83 lines
3.0 KiB
C++
83 lines
3.0 KiB
C++
/*
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Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "client/base/show_variable_query_extractor.h"
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#include <functional>
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using namespace Mysql::Tools::Base;
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using std::string;
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using std::vector;
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using std::placeholders::_1;
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Show_variable_query_extractor::Show_variable_query_extractor()
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: m_exists(false) {}
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int64 Show_variable_query_extractor::extract_variable(
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const Mysql_query_runner::Row &result_row) {
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this->m_extracted_variable = result_row[0];
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this->m_exists = true;
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Mysql_query_runner::cleanup_result(result_row);
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return 0;
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}
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int64 Show_variable_query_extractor::get_variable_value(
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Mysql_query_runner *query_runner_to_copy, string variable, string &value,
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bool &exists) {
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Show_variable_query_extractor extractor;
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Mysql_query_runner query_runner_to_use(*query_runner_to_copy);
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std::function<int64(const Mysql_query_runner::Row &)> result_cb = std::bind(
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&Show_variable_query_extractor::extract_variable, &extractor, _1);
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query_runner_to_use.add_result_callback(&result_cb);
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/*
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Note: Because MySQL uses the C escape syntax in strings (for example, '\n'
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to represent newline), you must double any '\' that you use in your LIKE
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strings. For example, to search for '\n', specify it as '\\n'.To search for
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'\', specify it as '\\\\' (the backslashes are stripped once by the parser
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and another time when the pattern match is done, leaving a single backslash
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to be matched).
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Example: "t\1" = > "t\\\\1"
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*/
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string quoted_variable;
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for (size_t i = 0; i < variable.size(); i++) {
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if (variable[i] == '\\') {
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quoted_variable.append(3, '\\');
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} else if (variable[i] == '\'' || variable[i] == '_' ||
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variable[i] == '%') {
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quoted_variable += '\\';
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}
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quoted_variable += variable[i];
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}
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query_runner_to_use.run_query("SELECT @@global." + quoted_variable);
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value = extractor.m_extracted_variable;
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exists = extractor.m_exists;
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return 0;
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}
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