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+<?php
+
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Provides an object interface to a table row
+ *
+ * PHP versions 4 and 5
+ *
+ * LICENSE: This source file is subject to version 3.0 of the PHP license
+ * that is available through the world-wide-web at the following URI:
+ * http://www.php.net/license/3_0.txt. If you did not receive a copy of
+ * the PHP License and are unable to obtain it through the web, please
+ * send a note to license@php.net so we can mail you a copy immediately.
+ *
+ * @category Database
+ * @package DB
+ * @author Stig Bakken <stig@php.net>
+ * @copyright 1997-2005 The PHP Group
+ * @license http://www.php.net/license/3_0.txt PHP License 3.0
+ * @version CVS: $Id$
+ * @link http://pear.php.net/package/DB
+ */
+
+/**
+ * Obtain the DB class so it can be extended from
+ */
+require_once 'DB.php';
+
+/**
+ * Provides an object interface to a table row
+ *
+ * It lets you add, delete and change rows using objects rather than SQL
+ * statements.
+ *
+ * @category Database
+ * @package DB
+ * @author Stig Bakken <stig@php.net>
+ * @copyright 1997-2005 The PHP Group
+ * @license http://www.php.net/license/3_0.txt PHP License 3.0
+ * @version Release: @package_version@
+ * @link http://pear.php.net/package/DB
+ */
+class DB_storage extends PEAR
+{
+ // {{{ properties
+
+ /** the name of the table (or view, if the backend database supports
+ updates in views) we hold data from */
+ var $_table = null;
+
+ /** which column(s) in the table contains primary keys, can be a
+ string for single-column primary keys, or an array of strings
+ for multiple-column primary keys */
+ var $_keycolumn = null;
+
+ /** DB connection handle used for all transactions */
+ var $_dbh = null;
+
+ /** an assoc with the names of database fields stored as properties
+ in this object */
+ var $_properties = array();
+
+ /** an assoc with the names of the properties in this object that
+ have been changed since they were fetched from the database */
+ var $_changes = array();
+
+ /** flag that decides if data in this object can be changed.
+ objects that don't have their table's key column in their
+ property lists will be flagged as read-only. */
+ var $_readonly = false;
+
+ /** function or method that implements a validator for fields that
+ are set, this validator function returns true if the field is
+ valid, false if not */
+ var $_validator = null;
+
+ // }}}
+ // {{{ constructor
+
+ /**
+ * Constructor
+ *
+ * @param $table string the name of the database table
+ *
+ * @param $keycolumn mixed string with name of key column, or array of
+ * strings if the table has a primary key of more than one column
+ *
+ * @param $dbh object database connection object
+ *
+ * @param $validator mixed function or method used to validate
+ * each new value, called with three parameters: the name of the
+ * field/column that is changing, a reference to the new value and
+ * a reference to this object
+ *
+ */
+ function DB_storage($table, $keycolumn, &$dbh, $validator = null)
+ {
+ $this->PEAR('DB_Error');
+ $this->_table = $table;
+ $this->_keycolumn = $keycolumn;
+ $this->_dbh = $dbh;
+ $this->_readonly = false;
+ $this->_validator = $validator;
+ }
+
+ // }}}
+ // {{{ _makeWhere()
+
+ /**
+ * Utility method to build a "WHERE" clause to locate ourselves in
+ * the table.
+ *
+ * XXX future improvement: use rowids?
+ *
+ * @access private
+ */
+ function _makeWhere($keyval = null)
+ {
+ if (is_array($this->_keycolumn)) {
+ if ($keyval === null) {
+ for ($i = 0; $i < sizeof($this->_keycolumn); $i++) {
+ $keyval[] = $this->{$this->_keycolumn[$i]};
+ }
+ }
+ $whereclause = '';
+ for ($i = 0; $i < sizeof($this->_keycolumn); $i++) {
+ if ($i > 0) {
+ $whereclause .= ' AND ';
+ }
+ $whereclause .= $this->_keycolumn[$i];
+ if (is_null($keyval[$i])) {
+ // there's not much point in having a NULL key,
+ // but we support it anyway
+ $whereclause .= ' IS NULL';
+ } else {
+ $whereclause .= ' = ' . $this->_dbh->quote($keyval[$i]);
+ }
+ }
+ } else {
+ if ($keyval === null) {
+ $keyval = @$this->{$this->_keycolumn};
+ }
+ $whereclause = $this->_keycolumn;
+ if (is_null($keyval)) {
+ // there's not much point in having a NULL key,
+ // but we support it anyway
+ $whereclause .= ' IS NULL';
+ } else {
+ $whereclause .= ' = ' . $this->_dbh->quote($keyval);
+ }
+ }
+ return $whereclause;
+ }
+
+ // }}}
+ // {{{ setup()
+
+ /**
+ * Method used to initialize a DB_storage object from the
+ * configured table.
+ *
+ * @param $keyval mixed the key[s] of the row to fetch (string or array)
+ *
+ * @return int DB_OK on success, a DB error if not
+ */
+ function setup($keyval)
+ {
+ $whereclause = $this->_makeWhere($keyval);
+ $query = 'SELECT * FROM ' . $this->_table . ' WHERE ' . $whereclause;
+ $sth = $this->_dbh->query($query);
+ if (DB::isError($sth)) {
+ return $sth;
+ }
+ $row = $sth->fetchRow(DB_FETCHMODE_ASSOC);
+ if (DB::isError($row)) {
+ return $row;
+ }
+ if (!$row) {
+ return $this->raiseError(null, DB_ERROR_NOT_FOUND, null, null,
+ $query, null, true);
+ }
+ foreach ($row as $key => $value) {
+ $this->_properties[$key] = true;
+ $this->$key = $value;
+ }
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ insert()
+
+ /**
+ * Create a new (empty) row in the configured table for this
+ * object.
+ */
+ function insert($newpk)
+ {
+ if (is_array($this->_keycolumn)) {
+ $primarykey = $this->_keycolumn;
+ } else {
+ $primarykey = array($this->_keycolumn);
+ }
+ settype($newpk, "array");
+ for ($i = 0; $i < sizeof($primarykey); $i++) {
+ $pkvals[] = $this->_dbh->quote($newpk[$i]);
+ }
+
+ $sth = $this->_dbh->query("INSERT INTO $this->_table (" .
+ implode(",", $primarykey) . ") VALUES(" .
+ implode(",", $pkvals) . ")");
+ if (DB::isError($sth)) {
+ return $sth;
+ }
+ if (sizeof($newpk) == 1) {
+ $newpk = $newpk[0];
+ }
+ $this->setup($newpk);
+ }
+
+ // }}}
+ // {{{ toString()
+
+ /**
+ * Output a simple description of this DB_storage object.
+ * @return string object description
+ */
+ function toString()
+ {
+ $info = strtolower(get_class($this));
+ $info .= " (table=";
+ $info .= $this->_table;
+ $info .= ", keycolumn=";
+ if (is_array($this->_keycolumn)) {
+ $info .= "(" . implode(",", $this->_keycolumn) . ")";
+ } else {
+ $info .= $this->_keycolumn;
+ }
+ $info .= ", dbh=";
+ if (is_object($this->_dbh)) {
+ $info .= $this->_dbh->toString();
+ } else {
+ $info .= "null";
+ }
+ $info .= ")";
+ if (sizeof($this->_properties)) {
+ $info .= " [loaded, key=";
+ $keyname = $this->_keycolumn;
+ if (is_array($keyname)) {
+ $info .= "(";
+ for ($i = 0; $i < sizeof($keyname); $i++) {
+ if ($i > 0) {
+ $info .= ",";
+ }
+ $info .= $this->$keyname[$i];
+ }
+ $info .= ")";
+ } else {
+ $info .= $this->$keyname;
+ }
+ $info .= "]";
+ }
+ if (sizeof($this->_changes)) {
+ $info .= " [modified]";
+ }
+ return $info;
+ }
+
+ // }}}
+ // {{{ dump()
+
+ /**
+ * Dump the contents of this object to "standard output".
+ */
+ function dump()
+ {
+ foreach ($this->_properties as $prop => $foo) {
+ print "$prop = ";
+ print htmlentities($this->$prop);
+ print "<br />\n";
+ }
+ }
+
+ // }}}
+ // {{{ &create()
+
+ /**
+ * Static method used to create new DB storage objects.
+ * @param $data assoc. array where the keys are the names
+ * of properties/columns
+ * @return object a new instance of DB_storage or a subclass of it
+ */
+ function &create($table, &$data)
+ {
+ $classname = strtolower(get_class($this));
+ $obj =& new $classname($table);
+ foreach ($data as $name => $value) {
+ $obj->_properties[$name] = true;
+ $obj->$name = &$value;
+ }
+ return $obj;
+ }
+
+ // }}}
+ // {{{ loadFromQuery()
+
+ /**
+ * Loads data into this object from the given query. If this
+ * object already contains table data, changes will be saved and
+ * the object re-initialized first.
+ *
+ * @param $query SQL query
+ *
+ * @param $params parameter list in case you want to use
+ * prepare/execute mode
+ *
+ * @return int DB_OK on success, DB_WARNING_READ_ONLY if the
+ * returned object is read-only (because the object's specified
+ * key column was not found among the columns returned by $query),
+ * or another DB error code in case of errors.
+ */
+// XXX commented out for now
+/*
+ function loadFromQuery($query, $params = null)
+ {
+ if (sizeof($this->_properties)) {
+ if (sizeof($this->_changes)) {
+ $this->store();
+ $this->_changes = array();
+ }
+ $this->_properties = array();
+ }
+ $rowdata = $this->_dbh->getRow($query, DB_FETCHMODE_ASSOC, $params);
+ if (DB::isError($rowdata)) {
+ return $rowdata;
+ }
+ reset($rowdata);
+ $found_keycolumn = false;
+ while (list($key, $value) = each($rowdata)) {
+ if ($key == $this->_keycolumn) {
+ $found_keycolumn = true;
+ }
+ $this->_properties[$key] = true;
+ $this->$key = &$value;
+ unset($value); // have to unset, or all properties will
+ // refer to the same value
+ }
+ if (!$found_keycolumn) {
+ $this->_readonly = true;
+ return DB_WARNING_READ_ONLY;
+ }
+ return DB_OK;
+ }
+ */
+
+ // }}}
+ // {{{ set()
+
+ /**
+ * Modify an attriute value.
+ */
+ function set($property, $newvalue)
+ {
+ // only change if $property is known and object is not
+ // read-only
+ if ($this->_readonly) {
+ return $this->raiseError(null, DB_WARNING_READ_ONLY, null,
+ null, null, null, true);
+ }
+ if (@isset($this->_properties[$property])) {
+ if (empty($this->_validator)) {
+ $valid = true;
+ } else {
+ $valid = @call_user_func($this->_validator,
+ $this->_table,
+ $property,
+ $newvalue,
+ $this->$property,
+ $this);
+ }
+ if ($valid) {
+ $this->$property = $newvalue;
+ if (empty($this->_changes[$property])) {
+ $this->_changes[$property] = 0;
+ } else {
+ $this->_changes[$property]++;
+ }
+ } else {
+ return $this->raiseError(null, DB_ERROR_INVALID, null,
+ null, "invalid field: $property",
+ null, true);
+ }
+ return true;
+ }
+ return $this->raiseError(null, DB_ERROR_NOSUCHFIELD, null,
+ null, "unknown field: $property",
+ null, true);
+ }
+
+ // }}}
+ // {{{ &get()
+
+ /**
+ * Fetch an attribute value.
+ *
+ * @param string attribute name
+ *
+ * @return attribute contents, or null if the attribute name is
+ * unknown
+ */
+ function &get($property)
+ {
+ // only return if $property is known
+ if (isset($this->_properties[$property])) {
+ return $this->$property;
+ }
+ $tmp = null;
+ return $tmp;
+ }
+
+ // }}}
+ // {{{ _DB_storage()
+
+ /**
+ * Destructor, calls DB_storage::store() if there are changes
+ * that are to be kept.
+ */
+ function _DB_storage()
+ {
+ if (sizeof($this->_changes)) {
+ $this->store();
+ }
+ $this->_properties = array();
+ $this->_changes = array();
+ $this->_table = null;
+ }
+
+ // }}}
+ // {{{ store()
+
+ /**
+ * Stores changes to this object in the database.
+ *
+ * @return DB_OK or a DB error
+ */
+ function store()
+ {
+ foreach ($this->_changes as $name => $foo) {
+ $params[] = &$this->$name;
+ $vars[] = $name . ' = ?';
+ }
+ if ($vars) {
+ $query = 'UPDATE ' . $this->_table . ' SET ' .
+ implode(', ', $vars) . ' WHERE ' .
+ $this->_makeWhere();
+ $stmt = $this->_dbh->prepare($query);
+ $res = $this->_dbh->execute($stmt, $params);
+ if (DB::isError($res)) {
+ return $res;
+ }
+ $this->_changes = array();
+ }
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ remove()
+
+ /**
+ * Remove the row represented by this object from the database.
+ *
+ * @return mixed DB_OK or a DB error
+ */
+ function remove()
+ {
+ if ($this->_readonly) {
+ return $this->raiseError(null, DB_WARNING_READ_ONLY, null,
+ null, null, null, true);
+ }
+ $query = 'DELETE FROM ' . $this->_table .' WHERE '.
+ $this->_makeWhere();
+ $res = $this->_dbh->query($query);
+ if (DB::isError($res)) {
+ return $res;
+ }
+ foreach ($this->_properties as $prop => $foo) {
+ unset($this->$prop);
+ }
+ $this->_properties = array();
+ $this->_changes = array();
+ return DB_OK;
+ }
+
+ // }}}
+}
+
+/*
+ * Local variables:
+ * tab-width: 4
+ * c-basic-offset: 4
+ * End:
+ */
+
+?>
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