Mercurial > hg > orthanc-databases
annotate Framework/MySQL/MySQLResult.cpp @ 522:c49136b34891 large-queries tip
use a prepared statement for InsertOrUpdateMetadata
| author | Alain Mazy <am@orthanc.team> |
|---|---|
| date | Fri, 05 Jul 2024 09:15:54 +0200 |
| parents | 54d518dcd74a |
| children |
| rev | line source |
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| 0 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
| 4 * Department, University Hospital of Liege, Belgium | |
|
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5 * Copyright (C) 2017-2023 Osimis S.A., Belgium |
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium |
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
| 0 | 8 * |
| 9 * This program is free software: you can redistribute it and/or | |
| 10 * modify it under the terms of the GNU Affero General Public License | |
| 11 * as published by the Free Software Foundation, either version 3 of | |
| 12 * the License, or (at your option) any later version. | |
| 13 * | |
| 14 * This program is distributed in the hope that it will be useful, but | |
| 15 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 17 * Affero General Public License for more details. | |
| 18 * | |
| 19 * You should have received a copy of the GNU Affero General Public License | |
| 20 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 21 **/ | |
| 22 | |
| 23 | |
| 24 #include "MySQLResult.h" | |
| 25 | |
| 152 | 26 #include <Logging.h> |
| 27 #include <OrthancException.h> | |
| 0 | 28 |
| 6 | 29 #include <errmsg.h> |
| 0 | 30 #include <mysqld_error.h> |
| 31 | |
| 32 namespace OrthancDatabases | |
| 33 { | |
| 34 void MySQLResult::Step() | |
| 35 { | |
| 36 int code = mysql_stmt_fetch(statement_.GetObject()); | |
| 37 | |
| 38 if (code == 1) | |
| 39 { | |
| 40 unsigned int error = mysql_errno(database_.GetObject()); | |
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41 |
| 0 | 42 if (error == 0) |
| 43 { | |
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44 // This case occurs in requests without a result (e.g. if the |
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45 // SQL request is not a SELECT) |
| 0 | 46 done_ = true; |
| 47 } | |
| 48 else | |
| 49 { | |
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50 database_.ThrowException(); |
| 0 | 51 } |
| 52 } | |
| 53 else | |
| 54 { | |
| 55 done_ = (code != 0 && | |
| 56 code != MYSQL_DATA_TRUNCATED); // Occurs if mysql_stmt_fetch_column() must be called | |
| 57 | |
| 58 FetchFields(); | |
| 59 } | |
| 60 } | |
| 61 | |
| 62 | |
| 63 IValue* MySQLResult::FetchField(size_t index) | |
| 64 { | |
| 65 return statement_.FetchResultField(index); | |
| 66 } | |
| 67 | |
| 68 | |
| 69 MySQLResult::MySQLResult(MySQLDatabase& db, | |
| 70 MySQLStatement& statement) : | |
| 71 database_(db), | |
| 72 statement_(statement) | |
| 73 { | |
| 74 // !!! https://dev.mysql.com/doc/refman/5.7/en/mysql-stmt-fetch.html | |
| 75 // https://gist.github.com/hoterran/6365915 | |
| 76 // https://github.com/hholzgra/connector-c-examples/blob/master/mysql_stmt_bind_result.c | |
| 77 | |
| 78 SetFieldsCount(statement_.GetResultFieldsCount()); | |
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79 |
| 0 | 80 Step(); |
| 81 } | |
| 82 | |
| 83 | |
| 84 MySQLResult::~MySQLResult() | |
| 85 { | |
| 86 // Reset the statement for further use | |
| 87 if (mysql_stmt_reset(statement_.GetObject()) != 0) | |
| 88 { | |
| 89 LOG(ERROR) << "Cannot reset the statement, expect an error"; | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 | |
| 94 void MySQLResult::Next() | |
| 95 { | |
| 96 if (IsDone()) | |
| 97 { | |
| 98 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); | |
| 99 } | |
| 100 else | |
| 101 { | |
| 102 Step(); | |
| 103 } | |
| 104 } | |
| 105 } |