1 /*
2 * %CopyrightBegin%
3 *
4 * Copyright Ericsson AB 2006-2016. All Rights Reserved.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *
18 * %CopyrightEnd%
19 */
20 #include <erl_driver.h>
21
22 #include <libpq-fe.h>
23
24 #include <ei.h>
25
26 #include <stdlib.h>
27 #include <stdio.h>
28 #include <string.h>
29
30 #include "pg_encode.h"
31
encode_ok(ei_x_buff * x)32 void encode_ok(ei_x_buff* x)
33 {
34 const char* k_ok = "ok";
35 ei_x_encode_atom(x, k_ok);
36 }
37
encode_error(ei_x_buff * x,PGconn * conn)38 void encode_error(ei_x_buff* x, PGconn* conn)
39 {
40 const char* k_error = "error";
41 ei_x_encode_tuple_header(x, 2);
42 ei_x_encode_atom(x, k_error);
43 ei_x_encode_string(x, PQerrorMessage(conn));
44 }
45
encode_result(ei_x_buff * x,PGresult * res,PGconn * conn)46 void encode_result(ei_x_buff* x, PGresult* res, PGconn* conn)
47 {
48 int row, n_rows, col, n_cols;
49 switch (PQresultStatus(res)) {
50 case PGRES_TUPLES_OK:
51 n_rows = PQntuples(res);
52 n_cols = PQnfields(res);
53 ei_x_encode_tuple_header(x, 2);
54 encode_ok(x);
55 ei_x_encode_list_header(x, n_rows+1);
56 ei_x_encode_list_header(x, n_cols);
57 for (col = 0; col < n_cols; ++col) {
58 ei_x_encode_string(x, PQfname(res, col));
59 }
60 ei_x_encode_empty_list(x);
61 for (row = 0; row < n_rows; ++row) {
62 ei_x_encode_list_header(x, n_cols);
63 for (col = 0; col < n_cols; ++col) {
64 ei_x_encode_string(x, PQgetvalue(res, row, col));
65 }
66 ei_x_encode_empty_list(x);
67 }
68 ei_x_encode_empty_list(x);
69 break;
70 case PGRES_COMMAND_OK:
71 ei_x_encode_tuple_header(x, 2);
72 encode_ok(x);
73 ei_x_encode_string(x, PQcmdTuples(res));
74 break;
75 default:
76 encode_error(x, conn);
77 break;
78 }
79 }
80
81