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695 lines
24 KiB
695 lines
24 KiB
<?php
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/* For licensing terms, see /license.txt */
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/**
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* This is the main database library for Chamilo.
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* Include/require it in your code to use its functionality.
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*
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* This library now uses a Doctrine DBAL Silex service provider
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*
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* @package chamilo.library
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*/
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/**
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* Database class definition
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* @package chamilo.database
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*/
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class Database
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{
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/**
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* The main connection
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*
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* @var \Doctrine\DBAL\Connection
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*/
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private static $db;
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/**
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* Read connection
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*
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* @var \Doctrine\DBAL\Connection
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*/
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private static $connectionRead;
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/**
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* Write connection
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*
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* @var \Doctrine\DBAL\Connection
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*/
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private static $connectionWrite;
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/**
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* Constructor
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*
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* @param $db \Doctrine\DBAL\Connection
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* @param array $dbs
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*/
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public function __construct($db, $dbs)
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{
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self::setDatabase($db, $dbs);
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}
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/**
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* @param $db
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* @param $dbs
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*/
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public function setDatabase($db, $dbs)
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{
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self::$db = $db;
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// Using read/write connections see the services.php file
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self::$connectionRead = isset($dbs['db_read']) ? $dbs['db_read'] : $db;
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self::$connectionWrite = isset($dbs['db_write']) ? $dbs['db_write'] : $db;
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}
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/**
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* Return current connection
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* @return \Doctrine\DBAL\Connection
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*/
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public function getConnection()
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{
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return self::$db;
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}
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/* Variable use only in the installation process to log errors. See the Database::query function */
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// static $log_queries = false;
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/**
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* Returns the name of the main database.
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* @return string
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*/
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public static function get_main_database()
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{
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return self::$db->getDatabase();
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}
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/**
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* The glue is the string needed between database and table.
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* The trick is: in multiple databases, this is a period (with backticks).
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* In single database, this can be e.g. an underscore so we just fake
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* there are multiple databases and the code can be written independent
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* of the single / multiple database setting.
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* @return string
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*/
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public static function get_database_glue()
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{
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return `.`;
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}
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/*
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Table name methods
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Use these methods to get table names for queries,
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instead of constructing them yourself.
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Backticks automatically surround the result,
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e.g. COURSE_NAME.link
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so the queries can look cleaner.
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Example:
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$table = Database::get_course_table(TABLE_DOCUMENT);
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$sql_query = "SELECT * FROM $table WHERE $condition";
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$sql_result = Database::query($sql_query);
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$result = Database::fetch_array($sql_result);
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*/
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/**
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* This function returns the correct complete name of any table of the main
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* database of which you pass the short name as a parameter.
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* Define table names as constants in this library and use them
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* instead of directly using magic words in your tool code.
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*
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* @param string $short_table_name, the name of the table
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* @return string
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*/
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public static function get_main_table($short_table_name)
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{
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return self::format_table_name(self::get_main_database(), $short_table_name);
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}
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/**
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* This method returns the correct complete name of any course table of
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* which you pass the short name as a parameter.
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* Define table names as constants in this library and use them
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* instead of directly using magic words in your tool code.
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*
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* @param string $short_table_name, the name of the table
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* @return string
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*
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*/
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public static function get_course_table($short_table_name)
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{
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return self::format_table_name(self::get_main_database(), DB_COURSE_PREFIX.$short_table_name);
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}
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/**
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* Returns the number of affected rows in the last database operation.
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* @param \Doctrine\DBAL\Driver\Statement $result
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* @return int
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*/
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public static function affected_rows(\Doctrine\DBAL\Driver\Statement $result = null)
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{
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return $result->rowCount();
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//return self::use_default_connection($connection) ? mysql_affected_rows() : mysql_affected_rows($connection);
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}
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/**
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* Gets the array from a SQL result (as returned by Database::query) - help achieving database independence
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* @param resource The result from a call to sql_query (e.g. Database::query)
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* @param string Optional: "ASSOC","NUM" or "BOTH", as the constant used in mysql_fetch_array.
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* @return array Array of results as returned by php
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* @author Yannick Warnier <yannick.warnier@beeznest.com>
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*/
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public static function fetch_array(\Doctrine\DBAL\Driver\Statement $result, $option = 'BOTH')
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{
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if ($result === false) {
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return array();
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}
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return $result->fetch(self::customOptionToDoctrineOption($option));
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/*return $option == 'ASSOC' ? mysql_fetch_array($result, MYSQL_ASSOC) : ($option == 'NUM' ? mysql_fetch_array(
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$result,
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MYSQL_NUM
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) : mysql_fetch_array($result));*/
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}
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/**
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* Gets an associative array from a SQL result (as returned by Database::query).
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* This method is equivalent to calling Database::fetch_array() with 'ASSOC' value for the optional second parameter.
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* @param resource $result The result from a call to sql_query (e.g. Database::query).
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* @return array Returns an associative array that corresponds to the fetched row and moves the internal data pointer ahead.
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*/
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public static function fetch_assoc(\Doctrine\DBAL\Driver\Statement $result)
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{
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return $result->fetch(PDO::FETCH_ASSOC);
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//return mysql_fetch_assoc($result);
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}
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/**
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* Gets the next row of the result of the SQL query (as returned by Database::query) in an object form
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* @param \Doctrine\DBAL\Driver\Statement The result from a call to Database::query())
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* @param string Optional class name to instanciate
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* @param array Optional array of parameters
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* @return object Object of class StdClass or the required class, containing the query result row
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* @author Yannick Warnier <yannick.warnier@dokeos.com>
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*/
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public static function fetch_object(\Doctrine\DBAL\Driver\Statement $result)
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{
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// Waiting for http://www.doctrine-project.org/jira/browse/DBAL-544 in order to know which constant use.
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//return $result->fetch(\Doctrine\ORM\Query::HYDRATE_OBJECT);
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return $result->fetch(PDO::FETCH_OBJ);
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/*return !empty($class) ? (is_array($params) ? mysql_fetch_object($result, $class, $params) : mysql_fetch_object(
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$result,
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$class
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)) : mysql_fetch_object($result);*/
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}
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/**
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* Gets the array from a SQL result (as returned by Database::query) - help achieving database independence
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* @param \Doctrine\DBAL\Driver\Statement The result from a call to Database::query())
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* @return array Array of results as returned by php
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*/
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public static function fetch_row(\Doctrine\DBAL\Driver\Statement $result)
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{
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return $result->fetch(PDO::FETCH_NUM);
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//return mysql_fetch_row($result);
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}
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/**
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* Gets the ID of the last item inserted into the database
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* @return int The last ID as returned by the DB function
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*/
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public static function insert_id()
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{
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return self::$connectionWrite->lastInsertId();
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}
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/**
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* Gets the number of rows from the last query result - help achieving database independence
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* @param \Doctrine\DBAL\Driver\Statement
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* @return integer The number of rows contained in this result
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**/
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public static function num_rows(\Doctrine\DBAL\Driver\Statement $result)
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{
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return $result->rowCount();
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}
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/**
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* Acts as the relative *_result() function of most DB drivers and fetches a
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* specific line and a field
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* @param \Doctrine\DBAL\Driver\Statement The database resource to get data from
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* @param integer The row number
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* @param string Optional field name or number
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* @return mixed One cell of the result, or FALSE on error
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*/
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public static function result(\Doctrine\DBAL\Driver\Statement $resource, $row, $field = 0)
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{
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if ($resource->rowCount() > 0) {
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$result = $resource->fetchAll(PDO::FETCH_BOTH);
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return $result[$row][$field];
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}
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return null;
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}
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/**
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* Frees all the memory associated with the provided result identifier.
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* @return bool Returns TRUE on success or FALSE on failure.
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* Notes: Use this method if you are concerned about how much memory is being used for queries that return large result sets.
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* Anyway, all associated result memory is automatically freed at the end of the script's execution.
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*/
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public static function free_result(\Doctrine\DBAL\Driver\Statement $result)
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{
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$result->closeCursor();
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//return mysql_free_result($result);
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}
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/**
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* Detects if a query is going to modify something in the database in order to use the write connection
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* @param string $query
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* @return bool
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*/
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public static function isWriteQuery($query)
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{
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$isWriteQuery = preg_match("/UPDATE(.*) FROM/i", $query) ||
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preg_match("/INSERT INTO/i", $query) ||
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preg_match("/REPLACE INTO/i", $query) ||
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preg_match("/DELETE FROM/i", $query);
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return $isWriteQuery;
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}
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/**
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* Escapes a string to insert into the database as text
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* @param string The string to escape
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* @return string The escaped string
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*/
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public static function escape_string($string)
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{
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/* The pdo::quote function adds a "'" character we need to remove that '
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because in Chamilo, developers builds a query like this:
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$sql = "SELECT * FROM $table WHERE id = 'Database::escape_string($id)'";
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otherwise we will have an error because the query will be:
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SELECT * FROM user WHERE id = ''1'' instead of
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SELECT * FROM user WHERE id = '1'
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*/
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// $string = '_@_'.self::$db->quote($string).'_@_';
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$string = self::$db->quote($string);
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return trim($string, "'");
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return $string;
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}
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/**
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* Executes a query in the database
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* @author Julio Montoya
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* @param string $query The SQL query
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* @return \Doctrine\DBAL\Driver\Statement
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*/
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public static function query($query)
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{
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$isWriteQuery = self::isWriteQuery($query);
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if ($isWriteQuery) {
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$connection = self::$connectionWrite;
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} else {
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$connection = self::$connectionRead;
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}
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/* The solution below does not work because there are some case where we use the "LIKE" option like this:
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$sql = 'SELECT * FROM user WHERE id LIKE "%'.Database::escape_string($id).' %" ;
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Chamilo queries are formed in many ways:
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$sql = "SELECT * FROM user WHERE id = '".Database::escape_string($id)."'; or
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$sql = 'SELECT * FROM user WHERE id = '.Database::escape_string($id).';
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The problem here is that the function escape_string() calls the quote function that adds a "'" string.
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Instead of this we're adding a identifier __@__ so we can identify those cases and replace with a simple '
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*/
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//var_dump($query);
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/*$query = str_replace(
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array(
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"\"_@_'",
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"'_@_\"",
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"'_@_'",
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"_@_'",
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"'_@_",
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),
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"'",
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$query
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);*/
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//var_dump($query);
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return $connection->executeQuery($query);
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}
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public static function customOptionToDoctrineOption($option)
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{
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switch($option) {
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case 'ASSOC':
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return PDO::FETCH_ASSOC;
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break;
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case 'NUM':
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return PDO::FETCH_NUM;
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break;
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case 'BOTH':
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default:
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return PDO::FETCH_BOTH;
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break;
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}
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}
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/**
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* Stores a query result into an array.
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* @param \Doctrine\DBAL\Driver\Statement $result - the return value of the query
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* @param option BOTH, ASSOC, or NUM
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* @return array - the value returned by the query
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*/
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public static function store_result(\Doctrine\DBAL\Driver\Statement $result, $option = 'BOTH')
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{
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return $result->fetchAll(self::customOptionToDoctrineOption($option));
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/*
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var_dump($a );
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$array = array();
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if ($result !== false) { // For isolation from database engine's behaviour.
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while ($row = self::fetch_array($result, $option)) {
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$array[] = $row;
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}
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}
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return $array;*/
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}
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/*
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Private methods
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You should not access these from outside the class
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No effort is made to keep the names / results the same.
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*/
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/**
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* Structures a database and table name to ready them
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* for querying. The database parameter is considered not glued,
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* just plain e.g. COURSE001
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* @todo not sure if we need this now
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*/
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private static function format_table_name($database, $table)
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{
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/*$glue = '`.`';
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$table_name = '`'.$database.$glue.$table.'`';
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*/
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return $table;
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//return $table_name;
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}
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/*
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New useful DB functions
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*/
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/**
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* Executes an insert to in the database (dbal already escape strings)
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* @param string table name
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* @param array An array of field and values
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* @param bool show query
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* @return int the id of the latest executed query
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*/
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public static function insert($table_name, $attributes, $show_query = false)
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{
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$result = self::$connectionWrite->insert($table_name, $attributes);
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if ($result) {
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return self::insert_id();
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}
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return false;
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}
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/**
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* Experimental useful database finder
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* @todo lot of stuff to do here
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* @todo known issues, it doesn't work when using LIKE conditions
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* @example array('where'=> array('course_code LIKE "?%"'))
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* @example array('where'=> array('type = ? AND category = ?' => array('setting', 'Plugins'))
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* @example array('where'=> array('name = "Julio" AND lastname = "montoya"))
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*/
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public static function select($columns, $table_name, $conditions = array(), $type_result = 'all', $option = 'ASSOC')
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{
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//$qb = self::$db->createQueryBuilder();
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$conditions = self::parse_conditions($conditions);
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//@todo we could do a describe here to check the columns ...
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$clean_columns = '';
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if (is_array($columns)) {
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$clean_columns = implode(',', $columns);
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} else {
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if ($columns == '*') {
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$clean_columns = '*';
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} else {
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$clean_columns = (string)$columns;
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}
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}
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/*$qb->select($clean_columns);
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$qb->from($table_name, 'table');
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$qb->orderBy('table.' . $sort_order, 'ASC');*/
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$sql = "SELECT $clean_columns FROM $table_name $conditions";
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//var_dump($sql);
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$result = self::query($sql);
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$array = array();
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if ($type_result == 'all') {
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while ($row = self::fetch_array($result, $option)) {
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if (isset($row['id'])) {
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$array[$row['id']] = $row;
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} else {
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$array[] = $row;
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}
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}
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} else {
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$array = self::fetch_array($result, $option);
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}
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return $array;
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}
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/**
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* Parses WHERE/ORDER conditions i.e array('where'=>array('id = ?' =>'4'), 'order'=>'id DESC'))
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* @todo known issues, it doesn't work when using LIKE conditions example: array('where'=>array('course_code LIKE "?%"'))
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* @param array
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* @return string
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* @todo lot of stuff to do here
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*/
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static function parse_conditions($conditions)
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{
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if (empty($conditions)) {
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return '';
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}
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$return_value = $where_return = '';
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foreach ($conditions as $type_condition => $condition_data) {
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if ($condition_data == false) {
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continue;
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}
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$type_condition = strtolower($type_condition);
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switch ($type_condition) {
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case 'where':
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foreach ($condition_data as $condition => $value_array) {
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if (is_array($value_array)) {
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$clean_values = array();
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foreach ($value_array as $item) {
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$item = Database::escape_string($item);
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$clean_values[] = $item;
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}
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} else {
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$value_array = Database::escape_string($value_array);
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$clean_values = $value_array;
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}
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if (!empty($condition) && $clean_values != '') {
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$condition = str_replace('%', "'@percentage@'", $condition); //replace "%"
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$condition = str_replace("'?'", "%s", $condition);
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$condition = str_replace("?", "%s", $condition);
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$condition = str_replace("@%s@", "@-@", $condition);
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$condition = str_replace("%s", "'%s'", $condition);
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$condition = str_replace("@-@", "@%s@", $condition);
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//Treat conditons as string
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$condition = vsprintf($condition, $clean_values);
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$condition = str_replace('@percentage@', '%', $condition); //replace "%"
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$where_return .= $condition;
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}
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}
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if (!empty($where_return)) {
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$return_value = " WHERE $where_return";
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}
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break;
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case 'order':
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$order_array = $condition_data;
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if (!empty($order_array)) {
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// 'order' => 'id desc, name desc'
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$order_array = $order_array;
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$new_order_array = explode(',', $order_array);
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$temp_value = array();
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|
|
foreach ($new_order_array as $element) {
|
|
$element = explode(' ', $element);
|
|
$element = array_filter($element);
|
|
$element = array_values($element);
|
|
|
|
if (!empty($element[1])) {
|
|
$element[1] = strtolower($element[1]);
|
|
$order = 'DESC';
|
|
if (in_array($element[1], array('desc', 'asc'))) {
|
|
$order = $element[1];
|
|
}
|
|
$temp_value[] = $element[0].' '.$order.' ';
|
|
} else {
|
|
//by default DESC
|
|
$temp_value[] = $element[0].' DESC ';
|
|
}
|
|
}
|
|
if (!empty($temp_value)) {
|
|
$return_value .= ' ORDER BY '.implode(', ', $temp_value);
|
|
}
|
|
}
|
|
|
|
break;
|
|
case 'limit':
|
|
$limit_array = explode(',', $condition_data);
|
|
|
|
if (!empty($limit_array)) {
|
|
if (count($limit_array) > 1) {
|
|
$return_value .= ' LIMIT '.intval($limit_array[0]).' , '.intval($limit_array[1]);
|
|
} else {
|
|
$return_value .= ' LIMIT '.intval($limit_array[0]);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return $return_value;
|
|
}
|
|
|
|
/**
|
|
* @param array $conditions
|
|
* @return string
|
|
*/
|
|
public static function parse_where_conditions($conditions)
|
|
{
|
|
return self::parse_conditions(array('where' => $conditions));
|
|
}
|
|
|
|
/**
|
|
* Deletes an item depending of conditions
|
|
* @param string $table_name
|
|
* @param array $where_conditions
|
|
* @param bool $show_query
|
|
* @return int
|
|
*/
|
|
public static function delete($table_name, $where_conditions, $show_query = false)
|
|
{
|
|
//return self::$connectionWrite->delete($table_name, $where_conditions);
|
|
|
|
$where_return = self::parse_where_conditions($where_conditions);
|
|
$sql = "DELETE FROM $table_name $where_return ";
|
|
if ($show_query) {
|
|
echo $sql;
|
|
echo '<br />';
|
|
}
|
|
$result = self::query($sql);
|
|
$affected_rows = self::affected_rows($result);
|
|
|
|
//@todo should return affected_rows for
|
|
return $affected_rows;
|
|
}
|
|
|
|
/**
|
|
* Experimental useful database update
|
|
* @param string table name use Database::get_main_table
|
|
* @param array array with values to updates, keys are the fields in the database:
|
|
* @example: $params['name'] = 'Julio'; $params['lastname'] = 'Montoya';
|
|
* @param array where conditions i.e array('id = ?' =>'4')
|
|
* @param bool show query
|
|
* @todo lot of stuff to do here
|
|
*/
|
|
public static function update($table_name, $attributes, $where_conditions = array(), $show_query = false)
|
|
{
|
|
if (!empty($table_name) && !empty($attributes)) {
|
|
$update_sql = '';
|
|
//Cleaning attributes
|
|
$count = 1;
|
|
foreach ($attributes as $key => $value) {
|
|
|
|
if (!is_array($value)) {
|
|
$value = self::escape_string($value);
|
|
}
|
|
$update_sql .= "$key = '$value' ";
|
|
if ($count < count($attributes)) {
|
|
$update_sql .= ', ';
|
|
}
|
|
$count++;
|
|
}
|
|
if (!empty($update_sql)) {
|
|
//Parsing and cleaning the where conditions
|
|
$where_return = self::parse_where_conditions($where_conditions);
|
|
$sql = "UPDATE $table_name SET $update_sql $where_return ";
|
|
if ($show_query) {
|
|
var_dump($sql);
|
|
}
|
|
$result = self::query($sql);
|
|
$affected_rows = self::affected_rows($result);
|
|
|
|
return $affected_rows;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Counts the number of rows in a table
|
|
* @param string $table The table of which the rows should be counted
|
|
* @return int The number of rows in the given table.
|
|
*/
|
|
public static function count_rows($table)
|
|
{
|
|
$obj = self::fetch_object(self::query("SELECT COUNT(*) AS n FROM $table"));
|
|
return $obj->n;
|
|
}
|
|
|
|
/**
|
|
* Returns a list of tables within a database. The list may contain all of the
|
|
* available table names or filtered table names by using a pattern.
|
|
* @param string $database (optional) The name of the examined database.
|
|
* @param string $pattern (optional) A pattern for filtering table names as if it was needed for the SQL's LIKE clause, for example 'access_%'.
|
|
* @deprecated
|
|
* @return array Returns in an array the retrieved list of table names.
|
|
*/
|
|
public static function get_tables($database = '', $pattern = '')
|
|
{
|
|
$result = array();
|
|
$query = "SHOW TABLES";
|
|
if (!empty($database)) {
|
|
$query .= " FROM `".self::escape_string($database)."`";
|
|
}
|
|
if (!empty($pattern)) {
|
|
$query .= " LIKE '".self::escape_string($pattern)."'";
|
|
}
|
|
$query_result = Database::query($query);
|
|
while ($row = Database::fetch_row($query_result)) {
|
|
$result[] = $row[0];
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Returns a list of databases created on the server. The list may contain all of the
|
|
* available database names or filtered database names by using a pattern.
|
|
* @return array Returns in an array the retrieved list of database names.
|
|
*/
|
|
public static function get_databases()
|
|
{
|
|
$sm = self::$db->getSchemaManager();
|
|
return $sm->listDatabases();
|
|
}
|
|
}
|
|
|