WebSVN – Moodle – /lib/adodb/drivers/adodb-odbc.inc.php

<?php
/**
 * Base ODBC driver
 *
 * This file is part of ADOdb, a Database Abstraction Layer library for PHP.
 *
 * @package ADOdb
 * @link https://adodb.org Project's web site and documentation
 * @link https://github.com/ADOdb/ADOdb Source code and issue tracker
 *
 * The ADOdb Library is dual-licensed, released under both the BSD 3-Clause
 * and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,
 * any later version. This means you can use it in proprietary products.
 * See the LICENSE.md file distributed with this source code for details.
 * @license BSD-3-Clause
 * @license LGPL-2.1-or-later
 *
 * @copyright 2000-2013 John Lim
 * @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community
 */

// security - hide paths
if (!defined('ADODB_DIR')) die();

  define("_ADODB_ODBC_LAYER", 2 );

/*
 * These constants are used to set define MetaColumns() method's behavior.
 * - METACOLUMNS_RETURNS_ACTUAL makes the driver return the actual type,
 *   like all other drivers do (default)
 * - METACOLUMNS_RETURNS_META is provided for legacy compatibility (makes
 *   driver behave as it did prior to v5.21)
 *
 * @see $metaColumnsReturnType
 */
DEFINE('METACOLUMNS_RETURNS_ACTUAL', 0);
DEFINE('METACOLUMNS_RETURNS_META', 1);

/*--------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------*/


class ADODB_odbc extends ADOConnection {
        var $databaseType = "odbc";
        var $fmtDate = "'Y-m-d'";
        var $fmtTimeStamp = "'Y-m-d, h:i:sA'";
        var $replaceQuote = "''"; // string to use to replace quotes
        var $dataProvider = "odbc";
        var $hasAffectedRows = true;
        var $binmode = ODBC_BINMODE_RETURN;
        var $useFetchArray = false; // setting this to true will make array elements in FETCH_ASSOC mode case-sensitive
                                                                // breaking backward-compat
        //var $longreadlen = 8000; // default number of chars to return for a Blob/Long field
        var $_bindInputArray = false;
        var $curmode = SQL_CUR_USE_DRIVER; // See sqlext.h, SQL_CUR_DEFAULT == SQL_CUR_USE_DRIVER == 2L
        var $_genSeqSQL = "create table %s (id integer)";
        var $_autocommit = true;
        var $_lastAffectedRows = 0;
        var $uCaseTables = true; // for meta* functions, uppercase table names

        /*
         * Tells the metaColumns feature whether to return actual or meta type
         */
        public $metaColumnsReturnType = METACOLUMNS_RETURNS_ACTUAL;

        function __construct() {}

                // returns true or false
        function _connect($argDSN, $argUsername, $argPassword, $argDatabasename)
        {
                if (!function_exists('odbc_connect')) return null;

                if (!empty($argDatabasename) && stristr($argDSN, 'Database=') === false) {
                        $argDSN = trim($argDSN);
                        $endDSN = substr($argDSN, strlen($argDSN) - 1);
                        if ($endDSN != ';') $argDSN .= ';';
                        $argDSN .= 'Database='.$argDatabasename;
                }

                $last_php_error = $this->resetLastError();
                if ($this->curmode === false) $this->_connectionID = odbc_connect($argDSN,$argUsername,$argPassword);
                else $this->_connectionID = odbc_connect($argDSN,$argUsername,$argPassword,$this->curmode);
                $this->_errorMsg = $this->getChangedErrorMsg($last_php_error);
                if ($this->connectStmt) {
                        $this->Execute($this->connectStmt);
                }

                return $this->_connectionID != false;
        }

        // returns true or false
        function _pconnect($argDSN, $argUsername, $argPassword, $argDatabasename)
        {
                if (!function_exists('odbc_connect')) return null;

                $last_php_error = $this->resetLastError();
                $this->_errorMsg = '';
                if ($this->debug && $argDatabasename) {
                        ADOConnection::outp("For odbc PConnect(), $argDatabasename is not used. Place dsn in 1st parameter.");
                }
        //      print "dsn=$argDSN u=$argUsername p=$argPassword<br>"; flush();
                if ($this->curmode === false) $this->_connectionID = odbc_connect($argDSN,$argUsername,$argPassword);
                else $this->_connectionID = odbc_pconnect($argDSN,$argUsername,$argPassword,$this->curmode);

                $this->_errorMsg = $this->getChangedErrorMsg($last_php_error);
                if ($this->_connectionID && $this->autoRollback) @odbc_rollback($this->_connectionID);
                if ($this->connectStmt) {
                        $this->Execute($this->connectStmt);
                }

                return $this->_connectionID != false;
        }


        function ServerInfo()
        {

                if (!empty($this->host)) {
                        $dsn = strtoupper($this->host);
                        $first = true;
                        $found = false;

                        if (!function_exists('odbc_data_source')) return false;

                        while(true) {

                                $rez = @odbc_data_source($this->_connectionID,
                                        $first ? SQL_FETCH_FIRST : SQL_FETCH_NEXT);
                                $first = false;
                                if (!is_array($rez)) break;
                                if (strtoupper($rez['server']) == $dsn) {
                                        $found = true;
                                        break;
                                }
                        }
                        if (!$found) return ADOConnection::ServerInfo();
                        if (!isset($rez['version'])) $rez['version'] = '';
                        return $rez;
                } else {
                        return ADOConnection::ServerInfo();
                }
        }


        function CreateSequence($seqname='adodbseq',$start=1)
        {
                if (empty($this->_genSeqSQL)) return false;
                $ok = $this->Execute(sprintf($this->_genSeqSQL,$seqname));
                if (!$ok) return false;
                $start -= 1;
                return $this->Execute("insert into $seqname values($start)");
        }

        var $_dropSeqSQL = 'drop table %s';
        function DropSequence($seqname = 'adodbseq')
        {
                if (empty($this->_dropSeqSQL)) return false;
                return $this->Execute(sprintf($this->_dropSeqSQL,$seqname));
        }

        /*
                This algorithm is not very efficient, but works even if table locking
                is not available.

                Will return false if unable to generate an ID after $MAXLOOPS attempts.
        */
        function GenID($seq='adodbseq',$start=1)
        {
                // if you have to modify the parameter below, your database is overloaded,
                // or you need to implement generation of id's yourself!
                $MAXLOOPS = 100;
                //$this->debug=1;
                while (--$MAXLOOPS>=0) {
                        $num = $this->GetOne("select id from $seq");
                        if ($num === false) {
                                $this->Execute(sprintf($this->_genSeqSQL ,$seq));
                                $start -= 1;
                                $num = '0';
                                $ok = $this->Execute("insert into $seq values($start)");
                                if (!$ok) return false;
                        }
                        $this->Execute("update $seq set id=id+1 where id=$num");

                        if ($this->affected_rows() > 0) {
                                $num += 1;
                                $this->genID = $num;
                                return $num;
                        } elseif ($this->affected_rows() == 0) {
                                // some drivers do not return a valid value => try with another method
                                $value = $this->GetOne("select id from $seq");
                                if ($value == $num + 1) {
                                        return $value;
                                }
                        }
                }
                if ($fn = $this->raiseErrorFn) {
                        $fn($this->databaseType,'GENID',-32000,"Unable to generate unique id after $MAXLOOPS attempts",$seq,$num);
                }
                return false;
        }


        function ErrorMsg()
        {
                if ($this->_errorMsg !== false) return $this->_errorMsg;
                if (empty($this->_connectionID)) return @odbc_errormsg();
                return @odbc_errormsg($this->_connectionID);
        }

        function ErrorNo()
        {
                if ($this->_errorCode !== false) {
                        // bug in 4.0.6, error number can be corrupted string (should be 6 digits)
                        return (strlen($this->_errorCode)<=2) ? 0 : $this->_errorCode;
                }

                if (empty($this->_connectionID)) $e = @odbc_error();
                else $e = @odbc_error($this->_connectionID);

                 // bug in 4.0.6, error number can be corrupted string (should be 6 digits)
                 // so we check and patch
                if (strlen($e)<=2) return 0;
                return $e;
        }



        function BeginTrans()
        {
                if (!$this->hasTransactions) return false;
                if ($this->transOff) return true;
                $this->transCnt += 1;
                $this->_autocommit = false;
                return odbc_autocommit($this->_connectionID,false);
        }

        function CommitTrans($ok=true)
        {
                if ($this->transOff) return true;
                if (!$ok) return $this->RollbackTrans();
                if ($this->transCnt) $this->transCnt -= 1;
                $this->_autocommit = true;
                $ret = odbc_commit($this->_connectionID);
                odbc_autocommit($this->_connectionID,true);
                return $ret;
        }

        function RollbackTrans()
        {
                if ($this->transOff) return true;
                if ($this->transCnt) $this->transCnt -= 1;
                $this->_autocommit = true;
                $ret = odbc_rollback($this->_connectionID);
                odbc_autocommit($this->_connectionID,true);
                return $ret;
        }

        function MetaPrimaryKeys($table,$owner=false)
        {
        global $ADODB_FETCH_MODE;

                if ($this->uCaseTables) $table = strtoupper($table);
                $schema = '';
                $this->_findschema($table,$schema);

                $savem = $ADODB_FETCH_MODE;
                $ADODB_FETCH_MODE = ADODB_FETCH_NUM;
                $qid = @odbc_primarykeys($this->_connectionID,'',$schema,$table);

                if (!$qid) {
                        $ADODB_FETCH_MODE = $savem;
                        return false;
                }
                $rs = new ADORecordSet_odbc($qid);
                $ADODB_FETCH_MODE = $savem;

                if (!$rs) return false;

                $arr = $rs->GetArray();
                $rs->Close();
                //print_r($arr);
                $arr2 = array();
                for ($i=0; $i < sizeof($arr); $i++) {
                        if ($arr[$i][3]) $arr2[] = $arr[$i][3];
                }
                return $arr2;
        }



        function MetaTables($ttype=false,$showSchema=false,$mask=false)
        {
        global $ADODB_FETCH_MODE;

                $savem = $ADODB_FETCH_MODE;
                $ADODB_FETCH_MODE = ADODB_FETCH_NUM;
                $qid = odbc_tables($this->_connectionID);

                $rs = new ADORecordSet_odbc($qid);

                $ADODB_FETCH_MODE = $savem;
                if (!$rs) {
                        $false = false;
                        return $false;
                }

                $arr = $rs->GetArray();
                //print_r($arr);

                $rs->Close();
                $arr2 = array();

                if ($ttype) {
                        $isview = strncmp($ttype,'V',1) === 0;
                }
                for ($i=0; $i < sizeof($arr); $i++) {
                        if (!$arr[$i][2]) continue;
                        $type = $arr[$i][3];
                        if ($ttype) {
                                if ($isview) {
                                        if (strncmp($type,'V',1) === 0) $arr2[] = $arr[$i][2];
                                } else if (strncmp($type,'SYS',3) !== 0) $arr2[] = $arr[$i][2];
                        } else if (strncmp($type,'SYS',3) !== 0) $arr2[] = $arr[$i][2];
                }
                return $arr2;
        }

/*
See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odbc/htm/odbcdatetime_data_type_changes.asp
/ SQL data type codes /
#define SQL_UNKNOWN_TYPE        0
#define SQL_CHAR                        1
#define SQL_NUMERIC              2
#define SQL_DECIMAL              3
#define SQL_INTEGER              4
#define SQL_SMALLINT            5
#define SQL_FLOAT                  6
#define SQL_REAL                        7
#define SQL_DOUBLE                8
#if (ODBCVER >= 0x0300)
#define SQL_DATETIME            9
#endif
#define SQL_VARCHAR             12


/ One-parameter shortcuts for date/time data types /
#if (ODBCVER >= 0x0300)
#define SQL_TYPE_DATE     91
#define SQL_TYPE_TIME     92
#define SQL_TYPE_TIMESTAMP 93

#define SQL_UNICODE                             (-95)
#define SQL_UNICODE_VARCHAR                     (-96)
#define SQL_UNICODE_LONGVARCHAR                 (-97)
*/
        function ODBCTypes($t)
        {
                switch ((integer)$t) {
                case 1:
                case 12:
                case 0:
                case -95:
                case -96:
                        return 'C';
                case -97:
                case -1: //text
                        return 'X';
                case -4: //image
                        return 'B';

                case 9:
                case 91:
                        return 'D';

                case 10:
                case 11:
                case 92:
                case 93:
                        return 'T';

                case 4:
                case 5:
                case -6:
                        return 'I';

                case -11: // uniqidentifier
                        return 'R';
                case -7: //bit
                        return 'L';

                default:
                        return 'N';
                }
        }

        function MetaColumns($table, $normalize=true)
        {
        global $ADODB_FETCH_MODE;

                $false = false;
                if ($this->uCaseTables) $table = strtoupper($table);
                $schema = '';
                $this->_findschema($table,$schema);

                $savem = $ADODB_FETCH_MODE;
                $ADODB_FETCH_MODE = ADODB_FETCH_NUM;

                /*if (false) { // after testing, confirmed that the following does not work because of a bug
                        $qid2 = odbc_tables($this->_connectionID);
                        $rs = new ADORecordSet_odbc($qid2);
                        $ADODB_FETCH_MODE = $savem;
                        if (!$rs) return false;
                        $rs->_fetch();

                        while (!$rs->EOF) {
                                if ($table == strtoupper($rs->fields[2])) {
                                        $q = $rs->fields[0];
                                        $o = $rs->fields[1];
                                        break;
                                }
                                $rs->MoveNext();
                        }
                        $rs->Close();

                        $qid = odbc_columns($this->_connectionID,$q,$o,strtoupper($table),'%');
                } */

                switch ($this->databaseType) {
                case 'access':
                case 'vfp':
                        $qid = odbc_columns($this->_connectionID);#,'%','',strtoupper($table),'%');
                        break;


                case 'db2':
            $colname = "%";
            $qid = odbc_columns($this->_connectionID, "", $schema, $table, $colname);
            break;

                default:
                        $qid = @odbc_columns($this->_connectionID,'%','%',strtoupper($table),'%');
                        if (empty($qid)) $qid = odbc_columns($this->_connectionID);
                        break;
                }
                if (empty($qid)) return $false;

                $rs = new ADORecordSet_odbc($qid);
                $ADODB_FETCH_MODE = $savem;

                if (!$rs) return $false;
                $rs->_fetch();

                $retarr = array();

                /*
                $rs->fields indices
                0 TABLE_QUALIFIER
                1 TABLE_SCHEM
                2 TABLE_NAME
                3 COLUMN_NAME
                4 DATA_TYPE
                5 TYPE_NAME
                6 PRECISION
                7 LENGTH
                8 SCALE
                9 RADIX
                10 NULLABLE
                11 REMARKS
                */
                while (!$rs->EOF) {
                //      adodb_pr($rs->fields);
                        if (strtoupper(trim($rs->fields[2])) == $table && (!$schema || strtoupper($rs->fields[1]) == $schema)) {
                                $fld = new ADOFieldObject();
                                $fld->name = $rs->fields[3];
                                if ($this->metaColumnsReturnType == METACOLUMNS_RETURNS_META)
                                        /*
                                    * This is the broken, original value
                                        */
                                        $fld->type = $this->ODBCTypes($rs->fields[4]);
                                else
                                        /*
                                    * This is the correct new value
                                        */
                                    $fld->type = $rs->fields[4];

                                // ref: http://msdn.microsoft.com/library/default.asp?url=/archive/en-us/dnaraccgen/html/msdn_odk.asp
                                // access uses precision to store length for char/varchar
                                if ($fld->type == 'C' or $fld->type == 'X') {
                                        if ($this->databaseType == 'access')
                                                $fld->max_length = $rs->fields[6];
                                        else if ($rs->fields[4] <= -95) // UNICODE
                                                $fld->max_length = $rs->fields[7]/2;
                                        else
                                                $fld->max_length = $rs->fields[7];
                                } else
                                        $fld->max_length = $rs->fields[7];
                                $fld->not_null = !empty($rs->fields[10]);
                                $fld->scale = $rs->fields[8];
                                $retarr[strtoupper($fld->name)] = $fld;
                        } else if (sizeof($retarr)>0)
                                break;
                        $rs->MoveNext();
                }
                $rs->Close(); //-- crashes 4.03pl1 -- why?

                if (empty($retarr)) $retarr = false;
                return $retarr;
        }

        function Prepare($sql)
        {
                if (! $this->_bindInputArray) return $sql; // no binding
                $stmt = odbc_prepare($this->_connectionID,$sql);
                if (!$stmt) {
                        // we don't know whether odbc driver is parsing prepared stmts, so just return sql
                        return $sql;
                }
                return array($sql,$stmt,false);
        }

        function _query($sql,$inputarr=false)
        {
                $last_php_error = $this->resetLastError();
                $this->_errorMsg = '';

                if ($inputarr) {
                        if (is_array($sql)) {
                                $stmtid = $sql[1];
                        } else {
                                $stmtid = odbc_prepare($this->_connectionID,$sql);

                                if ($stmtid == false) {
                                        $this->_errorMsg = $this->getChangedErrorMsg($last_php_error);
                                        return false;
                                }
                        }

                        if (! odbc_execute($stmtid,$inputarr)) {
                                //@odbc_free_result($stmtid);
                                $this->_errorMsg = odbc_errormsg();
                                $this->_errorCode = odbc_error();
                                return false;
                        }

                } else if (is_array($sql)) {
                        $stmtid = $sql[1];
                        if (!odbc_execute($stmtid)) {
                                //@odbc_free_result($stmtid);
                                $this->_errorMsg = odbc_errormsg();
                                $this->_errorCode = odbc_error();
                                return false;
                        }
                } else
                        $stmtid = odbc_exec($this->_connectionID,$sql);

                $this->_lastAffectedRows = 0;
                if ($stmtid) {
                        if (@odbc_num_fields($stmtid) == 0) {
                                $this->_lastAffectedRows = odbc_num_rows($stmtid);
                                $stmtid = true;
                        } else {
                                $this->_lastAffectedRows = 0;
                                odbc_binmode($stmtid,$this->binmode);
                                odbc_longreadlen($stmtid,$this->maxblobsize);
                        }

                        $this->_errorMsg = '';
                        $this->_errorCode = 0;
                } else {
                        $this->_errorMsg = odbc_errormsg();
                        $this->_errorCode = odbc_error();
                }
                return $stmtid;
        }

        /*
                Insert a null into the blob field of the table first.
                Then use UpdateBlob to store the blob.

                Usage:

                $conn->Execute('INSERT INTO blobtable (id, blobcol) VALUES (1, null)');
                $conn->UpdateBlob('blobtable','blobcol',$blob,'id=1');
        */
        function UpdateBlob($table,$column,$val,$where,$blobtype='BLOB')
        {
                return $this->Execute("UPDATE $table SET $column=? WHERE $where",array($val)) != false;
        }

        // returns true or false
        function _close()
        {
                $ret = @odbc_close($this->_connectionID);
                $this->_connectionID = false;
                return $ret;
        }

        function _affectedrows()
        {
                return $this->_lastAffectedRows;
        }

}

/*--------------------------------------------------------------------------------------
         Class Name: Recordset
--------------------------------------------------------------------------------------*/

class ADORecordSet_odbc extends ADORecordSet {

        var $bind = false;
        var $databaseType = "odbc";
        var $dataProvider = "odbc";
        var $useFetchArray;

        function __construct($id,$mode=false)
        {
                if ($mode === false) {
                        global $ADODB_FETCH_MODE;
                        $mode = $ADODB_FETCH_MODE;
                }
                $this->fetchMode = $mode;

                $this->_queryID = $id;

                // the following is required for mysql odbc driver in 4.3.1 -- why?
                $this->EOF = false;
                $this->_currentRow = -1;
                //parent::__construct($id);
        }


        // returns the field object
        function FetchField($fieldOffset = -1)
        {

                $off=$fieldOffset+1; // offsets begin at 1

                $o= new ADOFieldObject();
                $o->name = @odbc_field_name($this->_queryID,$off);
                $o->type = @odbc_field_type($this->_queryID,$off);
                $o->max_length = @odbc_field_len($this->_queryID,$off);
                if (ADODB_ASSOC_CASE == 0) $o->name = strtolower($o->name);
                else if (ADODB_ASSOC_CASE == 1) $o->name = strtoupper($o->name);
                return $o;
        }

        /* Use associative array to get fields array */
        function Fields($colname)
        {
                if ($this->fetchMode & ADODB_FETCH_ASSOC) return $this->fields[$colname];
                if (!$this->bind) {
                        $this->bind = array();
                        for ($i=0; $i < $this->_numOfFields; $i++) {
                                $o = $this->FetchField($i);
                                $this->bind[strtoupper($o->name)] = $i;
                        }
                }

                 return $this->fields[$this->bind[strtoupper($colname)]];
        }


        function _initrs()
        {
        global $ADODB_COUNTRECS;
                $this->_numOfRows = ($ADODB_COUNTRECS) ? @odbc_num_rows($this->_queryID) : -1;
                $this->_numOfFields = @odbc_num_fields($this->_queryID);
                // some silly drivers such as db2 as/400 and intersystems cache return _numOfRows = 0
                if ($this->_numOfRows == 0) $this->_numOfRows = -1;
                //$this->useFetchArray = $this->connection->useFetchArray;
        }

        function _seek($row)
        {
                return false;
        }

        // speed up SelectLimit() by switching to ADODB_FETCH_NUM as ADODB_FETCH_ASSOC is emulated
        function GetArrayLimit($nrows,$offset=-1)
        {
                if ($offset <= 0) {
                        $rs = $this->GetArray($nrows);
                        return $rs;
                }
                $savem = $this->fetchMode;
                $this->fetchMode = ADODB_FETCH_NUM;
                $this->Move($offset);
                $this->fetchMode = $savem;

                if ($this->fetchMode & ADODB_FETCH_ASSOC) {
                        $this->fields = $this->GetRowAssoc();
                }

                $results = array();
                $cnt = 0;
                while (!$this->EOF && $nrows != $cnt) {
                        $results[$cnt++] = $this->fields;
                        $this->MoveNext();
                }

                return $results;
        }


        function MoveNext()
        {
                if ($this->_numOfRows != 0 && !$this->EOF) {
                        $this->_currentRow++;
                        if( $this->_fetch() ) {
                                return true;
                        }
                }
                $this->fields = false;
                $this->EOF = true;
                return false;
        }

        function _fetch()
        {
                $this->fields = false;
                $rez = @odbc_fetch_into($this->_queryID,$this->fields);
                if ($rez) {
                        if ($this->fetchMode & ADODB_FETCH_ASSOC) {
                                $this->fields = $this->GetRowAssoc();
                        }
                        return true;
                }
                return false;
        }

        function _close()
        {
                return @odbc_free_result($this->_queryID);
        }

}
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