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//usr/share/pear/DB.php
<?php /* vim: set expandtab tabstop=4 shiftwidth=4: */ // +----------------------------------------------------------------------+ // | PHP Version 4 | // +----------------------------------------------------------------------+ // | Copyright (c) 1997-2002 The PHP Group | // +----------------------------------------------------------------------+ // | This source file is subject to version 2.02 of the PHP license, | // | that is bundled with this package in the file LICENSE, and is | // | available at through the world-wide-web at | // | http://www.php.net/license/2_02.txt. | // | If you did not receive a copy of the PHP license and are unable to | // | obtain it through the world-wide-web, please send a note to | // | license@php.net so we can mail you a copy immediately. | // +----------------------------------------------------------------------+ // | Authors: Stig Bakken <ssb@fast.no> | // | Tomas V.V.Cox <cox@idecnet.com> | // +----------------------------------------------------------------------+ // // $Id: DB.php,v 1.13 2002/07/02 15:19:49 cox Exp $ // // Database independent query interface. // require_once "PEAR.php"; /* * The method mapErrorCode in each DB_dbtype implementation maps * native error codes to one of these. * * If you add an error code here, make sure you also add a textual * version of it in DB::errorMessage(). */ define("DB_OK", 1); define("DB_ERROR", -1); define("DB_ERROR_SYNTAX", -2); define("DB_ERROR_CONSTRAINT", -3); define("DB_ERROR_NOT_FOUND", -4); define("DB_ERROR_ALREADY_EXISTS", -5); define("DB_ERROR_UNSUPPORTED", -6); define("DB_ERROR_MISMATCH", -7); define("DB_ERROR_INVALID", -8); define("DB_ERROR_NOT_CAPABLE", -9); define("DB_ERROR_TRUNCATED", -10); define("DB_ERROR_INVALID_NUMBER", -11); define("DB_ERROR_INVALID_DATE", -12); define("DB_ERROR_DIVZERO", -13); define("DB_ERROR_NODBSELECTED", -14); define("DB_ERROR_CANNOT_CREATE", -15); define("DB_ERROR_CANNOT_DELETE", -16); define("DB_ERROR_CANNOT_DROP", -17); define("DB_ERROR_NOSUCHTABLE", -18); define("DB_ERROR_NOSUCHFIELD", -19); define("DB_ERROR_NEED_MORE_DATA", -20); define("DB_ERROR_NOT_LOCKED", -21); define("DB_ERROR_VALUE_COUNT_ON_ROW", -22); define("DB_ERROR_INVALID_DSN", -23); define("DB_ERROR_CONNECT_FAILED", -24); define("DB_ERROR_EXTENSION_NOT_FOUND",-25); define("DB_ERROR_NOSUCHDB", -25); define("DB_ERROR_ACCESS_VIOLATION", -26); /* * Warnings are not detected as errors by DB::isError(), and are not * fatal. You can detect whether an error is in fact a warning with * DB::isWarning(). * * @deprecated */ define('DB_WARNING', -1000); define('DB_WARNING_READ_ONLY', -1001); /* * These constants are used when storing information about prepared * statements (using the "prepare" method in DB_dbtype). * * The prepare/execute model in DB is mostly borrowed from the ODBC * extension, in a query the "?" character means a scalar parameter. * There are two extensions though, a "&" character means an opaque * parameter. An opaque parameter is simply a file name, the real * data are in that file (useful for putting uploaded files into your * database and such). The "!" char means a parameter that must be * left as it is. * They modify the quote behavoir: * DB_PARAM_SCALAR (?) => 'original string quoted' * DB_PARAM_OPAQUE (&) => 'string from file quoted' * DB_PARAM_MISC (!) => original string */ define('DB_PARAM_SCALAR', 1); define('DB_PARAM_OPAQUE', 2); define('DB_PARAM_MISC', 3); /* * These constants define different ways of returning binary data * from queries. Again, this model has been borrowed from the ODBC * extension. * * DB_BINMODE_PASSTHRU sends the data directly through to the browser * when data is fetched from the database. * DB_BINMODE_RETURN lets you return data as usual. * DB_BINMODE_CONVERT returns data as well, only it is converted to * hex format, for example the string "123" would become "313233". */ define('DB_BINMODE_PASSTHRU', 1); define('DB_BINMODE_RETURN', 2); define('DB_BINMODE_CONVERT', 3); /** * This is a special constant that tells DB the user hasn't specified * any particular get mode, so the default should be used. */ define('DB_FETCHMODE_DEFAULT', 0); /** * Column data indexed by numbers, ordered from 0 and up */ define('DB_FETCHMODE_ORDERED', 1); /** * Column data indexed by column names */ define('DB_FETCHMODE_ASSOC', 2); /** * Column data as object properties */ define('DB_FETCHMODE_OBJECT', 3); /** * For multi-dimensional results: normally the first level of arrays * is the row number, and the second level indexed by column number or name. * DB_FETCHMODE_FLIPPED switches this order, so the first level of arrays * is the column name, and the second level the row number. */ define('DB_FETCHMODE_FLIPPED', 4); /* for compatibility */ define('DB_GETMODE_ORDERED', DB_FETCHMODE_ORDERED); define('DB_GETMODE_ASSOC', DB_FETCHMODE_ASSOC); define('DB_GETMODE_FLIPPED', DB_FETCHMODE_FLIPPED); /** * these are constants for the tableInfo-function * they are bitwised or'ed. so if there are more constants to be defined * in the future, adjust DB_TABLEINFO_FULL accordingly */ define('DB_TABLEINFO_ORDER', 1); define('DB_TABLEINFO_ORDERTABLE', 2); define('DB_TABLEINFO_FULL', 3); /* * Used by autoPrepare() */ define('DB_AUTOQUERY_INSERT', 1); define('DB_AUTOQUERY_UPDATE', 2); /** * The main "DB" class is simply a container class with some static * methods for creating DB objects as well as some utility functions * common to all parts of DB. * * The object model of DB is as follows (indentation means inheritance): * * DB The main DB class. This is simply a utility class * with some "static" methods for creating DB objects as * well as common utility functions for other DB classes. * * DB_common The base for each DB implementation. Provides default * | implementations (in OO lingo virtual methods) for * | the actual DB implementations as well as a bunch of * | query utility functions. * | * +-DB_mysql The DB implementation for MySQL. Inherits DB_common. * When calling DB::factory or DB::connect for MySQL * connections, the object returned is an instance of this * class. * * @package DB * @author Stig Bakken <ssb@fast.no> * @since PHP 4.0 */ class DB { /** * Create a new DB connection object for the specified database * type * * @param string $type database type, for example "mysql" * * @return mixed a newly created DB object, or a DB error code on * error * * access public */ function &factory($type) { @include_once("DB/${type}.php"); $classname = "DB_${type}"; if (!class_exists($classname)) { return PEAR::raiseError(null, DB_ERROR_NOT_FOUND, null, null, null, 'DB_Error', true); } @$obj =& new $classname; return $obj; } /** * Create a new DB connection object and connect to the specified * database * * @param mixed $dsn "data source name", see the DB::parseDSN * method for a description of the dsn format. Can also be * specified as an array of the format returned by DB::parseDSN. * * @param mixed $options An associative array of option names and * their values. For backwards compatibility, this parameter may * also be a boolean that tells whether the connection should be * persistent. See DB_common::setOption for more information on * connection options. * * @return mixed a newly created DB connection object, or a DB * error object on error * * @see DB::parseDSN * @see DB::isError * @see DB_common::setOption */ function &connect($dsn, $options = false) { if (is_array($dsn)) { $dsninfo = $dsn; } else { $dsninfo = DB::parseDSN($dsn); } $type = $dsninfo["phptype"]; if (is_array($options) && isset($options["debug"]) && $options["debug"] >= 2) { // expose php errors with sufficient debug level include_once "DB/${type}.php"; } else { @include_once "DB/${type}.php"; } $classname = "DB_${type}"; if (!class_exists($classname)) { return PEAR::raiseError(null, DB_ERROR_NOT_FOUND, null, null, "Unable to include the DB/{$type}.php file for `$dsn'", 'DB_Error', true); } @$obj =& new $classname; if (is_array($options)) { foreach ($options as $option => $value) { $test = $obj->setOption($option, $value); if (DB::isError($test)) { return $test; } } } else { $obj->setOption('persistent', $options); } $err = $obj->connect($dsninfo, $obj->getOption('persistent')); if (DB::isError($err)) { $err->addUserInfo($dsn); return $err; } return $obj; } /** * Return the DB API version * * @return int the DB API version number * * @access public */ function apiVersion() { return 2; } /** * Tell whether a result code from a DB method is an error * * @param int $value result code * * @return bool whether $value is an error * * @access public */ function isError($value) { return (is_object($value) && (get_class($value) == 'db_error' || is_subclass_of($value, 'db_error'))); } /** * Tell whether a value is a DB connection * * @param mixed $value value to test * * @return bool whether $value is a DB connection * * @access public */ function isConnection($value) { return (is_object($value) && is_subclass_of($value, 'db_common') && method_exists($value, 'simpleQuery')); } /** * Tell whether a query is a data manipulation query (insert, * update or delete) or a data definition query (create, drop, * alter, grant, revoke). * * @access public * * @param string $query the query * * @return boolean whether $query is a data manipulation query */ function isManip($query) { $manips = 'INSERT|UPDATE|DELETE|'.'REPLACE|CREATE|DROP|'. 'ALTER|GRANT|REVOKE|'.'LOCK|UNLOCK'; if (preg_match('/^\s*"?('.$manips.')\s+/i', $query)) { return true; } return false; } /** * Return a textual error message for a DB error code * * @param integer $value error code * * @return string error message, or false if the error code was * not recognized */ function errorMessage($value) { static $errorMessages; if (!isset($errorMessages)) { $errorMessages = array( DB_ERROR => 'unknown error', DB_ERROR_ALREADY_EXISTS => 'already exists', DB_ERROR_CANNOT_CREATE => 'can not create', DB_ERROR_CANNOT_DELETE => 'can not delete', DB_ERROR_CANNOT_DROP => 'can not drop', DB_ERROR_CONSTRAINT => 'constraint violation', DB_ERROR_DIVZERO => 'division by zero', DB_ERROR_INVALID => 'invalid', DB_ERROR_INVALID_DATE => 'invalid date or time', DB_ERROR_INVALID_NUMBER => 'invalid number', DB_ERROR_MISMATCH => 'mismatch', DB_ERROR_NODBSELECTED => 'no database selected', DB_ERROR_NOSUCHFIELD => 'no such field', DB_ERROR_NOSUCHTABLE => 'no such table', DB_ERROR_NOT_CAPABLE => 'DB backend not capable', DB_ERROR_NOT_FOUND => 'not found', DB_ERROR_NOT_LOCKED => 'not locked', DB_ERROR_SYNTAX => 'syntax error', DB_ERROR_UNSUPPORTED => 'not supported', DB_ERROR_VALUE_COUNT_ON_ROW => 'value count on row', DB_ERROR_INVALID_DSN => 'invalid DSN', DB_ERROR_CONNECT_FAILED => 'connect failed', DB_OK => 'no error', DB_WARNING => 'unknown warning', DB_WARNING_READ_ONLY => 'read only', DB_ERROR_NEED_MORE_DATA => 'insufficient data supplied', DB_ERROR_EXTENSION_NOT_FOUND=> 'extension not found', DB_ERROR_NOSUCHDB => 'no such database', DB_ERROR_ACCESS_VIOLATION => 'insufficient permissions' ); } if (DB::isError($value)) { $value = $value->getCode(); } return isset($errorMessages[$value]) ? $errorMessages[$value] : $errorMessages[DB_ERROR]; } /** * Parse a data source name * * A array with the following keys will be returned: * phptype: Database backend used in PHP (mysql, odbc etc.) * dbsyntax: Database used with regards to SQL syntax etc. * protocol: Communication protocol to use (tcp, unix etc.) * hostspec: Host specification (hostname[:port]) * database: Database to use on the DBMS server * username: User name for login * password: Password for login * * The format of the supplied DSN is in its fullest form: * * phptype(dbsyntax)://username:password@protocol+hostspec/database * * Most variations are allowed: * * phptype://username:password@protocol+hostspec:110//usr/db_file.db * phptype://username:password@hostspec/database_name * phptype://username:password@hostspec * phptype://username@hostspec * phptype://hostspec/database * phptype://hostspec * phptype(dbsyntax) * phptype * * @param string $dsn Data Source Name to be parsed * * @return array an associative array * * @author Tomas V.V.Cox <cox@idecnet.com> */ function parseDSN($dsn) { if (is_array($dsn)) { return $dsn; } $parsed = array( 'phptype' => false, 'dbsyntax' => false, 'username' => false, 'password' => false, 'protocol' => false, 'hostspec' => false, 'port' => false, 'socket' => false, 'database' => false ); // Find phptype and dbsyntax if (($pos = strpos($dsn, '://')) !== false) { $str = substr($dsn, 0, $pos); $dsn = substr($dsn, $pos + 3); } else { $str = $dsn; $dsn = NULL; } // Get phptype and dbsyntax // $str => phptype(dbsyntax) if (preg_match('|^(.+?)\((.*?)\)$|', $str, $arr)) { $parsed['phptype'] = $arr[1]; $parsed['dbsyntax'] = (empty($arr[2])) ? $arr[1] : $arr[2]; } else { $parsed['phptype'] = $str; $parsed['dbsyntax'] = $str; } if (empty($dsn)) { return $parsed; } // Get (if found): username and password // $dsn => username:password@protocol+hostspec/database if (($at = strrpos($dsn,'@')) !== false) { $str = substr($dsn, 0, $at); $dsn = substr($dsn, $at + 1); if (($pos = strpos($str, ':')) !== false) { $parsed['username'] = urldecode(substr($str, 0, $pos)); $parsed['password'] = urldecode(substr($str, $pos + 1)); } else { $parsed['username'] = urldecode($str); } } // Find protocol and hostspec // $dsn => proto(proto_opts)/database if (preg_match('|^([^(]+)\((.*?)\)/?(.*?)$|', $dsn, $match)) { $proto = $match[1]; $proto_opts = (!empty($match[2])) ? $match[2] : false; $dsn = $match[3]; // $dsn => protocol+hostspec/database (old format) } else { if (strpos($dsn, '+') !== false) { list($proto, $dsn) = explode('+', $dsn, 2); } if (strpos($dsn, '/') !== false) { list($proto_opts, $dsn) = explode('/', $dsn, 2); } else { $proto_opts = $dsn; $dsn = null; } } // process the different protocol options $parsed['protocol'] = (!empty($proto)) ? $proto : 'tcp'; $proto_opts = urldecode($proto_opts); if ($parsed['protocol'] == 'tcp') { if (strpos($proto_opts, ':') !== false) { list($parsed['hostspec'], $parsed['port']) = explode(':', $proto_opts); } else { $parsed['hostspec'] = $proto_opts; } } elseif ($parsed['protocol'] == 'unix') { $parsed['socket'] = $proto_opts; } // Get dabase if any // $dsn => database if (!empty($dsn)) { // /database if (($pos = strpos($dsn, '?')) === false) { $parsed['database'] = $dsn; // /database?param1=value1¶m2=value2 } else { $parsed['database'] = substr($dsn, 0, $pos); $dsn = substr($dsn, $pos + 1); if (strpos($dsn, '&') !== false) { $opts = explode('&', $dsn); } else { // database?param1=value1 $opts = array($dsn); } foreach ($opts as $opt) { list($key, $value) = explode('=', $opt); if (!isset($parsed[$key])) { // don't allow params overwrite $parsed[$key] = urldecode($value); } } } } return $parsed; } /** * Load a PHP database extension if it is not loaded already. * * @access public * * @param string $name the base name of the extension (without the .so or * .dll suffix) * * @return boolean true if the extension was already or successfully * loaded, false if it could not be loaded */ function assertExtension($name) { if (!extension_loaded($name)) { $dlext = OS_WINDOWS ? '.dll' : '.so'; @dl($name . $dlext); return extension_loaded($name); } return true; } } /** * DB_Error implements a class for reporting portable database error * messages. * * @package DB * @author Stig Bakken <ssb@fast.no> */ class DB_Error extends PEAR_Error { /** * DB_Error constructor. * * @param mixed $code DB error code, or string with error message. * @param integer $mode what "error mode" to operate in * @param integer $level what error level to use for $mode & PEAR_ERROR_TRIGGER * @param mixed $debuginfo additional debug info, such as the last query * * @access public * * @see PEAR_Error */ function DB_Error($code = DB_ERROR, $mode = PEAR_ERROR_RETURN, $level = E_USER_NOTICE, $debuginfo = null) { if (is_int($code)) { $this->PEAR_Error('DB Error: ' . DB::errorMessage($code), $code, $mode, $level, $debuginfo); } else { $this->PEAR_Error("DB Error: $code", DB_ERROR, $mode, $level, $debuginfo); } } } /** * This class implements a wrapper for a DB result set. * A new instance of this class will be returned by the DB implementation * after processing a query that returns data. * * @package DB * @author Stig Bakken <ssb@fast.no> */ class DB_result { var $dbh; var $result; var $row_counter = null; /** * for limit queries, the row to start fetching * @var integer */ var $limit_from = null; /** * for limit queries, the number of rows to fetch * @var integer */ var $limit_count = null; /** * DB_result constructor. * @param resource &$dbh DB object reference * @param resource $result result resource id */ function DB_result(&$dbh, $result, $options = array()) { $this->dbh = &$dbh; $this->result = $result; $this->limit_from = isset($options['limit_from']) ? $options['limit_from'] : null; $this->limit_count = isset($options['limit_count']) ? $options['limit_count'] : null; $this->limit_type = $dbh->features['limit']; $this->autofree = $dbh->options['autofree']; $this->fetchmode = $dbh->fetchmode; $this->fetchmode_object_class = $dbh->fetchmode_object_class; } /** * Fetch and return a row of data (it uses driver->fetchInto for that) * @param int $fetchmode format of fetched row * @param int $rownum the row number to fetch * * @return array a row of data, NULL on no more rows or PEAR_Error on error * * @access public */ function fetchRow($fetchmode = DB_FETCHMODE_DEFAULT, $rownum=null) { if ($fetchmode === DB_FETCHMODE_DEFAULT) { $fetchmode = $this->fetchmode; } if ($fetchmode === DB_FETCHMODE_OBJECT) { $fetchmode = DB_FETCHMODE_ASSOC; $object_class = $this->fetchmode_object_class; } if ($this->limit_from !== null) { if ($this->row_counter === null) { $this->row_counter = $this->limit_from; // Skip rows if ($this->limit_type == false) { $i = 0; while ($i++ < $this->limit_from) { $this->dbh->fetchInto($this->result, $arr, $fetchmode); } } } if ($this->row_counter >= ( $this->limit_from + $this->limit_count)) { return null; } if ($this->limit_type == 'emulate') { $rownum = $this->row_counter; } $this->row_counter++; } $res = $this->dbh->fetchInto($this->result, $arr, $fetchmode, $rownum); if ($res !== DB_OK) { if ($res == null && $this->autofree) { $this->free(); } return $res; } if (isset($object_class)) { // default mode specified in DB_common::fetchmode_object_class property if ($object_class == 'stdClass') { $ret = (object) $arr; } else { $ret =& new $object_class($arr); } return $ret; } return $arr; } /** * Fetch a row of data into an existing variable. * * @param mixed &$arr reference to data containing the row * @param integer $fetchmod format of fetched row * @param integer $rownum the row number to fetch * * @return mixed DB_OK on success, NULL on no more rows or * a DB_Error object on error * * @access public */ function fetchInto(&$arr, $fetchmode = DB_FETCHMODE_DEFAULT, $rownum=null) { if ($fetchmode === DB_FETCHMODE_DEFAULT) { $fetchmode = $this->fetchmode; } if ($fetchmode === DB_FETCHMODE_OBJECT) { $fetchmode = DB_FETCHMODE_ASSOC; $object_class = $this->fetchmode_object_class; } if ($this->limit_from !== null) { if ($this->row_counter === null) { $this->row_counter = $this->limit_from; // Skip rows if ($this->limit_type == false) { $i = 0; while ($i++ < $this->limit_from) { $this->dbh->fetchInto($this->result, $arr, $fetchmode); } } } if ($this->row_counter >= ( $this->limit_from + $this->limit_count)) { return null; } if ($this->limit_type == 'emulate') { $rownum = $this->row_counter; } $this->row_counter++; } $res = $this->dbh->fetchInto($this->result, $arr, $fetchmode, $rownum); if (($res === DB_OK) && isset($object_class)) { // default mode specified in DB_common::fetchmode_object_class property if ($object_class == 'stdClass') { $arr = (object) $arr; } else { $arr = new $object_class($arr); } } elseif ($res == null && $this->autofree) { $this->free(); } return $res; } /** * Get the the number of columns in a result set. * * @return int the number of columns, or a DB error * * @access public */ function numCols() { return $this->dbh->numCols($this->result); } /** * Get the number of rows in a result set. * * @return int the number of rows, or a DB error * * @access public */ function numRows() { return $this->dbh->numRows($this->result); } /** * Get the next result if a batch of queries was executed. * * @return bool true if a new result is available or false if not. * * @access public */ function nextResult() { return $this->dbh->nextResult($this->result); } /** * Frees the resources allocated for this result set. * @return int error code * * @access public */ function free() { $err = $this->dbh->freeResult($this->result); if(DB::isError($err)) { return $err; } $this->result = false; return true; } /** * @deprecated */ function tableInfo($mode = null) { return $this->dbh->tableInfo($this->result, $mode); } /** * returns the actual row number * @return integer */ function getRowCounter() { return $this->row_counter; } } /** * Pear DB Row Object * @see DB_common::setFetchMode() */ class DB_row { /** * constructor * * @param resource row data as array */ function DB_row(&$arr) { for (reset($arr); $key = key($arr); next($arr)) { $this->$key = &$arr[$key]; } } } ?>