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166 lines
7.4 KiB
PHP
166 lines
7.4 KiB
PHP
<?php // $Id$
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///////////////////////////////////////////////////////////////////////////
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// //
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// NOTICE OF COPYRIGHT //
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// //
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// Moodle - Modular Object-Oriented Dynamic Learning Environment //
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// http://moodle.com //
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// //
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// Copyright (C) 2001-3001 Martin Dougiamas http://dougiamas.com //
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// (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation; either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details: //
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// //
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// http://www.gnu.org/copyleft/gpl.html //
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// //
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///////////////////////////////////////////////////////////////////////////
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/// This class generate SQL code to be used against PostgreSQL
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/// It extends XMLDBgenerator so everything can be
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/// overriden as needed to generate correct SQL.
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class XMLDBpostgres7 extends XMLDBgenerator {
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/// Only set values that are different from the defaults present in XMLDBgenerator
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var $number_type = 'NUMERIC'; // Proper type for NUMBER(x) in this DB
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var $unsigned_allowed = false; // To define in the generator must handle unsigned information
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var $default_for_char = ''; // To define the default to set for NOT NULLs CHARs without default (null=do nothing)
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var $foreign_keys = false; // Does the generator build foreign keys
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var $primary_index = false;// Does the generator need to build one index for primary keys
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var $unique_index = false; // Does the generator need to build one index for unique keys
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var $foreign_index = true; // Does the generator need to build one index for foreign keys
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var $sequence_extra_code = false; //Does the generator need to add extra code to generate the sequence fields
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var $sequence_name = 'BIGSERIAL'; //Particular name for inline sequences in this generator
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var $sequence_only = true; //To avoid to output the rest of the field specs, leaving only the name and the sequence_name variable
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var $enum_inline_code = false; //Does the generator need to add inline code in the column definition
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/**
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* Creates one new XMLDBpostgres7
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*/
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function XMLDBpostgres7() {
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parent::XMLDBgenerator();
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$this->prefix = '';
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$this->reserved_words = $this->getReservedWords();
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}
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/**
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* Given one XMLDB Type, lenght and decimals, returns the DB proper SQL type
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*/
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function getTypeSQL ($xmldb_type, $xmldb_length=null, $xmldb_decimals=null) {
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switch ($xmldb_type) {
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case XMLDB_TYPE_INTEGER: // From http://www.postgresql.org/docs/7.4/interactive/datatype.html
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if (empty($xmldb_length)) {
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$xmldb_length = 10;
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}
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if ($xmldb_length > 9) {
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$dbtype = 'BIGINT';
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} else if ($xmldb_length > 4) {
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$dbtype = 'INTEGER';
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} else {
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$dbtype = 'SMALLINT';
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}
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break;
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case XMLDB_TYPE_NUMBER:
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$dbtype = $this->number_type;
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if (!empty($xmldb_length)) {
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$dbtype .= '(' . $xmldb_length;
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if (!empty($xmldb_decimals)) {
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$dbtype .= ',' . $xmldb_decimals;
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}
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$dbtype .= ')';
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}
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break;
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case XMLDB_TYPE_FLOAT:
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$dbtype = 'DOUBLE PRECISION';
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if (!empty($xmldb_decimals)) {
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if ($xmldb_decimals < 6) {
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$dbtype = 'REAL';
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}
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}
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break;
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case XMLDB_TYPE_CHAR:
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$dbtype = 'VARCHAR';
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if (empty($xmldb_length)) {
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$xmldb_length='255';
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}
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$dbtype .= '(' . $xmldb_length . ')';
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break;
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case XMLDB_TYPE_TEXT:
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$dbtype = 'TEXT';
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break;
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case XMLDB_TYPE_BINARY:
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$dbtype = 'BYTEA';
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break;
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case XMLDB_TYPE_DATETIME:
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$dbtype = 'TIMESTAMP';
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break;
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}
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return $dbtype;
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}
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/**
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* Returns the code needed to create one enum for the xmldb_table and xmldb_field passes
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*/
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function getEnumExtraSQL ($xmldb_table, $xmldb_field) {
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$sql = 'CONSTRAINT ' . $this->getNameForObject($xmldb_table->getName(), $xmldb_field->getName(), 'ck');
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$sql.= ' CHECK (' . $this->getEncQuoted($xmldb_field->getName()) . ' IN (' . implode(', ', $xmldb_field->getEnumValues()) . '))';
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return $sql;
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}
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/**
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* Returns the code (in array) needed to add one comment to the table
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*/
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function getCommentSQL ($xmldb_table) {
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$comment = "COMMENT ON TABLE " . $this->getEncQuoted($this->prefix . $xmldb_table->getName());
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$comment.= " IS '" . substr($xmldb_table->getComment(), 0, 250) . "'";
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return array($comment);
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}
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/**
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* Returns an array of reserved words (lowercase) for this DB
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*/
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function getReservedWords() {
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/// This file contains the reserved words for PostgreSQL databases
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/// http://www.postgresql.org/docs/current/static/sql-keywords-appendix.html
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$reserved_words = array (
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'all', 'analyse', 'analyze', 'and', 'any', 'array', 'as', 'asc',
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'asymmetric', 'authorization', 'between', 'binary', 'both', 'case',
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'cast', 'check', 'collate', 'column', 'constraint', 'create', 'cross',
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'current_date', 'current_role', 'current_time', 'current_timestamp',
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'current_user', 'default', 'deferrable', 'desc', 'distinct', 'do',
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'else', 'end', 'except', 'false', 'for', 'foreign', 'freeze', 'from',
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'full', 'grant', 'group', 'having', 'ilike', 'in', 'initially', 'inner',
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'intersect', 'into', 'is', 'isnull', 'join', 'leading', 'left', 'like',
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'limit', 'localtime', 'localtimestamp', 'natural', 'new', 'not',
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'notnull', 'null', 'off', 'offset', 'old', 'on', 'only', 'or', 'order',
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'outer', 'overlaps', 'placing', 'primary', 'references', 'right', 'select',
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'session_user', 'similar', 'some', 'symmetric', 'table', 'then', 'to',
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'trailing', 'true', 'union', 'unique', 'user', 'using', 'verbose',
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'when', 'where'
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);
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return $reserved_words;
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}
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}
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?>
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