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<?php
/**
* MS SQL Server layer for DBO
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package cake.libs.model.datasources.dbo
* @since CakePHP(tm) v 0.10.5.1790
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

App::uses('DboSource', 'Model/Datasource');

/**
* Dbo driver for SQLServer
*
* A Dbo driver for SQLServer 2008 and higher. Requires the `sqlsrv`
* and `pdo_sqlsrv` extensions to be enabled.
*
* @package cake.libs.model.datasources.dbo
*/
class Sqlserver extends DboSource {

/**
* Driver description
*
* @var string
*/
public $description = "SQL Server DBO Driver";

/**
* Starting quote character for quoted identifiers
*
* @var string
*/
public $startQuote = "[";

/**
* Ending quote character for quoted identifiers
*
* @var string
*/
public $endQuote = "]";

/**
* Creates a map between field aliases and numeric indexes. Workaround for the
* SQL Server driver's 30-character column name limitation.
*
* @var array
*/
protected $_fieldMappings = array();

/**
* Storing the last affected value
*
* @var mixed
*/
protected $_lastAffected = false;

/**
* Base configuration settings for MS SQL driver
*
* @var array
*/
protected $_baseConfig = array(
'persistent' => true,
'host' => 'localhost\SQLEXPRESS',
'login' => '',
'password' => '',
'database' => 'cake'
);

/**
* MS SQL column definition
*
* @var array
*/
public $columns = array(
'primary_key' => array('name' => 'IDENTITY (1, 1) NOT NULL'),
'string' => array('name' => 'nvarchar', 'limit' => '255'),
'text' => array('name' => 'nvarchar', 'limit' => 'MAX'),
'integer' => array('name' => 'int', 'formatter' => 'intval'),
'float' => array('name' => 'numeric', 'formatter' => 'floatval'),
'datetime' => array('name' => 'datetime', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
'time' => array('name' => 'datetime', 'format' => 'H:i:s', 'formatter' => 'date'),
'date' => array('name' => 'datetime', 'format' => 'Y-m-d', 'formatter' => 'date'),
'binary' => array('name' => 'varbinary'),
'boolean' => array('name' => 'bit')
);

/**
* Index of basic SQL commands
*
* @var array
*/
protected $_commands = array(
'begin' => 'BEGIN TRANSACTION',
'commit' => 'COMMIT',
'rollback' => 'ROLLBACK'
);

/**
* Define if the last query had error
*
* @var string
*/
private $__lastQueryHadError = false;

/**
* Magic column name used to provide pagination support for SQLServer 2008
* which lacks proper limit/offset support.
*/
const ROW_COUNTER = '_cake_page_rownum_';

/**
* The version of SQLServer being used. If greater than 11
* Normal limit offset statements will be used
*
* @var string
*/
protected $_version;

/**
* Connects to the database using options in the given configuration array.
*
* @return boolean True if the database could be connected, else false
*/
public function connect() {
$config = $this->config;
$this->connected = false;
try {
$flags = array(PDO::ATTR_PERSISTENT => $config['persistent']);
if (!empty($config['encoding'])) {
$flags[PDO::SQLSRV_ATTR_ENCODING] = $config['encoding'];
}
$this->_connection = new PDO(
"sqlsrv:server={$config['host']};Database={$config['database']}",
$config['login'],
$config['password'],
$flags
);
$this->connected = true;
} catch (PDOException $e) {
throw new MissingConnectionException(array('class' => $e->getMessage()));
}

$this->_version = $this->_connection->getAttribute(PDO::ATTR_SERVER_VERSION);
return $this->connected;
}

/**
* Check that PDO SQL Server is installed/loaded
*
* @return boolean
*/
public function enabled() {
return in_array('sqlsrv', PDO::getAvailableDrivers());
}

/**
* Returns an array of sources (tables) in the database.
*
* @return array Array of tablenames in the database
*/
public function listSources() {
$cache = parent::listSources();
if ($cache !== null) {
return $cache;
}
$result = $this->_execute("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE'");

if (!$result) {
$result->closeCursor();
return array();
} else {
$tables = array();

while ($line = $result->fetch()) {
$tables[] = $line[0];
}

$result->closeCursor();
parent::listSources($tables);
return $tables;
}
}

/**
* Returns an array of the fields in given table name.
*
* @param Model $model Model object to describe
* @return array Fields in table. Keys are name and type
*/
public function describe($model) {
$cache = parent::describe($model);
if ($cache != null) {
return $cache;
}
$fields = array();
$table = $this->fullTableName($model, false);
$cols = $this->_execute(
"SELECT
COLUMN_NAME as Field,
DATA_TYPE as Type,
COL_LENGTH('" . $table . "', COLUMN_NAME) as Length,
IS_NULLABLE As [Null],
COLUMN_DEFAULT as [Default],
COLUMNPROPERTY(OBJECT_ID('" . $table . "'), COLUMN_NAME, 'IsIdentity') as [Key],
NUMERIC_SCALE as Size
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = '" . $table . "'"
);
if (!$cols) {
throw new CakeException(__d('cake_dev', 'Could not describe table for %s', $model->name));
}

foreach ($cols as $column) {
$field = $column->Field;
$fields[$field] = array(
'type' => $this->column($column),
'null' => ($column->Null === 'YES' ? true : false),
'default' => preg_replace("/^[(]{1,2}'?([^')]*)?'?[)]{1,2}$/", "$1", $column->Default),
'length' => $this->length($column),
'key' => ($column->Key == '1') ? 'primary' : false
);

if ($fields[$field]['default'] === 'null') {
$fields[$field]['default'] = null;
} else {
$this->value($fields[$field]['default'], $fields[$field]['type']);
}

if ($fields[$field]['key'] !== false && $fields[$field]['type'] == 'integer') {
$fields[$field]['length'] = 11;
} elseif ($fields[$field]['key'] === false) {
unset($fields[$field]['key']);
}
if (in_array($fields[$field]['type'], array('date', 'time', 'datetime', 'timestamp'))) {
$fields[$field]['length'] = null;
}
if ($fields[$field]['type'] == 'float' && !empty($column->Size)) {
$fields[$field]['length'] = $fields[$field]['length'] . ',' . $column->Size;
}
}
$this->__cacheDescription($table, $fields);
$cols->closeCursor();
return $fields;
}


/**
* Generates the fields list of an SQL query.
*
* @param Model $model
* @param string $alias Alias tablename
* @param mixed $fields
* @return array
*/
public function fields($model, $alias = null, $fields = array(), $quote = true) {
if (empty($alias)) {
$alias = $model->alias;
}
$fields = parent::fields($model, $alias, $fields, false);
$count = count($fields);

if ($count >= 1 && strpos($fields[0], 'COUNT(*)') === false) {
$result = array();
for ($i = 0; $i < $count; $i++) {
$prepend = '';

if (strpos($fields[$i], 'DISTINCT') !== false) {
$prepend = 'DISTINCT ';
$fields[$i] = trim(str_replace('DISTINCT', '', $fields[$i]));
}

if (!preg_match('/\s+AS\s+/i', $fields[$i])) {
if (substr($fields[$i], -1) == '*') {
if (strpos($fields[$i], '.') !== false && $fields[$i] != $alias . '.*') {
$build = explode('.', $fields[$i]);
$AssociatedModel = $model->{$build[0]};
} else {
$AssociatedModel = $model;
}

$_fields = $this->fields($AssociatedModel, $AssociatedModel->alias, array_keys($AssociatedModel->schema()));
$result = array_merge($result, $_fields);
continue;
}

if (strpos($fields[$i], '.') === false) {
$this->_fieldMappings[$alias . '__' . $fields[$i]] = $alias . '.' . $fields[$i];
$fieldName = $this->name($alias . '.' . $fields[$i]);
$fieldAlias = $this->name($alias . '__' . $fields[$i]);
} else {
$build = explode('.', $fields[$i]);
$this->_fieldMappings[$build[0] . '__' .$build[1]] = $fields[$i];
$fieldName = $this->name($build[0] . '.' . $build[1]);
$fieldAlias = $this->name(preg_replace("/^\[(.+)\]$/", "$1", $build[0]) . '__' . $build[1]);
}
if ($model->getColumnType($fields[$i]) == 'datetime') {
$fieldName = "CONVERT(VARCHAR(20), {$fieldName}, 20)";
}
$fields[$i] = "{$fieldName} AS {$fieldAlias}";
}
$result[] = $prepend . $fields[$i];
}
return $result;
} else {
return $fields;
}
}

/**
* Generates and executes an SQL INSERT statement for given model, fields, and values.
* Removes Identity (primary key) column from update data before returning to parent, if
* value is empty.
*
* @param Model $model
* @param array $fields
* @param array $values
* @param mixed $conditions
* @return array
*/
public function create($model, $fields = null, $values = null) {
if (!empty($values)) {
$fields = array_combine($fields, $values);
}
$primaryKey = $this->_getPrimaryKey($model);

if (array_key_exists($primaryKey, $fields)) {
if (empty($fields[$primaryKey])) {
unset($fields[$primaryKey]);
} else {
$this->_execute('SET IDENTITY_INSERT ' . $this->fullTableName($model) . ' ON');
}
}
$result = parent::create($model, array_keys($fields), array_values($fields));
if (array_key_exists($primaryKey, $fields) && !empty($fields[$primaryKey])) {
$this->_execute('SET IDENTITY_INSERT ' . $this->fullTableName($model) . ' OFF');
}
return $result;
}

/**
* Generates and executes an SQL UPDATE statement for given model, fields, and values.
* Removes Identity (primary key) column from update data before returning to parent.
*
* @param Model $model
* @param array $fields
* @param array $values
* @param mixed $conditions
* @return array
*/
public function update($model, $fields = array(), $values = null, $conditions = null) {
if (!empty($values)) {
$fields = array_combine($fields, $values);
}
if (isset($fields[$model->primaryKey])) {
unset($fields[$model->primaryKey]);
}
if (empty($fields)) {
return true;
}
return parent::update($model, array_keys($fields), array_values($fields), $conditions);
}

/**
* Returns a limit statement in the correct format for the particular database.
*
* @param integer $limit Limit of results returned
* @param integer $offset Offset from which to start results
* @return string SQL limit/offset statement
*/
public function limit($limit, $offset = null) {
if ($limit) {
$rt = '';
if (!strpos(strtolower($limit), 'top') || strpos(strtolower($limit), 'top') === 0) {
$rt = ' TOP';
}
$rt .= ' ' . $limit;
if (is_int($offset) && $offset > 0) {
$rt = ' OFFSET ' . intval($offset) . ' ROWS FETCH FIRST ' . intval($limit) . ' ROWS ONLY';
}
return $rt;
}
return null;
}

/**
* Converts database-layer column types to basic types
*
* @param mixed $real Either the string value of the fields type.
* or the Result object from Sqlserver::describe()
* @return string Abstract column type (i.e. "string")
*/
public function column($real) {
$limit = null;
$col = $real;
if (is_object($real) && isset($real->Field)) {
$limit = $real->Length;
$col = $real->Type;
}

if ($col == 'datetime2') {
return 'datetime';
}
if (in_array($col, array('date', 'time', 'datetime', 'timestamp'))) {
return $col;
}
if ($col == 'bit') {
return 'boolean';
}
if (strpos($col, 'int') !== false) {
return 'integer';
}
if (strpos($col, 'char') !== false && $limit == -1) {
return 'text';
}
if (strpos($col, 'char') !== false) {
return 'string';
}
if (strpos($col, 'text') !== false) {
return 'text';
}
if (strpos($col, 'binary') !== false || $col == 'image') {
return 'binary';
}
if (in_array($col, array('float', 'real', 'decimal', 'numeric'))) {
return 'float';
}
return 'text';
}

/**
* Handle SQLServer specific length properties.
* SQLServer handles text types as nvarchar/varchar with a length of -1.
*
* @param mixed $length Either the length as a string, or a Column descriptor object.
* @return mixed null|integer with length of column.
*/
public function length($length) {
if (is_object($length) && isset($length->Length)) {
if ($length->Length == -1 && strpos($length->Type, 'char') !== false) {
return null;
}
if (in_array($length->Type, array('nchar', 'nvarchar'))) {
return floor($length->Length / 2);
}
return $length->Length;
}
return parent::length($length);
}

/**
* Builds a map of the columns contained in a result
*
* @param PDOStatement $results
*/
public function resultSet($results) {
$this->map = array();
$numFields = $results->columnCount();
$index = 0;

while ($numFields-- > 0) {
$column = $results->getColumnMeta($index);
$name = $column['name'];

if (strpos($name, '__')) {
if (isset($this->_fieldMappings[$name]) && strpos($this->_fieldMappings[$name], '.')) {
$map = explode('.', $this->_fieldMappings[$name]);
} elseif (isset($this->_fieldMappings[$name])) {
$map = array(0, $this->_fieldMappings[$name]);
} else {
$map = array(0, $name);
}
} else {
$map = array(0, $name);
}
$map[] = ($column['sqlsrv:decl_type'] == 'bit') ? 'boolean' : $column['native_type'];
$this->map[$index++] = $map;
}
}

/**
* Builds final SQL statement
*
* @param string $type Query type
* @param array $data Query data
* @return string
*/
public function renderStatement($type, $data) {
switch (strtolower($type)) {
case 'select':
extract($data);
$fields = trim($fields);

if (strpos($limit, 'TOP') !== false && strpos($fields, 'DISTINCT ') === 0) {
$limit = 'DISTINCT ' . trim($limit);
$fields = substr($fields, 9);
}

// hack order as SQLServer requires an order if there is a limit.
if ($limit && !$order) {
$order = 'ORDER BY (SELECT NULL)';
}

// For older versions use the subquery version of pagination.
if (version_compare($this->_version, '11', '<') && preg_match('/FETCH\sFIRST\s+([0-9]+)/i', $limit, $offset)) {
preg_match('/OFFSET\s*(\d+)\s*.*?(\d+)\s*ROWS/', $limit, $limitOffset);

$limit = 'TOP ' . intval($limitOffset[2]);
$page = intval($limitOffset[1] / $limitOffset[2]);
$offset = intval($limitOffset[2] * $page);

$rowCounter = self::ROW_COUNTER;
return "
SELECT {$limit} * FROM (
SELECT {$fields}, ROW_NUMBER() OVER ({$order}) AS {$rowCounter}
FROM {$table} {$alias} {$joins} {$conditions} {$group}
) AS _cake_paging_
WHERE _cake_paging_.{$rowCounter} > {$offset}
ORDER BY _cake_paging_.{$rowCounter}
";
} elseif (strpos($limit, 'FETCH') !== false) {
return "SELECT {$fields} FROM {$table} {$alias} {$joins} {$conditions} {$group} {$order} {$limit}";
} else {
return "SELECT {$limit} {$fields} FROM {$table} {$alias} {$joins} {$conditions} {$group} {$order}";
}
break;
case "schema":
extract($data);

foreach ($indexes as $i => $index) {
if (preg_match('/PRIMARY KEY/', $index)) {
unset($indexes[$i]);
break;
}
}

foreach (array('columns', 'indexes') as $var) {
if (is_array(${$var})) {
${$var} = "\t" . implode(",\n\t", array_filter(${$var}));
}
}
return "CREATE TABLE {$table} (\n{$columns});\n{$indexes}";
break;
default:
return parent::renderStatement($type, $data);
break;
}
}

/**
* Returns a quoted and escaped string of $data for use in an SQL statement.
*
* @param string $data String to be prepared for use in an SQL statement
* @param string $column The column into which this data will be inserted
* @return string Quoted and escaped data
*/
public function value($data, $column = null) {
if (is_array($data) || is_object($data)) {
return parent::value($data, $column);
} elseif (in_array($data, array('{$__cakeID__$}', '{$__cakeForeignKey__$}'), true)) {
return $data;
}

if (empty($column)) {
$column = $this->introspectType($data);
}

switch ($column) {
case 'string':
case 'text':
return 'N' . $this->_connection->quote($data, PDO::PARAM_STR);
default:
return parent::value($data, $column);
}
}
/**
* Returns an array of all result rows for a given SQL query.
* Returns false if no rows matched.
*
* @param string $sql SQL statement
* @param boolean $cache Enables returning/storing cached query results
* @return array Array of resultset rows, or false if no rows matched
*/
public function read($model, $queryData = array(), $recursive = null) {
$results = parent::read($model, $queryData, $recursive);
$this->_fieldMappings = array();
return $results;
}

/**
* Fetches the next row from the current result set.
* Eats the magic ROW_COUNTER variable.
*
* @return mixed
*/
public function fetchResult() {
if ($row = $this->_result->fetch()) {
$resultRow = array();
foreach ($this->map as $col => $meta) {
list($table, $column, $type) = $meta;
if ($table === 0 && $column === self::ROW_COUNTER) {
continue;
}
$resultRow[$table][$column] = $row[$col];
if ($type === 'boolean' && !is_null($row[$col])) {
$resultRow[$table][$column] = $this->boolean($resultRow[$table][$column]);
}
}
return $resultRow;
}
$this->_result->closeCursor();
return false;
}

/**
* Inserts multiple values into a table
*
* @param string $table
* @param string $fields
* @param array $values
*/
public function insertMulti($table, $fields, $values) {
$primaryKey = $this->_getPrimaryKey($table);
$hasPrimaryKey = $primaryKey != null && (
(is_array($fields) && in_array($primaryKey, $fields)
|| (is_string($fields) && strpos($fields, $this->startQuote . $primaryKey . $this->endQuote) !== false))
);

if ($hasPrimaryKey) {
$this->_execute('SET IDENTITY_INSERT ' . $this->fullTableName($table) . ' ON');
}

$table = $this->fullTableName($table);
$fields = implode(', ', array_map(array(&$this, 'name'), $fields));
$this->begin();
foreach ($values as $value) {
$holder = implode(', ', array_map(array(&$this, 'value'), $value));
$this->_execute("INSERT INTO {$table} ({$fields}) VALUES ({$holder})");
}
$this->commit();

if ($hasPrimaryKey) {
$this->_execute('SET IDENTITY_INSERT ' . $this->fullTableName($table) . ' OFF');
}
}

/**
* Generate a database-native column schema string
*
* @param array $column An array structured like the following: array('name'=>'value', 'type'=>'value'[, options]),
* where options can be 'default', 'length', or 'key'.
* @return string
*/
public function buildColumn($column) {
$result = preg_replace('/(int|integer)\([0-9]+\)/i', '$1', parent::buildColumn($column));
if (strpos($result, 'DEFAULT NULL') !== false) {
if (isset($column['default']) && $column['default'] === '') {
$result = str_replace('DEFAULT NULL', "DEFAULT ''", $result);
} else {
$result = str_replace('DEFAULT NULL', 'NULL', $result);
}
} elseif (array_keys($column) == array('type', 'name')) {
$result .= ' NULL';
} elseif (strpos($result, "DEFAULT N'")) {
$result = str_replace("DEFAULT N'", "DEFAULT '", $result);
}
return $result;
}

/**
* Format indexes for create table
*
* @param array $indexes
* @param string $table
* @return string
*/
public function buildIndex($indexes, $table = null) {
$join = array();

foreach ($indexes as $name => $value) {
if ($name == 'PRIMARY') {
$join[] = 'PRIMARY KEY (' . $this->name($value['column']) . ')';
} else if (isset($value['unique']) && $value['unique']) {
$out = "ALTER TABLE {$table} ADD CONSTRAINT {$name} UNIQUE";

if (is_array($value['column'])) {
$value['column'] = implode(', ', array_map(array(&$this, 'name'), $value['column']));
} else {
$value['column'] = $this->name($value['column']);
}
$out .= "({$value['column']});";
$join[] = $out;
}
}
return $join;
}

/**
* Makes sure it will return the primary key
*
* @param mixed $model Model instance of table name
* @return string
*/
protected function _getPrimaryKey($model) {
if (!is_object($model)) {
$model = new Model(false, $model);
}
$schema = $this->describe($model);
foreach ($schema as $field => $props) {
if (isset($props['key']) && $props['key'] == 'primary') {
return $field;
}
}
return null;
}

/**
* Returns number of affected rows in previous database operation. If no previous operation exists,
* this returns false.
*
* @return integer Number of affected rows
*/
public function lastAffected() {
$affected = parent::lastAffected();
if ($affected === null && $this->_lastAffected !== false) {
return $this->_lastAffected;
}
return $affected;
}
/**
* Executes given SQL statement.
*
* @param string $sql SQL statement
* @param array $params list of params to be bound to query (supported only in select)
* @param array $prepareOptions Options to be used in the prepare statement
* @return mixed PDOStatement if query executes with no problem, true as the result of a succesfull, false on error
* query returning no rows, suchs as a CREATE statement, false otherwise
*/
protected function _execute($sql, $params = array(), $prepareOptions = array()) {
$this->_lastAffected = false;
if (strncasecmp($sql, 'SELECT', 6) == 0) {
$prepareOptions += array(PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL);
return parent::_execute($sql, $params, $prepareOptions);
}
try {
$this->_lastAffected = $this->_connection->exec($sql);
if ($this->_lastAffected === false) {
$this->_results = null;
$error = $this->_connection->errorInfo();
$this->error = $error[2];
return false;
}
return true;
} catch (PDOException $e) {
$this->_results = null;
$this->error = $e->getMessage();
return false;
}
}

/**
* Generate a "drop table" statement for the given Schema object
*
* @param CakeSchema $schema An instance of a subclass of CakeSchema
* @param string $table Optional. If specified only the table name given will be generated.
* Otherwise, all tables defined in the schema are generated.
* @return string
*/
public function dropSchema(CakeSchema $schema, $table = null) {
$out = '';
foreach ($schema->tables as $curTable => $columns) {
if (!$table || $table == $curTable) {
$t = $this->fullTableName($curTable);
$out .= "IF OBJECT_ID('" . $this->fullTableName($curTable, false). "', 'U') IS NOT NULL DROP TABLE " . $this->fullTableName($curTable) . ";\n";
}
}
return $out;
}

}
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