136 lines
2.9 KiB
PHP
136 lines
2.9 KiB
PHP
<?php
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/**
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* Query
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*
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* Free Query Builder / Database Abstraction Layer
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*
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* @package Query
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* @author Timothy J. Warren
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* @copyright Copyright (c) 2012 - 2014
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* @link https://github.com/aviat4ion/Query
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* @license http://philsturgeon.co.uk/code/dbad-license
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*/
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// --------------------------------------------------------------------------
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/**
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* Abstract class defining database / table creation methods
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*
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* @package Query
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* @subpackage Drivers
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*/
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abstract class DB_Util {
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/**
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* Reference to the current connection object
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*/
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private $conn;
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/**
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* Save a reference to the connection object for later use
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*
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* @param object $conn
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*/
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public function __construct($conn)
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{
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$this->conn = $conn;
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}
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// --------------------------------------------------------------------------
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/**
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* Enable calling driver methods
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*
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* @param string $method
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* @param array $args
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* @return mixed
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*/
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public function __call($method, $args)
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{
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return call_user_func_array(array($this->conn, $method), $args);
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}
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// --------------------------------------------------------------------------
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// ! Abstract Methods
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// --------------------------------------------------------------------------
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/**
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* Convienience public function to generate sql for creating a db table
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*
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* @param string $name
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* @param array $fields
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* @param array $constraints
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* @param array $indexes
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*
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* @return string
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*/
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public function create_table($name, $fields, array $constraints=array(), array $indexes=array())
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{
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$column_array = array();
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// Reorganize into an array indexed with column information
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// Eg $column_array[$colname] = array(
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// 'type' => ...,
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// 'constraint' => ...,
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// 'index' => ...,
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// )
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foreach($fields as $colname => $type)
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{
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$column_array[$colname] = array();
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$column_array[$colname]['type'] = ($type !== $colname) ? $type : '';
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}
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if( ! empty($constraints))
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{
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foreach($constraints as $col => $const)
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{
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$column_array[$col]['constraint'] = $const;
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}
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}
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// Join column definitons together
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$columns = array();
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foreach($column_array as $n => $props)
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{
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$str = '"'.$n.'"';
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$str .= (isset($props['type'])) ? " {$props['type']}" : "";
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$str .= (isset($props['constraint'])) ? " {$props['constraint']}" : "";
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$columns[] = $str;
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}
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// Generate the sql for the creation of the table
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$sql = 'CREATE TABLE "'.$name.'" (';
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$sql .= implode(', ', $columns);
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$sql .= ')';
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return $sql;
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}
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/**
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* Get database-specific sql to drop a table
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*
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* @abstract
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* @param string $name
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* @return string
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*/
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abstract public function delete_table($name);
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/**
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* Return an SQL file with the database table structure
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*
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* @abstract
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* @return string
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*/
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abstract public function backup_structure();
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/**
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* Return an SQL file with the database data as insert statements
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*
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* @abstract
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* @return string
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*/
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abstract public function backup_data();
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}
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// End of db_util.php
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