Query/classes/db_pdo.php

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<?php
/**
* Query
*
* Free Query Builder / Database Abstraction Layer
*
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* @package Query
* @author Timothy J. Warren
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* @copyright Copyright (c) 2012
* @link https://github.com/aviat4ion/Query
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* @license http://philsturgeon.co.uk/code/dbad-license
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*/
// --------------------------------------------------------------------------
/**
* Base Database class
*
* Extends PDO to simplify cross-database issues
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*
* @package Query
* @subpackage Query
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*/
abstract class DB_PDO extends PDO {
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// Reference to the last executed query
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protected $statement;
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// Character to escape identifiers
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protected $escape_char = '"';
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// Reference to sql sub class
public $sql;
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// Reference to util sub class
public $util;
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// Last query executed
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public $last_query;
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// Prefix to apply to table namesa
public $table_prefix = '';
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/**
* PDO constructor wrapper
*
* @param string $dsn
* @param string $username
* @param string $password
* @param array $driver_options
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*/
public function __construct($dsn, $username=NULL, $password=NULL, $driver_options=array())
{
parent::__construct($dsn, $username, $password, $driver_options);
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// Load the sql class for the driver
$class = get_class($this)."_sql";
$this->sql = new $class();
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// Load the util class for the driver
$class = get_class($this)."_util";
$this->util = new $class($this);
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$this->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// Set additional driver options, if they exist
if ( ! empty($driver_options) && is_array($driver_options))
{
foreach($driver_options as $key => $val)
{
$this->setAttribute($key, $val);
}
}
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}
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// --------------------------------------------------------------------------
// ! Concrete functions that can be overridden in child classes
// --------------------------------------------------------------------------
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/**
* Simplifies prepared statements for database queries
*
* @param string $sql
* @param array $data
* @return mixed PDOStatement / FALSE
*/
public function prepare_query($sql, $data)
{
// Prepare the sql
$query = $this->prepare($sql);
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if( ! (is_object($query) || is_resource($query)))
{
$this->get_last_error();
return FALSE;
}
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// Set the statement in the class variable for easy later access
$this->statement =& $query;
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if( ! (is_array($data) || is_object($data)))
{
trigger_error("Invalid data argument");
return FALSE;
}
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// Bind the parameters
foreach($data as $k => $value)
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{
if(is_numeric($k))
{
$k++;
}
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$res = $query->bindValue($k, $value);
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if( ! $res)
{
trigger_error("Parameter not successfully bound");
return FALSE;
}
}
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return $query;
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}
// -------------------------------------------------------------------------
/**
* Create and execute a prepared statement with the provided parameters
*
* @param string $sql
* @param array $params
* @return PDOStatement
*/
public function prepare_execute($sql, $params)
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{
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$this->statement = $this->prepare_query($sql, $params);
$this->statement->execute();
return $this->statement;
}
// -------------------------------------------------------------------------
/**
* Retreives the data from a select query
*
* @param PDOStatement $statement
* @return array
*/
public function get_query_data($statement)
{
$this->statement =& $statement;
// Execute the query
$this->statement->execute();
// Return the data array fetched
return $this->statement->fetchAll(PDO::FETCH_ASSOC);
}
// -------------------------------------------------------------------------
/**
* Returns number of rows affected by an INSERT, UPDATE, DELETE type query
*
* @param PDOStatement $statement
* @return int
*/
public function affected_rows($statement='')
{
if ( ! empty($statement))
{
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$this->statement = $statement;
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}
// Return number of rows affected
return $this->statement->rowCount();
}
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// --------------------------------------------------------------------------
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/**
* Return the last error for the current database connection
*
* @return string
*/
public function get_last_error()
{
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list($i1, $i2, $i3) = $this->errorInfo();
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echo "Error: <pre>{$i1}:{$i2}\n{$i3}</pre>";
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}
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// --------------------------------------------------------------------------
/**
* Quote database table name, and set prefix
*
* @param string $table
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* @return string
*/
public function quote_table($table)
{
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// If there isn't a prefix set, just quote the table name
if (empty($this->table_prefix))
{
return $this->quote_ident($table);
}
// Split indentifier by period, will split into:
// database.schema.table OR
// schema.table OR
// database.table OR
// table
$idents = (array) explode('.', $table);
$segments = count($idents);
// Reference the last item in the split string
$last =& $idents[$segments - 1];
// Quote the last item
$last = $this->_prefix($last);
// Rejoin
$table = implode('.', $idents);
// Finally, quote the table
return $this->quote_ident($table);
}
// --------------------------------------------------------------------------
/**
* Sets the table prefix on the passed string
*
* @param string $str
* @return string
*/
protected function _prefix($str)
{
// Don't prefix an already prefixed table
if (strpos($str, $this->table_prefix) !== FALSE)
{
return $str;
}
return $this->table_prefix.$str;
}
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// --------------------------------------------------------------------------
/**
* Surrounds the string with the databases identifier escape characters
*
* @param mixed $ident
* @return string
*/
public function quote_ident($ident)
{
if (is_array($ident))
{
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return array_map(array($this, __METHOD__), $ident);
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}
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// Handle comma-separated identifiers
if (strpos($ident, ',') !== FALSE)
{
$parts = explode(',', $ident);
$parts = array_map('mb_trim', $parts);
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$parts = array_map(array($this, __METHOD__), $parts);
$ident = implode(',', $parts);
}
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// Split each identifier by the period
$hiers = explode('.', $ident);
$hiers = array_map('mb_trim', $hiers);
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// Return the re-compiled string
return implode('.', array_map(array($this, '_quote'), $hiers));
}
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// --------------------------------------------------------------------------
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/**
* Helper method for quote_ident
*
* @param mixed $str
* @return mixed
*/
protected function _quote($str)
{
// Don't quote numbers
if ( ! is_string($str) && is_numeric($str))
{
return $str;
}
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// Don't add additional quotes
if (strpos($str, $this->escape_char) === 0 || strrpos($str, $this->escape_char) === 0)
{
return $str;
}
return "{$this->escape_char}{$str}{$this->escape_char}";
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}
// -------------------------------------------------------------------------
/**
* Deletes all the rows from a table. Does the same as the truncate
* method if the database does not support 'TRUNCATE';
*
* @param string $table
* @return mixed
*/
public function empty_table($table)
{
$sql = 'DELETE FROM '.$this->quote_ident($table);
return $this->query($sql);
}
// -------------------------------------------------------------------------
/**
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* Return schemas for databases that list them
*
* @return array
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*/
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public function get_schemas()
{
return FALSE;
}
// -------------------------------------------------------------------------
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/**
* Return list of tables for the current database
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*
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* @return array
*/
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public function get_tables()
{
return $this->driver_query($this->sql->table_list());
}
// -------------------------------------------------------------------------
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/**
* Return list of dbs for the current connection, if possible
*
* @return array
*/
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public function get_dbs()
{
return $this->driver_query($this->sql->db_list());
}
// -------------------------------------------------------------------------
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/**
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* Return list of views for the current database
*
* @return array
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*/
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public function get_views()
{
return $this->driver_query($this->sql->view_list());
}
// -------------------------------------------------------------------------
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/**
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* Return list of sequences for the current database, if they exist
*
* @return array
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*/
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public function get_sequences()
{
return $this->driver_query($this->sql->sequence_list());
}
// -------------------------------------------------------------------------
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/**
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* Return list of function for the current database
*
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* @return array
*/
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public function get_functions()
{
return $this->driver_query($this->sql->function_list(), FALSE);
}
// -------------------------------------------------------------------------
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/**
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* Return list of stored procedures for the current database
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*
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* @return array
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*/
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public function get_procedures()
{
return $this->driver_query($this->sql->procedure_list(), FALSE);
}
// -------------------------------------------------------------------------
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/**
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* Return list of triggers for the current database
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*
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* @return array
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*/
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public function get_triggers()
{
return $this->driver_query($this->sql->trigger_list(), FALSE);
}
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// -------------------------------------------------------------------------
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/**
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* Retreives an array of non-user-created tables for
* the connection/database
*
* @return array
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*/
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public function get_system_tables()
{
return $this->driver_query($this->sql->system_table_list());
}
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// --------------------------------------------------------------------------
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/**
* Retrieve column information for the current database table
*
* @param string $table
* @return array
*/
public function get_columns($table)
{
return $this->driver_query($this->sql->column_list($table), FALSE);
}
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// --------------------------------------------------------------------------
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/**
* Retrieve list of data types for the database
*
* @return array
*/
public function get_types()
{
return $this->driver_query($this->sql->type_list(), FALSE);
}
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// -------------------------------------------------------------------------
/**
* Method to simplify retreiving db results for meta-data queries
*
* @param string $sql
* @param bool $filtered_index
* @return mixed
*/
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public function driver_query($sql, $filtered_index=TRUE)
{
// Return if the query doesn't apply to the driver
if ($sql === FALSE)
{
return FALSE;
}
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// Return predefined data
if (is_array($sql))
{
return $sql;
}
$res = $this->query($sql);
$flag = ($filtered_index) ? PDO::FETCH_NUM : PDO::FETCH_ASSOC;
$all = $res->fetchAll($flag);
return ($filtered_index) ? db_filter($all, 0) : $all;
}
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// --------------------------------------------------------------------------
/**
* Return the number of rows returned for a SELECT query
*
* @see http://us3.php.net/manual/en/pdostatement.rowcount.php#87110
* @return int
*/
public function num_rows()
{
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$regex = '/^SELECT\s+(?:ALL\s+|DISTINCT\s+)?(?:.*?)\s+FROM\s+(.*)$/i';
$output = array();
if (preg_match($regex, $this->last_query, $output) > 0)
{
$stmt = $this->query("SELECT COUNT(*) FROM {$output[1]}", PDO::FETCH_NUM);
return $stmt->fetchColumn();
}
return FALSE;
}
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// -------------------------------------------------------------------------
// ! Abstract public functions to implement in child classes
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// -------------------------------------------------------------------------
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/**
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* Empty the passed table
*
* @param string $table
* @return void
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*/
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abstract public function truncate($table);
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/**
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* Connect to a different database
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*
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* @param string $name
* @return void
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*/
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abstract public function switch_db($name);
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}
// End of db_pdo.php