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<?php
/*
** $Id$
**
** 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.
**
** it_db.class - Generic Database class, currently using mysql.
**
** This tries to be as efficient as possible by maintaining
** persistent database connections.
*/
/**
* Functions to handle SQL databases
* @see it_db_table, it_db_record
*/
class it_db
{
/* public */
var $host; /* Database host */
var $host_update=''; /* Optional database host for updates */
var $name; /* Name of database */
var $numtables; /* Number of tables in databasee or 0 if not known */
var $tablenames = array(); /* Array(0..$numtables) of table names */
/* private */
var $link; /* MySQL Link Identifier */
var $username; /* MySQL username (if $updatehost) */
var $password; /* MySQL password (if $updatehost) */
/**
* Constructor: connect to MySQL server and select database
* @param $databasename name of the database to select or empty for default
* @param $username username to connect with
* @param $password password to connect with
* @param $host Optional name of the host to connect to
* @param $host_update Optional name of the host for updates (writes)
*/
function it_db($databasename, $username, $password, $host='localhost', $host_update='')
{
if (empty($databasename))
$databasename = strtr(ereg_replace('^www.', '', strtolower(ereg_replace(':.*$', '', getenv('HTTP_HOST')))), '.', '_');
if ($this->link = @mysql_connect($host, $username, $password, true))
{
if (mysql_select_db($databasename, $this->link))
{
$this->host = $host;
$this->name = $databasename;
}
else
it::fatal("Can't select database \"$databasename\" on host \"$host\".");
}
else
it::fatal("Can't connect to database server \"$host\" as user \"$username\".");
if ($host_update)
{
$this->host_update = $host_update;
$this->username = $username;
$this->password = $password;
}
}
/**
* Perform an SQL query.
* @see ::safe_sql_query, mysql_query
* @param $sql SQL query
* @return SQL handle or false in case of failure
*/
function sql_query($sql)
{
debug("it_db::sql_query($sql) on {$this->host}", 5);
/*
** If we have a special update host, and an update operation is to be
** performed, we switch to this host. And we stay forever and ever and ever...
*/
if ($this->host_update && eregi('^(UPDATE|INSERT|REPLACE|DELETE|ALTER) ', $sql))
{
/*debug('it_db::sql_query(): switching to update host "'.$this->host_update.'"', 3); */
if ($this->link = @mysql_connect($this->host_update, $this->username, $this->password, true))
{
if (mysql_select_db($this->name, $this->link))
$this->host = $this->host_update;
else
it::fatal('Error selecting update database "'.$this->name.'" on host "'.$this->host_update.'".');
$this->host_update='';
}
else
it::fatal('Error connecting to update database server "'.$this->host_update.'" as user "'.$this->username.'".');
}
return mysql_query($sql, $this->link);
}
/**
* Perform an SQL query. If the query fails, issue an error message
* and terminate program execution. No matching rows does not mean failure.
* @see ::sql_query, mysql_query
* @param $sql SQL query
* @return SQL handle
*/
function safe_sql_query($sql)
{
/* debug("it_db::safe_sql_query($sql)", 4); */
if ($result = $this->sql_query($sql))
return $result;
else
{
if ($this->errno() == 1062) /* Duplicate entry */
return 0;
fail('SQL-Query db "'.$this->name.'" host "'.$this->host."\" failed: \"$sql\":<br>".$this->error().' ('.$this->errno().')');
}
}
/**
* Free resources used by SQL handle
* @see mysql_free_result
* @param $handle SQL handle
* @return
*/
function free($handle)
{
return mysql_free_result($handle);
}
/**
* Fetch a row as an array
* @see mysql_fetch_array
* @param $handle SQL handle
* @return numeric & associative array with contents of table row
*/
function fetch_array($handle)
{
return mysql_fetch_array($handle);
}
/**
* Fetch a row as an associative array
* @see mysql_fetch_array
* @param $handle SQL handle
* @return associative array with contents of table row
*/
function fetch_assoc($handle)
{
return mysql_fetch_assoc($handle);
}
/**
* Return number of rows of a query
* @see mysql_num_rows
* @param $handle SQL handle
* @return number of rows the query returned
*/
function num_rows($handle)
{
return mysql_num_rows($handle);
}
/**
* Return number of found rows of a limited query that had SQL_COUNT_FOUND_ROWS set
* @return number of rows the query would have returned without LIMIT
*/
function found_rows()
{
list($count) = mysql_fetch_row($this->safe_sql_query('SELECT FOUND_ROWS()'));
return intval($count);
}
/* Internal: get information about tables */
function _get_table_info()
{
if ($this->numtables > 0) /* Already done! */
return;
if(($tables = mysql_list_tables($this->name,$this->link)) >= 0)
{
$this->numtables = mysql_numrows($tables);
for ($i=0; $i < $this->numtables; ++$i)
{
$name = mysql_tablename($tables, $i);
$this->tablenames[$i] = $name;
}
}
else it::fatal("mysql_list_tables($this->name,$this->link) failed.");
}
/**
* Return a list of all table names of this database
* @return array with tablenames of this Database
*/
function table_names()
{
$this->_get_table_info();
return $this->tablenames;
}
/**
* Return number of tables in this database
*/
function num_tables()
{
$this->_get_table_info();
return $this->numtables;
}
/**
* Return last error number
* @see ::sql_query, ::safe_sql_query, mysql_errno
* @return last mySQL error number
*/
function errno()
{
return mysql_errno($this->link);
}
/**
* Return last error string
* @see ::sql_query, ::safe_sql_query, mysql_error
* @return last mySQL error message
*/
function error()
{
return mysql_error($this->link);
}
} /* End class it_db */
?>
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