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<?php

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

/**

 * The PEAR DB driver for PHP's odbc extension

 * for interacting with databases via ODBC connections

 *

 * PHP version 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 license@php.net so we can mail you a copy immediately.

 *

 * @category   Database

 * @package    DB

 * @author     Stig Bakken <ssb@php.net>

 * @author     Daniel Convissor <danielc@php.net>

 * @copyright  1997-2007 The PHP Group

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @version    CVS: $Id$

 * @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 odbc extension

 * for interacting with databases via ODBC connections

 *

 * These methods overload the ones declared in DB_common.

 *

 * More info on ODBC errors could be found here:

 * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/trblsql/tr_err_odbc_5stz.asp

 *

 * @category   Database

 * @package    DB

 * @author     Stig Bakken <ssb@php.net>

 * @author     Daniel Convissor <danielc@php.net>

 * @copyright  1997-2007 The PHP Group

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @version    Release: 1.9.2

 * @link       http://pear.php.net/package/DB

 */

class DB_odbc extends DB_common

{

    // {{{ properties

    /**

     * The DB driver type (mysql, oci8, odbc, etc.)

     * @var string

     */

    var $phptype = 'odbc';

    /**

     * The database syntax variant to be used (db2, access, etc.), if any

     * @var string

     */

    var $dbsyntax = 'sql92';

    /**

     * 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: The feature set of the following drivers are different than

     * the default:

     *   + solid: 'transactions' = true

     *   + navision: 'limit' = false

     *

     * @var array

     */

    var $features = array(

        'limit'         => 'emulate',

        'new_link'      => false,

        'numrows'       => true,

        'pconnect'      => true,

        'prepare'       => false,

        'ssl'           => false,

        'transactions'  => false,

    );

    /**

     * A mapping of native error codes to DB error codes

     * @var array

     */

    var $errorcode_map = array(

        '01004' => DB_ERROR_TRUNCATED,

        '07001' => DB_ERROR_MISMATCH,

        '21S01' => DB_ERROR_VALUE_COUNT_ON_ROW,

        '21S02' => DB_ERROR_MISMATCH,

        '22001' => DB_ERROR_INVALID,

        '22003' => DB_ERROR_INVALID_NUMBER,

        '22005' => DB_ERROR_INVALID_NUMBER,

        '22008' => DB_ERROR_INVALID_DATE,

        '22012' => DB_ERROR_DIVZERO,

        '23000' => DB_ERROR_CONSTRAINT,

        '23502' => DB_ERROR_CONSTRAINT_NOT_NULL,

        '23503' => DB_ERROR_CONSTRAINT,

        '23504' => DB_ERROR_CONSTRAINT,

        '23505' => DB_ERROR_CONSTRAINT,

        '24000' => DB_ERROR_INVALID,

        '34000' => DB_ERROR_INVALID,

        '37000' => DB_ERROR_SYNTAX,

        '42000' => DB_ERROR_SYNTAX,

        '42601' => DB_ERROR_SYNTAX,

        'IM001' => DB_ERROR_UNSUPPORTED,

        'S0000' => DB_ERROR_NOSUCHTABLE,

        'S0001' => DB_ERROR_ALREADY_EXISTS,

        'S0002' => DB_ERROR_NOSUCHTABLE,

        'S0011' => DB_ERROR_ALREADY_EXISTS,

        'S0012' => DB_ERROR_NOT_FOUND,

        'S0021' => DB_ERROR_ALREADY_EXISTS,

        'S0022' => DB_ERROR_NOSUCHFIELD,

        'S1009' => DB_ERROR_INVALID,

        'S1090' => DB_ERROR_INVALID,

        'S1C00' => DB_ERROR_NOT_CAPABLE,

    );

    /**

     * 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;

    // }}}

    // {{{ constructor

    /**

     * This constructor calls <kbd>parent::__construct()</kbd>

     *

     * @return void

     */

    function __construct()

    {

        parent::__construct();

    }

    // }}}

    // {{{ 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 odbc driver supports the following extra DSN options:

     *   + cursor  The type of cursor to be used for this connection.

     *

     * @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('odbc')) {

            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);

        }

        $this->dsn = $dsn;

        if ($dsn['dbsyntax']) {

            $this->dbsyntax = $dsn['dbsyntax'];

        }

        switch ($this->dbsyntax) {

            case 'access':

            case 'db2':

            case 'solid':

                $this->features['transactions'] = true;

                break;

            case 'navision':

                $this->features['limit'] = false;

        }

        /*

         * This is hear for backwards compatibility. Should have been using

         * 'database' all along, but prior to 1.6.0RC3 'hostspec' was used.

         */

        if ($dsn['database']) {

            $odbcdsn = $dsn['database'];

        } elseif ($dsn['hostspec']) {

            $odbcdsn = $dsn['hostspec'];

        } else {

            $odbcdsn = 'localhost';

        }

        $connect_function = $persistent ? 'odbc_pconnect' : 'odbc_connect';

        if (empty($dsn['cursor'])) {

            $this->connection = @$connect_function($odbcdsn, $dsn['username'],

                                                   $dsn['password']);

        } else {

            $this->connection = @$connect_function($odbcdsn, $dsn['username'],

                                                   $dsn['password'],

                                                   $dsn['cursor']);

        }

        if (!is_resource($this->connection)) {

            return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                     null, null, null,

                                     $this->errorNative());

        }

        return DB_OK;

    }

    // }}}

    // {{{ disconnect()

    /**

     * Disconnects from the database server

     *

     * @return bool  TRUE on success, FALSE on failure

     */

    function disconnect()

    {

        $err = @odbc_close($this->connection);

        $this->connection = null;

        return $err;

    }

    // }}}

    // {{{ 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)

    {

        $this->last_query = $query;

        $query = $this->modifyQuery($query);

        $result = @odbc_exec($this->connection, $query);

        if (!$result) {

            return $this->odbcRaiseError(); // XXX ERRORMSG

        }

        // Determine which queries that should return data, and which

        // should return an error code only.

        if ($this->_checkManip($query)) {

            $this->affected = $result; // For affectedRows()

            return DB_OK;

        }

        $this->affected = 0;

        return $result;

    }

    // }}}

    // {{{ nextResult()

    /**

     * Move the internal odbc 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 @odbc_next_result($result);

    }

    // }}}

    // {{{ 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

     * @param array    $arr       the referenced array to put the data in

     * @param int      $fetchmode how the resulting array should be indexed

     * @param int      $rownum    the row number to fetch (0 = first row)

     *

     * @return mixed  DB_OK on success, NULL when the end of a result set is

     *                 reached or on failure

     *

     * @see DB_result::fetchInto()

     */

    function fetchInto($result, &$arr, $fetchmode, $rownum = null)

    {

        $arr = array();

        if ($rownum !== null) {

            $rownum++; // ODBC first row is 1

            if (version_compare(phpversion(), '4.2.0', 'ge')) {

                $cols = @odbc_fetch_into($result, $arr, $rownum);

            } else {

                $cols = @odbc_fetch_into($result, $rownum, $arr);

            }

        } else {

            $cols = @odbc_fetch_into($result, $arr);

        }

        if (!$cols) {

            return null;

        }

        if ($fetchmode !== DB_FETCHMODE_ORDERED) {

            for ($i = 0; $i < count($arr); $i++) {

                $colName = @odbc_field_name($result, $i+1);

                $a[$colName] = $arr[$i];

            }

            if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {

                $a = array_change_key_case($a, CASE_LOWER);

            }

            $arr = $a;

        }

        if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {

            $this->_rtrimArrayValues($arr);

        }

        if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {

            $this->_convertNullArrayValuesToEmpty($arr);

        }

        return DB_OK;

    }

    // }}}

    // {{{ freeResult()

    /**

     * Deletes the result set and frees the memory occupied by the result set

     *

     * This method is not meant to be called directly.  Use

     * DB_result::free() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result  PHP's query result resource

     *

     * @return bool  TRUE on success, FALSE if $result is invalid

     *

     * @see DB_result::free()

     */

    function freeResult($result)

    {

        return is_resource($result) ? odbc_free_result($result) : false;

    }

    // }}}

    // {{{ numCols()

    /**

     * Gets the number of columns in a result set

     *

     * This method is not meant to be called directly.  Use

     * DB_result::numCols() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result  PHP's query result resource

     *

     * @return int  the number of columns.  A DB_Error object on failure.

     *

     * @see DB_result::numCols()

     */

    function numCols($result)

    {

        $cols = @odbc_num_fields($result);

        if (!$cols) {

            return $this->odbcRaiseError();

        }

        return $cols;

    }

    // }}}

    // {{{ affectedRows()

    /**

     * Determines the number of rows affected by a data maniuplation query

     *

     * 0 is returned for queries that don't manipulate data.

     *

     * @return int  the number of rows.  A DB_Error object on failure.

     */

    function affectedRows()

    {

        if (empty($this->affected)) {  // In case of SELECT stms

            return 0;

        }

        $nrows = @odbc_num_rows($this->affected);

        if ($nrows == -1) {

            return $this->odbcRaiseError();

        }

        return $nrows;

    }

    // }}}

    // {{{ numRows()

    /**

     * Gets the number of rows in a result set

     *

     * Not all ODBC drivers support this functionality.  If they don't

     * a DB_Error object for DB_ERROR_UNSUPPORTED is returned.

     *

     * This method is not meant to be called directly.  Use

     * DB_result::numRows() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result  PHP's query result resource

     *

     * @return int  the number of rows.  A DB_Error object on failure.

     *

     * @see DB_result::numRows()

     */

    function numRows($result)

    {

        $nrows = @odbc_num_rows($result);

        if ($nrows == -1) {

            return $this->odbcRaiseError(DB_ERROR_UNSUPPORTED);

        }

        if ($nrows === false) {

            return $this->odbcRaiseError();

        }

        return $nrows;

    }

    // }}}

    // {{{ quoteIdentifier()

    /**

     * Quotes a string so it can be safely used as a table or column name

     *

     * Use 'mssql' as the dbsyntax in the DB DSN only if you've unchecked

     * "Use ANSI quoted identifiers" when setting up the ODBC data source.

     *

     * @param string $str  identifier name to be quoted

     *

     * @return string  quoted identifier string

     *

     * @see DB_common::quoteIdentifier()

     * @since Method available since Release 1.6.0

     */

    function quoteIdentifier($str)

    {

        switch ($this->dsn['dbsyntax']) {

            case 'access':

                return '[' . $str . ']';

            case 'mssql':

            case 'sybase':

                return '[' . str_replace(']', ']]', $str) . ']';

            case 'mysql':

            case 'mysqli':

                return '`' . $str . '`';

            default:

                return '"' . str_replace('"', '""', $str) . '"';

        }

    }

    // }}}

    // {{{ nextId()

    /**

     * Returns the next free id in a sequence

     *

     * @param string  $seq_name  name of the sequence

     * @param boolean $ondemand  when true, the seqence is automatically

     *                            created if it does not exist

     *

     * @return int  the next id number in the sequence.

     *               A DB_Error object on failure.

     *

     * @see DB_common::nextID(), DB_common::getSequenceName(),

     *      DB_odbc::createSequence(), DB_odbc::dropSequence()

     */

    function nextId($seq_name, $ondemand = true)

    {

        $seqname = $this->getSequenceName($seq_name);

        $repeat = 0;

        do {

            $this->pushErrorHandling(PEAR_ERROR_RETURN);

            $result = $this->query("update ${seqname} set id = id + 1");

            $this->popErrorHandling();

            if ($ondemand && DB::isError($result) &&

                $result->getCode() == DB_ERROR_NOSUCHTABLE) {

                $repeat = 1;

                $this->pushErrorHandling(PEAR_ERROR_RETURN);

                $result = $this->createSequence($seq_name);

                $this->popErrorHandling();

                if (DB::isError($result)) {

                    return $this->raiseError($result);

                }

                $result = $this->query("insert into ${seqname} (id) values(0)");

            } else {

                $repeat = 0;

            }

        } while ($repeat);

        if (DB::isError($result)) {

            return $this->raiseError($result);

        }

        $result = $this->query("select id from ${seqname}");

        if (DB::isError($result)) {

            return $result;

        }

        $row = $result->fetchRow(DB_FETCHMODE_ORDERED);

        if (DB::isError($row || !$row)) {

            return $row;

        }

        return $row[0];

    }

    /**

     * Creates a new sequence

     *

     * @param string $seq_name  name of the new sequence

     *

     * @return int  DB_OK on success.  A DB_Error object on failure.

     *

     * @see DB_common::createSequence(), DB_common::getSequenceName(),

     *      DB_odbc::nextID(), DB_odbc::dropSequence()

     */

    function createSequence($seq_name)

    {

        return $this->query('CREATE TABLE '

                            . $this->getSequenceName($seq_name)

                            . ' (id integer NOT NULL,'

                            . ' PRIMARY KEY(id))');

    }

    // }}}

    // {{{ dropSequence()

    /**

     * Deletes a sequence

     *

     * @param string $seq_name  name of the sequence to be deleted

     *

     * @return int  DB_OK on success.  A DB_Error object on failure.

     *

     * @see DB_common::dropSequence(), DB_common::getSequenceName(),

     *      DB_odbc::nextID(), DB_odbc::createSequence()

     */

    function dropSequence($seq_name)

    {

        return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));

    }

    // }}}

    // {{{ autoCommit()

    /**

     * Enables or disables automatic commits

     *

     * @param bool $onoff  true turns it on, false turns it off

     *

     * @return int  DB_OK on success.  A DB_Error object if the driver

     *               doesn't support auto-committing transactions.

     */

    function autoCommit($onoff = false)

    {

        if (!@odbc_autocommit($this->connection, $onoff)) {

            return $this->odbcRaiseError();

        }

        return DB_OK;

    }

    // }}}

    // {{{ commit()

    /**

     * Commits the current transaction

     *

     * @return int  DB_OK on success.  A DB_Error object on failure.

     */

    function commit()

    {

        if (!@odbc_commit($this->connection)) {

            return $this->odbcRaiseError();

        }

        return DB_OK;

    }

    // }}}

    // {{{ rollback()

    /**

     * Reverts the current transaction

     *

     * @return int  DB_OK on success.  A DB_Error object on failure.

     */

    function rollback()

    {

        if (!@odbc_rollback($this->connection)) {

            return $this->odbcRaiseError();

        }

        return DB_OK;

    }

    // }}}

    // {{{ odbcRaiseError()

    /**

     * Produces a DB_Error object regarding the current problem

     *

     * @param int $errno  if the error is being manually raised pass a

     *                     DB_ERROR* constant here.  If this isn't passed

     *                     the error information gathered from the DBMS.

     *

     * @return object  the DB_Error object

     *

     * @see DB_common::raiseError(),

     *      DB_odbc::errorNative(), DB_common::errorCode()

     */

    function odbcRaiseError($errno = null)

    {

        if ($errno === null) {

            switch ($this->dbsyntax) {

                case 'access':

                    if ($this->options['portability'] & DB_PORTABILITY_ERRORS) {

                        $this->errorcode_map['07001'] = DB_ERROR_NOSUCHFIELD;

                    } else {

                        // Doing this in case mode changes during runtime.

                        $this->errorcode_map['07001'] = DB_ERROR_MISMATCH;

                    }

                    $native_code = odbc_error($this->connection);

                    // S1000 is for "General Error."  Let's be more specific.

                    if ($native_code == 'S1000') {

                        $errormsg = odbc_errormsg($this->connection);

                        static $error_regexps;

                        if (!isset($error_regexps)) {

                            $error_regexps = array(

                                '/includes related records.$/i'  => DB_ERROR_CONSTRAINT,

                                '/cannot contain a Null value/i' => DB_ERROR_CONSTRAINT_NOT_NULL,

                            );

                        }

                        foreach ($error_regexps as $regexp => $code) {

                            if (preg_match($regexp, $errormsg)) {

                                return $this->raiseError($code,

                                        null, null, null,

                                        $native_code . ' ' . $errormsg);

                            }

                        }

                        $errno = DB_ERROR;

                    } else {

                        $errno = $this->errorCode($native_code);

                    }

                    break;

                default:

                    $errno = $this->errorCode(odbc_error($this->connection));

            }

        }

        return $this->raiseError($errno, null, null, null,

                                 $this->errorNative());

    }

    // }}}

    // {{{ errorNative()

    /**

     * Gets the DBMS' native error code and message produced by the last query

     *

     * @return string  the DBMS' error code and message

     */

    function errorNative()

    {

        if (!is_resource($this->connection)) {

            return @odbc_error() . ' ' . @odbc_errormsg();

        }

        return @odbc_error($this->connection) . ' ' . @odbc_errormsg($this->connection);

    }

    // }}}

    // {{{ tableInfo()

    /**

     * Returns information about a table or a result set

     *

     * @param object|string  $result  DB_result object from a query or a

     *                                 string containing the name of a table.

     *                                 While this also accepts a query result

     *                                 resource identifier, this behavior is

     *                                 deprecated.

     * @param int            $mode    a valid tableInfo mode

     *

     * @return array  an associative array with the information requested.

     *                 A DB_Error object on failure.

     *

     * @see DB_common::tableInfo()

     * @since Method available since Release 1.7.0

     */

    function tableInfo($result, $mode = null)

    {

        if (is_string($result)) {

            /*

             * Probably received a table name.

             * Create a result resource identifier.

             */

            $id = @odbc_exec($this->connection, "SELECT * FROM $result");

            if (!$id) {

                return $this->odbcRaiseError();

            }

            $got_string = true;

        } elseif (isset($result->result)) {

            /*

             * Probably received a result object.

             * Extract the result resource identifier.

             */

            $id = $result->result;

            $got_string = false;

        } else {

            /*

             * Probably received a result resource identifier.

             * Copy it.

             * Deprecated.  Here for compatibility only.

             */

            $id = $result;

            $got_string = false;

        }

        if (!is_resource($id)) {

            return $this->odbcRaiseError(DB_ERROR_NEED_MORE_DATA);

        }

        if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {

            $case_func = 'strtolower';

        } else {

            $case_func = 'strval';

        }

        $count = @odbc_num_fields($id);

        $res   = array();

        if ($mode) {

            $res['num_fields'] = $count;

        }

        for ($i = 0; $i < $count; $i++) {

            $col = $i + 1;

            $res[$i] = array(

                'table' => $got_string ? $case_func($result) : '',

                'name'  => $case_func(@odbc_field_name($id, $col)),

                'type'  => @odbc_field_type($id, $col),

                'len'   => @odbc_field_len($id, $col),

                'flags' => '',

            );

            if ($mode & DB_TABLEINFO_ORDER) {

                $res['order'][$res[$i]['name']] = $i;

            }

            if ($mode & DB_TABLEINFO_ORDERTABLE) {

                $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;

            }

        }

        // free the result only if we were called on a table

        if ($got_string) {

            @odbc_free_result($id);

        }

        return $res;

    }

    // }}}

    // {{{ getSpecialQuery()

    /**

     * Obtains the query string needed for listing a given type of objects

     *

     * Thanks to symbol1@gmail.com and Philippe.Jausions@11abacus.com.

     *

     * @param string $type  the kind of objects you want to retrieve

     *

     * @return string  the list of objects requested

     *

     * @access protected

     * @see DB_common::getListOf()

     * @since Method available since Release 1.7.0

     */

    function getSpecialQuery($type)

    {

        switch ($type) {

            case 'databases':

                if (!function_exists('odbc_data_source')) {

                    return null;

                }

                $res = @odbc_data_source($this->connection, SQL_FETCH_FIRST);

                if (is_array($res)) {

                    $out = array($res['server']);

                    while($res = @odbc_data_source($this->connection,

                                                   SQL_FETCH_NEXT))

                    {

                        $out[] = $res['server'];

                    }

                    return $out;

                } else {

                    return $this->odbcRaiseError();

                }

                break;

            case 'tables':

            case 'schema.tables':

                $keep = 'TABLE';

                break;

            case 'views':

                $keep = 'VIEW';

                break;

            default:

                return null;

        }

        /*

         * Removing non-conforming items in the while loop rather than

         * in the odbc_tables() call because some backends choke on this:

         *     odbc_tables($this->connection, '', '', '', 'TABLE')

         */

        $res  = @odbc_tables($this->connection);

        if (!$res) {

            return $this->odbcRaiseError();

        }

        $out = array();

        while ($row = odbc_fetch_array($res)) {

            if ($row['TABLE_TYPE'] != $keep) {

                continue;

            }

            if ($type == 'schema.tables') {

                $out[] = $row['TABLE_SCHEM'] . '.' . $row['TABLE_NAME'];

            } else {

                $out[] = $row['TABLE_NAME'];

            }

        }

        return $out;

    }

    // }}}

}

/*

 * Local variables:

 * tab-width: 4

 * c-basic-offset: 4

 * End:

 */

?>