284 lines
9.2 KiB
PHP
284 lines
9.2 KiB
PHP
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<?php
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class Doctrine_DatabasePlatform_MsSqlPlatform extends Doctrine_DatabasePlatform
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{
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/**
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* the constructor
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*/
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public function __construct()
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{
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parent::__construct();
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}
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/**
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* Adds an adapter-specific LIMIT clause to the SELECT statement.
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* [ borrowed from Zend Framework ]
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*
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* @param string $query
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* @param mixed $limit
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* @param mixed $offset
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* @link http://lists.bestpractical.com/pipermail/rt-devel/2005-June/007339.html
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* @return string
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* @override
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*/
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public function writeLimitClause($query, $limit, $offset)
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{
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if ($limit > 0) {
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$count = intval($limit);
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$offset = intval($offset);
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if ($offset < 0) {
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throw new Doctrine_Connection_Exception("LIMIT argument offset=$offset is not valid");
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}
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$orderby = stristr($query, 'ORDER BY');
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if ($orderby !== false) {
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$sort = (stripos($orderby, 'desc') !== false) ? 'desc' : 'asc';
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$order = str_ireplace('ORDER BY', '', $orderby);
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$order = trim(preg_replace('/ASC|DESC/i', '', $order));
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}
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$query = preg_replace('/^SELECT\s/i', 'SELECT TOP ' . ($count+$offset) . ' ', $query);
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$query = 'SELECT * FROM (SELECT TOP ' . $count . ' * FROM (' . $query . ') AS inner_tbl';
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if ($orderby !== false) {
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$query .= ' ORDER BY ' . $order . ' ';
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$query .= (stripos($sort, 'asc') !== false) ? 'DESC' : 'ASC';
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}
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$query .= ') AS outer_tbl';
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if ($orderby !== false) {
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$query .= ' ORDER BY ' . $order . ' ' . $sort;
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}
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return $query;
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}
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return $query;
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}
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/**
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* Return string to call a variable with the current timestamp inside an SQL statement
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* There are three special variables for current date and time:
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* - CURRENT_TIMESTAMP (date and time, TIMESTAMP type)
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* - CURRENT_DATE (date, DATE type)
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* - CURRENT_TIME (time, TIME type)
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*
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* @return string to call a variable with the current timestamp
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* @override
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*/
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public function getNowExpression($type = 'timestamp')
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{
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switch ($type) {
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case 'time':
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case 'date':
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case 'timestamp':
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default:
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return 'GETDATE()';
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}
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}
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/**
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* return string to call a function to get a substring inside an SQL statement
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*
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* @return string to call a function to get a substring
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* @override
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*/
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public function getSubstringExpression($value, $position, $length = null)
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{
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if ( ! is_null($length)) {
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return 'SUBSTRING(' . $value . ', ' . $position . ', ' . $length . ')';
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}
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return 'SUBSTRING(' . $value . ', ' . $position . ', LEN(' . $value . ') - ' . $position . ' + 1)';
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}
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/**
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* Returns string to concatenate two or more string parameters
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*
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* @param string $arg1
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* @param string $arg2
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* @param string $values...
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* @return string to concatenate two strings
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* @override
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*/
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public function getConcatExpression()
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{
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$args = func_get_args();
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return '(' . implode(' + ', $args) . ')';
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}
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/**
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* Returns global unique identifier
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*
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* @return string to get global unique identifier
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* @override
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*/
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public function getGuidExpression()
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{
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return 'NEWID()';
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}
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/**
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* Obtain DBMS specific SQL code portion needed to declare an text type
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* field to be used in statements like CREATE TABLE.
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*
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* @param array $field associative array with the name of the properties
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* of the field being declared as array indexes. Currently, the types
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* of supported field properties are as follows:
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*
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* length
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* Integer value that determines the maximum length of the text
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* field. If this argument is missing the field should be
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* declared to have the longest length allowed by the DBMS.
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*
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* default
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* Text value to be used as default for this field.
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*
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* notnull
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* Boolean flag that indicates whether this field is constrained
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* to not be set to null.
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*
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* @return string DBMS specific SQL code portion that should be used to
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* declare the specified field.
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* @override
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*/
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public function getNativeDeclaration($field)
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{
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if ( ! isset($field['type'])) {
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throw new Doctrine_DataDict_Exception('Missing column type.');
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}
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switch ($field['type']) {
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case 'array':
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case 'object':
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case 'text':
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case 'char':
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case 'varchar':
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case 'string':
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case 'gzip':
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$length = !empty($field['length'])
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? $field['length'] : false;
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$fixed = ((isset($field['fixed']) && $field['fixed']) || $field['type'] == 'char') ? true : false;
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return $fixed ? ($length ? 'CHAR('.$length.')' : 'CHAR('.$this->conn->options['default_text_field_length'].')')
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: ($length ? 'VARCHAR('.$length.')' : 'TEXT');
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case 'clob':
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if ( ! empty($field['length'])) {
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$length = $field['length'];
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if ($length <= 8000) {
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return 'VARCHAR('.$length.')';
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}
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}
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return 'TEXT';
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case 'blob':
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if ( ! empty($field['length'])) {
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$length = $field['length'];
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if ($length <= 8000) {
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return "VARBINARY($length)";
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}
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}
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return 'IMAGE';
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case 'integer':
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case 'enum':
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case 'int':
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return 'INT';
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case 'boolean':
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return 'BIT';
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case 'date':
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return 'CHAR(' . strlen('YYYY-MM-DD') . ')';
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case 'time':
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return 'CHAR(' . strlen('HH:MM:SS') . ')';
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case 'timestamp':
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return 'CHAR(' . strlen('YYYY-MM-DD HH:MM:SS') . ')';
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case 'float':
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return 'FLOAT';
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case 'decimal':
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$length = !empty($field['length']) ? $field['length'] : 18;
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$scale = !empty($field['scale']) ? $field['scale'] : $this->conn->getAttribute(Doctrine::ATTR_DECIMAL_PLACES);
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return 'DECIMAL('.$length.','.$scale.')';
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}
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throw new Doctrine_DataDict_Exception('Unknown field type \'' . $field['type'] . '\'.');
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}
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/**
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* Maps a native array description of a field to a MDB2 datatype and length
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*
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* @param array $field native field description
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* @return array containing the various possible types, length, sign, fixed
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* @override
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*/
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public function getPortableDeclaration($field)
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{
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$db_type = preg_replace('/[\d\(\)]/','', strtolower($field['type']) );
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$length = (isset($field['length']) && $field['length'] > 0) ? $field['length'] : null;
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$type = array();
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// todo: unsigned handling seems to be missing
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$unsigned = $fixed = null;
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if ( ! isset($field['name']))
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$field['name'] = '';
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switch ($db_type) {
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case 'bit':
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$type[0] = 'boolean';
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break;
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case 'tinyint':
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case 'smallint':
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case 'int':
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$type[0] = 'integer';
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if ($length == 1) {
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$type[] = 'boolean';
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}
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break;
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case 'datetime':
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$type[0] = 'timestamp';
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break;
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case 'float':
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case 'real':
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case 'numeric':
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$type[0] = 'float';
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break;
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case 'decimal':
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case 'money':
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$type[0] = 'decimal';
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break;
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case 'text':
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case 'varchar':
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case 'ntext':
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case 'nvarchar':
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$fixed = false;
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case 'char':
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case 'nchar':
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$type[0] = 'string';
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if ($length == '1') {
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$type[] = 'boolean';
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if (preg_match('/^[is|has]/', $field['name'])) {
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$type = array_reverse($type);
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}
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} elseif (strstr($db_type, 'text')) {
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$type[] = 'clob';
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}
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if ($fixed !== false) {
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$fixed = true;
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}
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break;
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case 'image':
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case 'varbinary':
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$type[] = 'blob';
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$length = null;
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break;
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default:
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throw new Doctrine_DataDict_Exception('unknown database attribute type: '.$db_type);
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}
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return array('type' => $type,
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'length' => $length,
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'unsigned' => $unsigned,
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'fixed' => $fixed);
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}
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}
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?>
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