98 lines
2.9 KiB
PHP
98 lines
2.9 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2010-2023, the Friendica project
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*
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* @license GNU AGPL version 3 or any later version
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*
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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 Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Util\Writer;
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use Friendica\Database\Definition\ViewDefinition;
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/**
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* SQL writer utility for the db view definition
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*/
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class ViewDefinitionSqlWriter
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{
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/**
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* Creates a complete SQL definition bases on a give View Definition class
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*
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* @param ViewDefinition $definition The View definition class
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*
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* @return string The SQL definition as a string
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*/
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public static function create(ViewDefinition $definition): string
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{
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$sqlString = '';
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foreach ($definition->getAll() as $viewName => $viewStructure) {
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$sqlString .= "--\n";
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$sqlString .= "-- VIEW $viewName\n";
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$sqlString .= "--\n";
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$sqlString .= static::dropView($viewName);
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$sqlString .= static::createView($viewName, $viewStructure);
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}
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return $sqlString;
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}
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/**
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* Creates the SQL definition to drop a view
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*
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* @param string $viewName the view name
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*
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* @return string The SQL definition
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*/
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public static function dropView(string $viewName): string
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{
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return sprintf("DROP VIEW IF EXISTS `%s`", static::escape($viewName)) . ";\n";
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}
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/**
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* Creates the SQL definition to create a new view
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*
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* @param string $viewName The view name
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* @param array $viewStructure The structure information of the view
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*
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* @return string The SQL definition
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*/
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public static function createView(string $viewName, array $viewStructure): string
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{
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$sql_rows = [];
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foreach ($viewStructure['fields'] as $fieldname => $origin) {
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if (is_string($origin)) {
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$sql_rows[] = $origin . " AS `" . static::escape($fieldname) . "`";
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} elseif (is_array($origin) && (sizeof($origin) == 2)) {
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$sql_rows[] = "`" . static::escape($origin[0]) . "`.`" . static::escape($origin[1]) . "` AS `" . static::escape($fieldname) . "`";
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}
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}
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return sprintf("CREATE VIEW `%s` AS SELECT \n\t", static::escape($viewName)) .
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implode(",\n\t", $sql_rows) . "\n\t" . $viewStructure['query'] . ";\n\n";
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}
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/**
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* Standard escaping for SQL definitions
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*
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* @param string $sqlString the SQL string to escape
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*
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* @return string escaped SQL string
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*/
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public static function escape(string $sqlString): string
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{
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return str_replace("'", "\\'", $sqlString);
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}
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}
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