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<?php
/**
 * PDO Firebird driver
 *
 * This version has only been tested on Firebird 3.0 and PHP 7
 *
 * 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 2019 Damien Regad, Mark Newnham and the ADOdb community
 */

/**
 * Class ADODB_pdo_firebird
 */
class ADODB_pdo_firebird extends ADODB_pdo
{
	public $dialect = 3;
	public $metaTablesSQL = "select lower(rdb\$relation_name) from rdb\$relations where rdb\$relation_name not like 'RDB\$%'";
	public $metaColumnsSQL = "select lower(a.rdb\$field_name), a.rdb\$null_flag, a.rdb\$default_source, b.rdb\$field_length, b.rdb\$field_scale, b.rdb\$field_sub_type, b.rdb\$field_precision, b.rdb\$field_type from rdb\$relation_fields a, rdb\$fields b where a.rdb\$field_source = b.rdb\$field_name and a.rdb\$relation_name = '%s' order by a.rdb\$field_position asc";

var $arrayClass = 'ADORecordSet_array_pdo_firebird';

/**
	 * Gets the version iformation from the server
	 *
	 * @return string[]
	 */
	public function serverInfo()
	{
		$arr['dialect'] = $this->dialect;
		switch ($arr['dialect']) {
			case '':
			case '1':
				$s = 'Firebird Dialect 1';
				break;
			case '2':
				$s = 'Firebird Dialect 2';
				break;
			default:
			case '3':
				$s = 'Firebird Dialect 3';
				break;
		}
		$arr['version'] = ADOConnection::_findvers($s);
		$arr['description'] = $s;
		return $arr;
	}

/**
	 * Returns the tables in the database.
	 *
	 * @param mixed $ttype
	 * @param bool  $showSchema
	 * @param mixed $mask
	 *
	 * @return    string[]
	 */
	public function metaTables($ttype = false, $showSchema = false, $mask = false)
	{
		$ret = ADOConnection::MetaTables($ttype, $showSchema);

return $ret;
	}

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

$save = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;

$rs = $this->Execute(sprintf($this->metaColumnsSQL, strtoupper($table)));

$ADODB_FETCH_MODE = $save;

if ($rs === false) {
			return false;
		}

$retarr = array();
		$dialect3 = $this->dialect == 3;
		while (!$rs->EOF) { //print_r($rs->fields);
			$fld = new ADOFieldObject();
			$fld->name = trim($rs->fields[0]);
			$this->_ConvertFieldType($fld, $rs->fields[7], $rs->fields[3], $rs->fields[4], $rs->fields[5],
				$rs->fields[6], $dialect3);
			if (isset($rs->fields[1]) && $rs->fields[1]) {
				$fld->not_null = true;
			}
			if (isset($rs->fields[2])) {

$fld->has_default = true;
				$d = substr($rs->fields[2], strlen('default '));
				switch ($fld->type) {
					case 'smallint':
					case 'integer':
						$fld->default_value = (int)$d;
						break;
					case 'char':
					case 'blob':
					case 'text':
					case 'varchar':
						$fld->default_value = (string)substr($d, 1, strlen($d) - 2);
						break;
					case 'double':
					case 'float':
						$fld->default_value = (float)$d;
						break;
					default:
						$fld->default_value = $d;
						break;
				}
			}
			if ((isset($rs->fields[5])) && ($fld->type == 'blob')) {
				$fld->sub_type = $rs->fields[5];
			} else {
				$fld->sub_type = null;
			}
			if ($ADODB_FETCH_MODE == ADODB_FETCH_NUM) {
				$retarr[] = $fld;
			} else {
				$retarr[strtoupper($fld->name)] = $fld;
			}

$rs->MoveNext();
		}
		$rs->Close();
		if (empty($retarr)) {
			return false;
		} else {
			return $retarr;
		}
	}

public function metaIndexes($table, $primary = false, $owner = false)
	{
		// save old fetch mode
		global $ADODB_FETCH_MODE;
		$save = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
		if ($this->fetchMode !== false) {
			$savem = $this->SetFetchMode(false);
		}
		$table = strtoupper($table);
		$sql = "SELECT * FROM RDB\$INDICES WHERE RDB\$RELATION_NAME = '" . $table . "'";
		if (!$primary) {
			$sql .= " AND RDB\$INDEX_NAME NOT LIKE 'RDB\$%'";
		} else {
			$sql .= " AND RDB\$INDEX_NAME NOT LIKE 'RDB\$FOREIGN%'";
		}

// get index details
		$rs = $this->Execute($sql);
		if (!is_object($rs)) {
			// restore fetchmode
			if (isset($savem)) {
				$this->SetFetchMode($savem);
			}
			$ADODB_FETCH_MODE = $save;
			return false;
		}

$indexes = array();
		while ($row = $rs->FetchRow()) {
			$index = $row[0];
			if (!isset($indexes[$index])) {
				if (is_null($row[3])) {
					$row[3] = 0;
				}
				$indexes[$index] = array(
					'unique' => ($row[3] == 1),
					'columns' => array()
				);
			}
			$sql = "SELECT * FROM RDB\$INDEX_SEGMENTS WHERE RDB\$INDEX_NAME = '" . $index . "' ORDER BY RDB\$FIELD_POSITION ASC";
			$rs1 = $this->Execute($sql);
			while ($row1 = $rs1->FetchRow()) {
				$indexes[$index]['columns'][$row1[2]] = $row1[1];
			}
		}
		// restore fetchmode
		if (isset($savem)) {
			$this->SetFetchMode($savem);
		}
		$ADODB_FETCH_MODE = $save;

return $indexes;
	}

public function metaPrimaryKeys($table, $owner_notused = false, $internalKey = false)
	{
		if ($internalKey) {
			return array('RDB$DB_KEY');
		}

$table = strtoupper($table);

$sql = 'SELECT S.RDB$FIELD_NAME AFIELDNAME
	FROM RDB$INDICES I JOIN RDB$INDEX_SEGMENTS S ON I.RDB$INDEX_NAME=S.RDB$INDEX_NAME
	WHERE I.RDB$RELATION_NAME=\'' . $table . '\' and I.RDB$INDEX_NAME like \'RDB$PRIMARY%\'
	ORDER BY I.RDB$INDEX_NAME,S.RDB$FIELD_POSITION';

$a = $this->GetCol($sql, false, true);
		if ($a && sizeof($a) > 0) {
			return $a;
		}
		return false;
	}

public function createSequence($seqname = 'adodbseq', $startID = 1)
	{
		$ok = $this->execute("CREATE SEQUENCE $seqname");
		if (!$ok) {
			return false;
		}

return $this->execute("ALTER SEQUENCE $seqname RESTART WITH " . ($startID - 1));
	}

public function dropSequence($seqname = 'adodbseq')
	{
		$seqname = strtoupper($seqname);
		return $this->Execute("DROP SEQUENCE $seqname");
	}

public function genId($seqname = 'adodbseq', $startID = 1)
	{
		$getnext = ("SELECT Gen_ID($seqname,1) FROM RDB\$DATABASE");
		$rs = @$this->execute($getnext);
		if (!$rs) {
			$this->execute(("CREATE SEQUENCE $seqname"));
			$this->execute("ALTER SEQUENCE $seqname RESTART WITH " . ($startID - 1) . ';');
			$rs = $this->execute($getnext);
		}
		if ($rs && !$rs->EOF) {
			$this->genID = (integer)reset($rs->fields);
		} else {
			$this->genID = 0; // false
		}

if ($rs) {
			$rs->Close();
		}

return $this->genID;
	}

public function selectLimit($sql, $nrows = -1, $offset = -1, $inputarr = false, $secs = 0)
	{
		$nrows = (integer)$nrows;
		$offset = (integer)$offset;
		$str = 'SELECT ';
		if ($nrows >= 0) {
			$str .= "FIRST $nrows ";
		}
		$str .= ($offset >= 0) ? "SKIP $offset " : '';

$sql = preg_replace('/^[ \t]*select/i', $str, $sql);
		if ($secs) {
			$rs = $this->cacheExecute($secs, $sql, $inputarr);
		} else {
			$rs = $this->execute($sql, $inputarr);
		}

return $rs;
	}

/**
	 * Sets the appropriate type into the $fld variable
	 *
	 * @param ADOFieldObject $fld By reference
	 * @param int            $ftype
	 * @param int            $flen
	 * @param int            $fscale
	 * @param int            $fsubtype
	 * @param int            $fprecision
	 * @param bool           $dialect3
	 */
	private function _convertFieldType(&$fld, $ftype, $flen, $fscale, $fsubtype, $fprecision, $dialect3)
	{
		$fscale = abs($fscale);
		$fld->max_length = $flen;
		$fld->scale = null;
		switch ($ftype) {
			case 7:
			case 8:
				if ($dialect3) {
					switch ($fsubtype) {
						case 0:
							$fld->type = ($ftype == 7 ? 'smallint' : 'integer');
							break;
						case 1:
							$fld->type = 'numeric';
							$fld->max_length = $fprecision;
							$fld->scale = $fscale;
							break;
						case 2:
							$fld->type = 'decimal';
							$fld->max_length = $fprecision;
							$fld->scale = $fscale;
							break;
					} // switch
				} else {
					if ($fscale != 0) {
						$fld->type = 'decimal';
						$fld->scale = $fscale;
						$fld->max_length = ($ftype == 7 ? 4 : 9);
					} else {
						$fld->type = ($ftype == 7 ? 'smallint' : 'integer');
					}
				}
				break;
			case 16:
				if ($dialect3) {
					switch ($fsubtype) {
						case 0:
							$fld->type = 'decimal';
							$fld->max_length = 18;
							$fld->scale = 0;
							break;
						case 1:
							$fld->type = 'numeric';
							$fld->max_length = $fprecision;
							$fld->scale = $fscale;
							break;
						case 2:
							$fld->type = 'decimal';
							$fld->max_length = $fprecision;
							$fld->scale = $fscale;
							break;
					} // switch
				}
				break;
			case 10:
				$fld->type = 'float';
				break;
			case 14:
				$fld->type = 'char';
				break;
			case 27:
				if ($fscale != 0) {
					$fld->type = 'decimal';
					$fld->max_length = 15;
					$fld->scale = 5;
				} else {
					$fld->type = 'double';
				}
				break;
			case 35:
				if ($dialect3) {
					$fld->type = 'timestamp';
				} else {
					$fld->type = 'date';
				}
				break;
			case 12:
				$fld->type = 'date';
				break;
			case 13:
				$fld->type = 'time';
				break;
			case 37:
				$fld->type = 'varchar';
				break;
			case 40:
				$fld->type = 'cstring';
				break;
			case 261:
				$fld->type = 'blob';
				$fld->max_length = -1;
				break;
		} // switch
	}
}

/**
 * Class ADORecordSet_pdo_firebird
 */
class ADORecordSet_pdo_firebird extends ADORecordSet_pdo
{

public $databaseType = "pdo_firebird";

/**
	 * returns the field object
	 *
	 * @param int $fieldOffset Optional field offset
	 *
	 * @return object The ADOFieldObject describing the field
	 */
	public function fetchField($fieldOffset = 0)
	{
	}
}

/**
 * Class ADORecordSet_array_pdo_firebird
 */
class ADORecordSet_array_pdo_firebird extends ADORecordSet_array_pdo
{
	public $databaseType = "pdo_firebird";
	public $canSeek = true;

$fld = new ADOFieldObject;
		$fld->name = $fieldOffset;
		$fld->type = 'C';
		$fld->max_length = 0;

// This needs to be populated from the metadata
		$fld->not_null = false;
		$fld->has_default = false;
		$fld->default_value = 'null';

return $fld;
	}
}

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