<?php
	/**************************************************************************\
	* phpGroupWare API - database support                                      *
	* Copyright (c) 1998-2000 NetUSE AG Boris Erdmann, Kristian Koehntopp      *
	* ------------------------------------------------------------------------ *
	* This is not part of phpGroupWare, but is used by phpGroupWare.           *
	* http://www.phpgroupware.org/                                             *
	* ------------------------------------------------------------------------ *
	* This program is free software; you can redistribute it and/or modify it  *
	* under the terms of the GNU Lesser General Public License as published    *
	* by the Free Software Foundation; either version 2.1 of the License, or   *
	* any later version.                                                       *
	\**************************************************************************/

	/* $Id$ */

	/* db_type setup moved after the class below - milosch */

	/**
	* Database abstraction library
	*
	* This allows phpGroupWare to use multiple database backends
	*
	* @package phpgwapi
	* @subpackage db
	* @abstract
	* @author NetUSE AG Boris Erdmann, Kristian Koehntopp <br> hacked on by phpGW
	* @copyright &copy; 1998-2000 NetUSE AG Boris Erdmann, Kristian Koehntopp <br> 2003 FreeSoftware Foundation
	* @license LGPL
	* @link http://www.sanisoft.com/phplib/manual/DB_sql.php
	*/

	class db_
	{
		/**
		* @var string $Host database host to connect to
		*/
		var $Host     = '';
        
		/**
		* @var string $Database name of database to use
		*/
		var $Database = '';
        
		/**
		* @var string $User name of database user
		*/
		var $User     = '';
        
		/**
		* @var string $Password password for database user
		*/
		var $Password = '';

		/**
		* @var bool $auto_stripslashes automatically remove slashes when returning field values - default False
		*/
		var $auto_stripslashes = False;
        
		/**
		* @var int $Auto_Free automatically free results - 0 no, 1 yes
		*/
		var $Auto_Free     = 0;
        
		/**
		* @var int $Debug enable debuging - 0 no, 1 yes
		*/
		var $Debug         = 0;
        
		/**
		* @var string $Halt_On_Error "yes" (halt with message), "no" (ignore errors quietly), "report" (ignore errror, but spit a warning)
		*/
		var $Halt_On_Error = 'yes';
        
		/**
		* @var string $Seq_Table table for storing sequences ????
		*/
		var $Seq_Table     = 'db_sequence';

		/**
		* @var array $Record current record
		*/
		var $Record   = array();
        
		/**
		* @var int row number for current record
		*/
		var $Row;

		/**
		* @var int $Errno internal rdms error number for last error
		*/
		var $Errno    = 0;
        
		/**
		* @var string descriptive text from last error
		*/
		var $Error    = '';

		//i am not documenting private vars - skwashd :)
        var $xmlrpc = False;
		var $soap   = False;

		/**
		* @param string $query query to be executed (optional)
		*/

		function db_($query = '')
		{
			$this->query($query);
		}

		/**
		* @return int current connection id
		*/
		function link_id()
		{
			return $this->Link_ID;
		}

		/**
		* @return int id of current query
		*/
		function query_id()
		{
			return $this->Query_ID;
		}

		/**
		* Open a connection to a database
		*
		* @param string $Database name of database to use (optional)
		* @param string $Host database host to connect to (optional)
		* @param string $User name of database user (optional)
		* @var string $Password password for database user (optional)
		*/
		function connect($Database = '', $Host = '', $User = '', $Password = '')
		{}

		/**
		* Close a connection to a database - only needed for persistent connections
		*/
		function disconnect()
		{}

		/**
		* Escape strings before sending them to the database
		*
		* @param string $str the string to be escaped
		* @return string escaped sting
		*/
		function db_addslashes($str)
		{
			if (!isset($str) || $str == '')
			{
				return '';
			}

			return addslashes($str);
		}

		/**
		* Convert a unix timestamp to a rdms specific timestamp
		*
		* @param int unix timestamp
		* @return string rdms specific timestamp
		*/
		function to_timestamp($epoch)
		{}

		/**
		* Convert a rdms specific timestamp to a unix timestamp
		*
		* @param string rdms specific timestamp
		* @return int unix timestamp
		*/
		function from_timestamp($timestamp)
		{}

		/**
		* @deprecated
		* @see limit_query()
		*/
		function limit($start)
		{}

		/**
		* Discard the current query result
		*/
		function free()
		{
			@mysql_free_result($this->Query_ID);
			$this->Query_ID = 0;
		}

		/**
		* Execute a query
		*
		* @param string $Query_String the query to be executed
		* @param mixed $line the line method was called from - use __LINE__
		* @param string $file the file method was called from - use __FILE__
		* @return int current query id if sucesful and null if fails
		*/
		function query($Query_String, $line = '', $file = '')
		{}

		/**
		* Execute a query with limited result set
		*
		* @param string $Query_String the query to be executed
		* @param int $offset row to start from
		* @param mixed $line the line method was called from - use __LINE__
		* @param string $file the file method was called from - use __FILE__
		* @param int $num_rows number of rows to return (optional), if unset will use $GLOBALS['phpgw_info']['user']['preferences']['common']['maxmatchs']
		* @return int current query id if sucesful and null if fails
		*/
		function limit_query($Query_String, $offset, $line = '', $file = '', $num_rows = '')
		{}

		
		/**
		* Move to the next row in the results set
		*
		* @return bool was another row found?
		*/
		function next_record()
		{}

		/**
		* Move to position in result set
		*
		* @param int $pos required row (optional), default first row
		* @return int 1 if sucessful or 0 if not found
		*/
		function seek($pos = 0)
		{}

		/**
		* Begin Transaction
		*
		* @return int current transaction id
		*/
		function transaction_begin()
		{
			return True;
		}

		/**
		* Complete the transaction
		*
		* @return bool True if sucessful, False if fails
		*/
		function transaction_commit()
		{
			return True;
		}

		/**
		* Rollback the current transaction
		*
		* @return bool True if sucessful, False if fails
		*/
		function transaction_abort()
		{
			return True;
		}

		/**
		* Find the primary key of the last insertion on the current db connection
		*
		* @param string $table name of table the insert was performed on
		* @param string $field the autoincrement primary key of the table
		* @return int the id, -1 if fails
		*/
		function get_last_insert_id($table, $field)
		{}

		/**
		* Lock a table
		*
		* @param string $table name of table to lock
		* @param string $mode type of lock required (optional), default write
		* @return bool True if sucessful, False if fails
		*/
		function lock($table, $mode='write')
		{}

		/**
		* Unlock a table
		*
		* @return bool True if sucessful, False if fails
		*/
		function unlock()
		{}

		/**
		* Get the number of rows affected by last update
		*
		* @return int number of rows
		*/
		function affected_rows()
		{}

		/**
		* Number of rows in current result set
		*
		* @return int number of rows
		*/
		function num_rows()
		{}

		/**
		* Number of fields in current row
		*
		* @return int number of fields
		*/
		function num_fields()
		{}

		/**
		* short hand for @see num_rows()
		*/
		function nf()
		{
			return $this->num_rows();
		}

		/**
		* short hand for print @see num_rows
		*/
		function np()
		{
			print $this->num_rows();
		}

		/**
		* Return the value of a column
		*
		* @param string/integer $Name name of field or positional index starting from 0
		* @param bool $strip_slashes string escape chars from field(optional), default false
		* @return string the field value
		*/
		function f($Name, $strip_slashes = False)
		{
			if ($strip_slashes || ($this->auto_stripslashes && ! $strip_slashes))
			{
				return stripslashes($this->Record[$Name]);
			}
			else
			{
				return $this->Record[$Name];
			}
		}

		/**
		* Print the value of a field
		*
		* @param string $Name name of field to print
		* @param bool $strip_slashes string escape chars from field(optional), default false
		*/
		function p($Name, $strip_slashes = True)
		{
			print $this->f($Name, $strip_slashes);
		}

		/**
		* Returns a query-result-row as an associative array (no numerical keys !!!)
		*
		* @param bool $do_next_record should next_record() be called or not (default not)
		* @return array/bool the associative array or False if no (more) result-row is availible
		*/
		function row($do_next_record=False)
		{
			if ($do_next_record && !$this->next_record() || !is_array($this->Record))
			{
				return False;
			}
			$result = array();
			foreach($this->Record as $column => $value)
			{
				if (!is_numeric($column))
				{
					$result[$column] = $value;
				}
			}
			return $result;
		}

		/**
		* Get the id for the next sequence - not implemented!
		*
		* @param string $seq_name name of the sequence
		* @return int sequence id
		*/
		function nextid($seq_name)
		{}

		/**
		* Get description of a table
		*
		* @param string $table name of table to describe
		* @param bool $full optional, default False summary information, True full information
		* @return array table meta data
		*/
		function metadata($table='',$full=false)
		{
			/*
			 * Due to compatibility problems with Table we changed the behavior
			 * of metadata();
			 * depending on $full, metadata returns the following values:
			 *
			 * - full is false (default):
			 * $result[]:
			 *   [0]["table"]  table name
			 *   [0]["name"]   field name
			 *   [0]["type"]   field type
			 *   [0]["len"]    field length
			 *   [0]["flags"]  field flags
			 *
			 * - full is true
			 * $result[]:
			 *   ["num_fields"] number of metadata records
			 *   [0]["table"]  table name
			 *   [0]["name"]   field name
			 *   [0]["type"]   field type
			 *   [0]["len"]    field length
			 *   [0]["flags"]  field flags
			 *   ["meta"][field name]  index of field named "field name"
			 *   The last one is used, if you have a field name, but no index.
			 *   Test:  if (isset($result['meta']['myfield'])) { ...
			 */
		}

		/**
		* Error handler
		*
		* @param string $msg error message
		* @param int $line line of calling method/function (optional)
		* @param string $file file of calling method/function (optional)
		*/
		function halt($msg, $line = '', $file = '')
		{}

		/**
		* Get a list of table names in the current database
		*
		* @return array list of the tables
		*/
		function table_names()
		{
		}

		/**
		* Return a list of indexes in current database
		*
		* @return array list of indexes
		*/
		function index_names()
		{
			return array();
		}

		/**
		* Create a new database
		*
		* @param string $adminname name of database administrator user (optional)
		* @param string $adminpasswd password for the database administrator user (optional)
		*/
		function create_database($adminname = '', $adminpasswd = '')
		{}

		/**
		* Implodes an array of column-value pairs for the use in sql-querys.
		* All data is either run through addslashes() or intval().
		*
		* @author RalfBecker<at>outdoor-training.de
		*
		* @param string $glue in most cases this will be either ',' or ' AND ', depending you your query
		* @param array  $array column-value pairs
		* @param boolean $use_key should a "$key=" prefix each value, typicaly set to False for insert querys
		* @param array/boolean $only if set to an array only colums which are set (as data !!!) are written
		*	typicaly used to form a WHERE-clause from the primary keys
		* @param array/boolean $column_definitions this can be set to the column-definitions-array
		*	of your table ($tables_baseline[$table]['fd'] of the setup/tables_current.inc.php file).
		*	If its set, the column-type-data determinates if intval() or addslashes is used.
		*/
		function column_data_implode($glue,$array,$use_key=True,$only=False,$column_definitions=False)
		{
			if (!$column_definitions)
			{
				$column_definitions = $this->column_definitions;
			}
			$pairs = array();
			foreach($array as $key => $data)
			{
				if (!$only || in_array($key,$only))
				{
					$column_type = is_array($column_definitions) ? @$colum_definitions[$key]['type'] : False;
					$values[] = ($use_key ? $key.'=' : '').
						($column_type == 'int' || $colum_type == 'auto' ?
						intval($data) : "'".$this->db_addslashes($data)."'");
				}
			}
			return implode($glue,$values);
		}

		/**
		* Sets the default column-definitions for use with column_data_implode()
		*
		* @author RalfBecker<at>outdoor-training.de
		*
		* @param array/boolean $column_definitions this can be set to the column-definitions-array
		*	of your table ($tables_baseline[$table]['fd'] of the setup/tables_current.inc.php file).
		*	If its set, the column-type-data determinates if intval() or addslashes is used.
		*/
		function set_column_definitions($column_definitions=False)
		{
			$this->column_definitions=$column_definitions;
		}

		/**
		* reads the table-definitions from the app's setup/tables_current.inc.php file
		*
		* @author RalfBecker<at>outdoor-training.de
		*
		* @param string $app name of the app
		* @param bool/string $table if set return only defintions of that table, else return all defintions
		* @return the table-defintions or False if file not found
		*/
		function get_table_definitions($app,$table=False)
		{
			if (!isset($this->table_definitions[$app]))
			{
				$tables_current = PHPGW_INCLUDE_ROOT . "/$app/setup/tables_current.inc.php";

				if (!@file_exists($tables_current))
				{
					return $this->table_definitions[$app] = False;
				}
				include($tables_current);
				$this->table_definitions[$app] = $phpgw_baseline;
			}
			if ($table && (!$this->table_definitions[$app] || !isset($this->table_definitions[$app][$table])))
			{
				return False;
			}
			return $table ? $this->table_definitions[$app][$table] : $this->table_definitions[$app];
		}
	}

	if(empty($GLOBALS['phpgw_info']['server']['db_type']))
	{
		$GLOBALS['phpgw_info']['server']['db_type'] = 'mysql';
	}
	include(PHPGW_API_INC.'/class.db_'.$GLOBALS['phpgw_info']['server']['db_type'].'.inc.php');
?>