  "~A",
			  args,
			  scm_list_2(SCM_BOOL_F, pmsg));
	}

	smob = sql_connect_create("pgsql");
	conn = (struct sql_connect *)SCM_CDR(smob);
	conn->hostname = hostname;
	conn->port = port ? atoi (port) : 0;
	conn->username = user;
	conn->database = dbname;
	conn->data = pgconn;
	return smob;
}

static SCM
result_to_list(PGresult *res)
{
	int i, j;
	int ntuples = PQntuples(res);
	int nfields = PQnfields(res);
	SCM row_head = SCM_EOL, row_tail = SCM_EOL;

	for (i = 0; i < ntuples; i++) {
		SCM new_row;
		SCM head = SCM_EOL, tail;

		for (j = 0; j < nfields; j++) {
			char *val = PQgetvalue(res, i, j);
			SCM new_elt = scm_cons(val ?
					       scm_from_locale_string(val) :
					       SCM_BOOL_F, SCM_EOL);
			if (head == SCM_EOL)
				head = new_elt;
			else
				SCM_SETCDR(tail, new_elt);
			tail = new_elt;
		}

		new_row = scm_cons(head, SCM_EOL);
			
		if (row_head == SCM_EOL) 
			row_head = new_row;
		else 
			SCM_SETCDR(row_tail, new_row);
		row_tail = new_row;
	}
	return row_head;
}

static SCM
s_pgsql_query(struct sql_connect *conn, const char *query)
{
	PGconn *pgconn = (PGconn*) conn->data;
	PGresult       *res;
	SCM cell = SCM_EOL;
	ExecStatusType stat;
	
	res = PQexec(pgconn, query);
	if (!res)
		scm_error(gamma_sql_error, "sql-query",
			  "~A",
			  scm_list_1(scm_from_locale_string("Error executing PostgreSQL query")),
			  scm_list_2(SCM_BOOL_F,
				     scm_from_locale_string(PQerrorMessage(pgconn))));

	stat = PQresultStatus(res);

	switch (stat) {
	case PGRES_COMMAND_OK:
		/* Successful completion of a command returning no data */
		cell = scm_from_ulong(strtoul(PQcmdTuples(res), NULL, 0));
		break;
	case PGRES_TUPLES_OK:
		/* The query successfully executed */
		cell = result_to_list(res);
		PQclear(res);
		break;
	default:
		scm_error(gamma_sql_error, "sql-query",
			  "~A",
			  scm_list_1(scm_from_locale_string("PostgreSQL error")),
			  scm_list_2(scm_from_uint(stat),
				     scm_from_locale_string(PQresStatus(stat))));
	}

	return cell;
}

static void
s_pgsql_close(struct sql_connect *conn)
{
	PGconn *pgconn = (PGconn*) conn->data;
	if (!pgconn)
		return;
	PQfinish(pgconn);
	conn->data = NULL;
}

struct sql_iface pgsql_iface = {
	"pgsql",
	s_pgsql_mark,
	s_pgsql_free,
	s_pgsql_connect,
	s_pgsql_close,
	s_pgsql_query,
};


	

Return to:

Send suggestions and report system problems to the System administrator.