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path: root/src/pgsql.c
authorSergey Poznyakoff <gray@gnu.org.ua>2001-12-06 17:36:21 (GMT)
committer Sergey Poznyakoff <gray@gnu.org.ua>2001-12-06 17:36:21 (GMT)
commit9339b8ad47f5ae70ac1567a3b87caadd78ed022a (patch) (side-by-side diff)
tree46ee93b378bebbef132154a237a735cf3eb4f7d8 /src/pgsql.c
downloadgamma-9339b8ad47f5ae70ac1567a3b87caadd78ed022a.tar.gz
gamma-9339b8ad47f5ae70ac1567a3b87caadd78ed022a.tar.bz2
Initial revision
Diffstat (limited to 'src/pgsql.c') (more/less context) (ignore whitespace changes)
-rw-r--r--src/pgsql.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/src/pgsql.c b/src/pgsql.c
new file mode 100644
index 0000000..956f517
--- a/dev/null
+++ b/src/pgsql.c
@@ -0,0 +1,140 @@
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <string.h>
+#include <guile-sql.h>
+#include <libpq-fe.h>
+
+SCM
+s_pgsql_mark(struct sql_connect *conn)
+{
+ return SCM_BOOL_F;
+}
+
+scm_sizet
+s_pgsql_free(struct sql_connect *conn)
+{
+ PGconn *pgconn = (PGconn*) conn->data;
+ if (!pgconn)
+ return 0;
+ PQfinish(pgconn);
+ return sizeof(pgconn);
+}
+
+SCM
+s_pgsql_connect (char *hostname, int port,
+ char *dbname, char *user, char *pass, char *why)
+{
+ PGconn *pgconn;
+ char buf[24];
+ SCM smob;
+ struct sql_connect *conn;
+
+ snprintf(buf, sizeof buf, "%d", port);
+ pgconn = PQsetdbLogin(hostname, buf, NULL, NULL, dbname, user, pass);
+ if (PQstatus(pgconn) == CONNECTION_BAD)
+ return SCM_BOOL_F;
+
+ smob = sql_connect_create("pgsql");
+ conn = (struct sql_connect *)SCM_CDR(smob);
+ conn->data = pgconn;
+ return smob;
+}
+
+SCM
+result_to_list(PGresult *res)
+{
+ int i, j;
+ int ntuples = PQntuples(res);
+ int nfields = PQnfields(res);
+ SCM row_head = SCM_EOL, row_tail;
+
+ for (i = 0; i < ntuples; i++) {
+ SCM new_row;
+ SCM head = SCM_EOL, tail;
+
+ for (j = 0; j < nfields; j++) {
+ SCM new_elt;
+ char *val = PQgetvalue(res, i, j);
+ SCM_NEWCELL(new_elt);
+ SCM_SETCAR(new_elt, scm_makfrom0str(val));
+ if (head == SCM_EOL)
+ head = new_elt;
+ else
+ SCM_SETCDR(tail, new_elt);
+ tail = new_elt;
+ }
+
+ if (head != SCM_EOL)
+ SCM_SETCDR(tail, SCM_EOL);
+
+ SCM_NEWCELL(new_row);
+ SCM_SETCAR(new_row, head);
+
+ if (row_head == SCM_EOL)
+ row_head = new_row;
+ else
+ SCM_SETCDR(row_tail, new_row);
+ row_tail = new_row;
+ }
+ if (row_head != SCM_EOL)
+ SCM_SETCDR(row_tail, SCM_EOL);
+ return row_head;
+}
+
+SCM
+s_pgsql_query(struct sql_connect *conn, char *query)
+{
+ PGconn *pgconn = (PGconn*) conn->data;
+ PGresult *res;
+ SCM cell;
+ ExecStatusType stat;
+
+ res = PQexec(pgconn, query);
+ if (!res)
+ scm_misc_error("s_mgsql_query",
+ "pgSQL error: ~S",
+ SCM_LIST1(scm_makfrom0str(PQerrorMessage(pgconn))));
+
+ stat = PQresultStatus(res);
+
+ switch (stat) {
+ case PGRES_COMMAND_OK:
+ /* Successful completion of a command returning no data */
+ cell = scm_makenum(strtoul(PQcmdTuples(res), NULL, 0));
+ break;
+ case PGRES_TUPLES_OK:
+ /* The query successfully executed */
+ cell = result_to_list(res);
+ PQclear(res);
+ break;
+ default:
+ scm_misc_error("s_mgsql_query",
+ "pgSQL error: ~S",
+ SCM_LIST1(scm_makfrom0str(PQresStatus(stat))));
+ }
+
+ return cell;
+}
+
+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,
+};
+
+
+

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