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authorUrban Müller2007-07-26 13:02:24 +0000
committerUrban Müller2007-07-26 13:02:24 +0000
commit806a5297e7e99d455b97a4f0acaba2f40f470584 (patch)
treeb9fc43ef227da87d873cf3676c08c49fa0dc1240 /db_record.class
parentc3cba034c8009b65c25dd4ef5f54b18d9c8ee7d4 (diff)
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-<?php
-/*
-** $Id$
-**
-** it_db_record.class - A database record based on it_db_table and it_db
-**
-** ITools - the Internet Tools Library
-**
-** Copyright (C) 1995-2003 by the ITools Authors.
-** This program is free software; you can redistribute it and/or
-** modify it under the terms of either the GNU General Public License
-** or the GNU Lesser General Public License, as published by the Free
-** Software Foundation. See http://www.gnu.org/licenses/ for details.
-*/
-
-/**
- * Functions to handle MySQL records
- * @see it_db, it_db_table
- */
-class it_db_record
-{
- var $table; /* Table object */
- var $handle; /* SQL handle for select() / fetch_next() */
- var $keyfieldname; /* Name of primary key field */
- var $key; /* Key of loaded record or empty if no record is loaded */
- var $data = array(); /* Data fields */
-
-
-/**
- * Initialize internal data (table object and name of key field)
- * @param $table Underlying table object (class it_db_table)
- * @param $keyfieldname Optional name of primary key field, defaults to 'ID'
- */
-function it_db_record(&$table, $keyfieldname='ID')
-{
- $this->table = &$table;
- $this->keyfieldname = $keyfieldname;
-}
-
-
-/**
- * Change active key field
- * @param $keyfieldname Optional name of primary key field, defaults to 'ID'
- */
-function set_key_field($keyfieldname='ID')
-{
- $this->keyfieldname = $keyfieldname;
- $this->key = isset($this->data[$keyfieldname]) ? $this->data[$keyfieldname] : '';
-}
-
-
-/**
- * Select a set of records of this table according to an array of selection
- * and sorting criteria.
- * Use fetch_next() to iterate through the result set<br>
- * Example:<br>
- * $record->select(array('Type' => 'bar', 'Date >=' => '1999-01-01',
- * '-Date <' => 'NOW()', 'User NI' => 'chris'), 'ORDER BY Date');
- *
- * @param $params optional array of fieldname => value tupels.
- * These are ANDed to form a WHERE clause.
- * fieldname can contain an operator (separated by space), the
- * default operator is '='. The special operator 'NI' specifies
- * that the argument must be contained in a comma-separated list.
- *
- * @param $sql Optional SQL addendum added after $params (ORDER BY etc.)
- * @param $fields Optional field list to select (defaults to '*')
- * @return Number of rows that matched this query
- * @see it_db_record::fetch_next, it_db_table::construct_sql_clause
- *
- */
-function select($params='', $sql='', $fields='*')
-{
- $this->handle = $this->table->safe_sql_select($this->table->construct_sql_clause($params, $sql), $fields);
- return $this->table->db->num_rows($this->handle);
-}
-
-
-/**
- * Post-process data after reading a record.
- * This is a stub-function that can be overloaded.
- */
-function _read_post_process()
-{
-}
-
-
-/**
- * Pre-process data before writing a record.
- * This is a stub-function that can be overloaded.
- * @param $tags Reference to update/create tags, can be modified as needed
- */
-function _write_pre_process(&$tags)
-{
-}
-
-
-/**
- * Fetch the next record of a select() query
- * @return true if a record was successfully fetched, false otherwise
- * @see it_db_record::select
- */
-function fetch_next()
-{
- return $this->fetch($this->handle);
-}
-
-
-/**
- * Fetch the next record from an SQL result into this object.
- * If no more records are pending, clear the object's data.
- * @param $sqlresult Result of table::sql_select() or similar
- * @return 1 if a record was successfully fetched, 0 otherwise
- */
-function fetch(&$sqlresult)
-{
- $result = 0;
-
- if ($this->data = $this->table->db->fetch_assoc($sqlresult))
- {
- $this->key = $this->data[$this->keyfieldname];
- $result = 1;
- }
- else
- {
- $this->key = ""; /* "No record is loaded" */
- $this->data = array(); /* Clear local record data */
- }
-
- $this->_read_post_process();
-
- return $result;
-}
-
-
-/**
- * Read a record from table
- * @param $key key field value of the desired row
- * @return 1 on success, 0 otherwise
- */
-function read($key)
-{
- $result = 0;
-
- if ($key != "")
- {
- $result = $this->fetch($this->table->safe_sql_select("WHERE $this->keyfieldname='" . mysql_real_escape_string($key) . "'"));
- }
- else
- {
- $this->key = ""; /* "No record is loaded" */
- $this->data = array(); /* Clear local record data */
- }
-
- $this->_read_post_process();
-
- return $result;
-}
-
-
-/**
- * Create a new record in the table
- * @see it_db_record::record_create, it_db_record::safe_create
- * @param $tags array of Fieldname/Value pairs
- * @param $replace use REPLACE (1) instead of INSERT (otherwise)
- * @return MySQL result (0 means failure)
- */
-function create($tags, $replace=0)
-{
- /* Pre-processing, $tags is passed by reference and may be modified here */
- $this->_write_pre_process($tags);
-
- $sql = $replace ? "REPLACE" : "INSERT";
- $sql .= " INTO " . $this->table->name . " (";
- $sql2 = '';
-
- unset($this->data);
- for ($sep=""; $ti = each($tags); $sep=",")
- {
- /* If the field name starts with '-', the value is taken as raw, no escaping
- is done and no quotes are put around it. */
- if (substr($ti[0], 0, 1) == '-')
- {
- $ti[0] = substr($ti[0], 1); /* Strip that '-' sign */
- $val = $ti[1];
- }
- else
- $val = isset($ti[1]) ? "'".mysql_real_escape_string($ti[1])."'" : 'NULL';
-
- $this->data[$ti[0]] = $ti[1]; /* Store data for later use */
-
- $sql .= $sep . $ti[0];
- $sql2 .= "$sep$val";
- }
-
- $sql .= ") VALUES ($sql2)";
-
- if ($result = $this->table->db->sql_query($sql))
- {
- /* If the key element was not given, it means it's an AUTO_INCREMENT thingy. */
- if (($this->key = $this->data[$this->keyfieldname]) == "")
- {
- $result = $this->table->db->safe_sql_query("SELECT LAST_INSERT_ID()");
- $this->key = mysql_result($result, 0, 0);
- }
-
- /* We need all fields from record, not only those we initialised */
- $this->read($this->key);
- }
-
- return $result;
-}
-
-
-/**
- * Safe version of create (doesn't return in case of failure)
- * @see it_db_record::create, it_db_record::record_create
- * @param $tags array of Fieldname/Value pairs
- * @param $replace use REPLACE (1) instead of INSERT (otherwise)
- * @return MySQL result (0 means failure)
- */
-function safe_create($tags, $replace=0)
-{
- if ($result = $this->create($tags, $replace))
- return $result;
- else
- fail("it_db_record::safe_create() failed: " . $this->table->db->error());
-}
-
-
-/**
- * Update a record in the table
- * @param $tags array of Fieldname/Value pairs
- * @return MySQL result (0 means failure)
- */
-function update($tags)
-{
- /* Pre-processing, $tags is passed by reference and may be modified here */
- $this->_write_pre_process($tags);
-
- if ($this->key == "")
- it::fatal("it_db_record::update(): can't update undefined record");
-
- /* If we have nothing to do, return instead of performing an invalid SQL query */
- if (!count($tags))
- return true;
-
- $sql = "UPDATE " . $this->table->name . " SET ";
-
- for ($sep="", $raw=0; $ti = each($tags); $sep=",")
- {
- /* If the field name starts with '-', the value is taken as raw, no escaping
- is done and no quotes are put around it. */
- if (substr($ti[0], 0, 1) == '-')
- {
- $ti[0] = substr($ti[0], 1); /* Strip that '-' sign */
- $val = $ti[1];
- $raw++;
- }
- else
- $val = "'".mysql_real_escape_string($ti[1])."'";
-
- $sql .= $sep.$ti[0].'='.$val;
-
- if ($ti[0] == $this->key)
- {
- if ($this->data[$this->keyfieldname] != $ti[0])
- it::fatal("$sql: trying to change key from $this->key.");
- }
-
- $this->data[$ti[0]] = $ti[1];
- }
-
- $sql .= " WHERE " . $this->keyfieldname . "='" . mysql_real_escape_string($this->key) . "'";
-
- /* debug("it_db_record::update(): $sql"); */
- $ret = $this->table->db->safe_sql_query($sql);
-
- /* Only re-read record if necessary (for performance), but always do post-processing. */
- if ($raw)
- $this->read($this->key);
- else
- $this->_read_post_process();
-
- return $ret;
-}
-
-
-/**
- * Delete the current record from the database
- * @param $key keyfield value of the record to be deleted. If this is missing, the current record is deleted.
- * @return MySQL result (0 means failure)
- */
-function delete($key="")
-{
- if (!$key) $key = $this->key;
-
- if (($this->table->name == "") || ($this->keyfieldname == "") || ($key == ""))
- it::fatal("it_db_record::delete(): no record\n");
-
- $sql = "DELETE FROM " . $this->table->name . " WHERE ". $this->keyfieldname . "='" . mysql_real_escape_string($key) . "'";
- if ($result = $this->table->db->sql_query($sql))
- {
- $this->key = "";
- $this->data = array();
- }
- return $result;
-}
-
-
-/**
- * Return a field of a record.
- * @param $field field name
- * @return field value. If the field does not exists, issue an
- * error message and terminate program execution.
- */
-function safe_get_field($field)
-{
- if ($field)
- {
- if (isset($this->data[$field]))
- return $this->data[$field];
- else it::fatal("it_db_record::safe_get_field(): field \"$field\" not present in record.");
- }
- else it::fatal("it_db_record::safe_get_field(): empty field name");
-}
-
-
-/**
- * Output all fields of a record in (ugly) html format
- */
-function dump_html()
-{
- echo "<br>Dump of table " . $this->table->name . ", record " . $this->keyfieldname . " = \"" . $this->key . "\":<br><pre>\n";
- reset($this->data); next($this->data);
- while(list($key, $value) = each($this->data))
- {
- if ($key > 0) continue; /* $$$ ugly */
- echo $key . " = \"" . htmlspecialchars($value) . "\"\n";
- }
- echo "</pre><br>\n";
-}
-
-
-/**
- * Edit a record of a table. Create a new record if necessary.<br>
- * Example:<br>
- * $record->edit($id, array('ID' => $id));
- *
- * @param $key key value of the row to edit
- * @param $fixfields Array of fields not editable (with fixed values)
- * @return 1=changed, 2=created, -1=deleted, 0=nothing changed
- */
-function edit($key, $fixfields = array())
-{
- $returnresult = 0;
- $numfields = $this->table->num_fields();
-
- if ($_REQUEST['_COMMAND'])
- {
- /*
- ** If the key field is changed, $key will carry a wrong value, so we
- ** take the correct one from $_RECORD_KEY_VALUE
- */
- $key = $_REQUEST['_RECORD_KEY_VALUE'];
-
- switch($_REQUEST['_COMMAND'])
- {
- case "EDIT":
- $this->read($key);
- $newdata = array();
- $changes = 0;
- for ($i=0; $i < $numfields; ++$i)
- {
- $fieldname = $this->table->fieldnames[$i];
-
- /* Assumes field order is fixed */
- if (isset($fixfields[$fieldname]))
- $newvalue = $fixfields[$fieldname];
- else if (is_array($_REQUEST["_RECORD_$fieldname"]))
- $newvalue = join(',', $_REQUEST["_RECORD_$fieldname"]);
- else
- $newvalue = $_REQUEST["_RECORD_$fieldname"];
-
- if ($this->data[$fieldname] != $newvalue)
- {
- $newdata[$fieldname] = $newvalue;
- $changes = 1;
- }
- }
-
- if ($changes)
- {
- if ($this->update($newdata))
- {
- echo "<b>Änderung erfolgreich durchgef&uuml;hrt.</b><br>\n";
- $returnresult = 1;
- }
- else
- fail("Update failed.");
- }
- else echo "<b>Keine Änderungen.</b><br>\n";
- break;
-
- case "CREATE":
- $newdata = array();
- for ($i=0; $i < $numfields; ++$i)
- {
- $fieldname = $this->table->fieldnames[$i];
-
- if (isset($fixfields[$fieldname]))
- $newvalue = $fixfields[$fieldname];
- else if (is_array($_REQUEST["_RECORD_$fieldname"]))
- $newvalue = join(',', $_REQUEST["_RECORD_$fieldname"]);
- else
- $newvalue = $_REQUEST["_RECORD_$fieldname"];
-
- $newdata[$fieldname] = $newvalue;
- }
-
- if ($this->create($newdata))
- {
- $key = $this->key;
- echo "<b>Datensatz erzeugt.</b><br>\n";
- $returnresult = 2;
- }
- else
- fail("Datensatz konnte nicht erzeugt werden.");
- break;
-
- case "DELETE":
- if ($this->delete($key))
- {
- echo "<b>Datensatz gelöscht.</b><br>\n";
- $returnresult = -1;
- }
- else
- fail("Datensatz konnte nicht gelöscht werden.");
- break;
-
- default:
- fail("Unknown _COMMAND \"{$_REQUEST['_COMMAND']}\"");
- /* NOT REACHED */
- }
- }
-
- if ($key != "")
- {
- $this->read($key);
- $cmd = "EDIT";
- $buttontext = "Änderungen übernehmen";
- }
- else
- {
- $cmd = "CREATE";
- $buttontext = "Datensatz erzeugen";
- }
-
- echo "<form action=\"\" method=\"post\"><input type=\"hidden\" name=\"_COMMAND\" value=\"$cmd\"><input type=\"hidden\" name=\"_RECORD_KEY_NAME\" value=\"$this->keyfieldname\"><input type=\"hidden\" name=\"_RECORD_KEY_VALUE\" value=\"$this->key\">\n";
- echo "<table border=1 cellspacing=0 cellpadding=4>\n";
- for ($i=0; $i < $numfields; ++$i)
- {
- $fieldname = $this->table->fieldnames[$i];
-
- /* Do not display fix fields */
- if (isset($fixfields[$fieldname]))
- continue;
-
- $fieldflags = $this->table->fieldflags[$i];
- $fieldlen = $this->table->fieldlengths[$i];
- $size = min($fieldlen, 65);
-
- if ($fieldname == $this->keyfieldname)
- echo "<tr><th align=right>$fieldname</th>";
- else
- echo "<tr><td align=right>$fieldname</td>";
-
- if (strstr($fieldflags, "blob"))
- {
- if (strlen($this->data["$fieldname"]) < 256)
- echo "<td><textarea name=\"_RECORD_$fieldname\" rows=4 cols=56 wrap=\"physical\">" . htmlspecialchars($this->data["$fieldname"]) . "</textarea></td></tr>\n";
- else
- echo "<td><textarea name=\"_RECORD_$fieldname\" rows=10 cols=75 wrap=\"physical\">" . htmlspecialchars($this->data["$fieldname"]) . "</textarea></td></tr>\n";
- }
- else if (strstr($fieldflags, "enum"))
- {
- $result = $this->table->db->safe_sql_query("SHOW columns FROM ". $this->table->name . " LIKE '$fieldname'");
- $options = split("'", mysql_result($result, 0, 1));
-
- $vals = explode(',', $this->data[$fieldname]);
-
- for ($j = 0; $j < count($vals); $j++)
- $values[$vals[$j]] = 1;
-
- if (strstr($options[0], 'set'))
- $attr = 'multiple';
- else
- $attr = 'set="1"';
-
- echo "<td><select name=\"_RECORD_${fieldname}[]\" $attr>";
- for ($j=1; $options[$j]; $j+=2)
- {
- $selected = $values[$options[$j]] ? " selected" : "";
- echo "<option$selected>", $options[$j], "</option>";
- }
- echo "</select></td></tr>\n";
- }
- else
- echo "<td><input type=\"text\" size=$size name=\"_RECORD_$fieldname\" maxlength=\"$fieldlen\" value=\"" . htmlspecialchars($this->data["$fieldname"]) . "\"></td></tr>\n";
- }
- echo "</table><br><input type=\"submit\" value=\"$buttontext\"></form>\n";
-
- if ($this->key != "")
- echo "<form action=\"\" method=\"post\"><input type=\"hidden\" name=\"_COMMAND\" value=\"DELETE\"><input type=\"hidden\" name=\"_RECORD_KEY_NAME\" value=\"$this->keyfieldname\"><input type=\"hidden\" name=\"_RECORD_KEY_VALUE\" value=\"$this->key\"><input type=\"submit\" value=\"Datensatz löschen\"></form>\n";
-
- return $returnresult;
-}
-
-} /* End class it_db_record */
-?>