Query/drivers/mysql/mysql_util.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 - 2014
* @link https://github.com/aviat4ion/Query
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* @license http://philsturgeon.co.uk/code/dbad-license
*/
// --------------------------------------------------------------------------
/**
* MySQL-specific backup, import and creation methods
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*
* @package Query
* @subpackage Drivers
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* @method array get_dbs()
* @method mixed driver_query(string $sql)
* @method array get_system_tables()
* @method array get_tables()
* @method mixed query(string $sql)
* @method string quote(string $str)
*/
class MySQL_Util extends DB_Util {
/**
* Save a reference to the current connection object
*
* @param object $conn
* @return void
*/
public function __construct(&$conn)
{
parent::__construct($conn);
}
// --------------------------------------------------------------------------
/**
* Convienience public function for creating a new MySQL table
*
* @param string $name
* @param array $columns
* @param array $constraints
* @param array $indexes
*
* @return string
*/
public function create_table($name, $columns, array $constraints=array(), array $indexes=array())
{
$column_array = array();
// Reorganize into an array indexed with column information
// Eg $column_array[$colname] = array(
// 'type' => ...,
// 'constraint' => ...,
// 'index' => ...,
// )
foreach($columns as $colname => $type)
{
if(is_numeric($colname))
{
$colname = $type;
}
$column_array[$colname] = array();
$column_array[$colname]['type'] = ($type !== $colname) ? $type : '';
}
if( ! empty($constraints))
{
foreach($constraints as $col => $const)
{
$column_array[$col]['constraint'] = "{$const} ({$col})";
}
}
// Join column definitons together
$columns = array();
foreach($column_array as $n => $props)
{
$n = trim($n, '`');
$str = "`{$n}` ";
$str .= (isset($props['type'])) ? "{$props['type']} " : "";
$columns[] = $str;
}
// Add constraints
foreach($column_array as $n => $props)
{
if (isset($props['constraint']))
{
$columns[] = $props['constraint'];
}
}
// Generate the sql for the creation of the table
$sql = "CREATE TABLE IF NOT EXISTS `{$name}` (";
$sql .= implode(", ", $columns);
$sql .= ")";
return $sql;
}
// --------------------------------------------------------------------------
/**
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* Convience public function for droping a table
*
* @param string $name
* @return string
*/
public function delete_table($name)
{
return "DROP TABLE `{$name}`";
}
// --------------------------------------------------------------------------
/**
* Create an SQL backup file for the current database's structure
*
* @return string
*/
public function backup_structure()
{
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$string = array();
// Get databases
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$dbs = $this->get_dbs();
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foreach($dbs as &$d)
{
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// Skip built-in dbs
if ($d == 'mysql')
{
continue;
}
// Get the list of tables
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$tables = $this->driver_query("SHOW TABLES FROM `{$d}`");
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foreach($tables as &$table)
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{
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$array = $this->driver_query("SHOW CREATE TABLE `{$d}`.`{$table}`", FALSE);
$string[] = $array[0]['Create Table'];
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}
}
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return implode("\n\n", $string);
}
// --------------------------------------------------------------------------
/**
* Create an SQL backup file for the current database's data
*
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* @param array $exclude
* @return string
*/
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public function backup_data($exclude=array())
{
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$tables = $this->get_tables();
// Filter out the tables you don't want
if( ! empty($exclude))
{
$tables = array_diff($tables, $exclude);
}
$output_sql = '';
// Select the rows from each Table
foreach($tables as $t)
{
$sql = "SELECT * FROM `{$t}`";
$res = $this->query($sql);
$rows = $res->fetchAll(PDO::FETCH_ASSOC);
$res = NULL;
// Skip empty tables
if (count($rows) < 1) continue;
// Nab the column names by getting the keys of the first row
$columns = @array_keys($rows[0]);
$insert_rows = array();
// Create the insert statements
foreach($rows as $row)
{
$row = array_values($row);
// Workaround for Quercus
foreach($row as &$r)
{
$r = $this->quote($r);
}
$row = array_map('trim', $row);
$row_string = 'INSERT INTO `'.trim($t).'` (`'.implode('`,`', $columns).'`) VALUES ('.implode(',', $row).');';
$row = NULL;
$insert_rows[] = $row_string;
}
$obj_res = NULL;
$output_sql .= "\n\n".implode("\n", $insert_rows)."\n";
}
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return $output_sql;
}
}
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// End of mysql_util.php