ibase.php

来自「视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.」· PHP 代码 · 共 1,072 行 · 第 1/3 页

<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * The PEAR DB driver for PHP's interbase extension
 * for interacting with Interbase and Firebird databases
 *
 * While this class works with PHP 4, PHP's InterBase extension is
 * unstable in PHP 4.  Use PHP 5.
 *
 * PHP versions 4 and 5
 *
 * LICENSE: This source file is subject to version 3.0 of the PHP license
 * that is available through the world-wide-web at the following URI:
 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of
 * the PHP License and are unable to obtain it through the web, please
 * send a note to [e-mail] so we can mail you a copy immediately.
 *
 * @category   Database
 * @package    DB
 * @author     Sterling Hughes <[e-mail]>
 * @author     Daniel Convissor <[e-mail]>
 * @copyright  1997-2005 The PHP Group
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @version    CVS: $Id: ibase.php,v 1.109 2005/03/04 23:12:36 danielc Exp $
 * @link       http://pear.php.net/package/DB
 */

/**
 * Obtain the DB_common class so it can be extended from
 */
require_once 'DB/common.php';

/**
 * The methods PEAR DB uses to interact with PHP's interbase extension
 * for interacting with Interbase and Firebird databases
 *
 * These methods overload the ones declared in DB_common.
 *
 * While this class works with PHP 4, PHP's InterBase extension is
 * unstable in PHP 4.  Use PHP 5.
 *
 * NOTICE:  limitQuery() only works for Firebird.
 *
 * @category   Database
 * @package    DB
 * @author     Sterling Hughes <[e-mail]>
 * @author     Daniel Convissor <[e-mail]>
 * @copyright  1997-2005 The PHP Group
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @version    Release: 1.7.6
 * @link       http://pear.php.net/package/DB
 * @since      Class became stable in Release 1.7.0
 */
class DB_ibase extends DB_common
{
    // {{{ properties

    /**
     * The DB driver type (mysql, oci8, odbc, etc.)
     * @var string
     */
    var $phptype = 'ibase';

    /**
     * The database syntax variant to be used (db2, access, etc.), if any
     * @var string
     */
    var $dbsyntax = 'ibase';

    /**
     * The capabilities of this DB implementation
     *
     * The 'new_link' element contains the PHP version that first provided
     * new_link support for this DBMS.  Contains false if it's unsupported.
     *
     * Meaning of the 'limit' element:
     *   + 'emulate' = emulate with fetch row by number
     *   + 'alter'   = alter the query
     *   + false     = skip rows
     *
     * NOTE: only firebird supports limit.
     *
     * @var array
     */
    var $features = array(
        'limit'         => false,
        'new_link'      => false,
        'numrows'       => 'emulate',
        'pconnect'      => true,
        'prepare'       => true,
        'ssl'           => false,
        'transactions'  => true,
    );

    /**
     * A mapping of native error codes to DB error codes
     * @var array
     */
    var $errorcode_map = array(
        -104 => DB_ERROR_SYNTAX,
        -150 => DB_ERROR_ACCESS_VIOLATION,
        -151 => DB_ERROR_ACCESS_VIOLATION,
        -155 => DB_ERROR_NOSUCHTABLE,
        -157 => DB_ERROR_NOSUCHFIELD,
        -158 => DB_ERROR_VALUE_COUNT_ON_ROW,
        -170 => DB_ERROR_MISMATCH,
        -171 => DB_ERROR_MISMATCH,
        -172 => DB_ERROR_INVALID,
        // -204 =>  // Covers too many errors, need to use regex on msg
        -205 => DB_ERROR_NOSUCHFIELD,
        -206 => DB_ERROR_NOSUCHFIELD,
        -208 => DB_ERROR_INVALID,
        -219 => DB_ERROR_NOSUCHTABLE,
        -297 => DB_ERROR_CONSTRAINT,
        -303 => DB_ERROR_INVALID,
        -413 => DB_ERROR_INVALID_NUMBER,
        -530 => DB_ERROR_CONSTRAINT,
        -551 => DB_ERROR_ACCESS_VIOLATION,
        -552 => DB_ERROR_ACCESS_VIOLATION,
        // -607 =>  // Covers too many errors, need to use regex on msg
        -625 => DB_ERROR_CONSTRAINT_NOT_NULL,
        -803 => DB_ERROR_CONSTRAINT,
        -804 => DB_ERROR_VALUE_COUNT_ON_ROW,
        -904 => DB_ERROR_CONNECT_FAILED,
        -922 => DB_ERROR_NOSUCHDB,
        -923 => DB_ERROR_CONNECT_FAILED,
        -924 => DB_ERROR_CONNECT_FAILED
    );

    /**
     * The raw database connection created by PHP
     * @var resource
     */
    var $connection;

    /**
     * The DSN information for connecting to a database
     * @var array
     */
    var $dsn = array();


    /**
     * The number of rows affected by a data manipulation query
     * @var integer
     * @access private
     */
    var $affected = 0;

    /**
     * Should data manipulation queries be committed automatically?
     * @var bool
     * @access private
     */
    var $autocommit = true;

    /**
     * The prepared statement handle from the most recently executed statement
     *
     * {@internal  Mainly here because the InterBase/Firebird API is only
     * able to retrieve data from result sets if the statemnt handle is
     * still in scope.}}
     *
     * @var resource
     */
    var $last_stmt;

    /**
     * Is the given prepared statement a data manipulation query?
     * @var array
     * @access private
     */
    var $manip_query = array();


    // }}}
    // {{{ constructor

    /**
     * This constructor calls <kbd>$this->DB_common()</kbd>
     *
     * @return void
     */
    function DB_ibase()
    {
        $this->DB_common();
    }

    // }}}
    // {{{ connect()

    /**
     * Connect to the database server, log in and open the database
     *
     * Don't call this method directly.  Use DB::connect() instead.
     *
     * PEAR DB's ibase driver supports the following extra DSN options:
     *   + buffers    The number of database buffers to allocate for the
     *                 server-side cache.
     *   + charset    The default character set for a database.
     *   + dialect    The default SQL dialect for any statement
     *                 executed within a connection.  Defaults to the
     *                 highest one supported by client libraries.
     *                 Functional only with InterBase 6 and up.
     *   + role       Functional only with InterBase 5 and up.
     *
     * @param array $dsn         the data source name
     * @param bool  $persistent  should the connection be persistent?
     *
     * @return int  DB_OK on success. A DB_Error object on failure.
     */
    function connect($dsn, $persistent = false)
    {
        if (!PEAR::loadExtension('interbase')) {
            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
        }

        $this->dsn = $dsn;
        if ($dsn['dbsyntax']) {
            $this->dbsyntax = $dsn['dbsyntax'];
        }
        if ($this->dbsyntax == 'firebird') {
            $this->features['limit'] = 'alter';
        }

        $params = array(
            $dsn['hostspec']
                    ? ($dsn['hostspec'] . ':' . $dsn['database'])
                    : $dsn['database'],
            $dsn['username'] ? $dsn['username'] : null,
            $dsn['password'] ? $dsn['password'] : null,
            isset($dsn['charset']) ? $dsn['charset'] : null,
            isset($dsn['buffers']) ? $dsn['buffers'] : null,
            isset($dsn['dialect']) ? $dsn['dialect'] : null,
            isset($dsn['role'])    ? $dsn['role'] : null,
        );

        $connect_function = $persistent ? 'ibase_pconnect' : 'ibase_connect';

        $this->connection = @call_user_func_array($connect_function, $params);
        if (!$this->connection) {
            return $this->ibaseRaiseError(DB_ERROR_CONNECT_FAILED);
        }
        return DB_OK;
    }

    // }}}
    // {{{ disconnect()

    /**
     * Disconnects from the database server
     *
     * @return bool  TRUE on success, FALSE on failure
     */
    function disconnect()
    {
        $ret = @ibase_close($this->connection);
        $this->connection = null;
        return $ret;
    }

    // }}}
    // {{{ simpleQuery()

    /**
     * Sends a query to the database server
     *
     * @param string  the SQL query string
     *
     * @return mixed  + a PHP result resrouce for successful SELECT queries
     *                + the DB_OK constant for other successful queries
     *                + a DB_Error object on failure
     */
    function simpleQuery($query)
    {
        $ismanip = DB::isManip($query);
        $this->last_query = $query;
        $query = $this->modifyQuery($query);
        $result = @ibase_query($this->connection, $query);

        if (!$result) {
            return $this->ibaseRaiseError();
        }
        if ($this->autocommit && $ismanip) {
            @ibase_commit($this->connection);
        }
        if ($ismanip) {
            $this->affected = $result;
            return DB_OK;
        } else {
            $this->affected = 0;
            return $result;
        }
    }

    // }}}
    // {{{ modifyLimitQuery()

    /**
     * Adds LIMIT clauses to a query string according to current DBMS standards
     *
     * Only works with Firebird.
     *
     * @param string $query   the query to modify
     * @param int    $from    the row to start to fetching (0 = the first row)
     * @param int    $count   the numbers of rows to fetch
     * @param mixed  $params  array, string or numeric data to be used in
     *                         execution of the statement.  Quantity of items
     *                         passed must match quantity of placeholders in
     *                         query:  meaning 1 placeholder for non-array
     *                         parameters or 1 placeholder per array element.
     *
     * @return string  the query string with LIMIT clauses added
     *
     * @access protected
     */
    function modifyLimitQuery($query, $from, $count, $params = array())
    {
        if ($this->dsn['dbsyntax'] == 'firebird') {
            $query = preg_replace('/^([\s(])*SELECT/i',
                                  "SELECT FIRST $count SKIP $from", $query);
        }
        return $query;
    }

    // }}}
    // {{{ nextResult()

    /**
     * Move the internal ibase result pointer to the next available result
     *
     * @param a valid fbsql result resource
     *
     * @access public
     *
     * @return true if a result is available otherwise return false
     */
    function nextResult($result)
    {
        return false;
    }

    // }}}
    // {{{ fetchInto()

    /**
     * Places a row from the result set into the given array
     *
     * Formating of the array and the data therein are configurable.
     * See DB_result::fetchInto() for more information.
     *
     * This method is not meant to be called directly.  Use
     * DB_result::fetchInto() instead.  It can't be declared "protected"
     * because DB_result is a separate object.
     *
     * @param resource $result    the query result resource