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comparison Framework/MySQL/MySQLResult.cpp @ 0:7cea966b6829

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initial commit
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 04 Jul 2018 08:16:29 +0200
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children 5a97c68a7a51
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-1:000000000000 0:7cea966b6829
1 /**
2 * Orthanc - A Lightweight, RESTful DICOM Store
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2018 Osimis S.A., Belgium
6 *
7 * This program is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU Affero General Public License
9 * as published by the Free Software Foundation, either version 3 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Affero General Public License for more details.
16 *
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 **/
20
21
22 #include "MySQLResult.h"
23
24 #include <Core/Logging.h>
25 #include <Core/OrthancException.h>
26
27 #include <mysql/errmsg.h>
28 #include <mysqld_error.h>
29
30 namespace OrthancDatabases
31 {
32 void MySQLResult::Step()
33 {
34 int code = mysql_stmt_fetch(statement_.GetObject());
35
36 if (code == 1)
37 {
38 unsigned int error = mysql_errno(database_.GetObject());
39 if (error == 0)
40 {
41 // This case can occur if the SQL request is not a SELECT
42 done_ = true;
43 }
44 else if (error == CR_SERVER_GONE_ERROR ||
45 error == CR_SERVER_LOST ||
46 error == ER_QUERY_INTERRUPTED)
47 {
48 database_.LogError();
49 throw Orthanc::OrthancException(Orthanc::ErrorCode_DatabaseUnavailable);
50 }
51 else
52 {
53 database_.LogError();
54 throw Orthanc::OrthancException(Orthanc::ErrorCode_Database);
55 }
56 }
57 else
58 {
59 done_ = (code != 0 &&
60 code != MYSQL_DATA_TRUNCATED); // Occurs if mysql_stmt_fetch_column() must be called
61
62 FetchFields();
63 }
64 }
65
66
67 IValue* MySQLResult::FetchField(size_t index)
68 {
69 return statement_.FetchResultField(index);
70 }
71
72
73 MySQLResult::MySQLResult(MySQLDatabase& db,
74 MySQLStatement& statement) :
75 database_(db),
76 statement_(statement)
77 {
78 // !!! https://dev.mysql.com/doc/refman/5.7/en/mysql-stmt-fetch.html
79 // https://gist.github.com/hoterran/6365915
80 // https://github.com/hholzgra/connector-c-examples/blob/master/mysql_stmt_bind_result.c
81
82 SetFieldsCount(statement_.GetResultFieldsCount());
83
84 Step();
85 }
86
87
88 MySQLResult::~MySQLResult()
89 {
90 // Reset the statement for further use
91 if (mysql_stmt_reset(statement_.GetObject()) != 0)
92 {
93 LOG(ERROR) << "Cannot reset the statement, expect an error";
94 }
95 }
96
97
98 void MySQLResult::Next()
99 {
100 if (IsDone())
101 {
102 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
103 }
104 else
105 {
106 Step();
107 }
108 }
109 }