<?php
/*
* OIDplus 2.0
* Copyright 2019 - 2022 Daniel Marschall, ViaThinkSoft
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace ViaThinkSoft\OIDplus;
class OIDplusDatabaseConnectionODBC extends OIDplusDatabaseConnection {
private $conn;
private $last_error = null; // do the same like MySQL+PDO, just to be equal in the behavior
private $transactions_supported = false;
protected function forcePrepareEmulation() {
$mode = OIDplus::baseConfig()->getValue('PREPARED_STATEMENTS_EMULATION', 'auto');
if ($mode === 'on') return true;
if ($mode === 'off') return false;
static $res = null;
$sql = 'select name from ###config where name = ?';
$sql = str_replace('###', OIDplus
::baseConfig()->getValue('TABLENAME_PREFIX', ''), $sql); }
return $res;
}
protected function doQueryInternalPrepare(string $sql, /*?array*/ $prepared_args=null): OIDplusQueryResult {
foreach ($prepared_args as &$value) {
// ODBC/SQLServer has problems converting "true" to the data type "bit"
// Error "Invalid character value for cast specification"
if ($this->slangDetectionDone) {
$value = $this->getSlang()->getSQLBool($value);
} else {
$value = $value ? '1' : '0';
}
}
}
if (!$ps) {
// If preparation fails, try the emulation
// For example, SQL Server ODBC Driver cannot have "?" in a subquery,
// otherwise you receive the error message
// "Syntax error or access violation" on odbc_prepare()
return $this->doQueryPrepareEmulation($sql, $prepared_args);
/*
$this->last_error = odbc_errormsg($this->conn);
throw new OIDplusSQLException($sql, _L('Cannot prepare statement').': '.$this->error());
*/
}
throw new OIDplusSQLException($sql, $this->error());
}
return new OIDplusQueryResultODBC($ps);
}
protected function doQueryPrepareEmulation(string $sql, /*?array*/ $prepared_args=null): OIDplusQueryResult {
// For some drivers (e.g. Microsoft Access), we need to do this kind of emulation, because odbc_prepare() does not work
foreach ($prepared_args as $arg) {
if ($this->slangDetectionDone) {
$replace = $this->getSlang()->getSQLBool($arg);
} else {
$replace = $arg ? '1' : '0';
}
} else {
if ($this->slangDetectionDone) {
$replace = "'".$this->getSlang()->escapeString($arg)."'"; // TODO: types
} else {
$replace = "'".str_replace("'", "''", $arg)."'"; // TODO: types }
}
if ($pos !== false) {
}
}
if (!$ps) {
throw new OIDplusSQLException($sql, _L('Cannot prepare statement').': '.$this->error());
}
return new OIDplusQueryResultODBC($ps);
}
public function doQuery(string $sql, /*?array*/ $prepared_args=null): OIDplusQueryResult {
$this->last_error = null;
if ($res === false) {
throw new OIDplusSQLException($sql, $this->error());
} else {
return new OIDplusQueryResultODBC($res);
}
} else {
throw new OIDplusException(_L('"prepared_args" must be either NULL or an ARRAY.'));
}
if ($this->forcePrepareEmulation()) {
return $this->doQueryPrepareEmulation($sql, $prepared_args);
} else {
return $this->doQueryInternalPrepare($sql, $prepared_args);
}
}
}
public function error(): string {
$err = $this->last_error;
if ($err == null) $err = '';
$err = vts_utf8_encode($err); // because ODBC might output weird stuff ...
return $err;
}
protected function doConnect()/*: void*/ {
if (!function_exists('odbc_connect')) throw new OIDplusConfigInitializationException
(_L
('PHP extension "%1" not installed','ODBC'));
// Try connecting to the database
$dsn = OIDplus::baseConfig()->getValue('ODBC_DSN', 'DRIVER={SQL Server};SERVER=localhost;DATABASE=oidplus;CHARSET=UTF8');
$username = OIDplus::baseConfig()->getValue('ODBC_USERNAME', '');
$password = OIDplus::baseConfig()->getValue('ODBC_PASSWORD', '');
if (!$this->conn) {
throw new OIDplusConfigInitializationException
(trim(_L
('Connection to the database failed!').' '.$message)); }
$this->last_error = null;
try {
@odbc_exec($this->conn, "SET NAMES 'utf8'"); // Does most likely NOT work with ODBC. Try adding ";CHARSET=UTF8" (or similar) to the DSN } catch (\Exception $e) {
}
// We check if the DBMS supports autocommit.
// Attention: Check it after you have sent a query already, because Microsoft Access doesn't seem to allow
// changing auto commit once a query was executed ("Attribute cannot be set now SQLState: S1011")
// Note: For some weird reason we *DO* need to redirect the output to "$dummy", otherwise it won't work!
$sql = "select name from ###config where 1=0";
$sql = str_replace('###', OIDplus
::baseConfig()->getValue('TABLENAME_PREFIX', ''), $sql); }
protected function doDisconnect()/*: void*/ {
$this->conn = null;
}
}
private $intransaction = false;
public function transaction_supported(): bool {
return $this->transactions_supported;
}
public function transaction_level(): int {
if (!$this->transaction_supported()) {
// TODO?
return 0;
}
return $this->intransaction ? 1 : 0;
}
public function transaction_begin()/*: void*/ {
if (!$this->transaction_supported()) {
// TODO?
return;
}
if ($this->intransaction) throw new OIDplusException(_L('Nested transactions are not supported by this database plugin.'));
$this->intransaction = true;
}
public function transaction_commit()/*: void*/ {
if (!$this->transaction_supported()) {
// TODO?
return;
}
$this->intransaction = false;
}
public function transaction_rollback()/*: void*/ {
if (!$this->transaction_supported()) {
// TODO?
return;
}
$this->intransaction = false;
}
}