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<?php
namespace PicoDb\Driver;
use PDO;
/**
* Microsoft SQL Server Driver
*
* @package PicoDb\Driver
* @author Algy Taylor <thomas.taylor@cmft.nhs.uk>
*/
class Mssql extends Base
{
/**
* List of required settings options
*
* @access protected
* @var array
*/
protected $requiredAttributes = array(
);
/**
* Constructor
*
* @access public
* @param array $settings
*/
public function __construct(array $settings)
{
parent::__construct($settings);
$this->useTop = true;
}
/**
* Table to store the schema version
*
* @access private
* @var array
*/
private $schemaTable = 'schema_version';
/**
* Create a new PDO connection
*
* @access public
* @param array $settings
*/
public function createConnection(array $settings)
{
$dsn = $settings['driver'] . ':';
// exactly one of hostname/DSN needed, port is optional
if ($settings['driver'] == 'odbc') {
$dsn .= $settings['odbc-dsn'];
} else {
if ($settings['driver'] == 'dblib') {
$dsn .= 'host=' . $settings['hostname'];
} elseif ($settings['driver'] == 'sqlsrv') {
$dsn .= 'Server=' . $settings['hostname'];
}
if (! empty($settings['port'])) {
$dsn .= ',' . $settings['port'];
}
}
if (! empty($settings['database'])) {
if ($settings['driver'] == 'dblib') {
$dsn .= ';dbname=' . $settings['database'];
} elseif ($settings['driver'] == 'sqlsrv') {
$dsn .= ';Database=' . $settings['database'];
}
}
if (! empty($settings['appname'])) {
if ($settings['driver'] == 'dblib') {
$dsn .= ';appname=' . $settings['appname'];
} elseif ($settings['driver'] == 'sqlsrv') {
$dsn .= ';APP=' . $settings['appname'];
}
}
// create PDO object
if (! empty($settings['username'])) {
$this->pdo = new PDO($dsn, $settings['username'], $settings['password']);
} else {
$this->pdo = new PDO($dsn);
}
if (isset($settings['schema_table'])) {
$this->schemaTable = $settings['schema_table'];
}
}
/**
* Enable foreign keys
*
* @access public
*/
public function enableForeignKeys()
{
$this->pdo->exec('EXEC sp_MSforeachtable @command1="ALTER TABLE ? CHECK CONSTRAINT ALL";');
}
/**
* Disable foreign keys
*
* @access public
*/
public function disableForeignKeys()
{
$this->pdo->exec('EXEC sp_MSforeachtable @command1="ALTER TABLE ? NOCHECK CONSTRAINT ALL";');
}
/**
* Return true if the error code is a duplicate key
*
* @access public
* @param integer $code
* @return boolean
*/
public function isDuplicateKeyError($code)
{
# 2601: Cannot insert duplicate key row in object '%.*ls' with unique index '%.*ls'.
# 2627: Violation of %ls constraint '%.*ls'. Cannot insert duplicate key in object '%.*ls'.
# 23000: Integrity constraint violation
return array_search($code, ['2601','2627','23000']) !== false;
}
/**
* Escape identifier
*
* https://msdn.microsoft.com/en-us/library/ms175874.aspx
*
* @access public
* @param string $identifier
* @return string
*/
public function escape($identifier)
{
return '['.str_replace("]","]]",$identifier).']';
}
/**
* Get non standard operator
*
* @access public
* @param string $operator
* @return string
*/
public function getOperator($operator)
{
if ($operator === 'LIKE' || $operator === 'ILIKE') {
return 'LIKE';
}
return '';
}
/**
* Get last inserted id
*
* @access public
* @return integer
*/
public function getLastId()
{
try {
$rq = $this->pdo->prepare('SELECT @@IDENTITY');
$rq->execute();
return $rq->fetchColumn();
}
catch (PDOException $e) {
return 0;
}
}
/**
* Get current schema version
*
* @access public
* @return integer
*/
public function getSchemaVersion()
{
$this->pdo->exec("
IF OBJECT_ID(N'dbo.".$this->schemaTable."', N'U') IS NULL
CREATE TABLE dbo.".$this->schemaTable." (
version INT DEFAULT '0'
);
");
$rq = $this->pdo->prepare('SELECT version FROM dbo.'.$this->schemaTable.'');
$rq->execute();
$result = $rq->fetchColumn();
if ($result !== false) {
return (int) $result;
}
else {
$this->pdo->exec('INSERT INTO dbo.'.$this->schemaTable.' (version) VALUES(0)');
}
return 0;
}
/**
* Set current schema version
*
* @access public
* @param integer $version
*/
public function setSchemaVersion($version)
{
$rq = $this->pdo->prepare('UPDATE ['.$this->schemaTable.'] SET [version]=?');
$rq->execute(array($version));
}
/**
* Run EXPLAIN command
*
* @param string $sql
* @param array $values
* @return array
*/
public function explain($sql, array $values)
{
$this->getConnection()->exec('SET SHOWPLAN_ALL ON');
return $this->getConnection()->query($this->getSqlFromPreparedStatement($sql, $values))->fetchAll(PDO::FETCH_ASSOC);
}
/**
* Get database version
*
* @access public
* @return array
*/
public function getDatabaseVersion()
{
return $this->getConnection()->query('SELECT @@VERSION;')->fetchColumn();
}
}
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