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/**
***********************************************************************************************
* @copyright 2004-2016 The Admidio Team
* @see http://www.admidio.org/
* @license https://www.gnu.org/licenses/gpl-2.0.html GNU General Public License v2.0 only
***********************************************************************************************
*/
/**
* @class TableAccess
* @brief Controls read and write access to datbase tables
*
* This class should help you to read and write records of database tables.
* You create an object for a special table and than you are able to read
* a special record, manipulate him and write him back. Also new records can
* be created with this class. The advantage of this class is that you are
* independent from SQL. You can use @c getValue, @c setValue, @c readData
* and @c save to handle the record.
* @par Examples
* @code // create an object for table adm_roles of role 4711
* $roleId = 4177;
* $role = new TableAccess($gDb, TBL_ROLES, 'rol', $roleId);
*
* // read max. Members and add 1 to the count
* $maxMembers = $role->getValue('rol_max_members');
* $maxMembers = $maxMembers + 1;
* $role->setValue('rol_max_members', $maxMembers);
* $role->save(); @endcode
*/
class TableAccess
{
protected $additionalTables; ///< Array with sub array that contains additional tables and their connected fields that should be selected when data is read
protected $tableName; ///< Name of the database table of this object. This must be the table name with the installation specific praefix e.g. @b demo_users
protected $columnPrefix; ///< The praefix of each column that this table has. E.g. the table adm_users has the column praefix @b usr
protected $keyColumnName; ///< Name of the unique autoincrement index column of the database table
protected $db; ///< An object of the class Database for communication with the database
protected $new_record; // Merker, ob ein neuer Datensatz oder vorhandener Datensatz bearbeitet wird
protected $columnsValueChanged; ///< Flag will be set to true if data in array dbColumns was changed
public $dbColumns = array(); // Array ueber alle Felder der entsprechenden Tabelle zu dem gewaehlten Datensatz
public $columnsInfos = array(); // Array, welches weitere Informationen (geaendert ja/nein, Feldtyp) speichert
/**
* Constructor that will create an object of a recordset of the specified table.
* If the id is set than this recordset will be loaded.
* @param \Database $database Object of the class Database. This should be the default global object @b $gDb.
* @param string $tableName The name of the database table. Because of specific praefixes this should be the define value e.g. @b TBL_USERS
* @param string $columnPrefix The prefix of each column of that table. E.g. for table @b adm_roles this is @b rol
* @param string|int $id The id of the recordset that should be loaded. If id isn't set than an empty object of the table is created.
*/
public function __construct(&$database, $tableName, $columnPrefix, $id = '')
{
$this->tableName = $tableName;
$this->columnPrefix = $columnPrefix;
$this->setDatabase($database);
// if a id is commited, then read data out of database
if((!is_numeric($id) && $id !== '') || (is_numeric($id) && $id > 0))
{
$this->readDataById($id);
}
else
{
$this->clear();
}
}
/**
* Called on serialization of this object. The database object could not
* be serialized and should be ignored.
* @return string[] Returns all class variables that should be serialized.
*/
public function __sleep()
{
return array_diff(array_keys(get_object_vars($this)), array('db'));
}
/**
* Initializes all class parameters and deletes all read data.
* Also the database structure of the associated table will be
* read and stored in the arrays @b dbColumns and @b columnsInfos
*/
public function clear()
{
$this->columnsValueChanged = false;
$this->new_record = true;
if(count($this->columnsInfos) > 0)
{
// die Spalteninfos wurden bereits eingelesen
// und werden nun nur noch neu initialisiert
foreach($this->dbColumns as $field_name => $field_value)
{
$this->dbColumns[$field_name] = '';
$this->columnsInfos[$field_name]['changed'] = false;
}
}
else
{
// alle Spalten der Tabelle ins Array einlesen und auf leer setzen
$columnProperties = $this->db->showColumns($this->tableName);
foreach($columnProperties as $key => $value)
{
$this->dbColumns[$key] = '';
$this->columnsInfos[$key]['changed'] = false;
$this->columnsInfos[$key]['type'] = $value['type'];
$this->columnsInfos[$key]['null'] = $value['null'];
$this->columnsInfos[$key]['key'] = $value['key'];
$this->columnsInfos[$key]['serial'] = $value['serial'];
if($value['serial'] == 1)
{
$this->keyColumnName = $key;
}
}
}
}
/**
* Adds a table with the connected fields to a member array. This table will be add to the
* select statement if data is read and the connected record is avaiable in this class.
* The connected table must have a foreign key in the class table.
* @param string $table Database table name that should be connected. This can be the define of the table.
* @param string $columnNameAdditionalTable Name of the column in the connected table that has the foreign key to the class table
* @param string $columnNameClassTable Name of the column in the class table that has the foreign key to the connected table
* @par Examples
* @code // Constructor of adm_dates object where the category (calendar) is connected
* public function __construct(&$db, $dat_id = 0)
* {
* $this->connectAdditionalTable(TBL_CATEGORIES, 'cat_id', 'dat_cat_id');
* parent::__construct($db, TBL_DATES, 'dat', $dat_id);
* } @endcode
*/
protected function connectAdditionalTable($table, $columnNameAdditionalTable, $columnNameClassTable)
{
$this->additionalTables[] = array(
'table' => $table,
'columnNameAdditionalTable' => $columnNameAdditionalTable,
'columnNameClassTable' => $columnNameClassTable
);
}
/**
* Reads the number of all records of this table
* @return int Number of records of this table
*/
public function countAllRecords()
{
$sql = 'SELECT COUNT(*) AS count FROM '.$this->tableName;
$countStatement = $this->db->query($sql);
return (int) $countStatement->fetchColumn();
}
/**
* Deletes the selected record of the table and initializes the class
* @return true Returns @b true if no error occurred
*/
public function delete()
{
if(strlen($this->dbColumns[$this->keyColumnName]) > 0)
{
$sql = 'DELETE FROM '.$this->tableName.'
WHERE '.$this->keyColumnName.' = \''. $this->dbColumns[$this->keyColumnName]. '\'';
$this->db->query($sql);
}
$this->clear();
return true;
}
/**
* Get the value of a column of the database table.
* If the value was manipulated before with @b setValue than the manipulated value is returned.
* @param string $columnName The name of the database column whose value should be read
* @param string $format For date or timestamp columns the format should be the date/time format e.g. @b d.m.Y = '02.04.2011'. @n
* For text columns the format can be @b database that would return the original database value without any transformations
* @return mixed Returns the value of the database column.
* If the value was manipulated before with @b setValue than the manipulated value is returned.
* @see TableAccess#setValue
*/
public function getValue($columnName, $format = '')
{
global $gPreferences;
$columnValue = '';
if(array_key_exists((string) $columnName, $this->dbColumns))
{
// wenn Schluesselfeld leer ist, dann 0 zurueckgeben
if($columnName === $this->keyColumnName && empty($this->dbColumns[$columnName]))
{
$columnValue = 0;
}
else
{
$columnValue = $this->dbColumns[$columnName];
}
}
// if text field and format not 'database' then convert all quotes to html syntax
if(array_key_exists((string) $columnName, $this->columnsInfos) && array_key_exists('type', $this->columnsInfos[$columnName]))
{
if($format !== 'database'
&& (strpos($this->columnsInfos[$columnName]['type'], 'char') !== false
|| strpos($this->columnsInfos[$columnName]['type'], 'text') !== false))
{
return htmlspecialchars($columnValue, ENT_QUOTES);
}
// in PostgreSQL we must encode the stored hex value back to binary
elseif(strpos($this->columnsInfos[$columnName]['type'], 'bytea') !== false)
{
$columnValue = substr($columnValue, 2);
$columnValue = pack('H*', $columnValue);
return pack('H*', $columnValue);
} // Datum in dem uebergebenen Format bzw. Systemformat zurueckgeben
elseif(strpos($this->columnsInfos[$columnName]['type'], 'timestamp') !== false
|| strpos($this->columnsInfos[$columnName]['type'], 'date') !== false
|| strpos($this->columnsInfos[$columnName]['type'], 'time') !== false)
{
if(strlen($columnValue) > 0)
{
if($format === '' && isset($gPreferences))
{
if(strpos($this->columnsInfos[$columnName]['type'], 'timestamp') !== false)
{
$format = $gPreferences['system_date'].' '.$gPreferences['system_time'];
}
elseif(strpos($this->columnsInfos[$columnName]['type'], 'date') !== false)
{
$format = $gPreferences['system_date'];
}
else
{
$format = $gPreferences['system_time'];
}
}
// probieren das Datum zu formatieren, ansonsten Ausgabe der vorhandenen Daten
try
{
$datetime = new DateTime($columnValue);
$columnValue = $datetime->format($format);
}
catch(Exception $e)
{
$columnValue = $this->dbColumns[$columnName];
}
}
return $columnValue;
}
return $columnValue;
}
return $columnValue;
}
/**
* If a column of the row in this object has changed throw setValue then this method
* will return @b true otherwise @false
* @return bool Returns @b true if at least one value of one column has changed
* after the recordset was loaded otherwise @b false
*/
public function hasColumnsValueChanged()
{
return $this->columnsValueChanged;
}
/**
* If the recordset is new and wasn't read from database or was not stored in database
* then this method will return true otherwise false
* @return bool Returns @b true if record is not stored in database
*/
public function isNewRecord()
{
return $this->new_record;
}
/**
* Reads a record out of the table in database selected by the conditions of the param @b $sqlWhereCondition out of the table.
* If the sql will find more than one record the method returns @b false.
* Per default all columns of the default table will be read and stored in the object.
* @param string $sqlWhereCondition Conditions for the table to select one record
* @return bool Returns @b true if one record is found
* @see TableAccess#readDataById
* @see TableAccess#readDataByColumns
*/
protected function readData($sqlWhereCondition)
{
$sqlAdditionalTables = '';
// create sql to connect additional tables to the select statement
if(count($this->additionalTables) > 0)
{
foreach($this->additionalTables as $key => $arrAdditionalTable)
{
$sqlAdditionalTables .= ', '.$arrAdditionalTable['table'];
$sqlWhereCondition .= ' AND '.$arrAdditionalTable['columnNameAdditionalTable'].' = '.$arrAdditionalTable['columnNameClassTable'].' ';
}
}
// if condition starts with AND then remove this
if(strpos(strtoupper($sqlWhereCondition), 'AND') < 2)
{
$sqlWhereCondition = substr($sqlWhereCondition, 4);
}
if($sqlWhereCondition !== '')
{
$sql = 'SELECT *
FROM '.$this->tableName.$sqlAdditionalTables.'
WHERE '.$sqlWhereCondition;
$readDataStatement = $this->db->query($sql);
if($readDataStatement->rowCount() === 1)
{
$row = $readDataStatement->fetch();
$this->new_record = false;
// Daten in das Klassenarray schieben
foreach($row as $key => $value)
{
if($value === null)
{
$this->dbColumns[$key] = '';
}
else
{
$this->dbColumns[$key] = $value;
}
}
return true;
}
$this->clear();
}
return false;
}
/**
* Reads a record out of the table in database selected by the unique id column in the table.
* Per default all columns of the default table will be read and stored in the object.
* @param int|string $id Unique id of id column of the table.
* @return bool Returns @b true if one record is found
* @see TableAccess#readData
* @see TableAccess#readDataByColumns
*/
public function readDataById($id)
{
// initialize the object, so that all fields are empty
$this->clear();
// add id to sql condition
if($id !== '' && $id != '0')
{
$sqlWhereCondition = ' AND '.$this->keyColumnName.' = \''.$id.'\' ';
// call method to read data out of database
return $this->readData($sqlWhereCondition);
}
return false;
}
/**
* Reads a record out of the table in database selected by different columns in the table.
* The columns are commited with an array where every element index is the column name and the value is the column value.
* The columns and values must be selected so that they identify only one record.
* If the sql will find more than one record the method returns @b false.
* Per default all columns of the default table will be read and stored in the object.
* @param array $columnArray An array where every element index is the column name and the value is the column value
* @return bool Returns @b true if one record is found
* @par Examples
* @code // reads data not be mem_id but with combination of role and user id
* $member = new TableAccess($gDb, TBL_MEMBERS, 'rol');
* $member->readDataByColumn(array('mem_rol_id' => $roleId, 'mem_usr_id' => $userId)); @endcode
* @see TableAccess#readData
* @see TableAccess#readDataById
*/
public function readDataByColumns(array $columnArray)
{
$returnCode = false;
$sqlWhereCondition = '';
// initialize the object, so that all fields are empty
$this->clear();
if(count($columnArray) > 0)
{
// add every array element as a sql condition to the condition string
foreach($columnArray as $columnName => $columnValue)
{
$sqlWhereCondition .= ' AND '.$columnName.' = \''.$columnValue.'\' ';
}
// call method to read data out of database
$returnCode = $this->readData($sqlWhereCondition);
// save the array fields in the object
if(!$returnCode)
{
foreach($columnArray as $columnName => $columnValue)
{
$this->setValue($columnName, $columnValue);
}
}
}
return $returnCode;
}
/**
* Save all changed columns of the recordset in table of database. Therefore the class remembers if it's
* a new record or if only an update is necessary. The update statement will only update the changed columns.
* If the table has columns for creator or editor than these column with their timestamp will be updated.
* @param bool $updateFingerPrint Default @b true. Will update the creator or editor of the recordset
* if table has columns like @b usr_id_create or @b usr_id_changed
* @return bool If an update or insert into the database was done then return true, otherwise false.
*/
public function save($updateFingerPrint = true)
{
if($this->columnsValueChanged || $this->dbColumns[$this->keyColumnName] === '')
{
// SQL-Update-Statement fuer User-Tabelle zusammenbasteln
$item_connection = '';
$sql_field_list = '';
$sql_value_list = '';
if($updateFingerPrint)
{
// besitzt die Tabelle Felder zum Speichern des Erstellers und der letzten Aenderung,
// dann diese hier automatisiert fuellen
if($this->new_record && array_key_exists($this->columnPrefix . '_usr_id_create', $this->dbColumns))
{
global $gCurrentUser;
$this->setValue($this->columnPrefix.'_timestamp_create', DATETIME_NOW);
$this->setValue($this->columnPrefix.'_usr_id_create', $gCurrentUser->getValue('usr_id'));
}
elseif(array_key_exists($this->columnPrefix . '_usr_id_change', $this->dbColumns))
{
global $gCurrentUser;
// Daten nicht aktualisieren, wenn derselbe User dies innerhalb von 15 Minuten gemacht hat
if(time() > (strtotime($this->getValue($this->columnPrefix.'_timestamp_create')) + 900)
|| $gCurrentUser->getValue('usr_id') != $this->getValue($this->columnPrefix.'_usr_id_create'))
{
$this->setValue($this->columnPrefix.'_timestamp_change', DATETIME_NOW);
$this->setValue($this->columnPrefix.'_usr_id_change', $gCurrentUser->getValue('usr_id'));
}
}
}
// Schleife ueber alle DB-Felder und diese dem Update hinzufuegen
foreach($this->dbColumns as $key => $value)
{
// Auto-Increment-Felder duerfen nicht im Insert/Update erscheinen
// Felder anderer Tabellen auch nicht
if(strpos($key, $this->columnPrefix. '_') === 0
&& $this->columnsInfos[$key]['serial'] == 0
&& $this->columnsInfos[$key]['changed'])
{
if($this->new_record)
{
if($value !== '')
{
// Daten fuer ein Insert aufbereiten
$sql_field_list = $sql_field_list. ' '.$item_connection.' '.$key.' ';
// unterscheiden zwischen Numerisch und Text
if(strpos($this->columnsInfos[$key]['type'], 'integer') !== false
|| strpos($this->columnsInfos[$key]['type'], 'smallint') !== false)
{
$sql_value_list = $sql_value_list. ' '.$item_connection.' '.$value.' ';
}
else
{
// Slashs (falls vorhanden) erst einmal entfernen und dann neu Zuordnen,
// damit sie auf jeden Fall da sind
$value = stripslashes($value);
$value = addslashes($value);
$sql_value_list = $sql_value_list. ' '.$item_connection.' \''.$value.'\' ';
}
}
}
else
{
// Daten fuer ein Update aufbereiten
if($value === '' || $value === null)
{
$sql_field_list = $sql_field_list. ' '.$item_connection.' '.$key.' = NULL ';
}
elseif(strpos($this->columnsInfos[$key]['type'], 'integer') !== false
|| strpos($this->columnsInfos[$key]['type'], 'smallint') !== false)
{
// numerisch
$sql_field_list = $sql_field_list. ' '.$item_connection.' '.$key.' = '.$value.' ';
}
else
{
// Slashs (falls vorhanden) erst einmal entfernen und dann neu Zuordnen,
// damit sie auf jeden Fall da sind
$value = stripslashes($value);
$value = addslashes($value);
$sql_field_list = $sql_field_list. ' '.$item_connection.' '.$key.' = \''.$value.'\' ';
}
}
if($item_connection === '' && $sql_field_list !== '')
{
$item_connection = ',';
}
$this->columnsInfos[$key]['changed'] = false;
}
}
if($this->new_record)
{
// insert record and mark this object as not new and remember the new id
$sql = 'INSERT INTO '.$this->tableName.' ('.$sql_field_list.') VALUES ('.$sql_value_list.') ';
$this->db->query($sql);
$this->new_record = false;
if($this->keyColumnName !== '')
{
$this->dbColumns[$this->keyColumnName] = $this->db->lastInsertId();
}
}
else
{
$sql = 'UPDATE '.$this->tableName.' SET '.$sql_field_list.'
WHERE '.$this->keyColumnName.' = \''. $this->dbColumns[$this->keyColumnName]. '\'';
$this->db->query($sql);
}
$this->columnsValueChanged = false;
return true;
}
return false;
}
/**
* The method requires an array with all fields of one recordset of the table object.
* These fields will be add to the object as if you read one record with @b readDataById
* but without a separate SQL. This method is useful if you have several recordsets of the
* table and want to use an table object for each recordset. So you don't have to do an
* separate sql read for each record. This is a performant way to fill the object with
* the necessary data.
* @param array $fieldArray An array with all fields and their values of the table. If the object has
* more connected tables than you should add the fields of these tables, too.
* @par Examples
* @code // read all announcements with their categories
* $sql = 'SELECT * FROM adm_announcements, adm_categories WHERE ann_cat_id = cat_id';
* $announcementsStatement = $gDb->query($sql);
* $announcement = new TableAnnouncements($gDb);
*
* while ($row = $announcementsStatement->fetch())
* {
* // add each recordset to an object without a separate sql within the object
* $announcement->clear();
* $announcement->setArray($row);
* ...
* } @endcode
*/
public function setArray(array $fieldArray)
{
foreach($fieldArray as $field => $value)
{
$this->dbColumns[$field] = $value;
$this->columnsInfos[$field]['changed'] = false;
}
$this->new_record = false;
}
/**
* Set the database object for communication with the database of this class.
* @param \Database $database An object of the class Database. This should be the global $gDb object.
*/
public function setDatabase(&$database)
{
$this->db =& $database;
}
/**
* Set a new value for a column of the database table. The value is only saved in the object.
* You must call the method @b save to store the new value to the database. If the unique key
* column is set to 0 than this record will be a new record and all other columns are marked as changed.
* @param string $columnName The name of the database column whose value should get a new value
* @param mixed $newValue The new value that should be stored in the database field
* @param bool $checkValue The value will be checked if it's valid. If set to @b false than the value will not be checked.
* @return bool Returns @b true if the value is stored in the current object and @b false if a check failed
* @see TableAccess#getValue
*/
public function setValue($columnName, $newValue, $checkValue = true)
{
if(array_key_exists($columnName, $this->dbColumns))
{
// Allgemeine Plausibilitaets-Checks anhand des Feldtyps
if($newValue !== '' && $checkValue)
{
// Numerische Felder
if($this->columnsInfos[$columnName]['type'] === 'integer'
|| $this->columnsInfos[$columnName]['type'] === 'smallint')
{
if(!is_numeric($newValue))
{
$newValue = '';
}
// Schluesselfelder duerfen keine 0 enthalten
if(($this->columnsInfos[$columnName]['key'] == 1 || $this->columnsInfos[$columnName]['null'] == 1)
&& $newValue == 0)
{
$newValue = '';
}
}
// Strings
elseif(strpos($this->columnsInfos[$columnName]['type'], 'char') !== false
|| strpos($this->columnsInfos[$columnName]['type'], 'text') !== false)
{
$newValue = strStripTags($newValue);
}
elseif($this->columnsInfos[$columnName]['type'] === 'blob'
|| $this->columnsInfos[$columnName]['type'] === 'bytea')
{
// PostgreSQL can only store hex values in bytea, so we must decode binary in hex
if($this->columnsInfos[$columnName]['type'] === 'bytea')
{
$newValue = bin2hex($newValue);
}
// we must add slashes to binary data of blob fields so that the default stripslashes don't remove necessary slashes
$newValue = addslashes($newValue);
}
}
// wurde das Schluesselfeld auf 0 gesetzt, dann soll ein neuer Datensatz angelegt werden
if($columnName == $this->keyColumnName && $newValue == 0)
{
$this->new_record = true;
// now mark all other columns with values of this object as changed
foreach($this->dbColumns as $column => $value)
{
if(strlen($value) > 0)
{
$this->columnsInfos[$column]['changed'] = true;
}
}
}
if(array_key_exists($columnName, $this->dbColumns))
{
// only mark as "changed" if the value is different (use binary safe function!)
if(strcmp($newValue, $this->dbColumns[$columnName]) !== 0)
{
$this->dbColumns[$columnName] = $newValue;
$this->columnsValueChanged = true;
$this->columnsInfos[$columnName]['changed'] = true;
}
return true;
}
}
return false;
}
}