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