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<?php
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2004 Manuel Lemos, Tomas V.V.Cox, |
// | Stig. S. Bakken, Lukas Smith |
// | All rights reserved. |
// +----------------------------------------------------------------------+
// | MDB is a merge of PEAR DB and Metabases that provides a unified DB |
// | API as well as database abstraction for PHP applications. |
// | This LICENSE is in the BSD license style. |
// | |
// | Redistribution and use in source and binary forms, with or without |
// | modification, are permitted provided that the following conditions |
// | are met: |
// | |
// | Redistributions of source code must retain the above copyright |
// | notice, this list of conditions and the following disclaimer. |
// | |
// | Redistributions in binary form must reproduce the above copyright |
// | notice, this list of conditions and the following disclaimer in the |
// | documentation and/or other materials provided with the distribution. |
// | |
// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, |
// | Lukas Smith nor the names of his contributors may be used to endorse |
// | or promote products derived from this software without specific prior|
// | written permission. |
// | |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
// | OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
// | POSSIBILITY OF SUCH DAMAGE. |
// +----------------------------------------------------------------------+
// | Author: YOUR NAME <YOUR EMAIL> |
// +----------------------------------------------------------------------+
//
// $Id: skeleton.php,v 1.16.4.2 2004/03/12 16:19:31 lsmith Exp $
//
// This is just a skeleton MDB driver.
// There may be methods missing as this skeleton is based on the methods
// implemented by the MySQL and PostGreSQL drivers in MDB.
// Some methods may not have to be implemented in the driver, because the
// implementation in common.php is compatible with the given RDBMS.
// In each of the listed methods I have added comments that tell you where
// to look for a "reference" implementation.
// Some of these methods have been expanded or changed slightly in MDB.
// Looking in the relevant MDB Wrapper should give you some pointers, some
// other difference you will only discover by looking at one of the existing
// MDB driver or the common implementation in common.php.
// One thing that will definately have to be modified in all "reference"
// implementations of Metabase methods is the error handling.
// Anyways don't worry if you are having problems: Lukas Smith is here to help!
require_once('MDB/Common.php');
/**
* MDB XXX driver
*
* @package MDB
* @category Database
* @author YOUR NAME <YOUR EMAIL>
*/
class MDB_xxx extends MDB_Common
{
// Most of the class variables are taken from the corresponding Metabase driver.
// Few are taken from the corresponding PEAR DB driver.
// Some are MDB specific.
var $connection = 0;
var $connected_host;
var $connected_user;
var $connected_password;
var $connected_port;
var $opened_persistent = '';
var $escape_quotes = "\\";
var $decimal_factor = 1.0;
var $highest_fetched_row = array();
var $columns = array();
// }}}
// {{{ constructor
/**
* Constructor
*/
function MDB_xxx()
{
$this->MDB_common();
$this->phptype = 'xxx';
$this->dbsyntax = 'xxx';
// most of the following codes needs to be taken from the corresponding Metabase driver setup() methods
// the error code maps from corresponding PEAR DB driver constructor
// also please remember to "register" all driver specific options here like so
// $this->options['option_name'] = 'non NULL default value';
}
// }}}
// {{{ errorNative()
/**
* Get the native error code of the last error (if any) that
* occured on the current connection.
*
* @access public
*
* @return int native XXX error code
*/
function errorNative()
{
// take this method from the corresponding PEAR DB driver: errorNative()
}
// }}}
// {{{ xxxRaiseError()
/**
* This method is used to communicate an error and invoke error
* callbacks etc. Basically a wrapper for MDB::raiseError
* that checks for native error msgs.
*
* @param integer $errno error code
* @param string $message userinfo message
* @return object a PEAR error object
* @access public
* @see PEAR_Error
*/
function xxxRaiseError($errno = NULL, $message = NULL)
{
// take this method from the corresponding PEAR DB driver: xxxRaiseError()
}
// }}}
// {{{ autoCommit()
/**
* Define whether database changes done on the database be automatically
* committed. This function may also implicitly start or end a transaction.
*
* @param boolean $auto_commit flag that indicates whether the database
* changes should be committed right after
* executing every query statement. If this
* argument is 0 a transaction implicitly
* started. Otherwise, if a transaction is
* in progress it is ended by committing any
* database changes that were pending.
*
* @access public
*
* @return mixed MDB_OK on success, a MDB error on failure
*/
function autoCommit($auto_commit)
{
// take this from the corresponding Metabase driver: AutoCommitTransactions()
// the MetabaseShutdownTransactions function is handled by the PEAR desctructor
}
// }}}
// {{{ commit()
/**
* Commit the database changes done during a transaction that is in
* progress. This function may only be called when auto-committing is
* disabled, otherwise it will fail. Therefore, a new transaction is
* implicitly started after committing the pending changes.
*
* @access public
*
* @return mixed MDB_OK on success, a MDB error on failure
*/
function commit()
{
// take this from the corresponding Metabase driver: CommitTransaction()
}
// }}}
// {{{ rollback()
/**
* Cancel any database changes done during a transaction that is in
* progress. This function may only be called when auto-committing is
* disabled, otherwise it will fail. Therefore, a new transaction is
* implicitly started after canceling the pending changes.
*
* @access public
*
* @return mixed MDB_OK on success, a MDB error on failure
*/
function rollback()
{
// take this from the corresponding Metabase driver: RollbackTransaction()
}
// }}}
// {{{ connect()
/**
* Connect to the database
*
* @return TRUE on success, MDB_Error on failure
**/
function connect()
{
// take this from the corresponding Metabase driver: Connect() and Setup()
if (PEAR::isError(PEAR::loadExtension($this->phptype))) {
return(PEAR::raiseError(NULL, MDB_ERROR_NOT_FOUND,
NULL, NULL, 'extension '.$this->phptype.' is not compiled into PHP',
'MDB_Error', TRUE));
}
}
// }}}
// {{{ _close()
/**
* all the RDBMS specific things needed close a DB connection
*
* @access private
*
*/
function _close()
{
// take this from the corresponding Metabase driver: Close()
}
// }}}
// {{{ query()
/**
* Send a query to the database and return any results
*
* @access public
*
* @param string $query the SQL query
* @param array $types array that contains the types of the columns in
* the result set
*
* @return mixed a result handle or MDB_OK on success, a MDB error on failure
*/
function query($query, $types = NULL)
{
// take this from the corresponding Metabase driver: Query()
}
// }}}
// {{{ subSelect()
/**
* simple subselect emulation for Mysql
*
* @access public
*
* @param string $query the SQL query for the subselect that may only
* return a column
* @param string $quote determines if the data needs to be quoted before
* being returned
*
* @return string the query
*/
function subSelect($query, $quote = FALSE)
{
// This is a new method that only needs to be added if the RDBMS does
// not support sub-selects. See the MySQL driver for an example
}
// }}}
// {{{ replace()
/**
* Execute a SQL REPLACE query. A REPLACE query is identical to a INSERT
* query, except that if there is already a row in the table with the same
* key field values, the REPLACE query just updates its values instead of
* inserting a new row.
*
* The REPLACE type of query does not make part of the SQL standards. Since
* practically only MySQL implements it natively, this type of query is
* emulated through this method for other DBMS using standard types of
* queries inside a transaction to assure the atomicity of the operation.
*
* @access public
*
* @param string $table name of the table on which the REPLACE query will
* be executed.
* @param array $fields associative array that describes the fields and the
* values that will be inserted or updated in the specified table. The
* indexes of the array are the names of all the fields of the table. The
* values of the array are also associative arrays that describe the
* values and other properties of the table fields.
*
* Here follows a list of field properties that need to be specified:
*
* Value:
* Value to be assigned to the specified field. This value may be
* of specified in database independent type format as this
* function can perform the necessary datatype conversions.
*
* Default:
* this property is required unless the Null property
* is set to 1.
*
* Type
* Name of the type of the field. Currently, all types Metabase
* are supported except for clob and blob.
*
* Default: text
*
* Null
* Boolean property that indicates that the value for this field
* should be set to NULL.
*
* The default value for fields missing in INSERT queries may be
* specified the definition of a table. Often, the default value
* is already NULL, but since the REPLACE may be emulated using
* an UPDATE query, make sure that all fields of the table are
* listed in this function argument array.
*
* Default: 0
*
* Key
* Boolean property that indicates that this field should be
* handled as a primary key or at least as part of the compound
* unique index of the table that will determine the row that will
* updated if it exists or inserted a new row otherwise.
*
* This function will fail if no key field is specified or if the
* value of a key field is set to NULL because fields that are
* part of unique index they may not be NULL.
*
* Default: 0
*
* @return mixed MDB_OK on success, a MDB error on failure
*/
function replace($table, $fields)
{
// take this from the corresponding Metabase driver: Replace()
}
// }}}
// {{{ getColumnNames()
/**
* Retrieve the names of columns returned by the DBMS in a query result.
*
* @param resource $result result identifier
* @return mixed an associative array variable
* that will hold the names of columns. The
* indexes of the array are the column names
* mapped to lower case and the values are the
* respective numbers of the columns starting
* from 0. Some DBMS may not return any
* columns when the result set does not
* contain any rows.
*
* a MDB error on failure
* @access public
*/
function getColumnNames($result)
{
// take this from the corresponding Metabase driver: GetColumnNames()
}
// }}}
// {{{ numCols()
/**
* Count the number of columns returned by the DBMS in a query result.
*
* @param resource $result result identifier
* @access public
* @return mixed integer value with the number of columns, a MDB error
* on failure
*/
function numCols($result)
{
// take this from the corresponding Metabase driver: NumberOfColumns()
}
// }}}
// {{{ endOfResult()
/**
* check if the end of the result set has been reached
*
* @param resource $result result identifier
* @return mixed TRUE or FALSE on sucess, a MDB error on failure
* @access public
*/
function endOfResult($result)
{
// take this from the corresponding Metabase driver: EndOfResult()
}
// }}}
// {{{ _retrieveLob()
/**
* fetch a float value from a result set
*
* @param int $lob handle to a lob created by the createLob() function
* @return mixed MDB_OK on success, a MDB error on failure
* @access private
*/
function _retrieveLob($lob)
{
// take this from the corresponding Metabase driver: RetrieveLOB()
}
// }}}
// {{{ endOfResultLob()
/**
* Determine whether it was reached the end of the large object and
* therefore there is no more data to be read for the its input stream.
*
* @param int $lob handle to a lob created by the createLob() function
* @return mixed TRUE or FALSE on success, a MDB error on failure
* @access public
*/
function endOfResultLob($lob)
{
// take this from the corresponding Metabase driver: EndOfResultLOB()
}
// }}}
// {{{ _readResultLob()
/**
* Read data from large object input stream.
*
* @param int $lob handle to a lob created by the createLob() function
* @param blob $data reference to a variable that will hold data to be
* read from the large object input stream
* @param int $length integer value that indicates the largest ammount of
* data to be read from the large object input stream.
* @return mixed length on success, a MDB error on failure
* @access private
*/
function _readResultLob($lob, &$data, $length)
{
// take this from the corresponding Metabase driver: ReadResultLOB()
}
// }}}
// {{{ _destroyResultLob()
/**
* Free any resources allocated during the lifetime of the large object
* handler object.
*
* @param int $lob handle to a lob created by the createLob() function
* @access private
*/
function _destroyResultLob($lob)
{
// take this from the corresponding Metabase driver: DestroyResultLOB()
}
// }}}
// {{{ fetch()
/**
* fetch value from a result set
*
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed string on success, a MDB error on failure
* @access public
*/
function fetch($result, $row, $field)
{
// take this from the corresponding Metabase driver: FetchResult()
}
// }}}
// {{{ fetchClob()
/**
* fetch a clob value from a result set
*
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed content of the specified data cell, a MDB error on failure,
* a MDB error on failure
* @access public
*/
function fetchClob($result, $row, $field)
{
// take this from the corresponding Metabase driver: FetchCLOB()
}
// }}}
// {{{ fetchBlob()
/**
* fetch a blob value from a result set
*
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed content of the specified data cell, a MDB error on failure
* @access public
*/
function fetchBlob($result, $row, $field)
{
// take this from the corresponding Metabase driver: FetchBLOB()
}
// }}}
// {{{ resultIsNull()
/**
* Determine whether the value of a query result located in given row and
* field is a NULL.
*
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed TRUE or FALSE on success, a MDB error on failure
* @access public
*/
function resultIsNull($result, $row, $field)
{
// take this from the corresponding Metabase driver: ResultIsNull()
}
// }}}
// {{{ convertResult()
/**
* convert a value to a RDBMS indepdenant MDB type
*
* @param mixed $value value to be converted
* @param int $type constant that specifies which type to convert to
* @return mixed converted value
* @access public
*/
function convertResult($value, $type)
{
// take this from the corresponding Metabase driver: ConvertResult()
}
// }}}
// {{{ numRows()
/**
* returns the number of rows in a result object
*
* @param ressource $result a valid result ressouce pointer
* @return mixed MDB_Error or the number of rows
* @access public
*/
function numRows($result)
{
// take this from the corresponding Metabase driver: NumberOfRows()
}
// }}}
// {{{ freeResult()
/**
* Free the internal resources associated with $result.
*
* @param $result result identifier
* @return bool TRUE on success, FALSE if $result is invalid
* @access public
*/
function freeResult($result)
{
// take this from the corresponding Metabase driver: FreeResult()
}
// }}}
// {{{ get*Declaration()
// take phpdoc comments from MDB common.php: get*Declaration()
function get*Declaration($name, $field)
{
// take this from the corresponding Metabase driver: Get*FieldValue()
}
// }}}
// {{{ get*Value()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param resource $prepared_query query handle from prepare()
* @param $parameter
* @param $clob
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access public
*/
function get*Value($prepared_query, $parameter, $clob)
{
// take this from the corresponding Metabase driver: Get*FieldValue()
}
// }}}
// {{{ getClobValue()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param resource $prepared_query query handle from prepare()
* @param $parameter
* @param $clob
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access public
*/
function getClobValue($prepared_query, $parameter, $clob)
{
// take this from the corresponding Metabase driver: GetCLOBFieldValue()
}
// }}}
// {{{ freeClobValue()
/**
* free a chracter large object
*
* @param resource $prepared_query query handle from prepare()
* @param string $clob
* @param string $value
* @return MDB_OK
* @access public
*/
function freeClobValue($prepared_query, $clob, &$value)
{
// take this from the corresponding Metabase driver: FreeClobValue()
}
// }}}
// {{{ getBlobValue()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param resource $prepared_query query handle from prepare()
* @param $parameter
* @param $blob
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access public
*/
function getBlobValue($prepared_query, $parameter, $blob)
{
// take this from the corresponding Metabase driver: GetBLOBFieldValue()
}
// }}}
// {{{ freeBlobValue()
/**
* free a binary large object
*
* @param resource $prepared_query query handle from prepare()
* @param string $blob
* @return MDB_OK
* @access public
*/
function freeBlobValue($prepared_query, $blob)
{
// take this from the corresponding Metabase driver: FreeBlobValue()
}
// }}}
// {{{ nextId()
/**
* returns the next free id of a sequence
*
* @param string $seq_name name of the sequence
* @param boolean $ondemand when true the seqence is
* automatic created, if it
* not exists
*
* @return mixed MDB_Error or id
* @access public
*/
function nextId($seq_name, $ondemand = FALSE)
{
// take this from the corresponding PEAR DB driver: nextId()
}
// }}}
// {{{ currId()
/**
* returns the current id of a sequence
*
* @param string $seq_name name of the sequence
* @return mixed MDB_Error or id
* @access public
*/
function currId($seq_name)
{
// take this from the corresponding Metabase driver: GetSequenceCurrentValue()
}
// }}}
// {{{ fetchInto()
/**
* Fetch a row and insert the data into an existing array.
*
* @param resource $result result identifier
* @param int $fetchmode how the array data should be indexed
* @param int $rownum the row number to fetch
* @return int data array on success, a MDB error on failure
* @access public
*/
function fetchInto($result, $fetchmode = MDB_FETCHMODE_DEFAULT, $rownum = 0)
{
// take this from the corresponding Metabase driver: FetchResultArray()
// possibly you also need to take code from Metabases FetchRow() method
// note Metabases FetchRow() method should not be confused with MDB's fetchRow()
}
// }}}
// {{{ nextResult()
/**
* Move the internal mysql result pointer to the next available result
* Currently not supported
*
* @param a valid result resource
* @return true if a result is available otherwise return false
* @access public
*/
function nextResult($result)
{
// take this from the corresponding PEAR DB driver: nextResult()
}
// }}}
// {{{ tableInfo()
/**
* returns meta data about the result set
*
* @param resource $result result identifier
* @param mixed $mode depends on implementation
* @return array an nested array, or a MDB error
* @access public
*/
function tableInfo($result, $mode = NULL) {
// take this from the corresponding PEAR DB driver: tableInfo()
}
}
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