Source for file skeleton.php
Documentation is available at skeleton.php
// +----------------------------------------------------------------------+
// +----------------------------------------------------------------------+
// | 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 |
// | 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');
* @author YOUR NAME <YOUR EMAIL>
// 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.
// 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';
* Get the native error code of the last error (if any) that
* occured on the current connection.
* @return int native XXX error code
// take this method from the corresponding PEAR DB driver: errorNative()
* 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
// take this method from the corresponding PEAR DB driver: xxxRaiseError()
* Define whether database changes done on the database be automatically
* committed. This function may also implicitly start or end a transaction.
* @param boolean $auto_commit flag that indicates whether the database
* changes should be committed right after
* executing every query statement. If this
* argument is 0 a transaction implicitly
* started. Otherwise, if a transaction is
* in progress it is ended by committing any
* database changes that were pending.
* @return mixed MDB_OK on success, a MDB error on failure
// take this from the corresponding Metabase driver: AutoCommitTransactions()
// the MetabaseShutdownTransactions function is handled by the PEAR desctructor
* Commit the database changes done during a transaction that is in
* progress. This function may only be called when auto-committing is
* disabled, otherwise it will fail. Therefore, a new transaction is
* implicitly started after committing the pending changes.
* @return mixed MDB_OK on success, a MDB error on failure
// take this from the corresponding Metabase driver: CommitTransaction()
* Cancel any database changes done during a transaction that is in
* progress. This function may only be called when auto-committing is
* disabled, otherwise it will fail. Therefore, a new transaction is
* implicitly started after canceling the pending changes.
* @return mixed MDB_OK on success, a MDB error on failure
// take this from the corresponding Metabase driver: RollbackTransaction()
* Connect to the database
* @return TRUE on success, MDB_Error on failure
// take this from the corresponding Metabase driver: Connect() and Setup()
if (PEAR ::isError (PEAR ::loadExtension ($this->phptype))) {
NULL , NULL , 'extension '. $this->phptype. ' is not compiled into PHP',
* all the RDBMS specific things needed close a DB connection
// take this from the corresponding Metabase driver: Close()
* Send a query to the database and return any results
* @param string $query the SQL query
* @param array $types array that contains the types of the columns in
* @return mixed a result handle or MDB_OK on success, a MDB error on failure
function query($query, $types = NULL )
// take this from the corresponding Metabase driver: Query()
* simple subselect emulation for Mysql
* @param string $query the SQL query for the subselect that may only
* @param string $quote determines if the data needs to be quoted before
* @return string the query
// 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
* 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
* 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.
* @param string $table name of the table on which the REPLACE query will
* @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 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.
* this property is required unless the Null property
* Name of the type of the field. Currently, all types Metabase
* are supported except for clob and blob.
* Boolean property that indicates that the value for this field
* 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.
* 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.
* @return mixed MDB_OK on success, a MDB error on failure
// take this from the corresponding Metabase driver: Replace()
* 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
// take this from the corresponding Metabase driver: GetColumnNames()
* Count the number of columns returned by the DBMS in a query result.
* @param resource $result result identifier
* @return mixed integer value with the number of columns, a MDB error
// take this from the corresponding Metabase driver: NumberOfColumns()
* 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
// take this from the corresponding Metabase driver: EndOfResult()
* fetch a float value from a result set
* @param int $lob handle to a lob created by the createLob() function
* @return mixed MDB_OK on success, a MDB error on failure
function _retrieveLob ($lob)
// take this from the corresponding Metabase driver: RetrieveLOB()
* 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
// take this from the corresponding Metabase driver: EndOfResultLOB()
* 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 $length integer value that indicates the largest ammount of
* data to be read from the large object input stream.
* @return mixed length on success, a MDB error on failure
function _readResultLob ($lob, &$data, $length)
// take this from the corresponding Metabase driver: ReadResultLOB()
// {{{ _destroyResultLob()
* Free any resources allocated during the lifetime of the large object
* @param int $lob handle to a lob created by the createLob() function
function _destroyResultLob ($lob)
// take this from the corresponding Metabase driver: DestroyResultLOB()
* 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 $field field number where the data can be found
* @return mixed string on success, a MDB error on failure
function fetch($result, $row, $field)
// take this from the corresponding Metabase driver: FetchResult()
* 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,
// take this from the corresponding Metabase driver: FetchCLOB()
* 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
// take this from the corresponding Metabase driver: FetchBLOB()
* Determine whether the value of a query result located in given row and
* @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
// take this from the corresponding Metabase driver: ResultIsNull()
* 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
// take this from the corresponding Metabase driver: ConvertResult()
* 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
// take this from the corresponding Metabase driver: NumberOfRows()
* Free the internal resources associated with $result.
* @param $result result identifier
* @return bool TRUE on success, FALSE if $result is invalid
// take this from the corresponding Metabase driver: FreeResult()
// take phpdoc comments from MDB common.php: get*Declaration()
function get*Declaration ($name, $field)
// take this from the corresponding Metabase driver: Get*FieldValue()
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
* @param resource $prepared_query query handle from prepare()
* @return string text string that represents the given argument value in
* a DBMS specific format.
function get*Value ($prepared_query, $parameter, $clob)
// take this from the corresponding Metabase driver: Get*FieldValue()
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
* @param resource $prepared_query query handle from prepare()
* @return string text string that represents the given argument value in
* a DBMS specific format.
// take this from the corresponding Metabase driver: GetCLOBFieldValue()
* free a chracter large object
* @param resource $prepared_query query handle from prepare()
// take this from the corresponding Metabase driver: FreeClobValue()
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
* @param resource $prepared_query query handle from prepare()
* @return string text string that represents the given argument value in
* a DBMS specific format.
// take this from the corresponding Metabase driver: GetBLOBFieldValue()
* free a binary large object
* @param resource $prepared_query query handle from prepare()
// take this from the corresponding Metabase driver: FreeBlobValue()
* returns the next free id of a sequence
* @param string $seq_name name of the sequence
* @param boolean $ondemand when true the seqence is
* automatic created, if it
* @return mixed MDB_Error or id
function nextId($seq_name, $ondemand = FALSE )
// take this from the corresponding PEAR DB driver: nextId()
* returns the current id of a sequence
* @param string $seq_name name of the sequence
* @return mixed MDB_Error or id
// take this from the corresponding Metabase driver: GetSequenceCurrentValue()
* 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 $rownum the row number to fetch
* @return int data array on success, a MDB error on failure
function fetchInto($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()
* 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
// take this from the corresponding PEAR DB driver: nextResult()
* 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
// take this from the corresponding PEAR DB driver: tableInfo()
Documentation generated on Mon, 11 Mar 2019 10:15:32 -0400 by phpDocumentor 1.4.4. PEAR Logo Copyright © PHP Group 2004.
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