299 行
无行尾
7.2 KiB
PHP
299 行
无行尾
7.2 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* Postgre Forge Class
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*
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* @category Database
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/database/
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*/
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class CI_DB_postgre_forge extends CI_DB_forge {
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/**
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* Create database
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*
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* @access private
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* @param string the database name
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* @return bool
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*/
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function _create_database($name)
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{
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return "CREATE DATABASE ".$name;
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}
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// --------------------------------------------------------------------
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/**
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* Drop database
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*
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* @access private
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* @param string the database name
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* @return bool
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*/
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function _drop_database($name)
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{
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return "DROP DATABASE ".$name;
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}
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// --------------------------------------------------------------------
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/**
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* Create Table
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*
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* @access private
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* @param string the table name
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* @param array the fields
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* @param mixed primary key(s)
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* @param mixed key(s)
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* @param boolean should 'IF NOT EXISTS' be added to the SQL
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* @return bool
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*/
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function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
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{
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$sql = 'CREATE TABLE ';
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if ($if_not_exists === TRUE)
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{
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if ($this->db->table_exists($table))
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{
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return "SELECT * FROM $table"; // Needs to return innocous but valid SQL statement
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}
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}
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$sql .= $this->db->_escape_identifiers($table)." (";
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$current_field_count = 0;
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foreach ($fields as $field=>$attributes)
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{
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// Numeric field names aren't allowed in databases, so if the key is
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// numeric, we know it was assigned by PHP and the developer manually
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// entered the field information, so we'll simply add it to the list
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if (is_numeric($field))
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{
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$sql .= "\n\t$attributes";
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}
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else
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{
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$attributes = array_change_key_case($attributes, CASE_UPPER);
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$sql .= "\n\t".$this->db->_protect_identifiers($field);
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$is_unsigned = (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE);
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// Convert datatypes to be PostgreSQL-compatible
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switch (strtoupper($attributes['TYPE']))
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{
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case 'TINYINT':
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$attributes['TYPE'] = 'SMALLINT';
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break;
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case 'SMALLINT':
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$attributes['TYPE'] = ($is_unsigned) ? 'INTEGER' : 'SMALLINT';
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break;
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case 'MEDIUMINT':
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$attributes['TYPE'] = 'INTEGER';
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break;
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case 'INT':
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$attributes['TYPE'] = ($is_unsigned) ? 'BIGINT' : 'INTEGER';
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break;
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case 'BIGINT':
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$attributes['TYPE'] = ($is_unsigned) ? 'NUMERIC' : 'BIGINT';
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break;
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case 'DOUBLE':
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$attributes['TYPE'] = 'DOUBLE PRECISION';
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break;
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case 'DATETIME':
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$attributes['TYPE'] = 'TIMESTAMP';
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break;
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case 'LONGTEXT':
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$attributes['TYPE'] = 'TEXT';
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break;
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case 'BLOB':
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$attributes['TYPE'] = 'BYTEA';
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break;
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}
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// If this is an auto-incrementing primary key, use the serial data type instead
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if (in_array($field, $primary_keys) && array_key_exists('AUTO_INCREMENT', $attributes)
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&& $attributes['AUTO_INCREMENT'] === TRUE)
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{
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$sql .= ' SERIAL';
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}
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else
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{
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$sql .= ' '.$attributes['TYPE'];
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}
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// Modified to prevent constraints with integer data types
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if (array_key_exists('CONSTRAINT', $attributes) && strpos($attributes['TYPE'], 'INT') === false)
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{
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$sql .= '('.$attributes['CONSTRAINT'].')';
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}
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if (array_key_exists('DEFAULT', $attributes))
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{
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$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
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}
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if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)
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{
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$sql .= ' NULL';
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}
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else
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{
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$sql .= ' NOT NULL';
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}
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// Added new attribute to create unqite fields. Also works with MySQL
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if (array_key_exists('UNIQUE', $attributes) && $attributes['UNIQUE'] === TRUE)
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{
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$sql .= ' UNIQUE';
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}
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}
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// don't add a comma on the end of the last field
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if (++$current_field_count < count($fields))
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{
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$sql .= ',';
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}
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}
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if (count($primary_keys) > 0)
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{
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// Something seems to break when passing an array to _protect_identifiers()
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foreach ($primary_keys as $index => $key)
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{
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$primary_keys[$index] = $this->db->_protect_identifiers($key);
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}
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$sql .= ",\n\tPRIMARY KEY (" . implode(', ', $primary_keys) . ")";
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}
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$sql .= "\n);";
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if (is_array($keys) && count($keys) > 0)
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{
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foreach ($keys as $key)
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{
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if (is_array($key))
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{
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$key = $this->db->_protect_identifiers($key);
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}
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else
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{
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$key = array($this->db->_protect_identifiers($key));
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}
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foreach ($key as $field)
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{
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$sql .= "CREATE INDEX " . $table . "_" . str_replace(array('"', "'"), '', $field) . "_index ON $table ($field); ";
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}
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}
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Drop Table
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*
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* @access private
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* @return bool
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*/
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function _drop_table($table)
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{
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return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table)." CASCADE";
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}
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// --------------------------------------------------------------------
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/**
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* Alter table query
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*
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* Generates a platform-specific query so that a table can be altered
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* Called by add_column(), drop_column(), and column_alter(),
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*
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* @access private
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* @param string the ALTER type (ADD, DROP, CHANGE)
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* @param string the column name
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* @param string the table name
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* @param string the column definition
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* @param string the default value
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* @param boolean should 'NOT NULL' be added
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* @param string the field after which we should add the new field
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* @return object
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*/
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function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')
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{
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$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ".$this->db->_protect_identifiers($column_name);
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// DROP has everything it needs now.
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if ($alter_type == 'DROP')
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{
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return $sql;
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}
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$sql .= " $column_definition";
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if ($default_value != '')
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{
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$sql .= " DEFAULT \"$default_value\"";
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}
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if ($null === NULL)
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{
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$sql .= ' NULL';
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}
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else
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{
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$sql .= ' NOT NULL';
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}
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if ($after_field != '')
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{
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$sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Rename a table
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*
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* Generates a platform-specific query so that a table can be renamed
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*
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* @access private
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* @param string the old table name
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* @param string the new table name
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* @return string
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*/
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function _rename_table($table_name, $new_table_name)
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{
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$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
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return $sql;
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}
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}
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/* End of file postgre_forge.php */
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/* Location: ./system/database/drivers/postgre/postgre_forge.php */
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