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Split DBStructure & View to avoid DB-calls and dependencies for basic operations

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- new "Definition" classes vor DB and Views
- new "Writer" classes to create SQL definitions for DB and Views
- DBStructure & View are responsible to execute DB-querys
This commit is contained in:
Philipp Holzer 2022-07-12 23:21:16 +02:00
commit a910fd8864
Signed by: nupplaPhil
GPG key ID: 24A7501396EB5432
30 changed files with 898 additions and 608 deletions
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src/Util/Writer/ViewDefinitionSqlWriter.php Normal file
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<?php
/**
* @copyright Copyright (C) 2010-2022, the Friendica project
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Util\Writer;
use Friendica\Database\Definition\ViewDefinition;
class ViewDefinitionSqlWriter
{
public static function create(ViewDefinition $definition): string
{
$sqlString = '';
foreach ($definition->getAll() as $viewName => $viewStructure) {
$sqlString .= "--\n";
$sqlString .= "-- VIEW $viewName\n";
$sqlString .= "--\n";
$sqlString .= static::dropView($viewName);
$sqlString .= static::createView($viewName, $viewStructure);
}
return $sqlString;
}
public static function dropView(string $viewName): string
{
return sprintf("DROP VIEW IF EXISTS `%s`", static::escape($viewName)) . ";\n";
}
public static function createView(string $viewName, array $viewStructure): string
{
$sql_rows = [];
foreach ($viewStructure['fields'] as $fieldname => $origin) {
if (is_string($origin)) {
$sql_rows[] = $origin . " AS `" . static::escape($fieldname) . "`";
} elseif (is_array($origin) && (sizeof($origin) == 2)) {
$sql_rows[] = "`" . static::escape($origin[0]) . "`.`" . static::escape($origin[1]) . "` AS `" . static::escape($fieldname) . "`";
}
}
return sprintf("CREATE VIEW `%s` AS SELECT \n\t", static::escape($viewName)) .
implode(",\n\t", $sql_rows) . "\n\t" . $viewStructure['query'] . ";\n\n";
}
public static function escape(string $sqlString): string
{
return str_replace("'", "\\'", $sqlString);
}
}