Query/drivers/pgsql/pgsql_util.php

170 lines
3.7 KiB
PHP

<?php
/**
* Query
*
* Free Query Builder / Database Abstraction Layer
*
* @author Timothy J. Warren
* @copyright Copyright (c) 2012
* @link https://github.com/aviat4ion/Query
* @license http://philsturgeon.co.uk/code/dbad-license
*/
// --------------------------------------------------------------------------
/**
* Posgres-specific backup, import and creation methods
*/
class PgSQL_Util extends DB_Util {
public function __construct(&$conn)
{
parent::__construct($conn);
}
/**
* Database-specific method to create a new 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;
}
}
// Join column definitons together
$columns = array();
foreach($column_array as $n => $props)
{
$str = "{$n} ";
$str .= (isset($props['type'])) ? "{$props['type']} " : "";
$str .= (isset($props['constraint'])) ? $props['constraint'] : "";
$columns[] = $str;
}
// Generate the sql for the creation of the table
$sql = "CREATE TABLE \"{$name}\" (";
$sql .= implode(", ", $columns);
$sql .= ")";
return $sql;
}
// --------------------------------------------------------------------------
/**
* Database-specific SQL for dropping 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()
{
// @todo Implement Backup function
return '';
}
// --------------------------------------------------------------------------
/**
* Create an SQL backup file for the current database's data
*
* @param array $exclude
* @return string
*/
public function backup_data($exclude=array())
{
$tables = $this->get_tables();
// Filter out the tables you don't want
if( ! empty($exclude))
{
$tables = array_diff($tables, $exclude);
}
$output_sql = '';
// Get the data for each object
foreach($tables as $t)
{
$sql = 'SELECT * FROM "'.trim($t).'"';
$res = $this->query($sql);
$obj_res = $res->fetchAll(PDO::FETCH_ASSOC);
// Don't add to the file if the table is empty
if (count($obj_res) < 1) continue;
$res = NULL;
// Nab the column names by getting the keys of the first row
$columns = @array_keys($obj_res[0]);
$insert_rows = array();
// Create the insert statements
foreach($obj_res as $row)
{
$row = array_values($row);
// Quote values as needed by type
$row = array_map(array(&$this, 'quote'), $row);
$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";
}
return $output_sql;
}
}
// End of pgsql_util.php