mirror of
https://github.com/moodle/moodle.git
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543 lines
19 KiB
PHP
543 lines
19 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle 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 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle 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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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Postgresql database class using adodb backend
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*
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* TODO: delete before branching 2.0
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*
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* @package moodlecore
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* @subpackage DML
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* @copyright 2008 Petr Skoda (http://skodak.org)
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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require_once($CFG->libdir.'/dml/moodle_database.php');
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require_once($CFG->libdir.'/dml/adodb_moodle_database.php');
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/**
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* Postgresql database class using adodb backend
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*/
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class postgres7_adodb_moodle_database extends adodb_moodle_database {
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public function connect($dbhost, $dbuser, $dbpass, $dbname, $prefix, array $dboptions=null) {
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if ($prefix == '' and !$this->external) {
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//Enforce prefixes for everybody but mysql
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throw new dml_exception('prefixcannotbeempty', $this->get_dbfamily());
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}
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return parent::connect($dbhost, $dbuser, $dbpass, $dbname, $prefix, $dboptions);
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}
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/**
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* Detects if all needed PHP stuff installed.
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* Do not connect to connect to db if this test fails.
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* @return mixed true if ok, string if something
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*/
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public function driver_installed() {
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if (!extension_loaded('pgsql')) {
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return get_string('pgsqlextensionisnotpresentinphp', 'install');
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}
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return true;
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}
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protected function preconfigure_dbconnection() {
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if (!defined('ADODB_ASSOC_CASE')) {
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define ('ADODB_ASSOC_CASE', 2);
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}
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}
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protected function configure_dbconnection() {
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$this->adodb->SetFetchMode(ADODB_FETCH_ASSOC);
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$sql = "SET NAMES 'utf8'";
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$this->query_start($sql, null, SQL_QUERY_AUX);
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$result = $this->adodb->Execute($sql);
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$this->query_end($result);
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return true;
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}
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/**
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* Returns database family type
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* @return string db family name (mysql, postgres, mssql, oracle, etc.)
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*/
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public function get_dbfamily() {
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return 'postgres';
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}
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/**
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* Returns database type
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* @return string db type mysql, mysqli, postgres7
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*/
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protected function get_dbtype() {
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return 'postgres7';
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}
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/**
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* Returns localised database description
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* Note: can be used before connect()
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* @return string
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*/
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public function get_configuration_hints() {
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return get_string('databasesettingssub_postgres7', 'install');
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}
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/**
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* Returns db related part of config.php
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* @return object
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*/
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public function export_dbconfig() {
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$cfg = new stdClass();
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$cfg->dbtype = $this->get_dbtype();
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$cfg->dblibrary = $this->get_dblibrary();
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if ($this->dbhost == 'localhost' or $this->dbhost == '127.0.0.1') {
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$cfg->dbhost = "user='{$this->dbuser}' password='{$this->dbpass}' dbname='{$this->dbname}'";
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$cfg->dbname = '';
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$cfg->dbuser = '';
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$cfg->dbpass = '';
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} else {
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$cfg->dbhost = $this->dbhost;
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$cfg->dbname = $this->dbname;
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$cfg->dbuser = $this->dbuser;
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$cfg->dbpass = $this->dbpass;
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}
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$cfg->prefix = $this->prefix;
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if ($this->dboptions) {
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$cfg->dboptions = $this->dboptions;
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}
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return $cfg;
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}
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/**
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* Returns supported query parameter types
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* @return bitmask
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*/
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protected function allowed_param_types() {
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return SQL_PARAMS_QM;
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}
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public function get_columns($table, $usecache=true) {
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if ($usecache and isset($this->columns[$table])) {
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return $this->columns[$table];
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}
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$this->query_start("--adodb-MetaColumns", null, SQL_QUERY_AUX);
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$columns = $this->adodb->MetaColumns($this->prefix.$table);
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$this->query_end(true);
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if (!$columns) {
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return array();
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}
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$this->columns[$table] = array();
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foreach ($columns as $column) {
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// colum names must be lowercase
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$column->meta_type = substr($this->adodb->MetaType($column), 0 ,1); // only 1 character
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// Let's fix the wrong meta type retrieved because of default blobSize=100 in AdoDB
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if ($column->type == 'varchar' && $column->meta_type == 'X') {
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$column->meta_type = 'C';
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}
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if ($column->has_default) {
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if ($pos = strpos($column->default_value, '::')) {
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if (strpos($column->default_value, "'") === 0) {
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$column->default_value = substr($column->default_value, 1, $pos-2);
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} else {
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$column->default_value = substr($column->default_value, 0, $pos);
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}
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}
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} else {
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$column->default_value = null;
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}
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$this->columns[$table][$column->name] = new database_column_info($column);
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}
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return $this->columns[$table];
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}
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/**
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* This method will introspect inside DB to detect it it's a UTF-8 DB or no
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* Used from setup.php to set correctly "set names" when the installation
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* process is performed without the initial and beautiful installer
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* @return bool true if db in unicode mode
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*/
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function setup_is_unicodedb() {
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/// Get PostgreSQL server_encoding value
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$sql = "SHOW server_encoding";
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$this->query_start($sql, null, SQL_QUERY_AUX);
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$rs = $this->adodb->Execute($sql);
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$this->query_end($rs);
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if ($rs && !$rs->EOF) {
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$encoding = $rs->fields['server_encoding'];
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if (strtoupper($encoding) == 'UNICODE' || strtoupper($encoding) == 'UTF8') {
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return true;
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}
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}
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return false;
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}
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/**
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* Insert new record into database, as fast as possible, no safety checks, lobs not supported.
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* (overloaded from adodb_moodle_database because of sequence numbers
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* @param string $table name
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* @param mixed $params data record as object or array
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* @param bool $returnit return it of inserted record
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* @param bool $bulk true means repeated inserts expected
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* @param bool $customsequence true if 'id' included in $params, disables $returnid
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* @return true or new id
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* @throws dml_exception if error
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*/
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public function insert_record_raw($table, $params, $returnid=true, $bulk=false, $customsequence=false) {
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if (!is_array($params)) {
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$params = (array)$params;
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}
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if ($customsequence) {
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if (!isset($params['id'])) {
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throw new coding_exception('moodle_database::insert_record_raw() id field must be specified if custom sequences used.');
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}
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$returnid = false;
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} else {
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unset($params['id']);
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/// Postgres doesn't have the concept of primary key built in
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/// and will return the OID which isn't what we want.
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/// The efficient and transaction-safe strategy is to
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/// move the sequence forward first, and make the insert
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/// with an explicit id.
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if ($returnid) {
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$seqname = "{$this->prefix}{$table}_id_seq";
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$this->query_start('--adodb-GenID', null, SQL_QUERY_AUX);
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$nextval = $this->adodb->GenID($seqname);
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$this->query_end(true);
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if ($nextval) {
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$params['id'] = (int)$nextval;
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}
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}
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}
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if (empty($params)) {
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throw new coding_exception('moodle_database::insert_record_raw() no fields found.');
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}
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$fields = implode(',', array_keys($params));
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$qms = array_fill(0, count($params), '?');
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$qms = implode(',', $qms);
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$sql = "INSERT INTO {$this->prefix}$table ($fields) VALUES($qms)";
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$this->query_start($sql, $params, SQL_QUERY_INSERT);
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$rs = $this->adodb->Execute($sql, $params);
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$this->query_end($rs);
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if (!$returnid) {
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return true;
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}
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if (!empty($params['id'])) {
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return (int)$params['id'];
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}
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$oid = $this->adodb->Insert_ID();
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// try to get the primary key based on id
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$sql = "SELECT id FROM {$this->prefix}$table WHERE oid = $oid";
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$this->query_start($sql, $params, SQL_QUERY_AUX);
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$rs = $this->adodb->Execute($sql, $params);
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$this->query_end($rs);
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if ( $rs && ($rs->RecordCount() == 1) ) {
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trigger_error("Retrieved id using oid on table $table because we could not find the sequence.");
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return (integer)reset($rs->fields);
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}
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throw new dml_write_exception('unknown error fetching inserted id');
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}
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/**
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* Insert a record into a table and return the "id" field if required,
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* Some conversions and safety checks are carried out. Lobs are supported.
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* If the return ID isn't required, then this just reports success as true/false.
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* $data is an object containing needed data
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* @param string $table The database table to be inserted into
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* @param object $data A data object with values for one or more fields in the record
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* @param bool $returnid Should the id of the newly created record entry be returned? If this option is not requested then true/false is returned.
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* @param bool $bulk true means repeated inserts expected
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* @return true or new id
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* @throws dml_exception if error
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*/
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public function insert_record($table, $dataobject, $returnid=true, $bulk=false) {
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//TODO: add support for blobs BYTEA
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if (!is_object($dataobject)) {
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$dataobject = (object)$dataobject;
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}
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$columns = $this->get_columns($table);
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unset($dataobject->id);
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$cleaned = array();
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$blobs = array();
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foreach ($dataobject as $field=>$value) {
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if (!isset($columns[$field])) {
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continue;
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}
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$column = $columns[$field];
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if ($column->meta_type == 'B') {
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if (is_null($value)) {
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$cleaned[$field] = null;
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} else {
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$blobs[$field] = $value;
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$cleaned[$field] = '@#BLOB#@';
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}
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continue;
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} else if (is_bool($value)) {
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$value = (int)$value; // prevent false '' problems
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} else if ($value === '') {
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if ($column->meta_type == 'I' or $column->meta_type == 'F' or $column->meta_type == 'N') {
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$value = 0; // prevent '' problems in numeric fields
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}
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}
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$cleaned[$field] = $value;
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}
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if (empty($blobs)) {
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return $this->insert_record_raw($table, $cleaned, $returnid, $bulk);
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}
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$id = $this->insert_record_raw($table, $cleaned, true, $bulk);
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foreach ($blobs as $key=>$value) {
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$this->query_start('--adodb-UpdateBlob', null, SQL_QUERY_UPDATE);
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$result = $this->adodb->UpdateBlob($this->prefix.$table, $key, $value, "id = $id", 'BLOB');// adodb does not use bound parameters for blob updates :-(
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$this->query_end($result);
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}
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return ($returnid ? $id : true);
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}
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/**
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* Update a record in a table
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*
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* $dataobject is an object containing needed data
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* Relies on $dataobject having a variable "id" to
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* specify the record to update
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*
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* @param string $table The database table to be checked against.
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* @param object $dataobject An object with contents equal to fieldname=>fieldvalue. Must have an entry for 'id' to map to the table specified.
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* @param bool true means repeated updates expected
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* @return bool true
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* @throws dml_exception if error
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*/
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public function update_record($table, $dataobject, $bulk=false) {
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//TODO: add support for blobs BYTEA
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if (!is_object($dataobject)) {
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$dataobject = (object)$dataobject;
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}
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$columns = $this->get_columns($table);
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$cleaned = array();
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$blobs = array();
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foreach ($dataobject as $field=>$value) {
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if (!isset($columns[$field])) {
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continue;
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}
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$column = $columns[$field];
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if ($column->meta_type == 'B') {
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if (is_null($value)) {
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$cleaned[$field] = null;
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} else {
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$blobs[$field] = $value;
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$cleaned[$field] = '@#BLOB#@';
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}
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continue;
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} else if (is_bool($value)) {
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$value = (int)$value; // prevent "false" problems
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} else if ($value === '') {
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if ($column->meta_type == 'I' or $column->meta_type == 'F' or $column->meta_type == 'N') {
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$value = 0; // prevent '' problems in numeric fields
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}
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}
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$cleaned[$field] = $value;
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}
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$this->update_record_raw($table, $cleaned, $bulk);
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if (empty($blobs)) {
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return true;
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}
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$id = $dataobject->id;
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foreach ($blobs as $key=>$value) {
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$this->query_start('--adodb-UpdateBlob', null, SQL_QUERY_UPDATE);
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$result = $this->adodb->UpdateBlob($this->prefix.$table, $key, $value, "id = $id", 'BLOB');// adodb does not use bound parameters for blob updates :-(
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$this->query_end($result);
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}
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return true;
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}
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/**
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* Set a single field in every table row where the select statement evaluates to true.
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*
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* @param string $table The database table to be checked against.
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* @param string $newfield the field to set.
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* @param string $newvalue the value to set the field to.
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* @param string $select A fragment of SQL to be used in a where clause in the SQL call.
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* @param array $params array of sql parameters
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* @return bool true
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* @throws dml_exception if error
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*/
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public function set_field_select($table, $newfield, $newvalue, $select, array $params=null) {
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$params = (array)$params;
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list($select, $params, $type) = $this->fix_sql_params($select, $params);
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$columns = $this->get_columns($table);
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$column = $columns[$newfield];
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if ($column->meta_type == 'B') {
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/// update blobs and return
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$select = $this->emulate_bound_params($select, $params); // adodb does not use bound parameters for blob updates :-(
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$this->query_start('--adodb-UpdateBlob', null, SQL_QUERY_UPDATE);
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$result = $this->adodb->UpdateBlob($this->prefix.$table, $newfield, $newvalue, $select, 'BLOB');
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$this->query_end($result);
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return true;
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}
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if ($select) {
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$select = "WHERE $select";
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}
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/// normal field update
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if (is_null($newvalue)) {
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$newfield = "$newfield = NULL";
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} else {
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if (is_bool($newvalue)) {
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$newvalue = (int)$newvalue; // prevent "false" problems
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} else if ($newvalue === '') {
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if ($column->meta_type == 'I' or $column->meta_type == 'F' or $column->meta_type == 'N') {
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$newvalue = 0; // prevent '' problems in numeric fields
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}
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}
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$newfield = "$newfield = ?";
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array_unshift($params, $newvalue); // add as first param
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}
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$sql = "UPDATE {$this->prefix}$table SET $newfield $select";
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$this->query_start($sql, $params, SQL_QUERY_UPDATE);
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$rs = $this->adodb->Execute($sql, $params);
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$this->query_end($rs);
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return true;
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}
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public function sql_ilike() {
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return 'ILIKE';
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}
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public function sql_concat() {
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$args = func_get_args();
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/// PostgreSQL requires at least one char element in the concat, let's add it
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/// here (at the beginning of the array) until ADOdb fixes it
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if (is_array($args)) {
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array_unshift($args , "''");
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}
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return call_user_func_array(array($this->adodb, 'Concat'), $args);
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}
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public function sql_bitxor($int1, $int2) {
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return '(' . $this->sql_bitor($int1, $int2) . ' - ' . $this->sql_bitand($int1, $int2) . ')';
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}
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public function sql_cast_char2int($fieldname, $text=false) {
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return ' CAST(' . $fieldname . ' AS INT) ';
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}
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public function sql_cast_char2real($fieldname, $text=false) {
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return " $fieldname::real ";
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}
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/**
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* Does this driver suppoer regex syntax when searching
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*/
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public function sql_regex_supported() {
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return true;
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}
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/**
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* Return regex positive or negative match sql
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* @param bool $positivematch
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* @return string or empty if not supported
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*/
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public function sql_regex($positivematch=true) {
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return $positivematch ? '~*' : '!~*';
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}
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/**
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* Import a record into a table, id field is required.
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* Basic safety checks only. Lobs are supported.
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* @param string $table name of database table to be inserted into
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* @param mixed $dataobject object or array with fields in the record
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* @return bool true
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* @throws dml_exception if error
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*/
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public function import_record($table, $dataobject) {
|
|
$dataobject = (object)$dataobject;
|
|
|
|
$columns = $this->get_columns($table);
|
|
$cleaned = array();
|
|
$blobs = array();
|
|
|
|
foreach ($dataobject as $field=>$value) {
|
|
if (!isset($columns[$field])) {
|
|
continue;
|
|
}
|
|
$column = $columns[$field];
|
|
if ($column->meta_type == 'B') {
|
|
if (!is_null($value)) {
|
|
$blobs[$field] = $value;
|
|
$cleaned[$field] = '@#BLOB#@';
|
|
continue;
|
|
}
|
|
}
|
|
$cleaned[$field] = $value;
|
|
}
|
|
|
|
$this->insert_record_raw($table, $cleaned, false, true, true);
|
|
|
|
if (empty($blobs)) {
|
|
return true;
|
|
}
|
|
|
|
/// We have BLOBs to postprocess
|
|
|
|
foreach ($blobs as $key=>$value) {
|
|
$this->query_start('--adodb-UpdateBlob', null, SQL_QUERY_UPDATE);
|
|
$result = $this->adodb->UpdateBlob($this->prefix.$table, $key, $value, "id = $id", 'BLOB');
|
|
$this->query_end($result);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
}
|