www.gusucode.com > PHP开源客户管理系统 v1.0PHP源码程序 > PHP开源客户管理系统 v1.0/khglxt_A5/khglxt_A5/system/database/drivers/postgre/postgre_forge.php
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc.
* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* Postgre Forge Class
*
* @category Database
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/database/
*/
class CI_DB_postgre_forge extends CI_DB_forge {
/**
* Create database
*
* @access private
* @param string the database name
* @return bool
*/
function _create_database($name)
{
return "CREATE DATABASE ".$name;
}
// --------------------------------------------------------------------
/**
* Drop database
*
* @access private
* @param string the database name
* @return bool
*/
function _drop_database($name)
{
return "DROP DATABASE ".$name;
}
// --------------------------------------------------------------------
/**
* Create Table
*
* @access private
* @param string the table name
* @param array the fields
* @param mixed primary key(s)
* @param mixed key(s)
* @param boolean should 'IF NOT EXISTS' be added to the SQL
* @return bool
*/
function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
{
$sql = 'CREATE TABLE ';
if ($if_not_exists === TRUE)
{
if ($this->db->table_exists($table))
{
return "SELECT * FROM $table"; // Needs to return innocous but valid SQL statement
}
}
$sql .= $this->db->_escape_identifiers($table)." (";
$current_field_count = 0;
foreach ($fields as $field=>$attributes)
{
// Numeric field names aren't allowed in databases, so if the key is
// numeric, we know it was assigned by PHP and the developer manually
// entered the field information, so we'll simply add it to the list
if (is_numeric($field))
{
$sql .= "\n\t$attributes";
}
else
{
$attributes = array_change_key_case($attributes, CASE_UPPER);
$sql .= "\n\t".$this->db->_protect_identifiers($field);
$is_unsigned = (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE);
// Convert datatypes to be PostgreSQL-compatible
switch (strtoupper($attributes['TYPE']))
{
case 'TINYINT':
$attributes['TYPE'] = 'SMALLINT';
break;
case 'SMALLINT':
$attributes['TYPE'] = ($is_unsigned) ? 'INTEGER' : 'SMALLINT';
break;
case 'MEDIUMINT':
$attributes['TYPE'] = 'INTEGER';
break;
case 'INT':
$attributes['TYPE'] = ($is_unsigned) ? 'BIGINT' : 'INTEGER';
break;
case 'BIGINT':
$attributes['TYPE'] = ($is_unsigned) ? 'NUMERIC' : 'BIGINT';
break;
case 'DOUBLE':
$attributes['TYPE'] = 'DOUBLE PRECISION';
break;
case 'DATETIME':
$attributes['TYPE'] = 'TIMESTAMP';
break;
case 'LONGTEXT':
$attributes['TYPE'] = 'TEXT';
break;
case 'BLOB':
$attributes['TYPE'] = 'BYTEA';
break;
}
// If this is an auto-incrementing primary key, use the serial data type instead
if (in_array($field, $primary_keys) && array_key_exists('AUTO_INCREMENT', $attributes)
&& $attributes['AUTO_INCREMENT'] === TRUE)
{
$sql .= ' SERIAL';
}
else
{
$sql .= ' '.$attributes['TYPE'];
}
// Modified to prevent constraints with integer data types
if (array_key_exists('CONSTRAINT', $attributes) && strpos($attributes['TYPE'], 'INT') === false)
{
$sql .= '('.$attributes['CONSTRAINT'].')';
}
if (array_key_exists('DEFAULT', $attributes))
{
$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
}
if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)
{
$sql .= ' NULL';
}
else
{
$sql .= ' NOT NULL';
}
// Added new attribute to create unqite fields. Also works with MySQL
if (array_key_exists('UNIQUE', $attributes) && $attributes['UNIQUE'] === TRUE)
{
$sql .= ' UNIQUE';
}
}
// don't add a comma on the end of the last field
if (++$current_field_count < count($fields))
{
$sql .= ',';
}
}
if (count($primary_keys) > 0)
{
// Something seems to break when passing an array to _protect_identifiers()
foreach ($primary_keys as $index => $key)
{
$primary_keys[$index] = $this->db->_protect_identifiers($key);
}
$sql .= ",\n\tPRIMARY KEY (" . implode(', ', $primary_keys) . ")";
}
$sql .= "\n);";
if (is_array($keys) && count($keys) > 0)
{
foreach ($keys as $key)
{
if (is_array($key))
{
$key = $this->db->_protect_identifiers($key);
}
else
{
$key = array($this->db->_protect_identifiers($key));
}
foreach ($key as $field)
{
$sql .= "CREATE INDEX " . $table . "_" . str_replace(array('"', "'"), '', $field) . "_index ON $table ($field); ";
}
}
}
return $sql;
}
// --------------------------------------------------------------------
/**
* Drop Table
*
* @access private
* @return bool
*/
function _drop_table($table)
{
return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table)." CASCADE";
}
// --------------------------------------------------------------------
/**
* Alter table query
*
* Generates a platform-specific query so that a table can be altered
* Called by add_column(), drop_column(), and column_alter(),
*
* @access private
* @param string the ALTER type (ADD, DROP, CHANGE)
* @param string the column name
* @param string the table name
* @param string the column definition
* @param string the default value
* @param boolean should 'NOT NULL' be added
* @param string the field after which we should add the new field
* @return object
*/
function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')
{
$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ".$this->db->_protect_identifiers($column_name);
// DROP has everything it needs now.
if ($alter_type == 'DROP')
{
return $sql;
}
$sql .= " $column_definition";
if ($default_value != '')
{
$sql .= " DEFAULT \"$default_value\"";
}
if ($null === NULL)
{
$sql .= ' NULL';
}
else
{
$sql .= ' NOT NULL';
}
if ($after_field != '')
{
$sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
}
return $sql;
}
// --------------------------------------------------------------------
/**
* Rename a table
*
* Generates a platform-specific query so that a table can be renamed
*
* @access private
* @param string the old table name
* @param string the new table name
* @return string
*/
function _rename_table($table_name, $new_table_name)
{
$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
return $sql;
}
}
/* End of file postgre_forge.php */
/* Location: ./system/database/drivers/postgre/postgre_forge.php */