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<?php
/**
 * Data Dictionary for Microsoft SQL Server (mssql)
 *
 * 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 2014 Damien Regad, Mark Newnham and the ADOdb community
 */

/*
In ADOdb, named quotes for MS SQL Server use ". From the MSSQL Docs:

Note Delimiters are for identifiers only. Delimiters cannot be used for keywords,
	whether or not they are marked as reserved in SQL Server.

Quoted identifiers are delimited by double quotation marks ("):
	SELECT * FROM "Blanks in Table Name"

Bracketed identifiers are delimited by brackets ([ ]):
	SELECT * FROM [Blanks In Table Name]

Quoted identifiers are valid only when the QUOTED_IDENTIFIER option is set to ON. By default,
	the Microsoft OLE DB Provider for SQL Server and SQL Server ODBC driver set QUOTED_IDENTIFIER ON
	when they connect.

In Transact-SQL, the option can be set at various levels using SET QUOTED_IDENTIFIER,
	the quoted identifier option of sp_dboption, or the user options option of sp_configure.

When SET ANSI_DEFAULTS is ON, SET QUOTED_IDENTIFIER is enabled.

Syntax

SET QUOTED_IDENTIFIER { ON | OFF }

// security - hide paths
if (!defined('ADODB_DIR')) die();

class ADODB2_mssql extends ADODB_DataDict {
	var $databaseType = 'mssql';
	var $dropIndex = 'DROP INDEX %2$s.%1$s';
	var $renameTable = "EXEC sp_rename '%s','%s'";
	var $renameColumn = "EXEC sp_rename '%s.%s','%s'";

var $typeX = 'TEXT';  ## Alternatively, set it to VARCHAR(4000)
	var $typeXL = 'TEXT';

//var $alterCol = ' ALTER COLUMN ';

function MetaType($t,$len=-1,$fieldobj=false)
	{
		if (is_object($t)) {
			$fieldobj = $t;
			$t = $fieldobj->type;
			$len = $fieldobj->max_length;
		}
		
		$t = strtoupper($t);
		
		if (array_key_exists($t,$this->connection->customActualTypes))
			return  $this->connection->customActualTypes[$t];

$len = -1; // mysql max_length is not accurate
		switch ($t) {
		case 'R':
		case 'INT':
		case 'INTEGER': return  'I';
		case 'BIT':
		case 'TINYINT': return  'I1';
		case 'SMALLINT': return 'I2';
		case 'BIGINT':  return  'I8';
		case 'SMALLDATETIME': return 'T';
		case 'REAL':
		case 'FLOAT': return 'F';
		default: return parent::MetaType($t,$len,$fieldobj);
		}
	}

function ActualType($meta)
	{
		
		$meta = strtoupper($meta);
		
		/*
		* Add support for custom meta types. We do this
		* first, that allows us to override existing types
		*/
		if (isset($this->connection->customMetaTypes[$meta]))
			return $this->connection->customMetaTypes[$meta]['actual'];
		
		switch(strtoupper($meta)) {

case 'C': return 'VARCHAR';
		case 'XL': return (isset($this)) ? $this->typeXL : 'TEXT';
		case 'X': return (isset($this)) ? $this->typeX : 'TEXT'; ## could be varchar(8000), but we want compat with oracle
		case 'C2': return 'NVARCHAR';
		case 'X2': return 'NTEXT';

case 'B': return 'IMAGE';

case 'D': return 'DATETIME';

case 'TS':
		case 'T': return 'DATETIME';
		case 'L': return 'BIT';

case 'R':
		case 'I': return 'INT';
		case 'I1': return 'TINYINT';
		case 'I2': return 'SMALLINT';
		case 'I4': return 'INT';
		case 'I8': return 'BIGINT';

case 'F': return 'REAL';
		case 'N': return 'NUMERIC';
		default:
			return $meta;
		}
	}

function AddColumnSQL($tabname, $flds)
	{
		$tabname = $this->TableName ($tabname);
		$f = array();
		list($lines,$pkey) = $this->_GenFields($flds);
		$s = "ALTER TABLE $tabname $this->addCol";
		foreach($lines as $v) {
			$f[] = "\n $v";
		}
		$s .= implode(', ',$f);
		$sql[] = $s;
		return $sql;
	}

/*
	function AlterColumnSQL($tabname, $flds, $tableflds='', $tableoptions='')
	{
		$tabname = $this->TableName ($tabname);
		$sql = array();
		list($lines,$pkey) = $this->_GenFields($flds);
		foreach($lines as $v) {
			$sql[] = "ALTER TABLE $tabname $this->alterCol $v";
		}

return $sql;
	}
	*/

function DropColumnSQL($tabname, $flds, $tableflds='',$tableoptions='')
	{
		$tabname = $this->TableName ($tabname);
		if (!is_array($flds))
			$flds = explode(',',$flds);
		$f = array();
		$s = 'ALTER TABLE ' . $tabname;
		foreach($flds as $v) {
			$f[] = "\n$this->dropCol ".$this->NameQuote($v);
		}
		$s .= implode(', ',$f);
		$sql[] = $s;
		return $sql;
	}

// return string must begin with space
	function _CreateSuffix($fname,&$ftype,$fnotnull,$fdefault,$fautoinc,$fconstraint,$funsigned)
	{
		$suffix = '';
		if (strlen($fdefault)) $suffix .= " DEFAULT $fdefault";
		if ($fautoinc) $suffix .= ' IDENTITY(1,1)';
		if ($fnotnull) $suffix .= ' NOT NULL';
		else if ($suffix == '') $suffix .= ' NULL';
		if ($fconstraint) $suffix .= ' '.$fconstraint;
		return $suffix;
	}

/*
CREATE TABLE
    [ database_name.[ owner ] . | owner. ] table_name
    ( { < column_definition >
        | column_name AS computed_column_expression
        | < table_constraint > ::= [ CONSTRAINT constraint_name ] }

| [ { PRIMARY KEY | UNIQUE } [ ,...n ]
    )

[ ON { filegroup | DEFAULT } ]
[ TEXTIMAGE_ON { filegroup | DEFAULT } ]

< column_definition > ::= { column_name data_type }
    [ COLLATE < collation_name > ]
    [ [ DEFAULT constant_expression ]
        | [ IDENTITY [ ( seed , increment ) [ NOT FOR REPLICATION ] ] ]
    ]
    [ ROWGUIDCOL]
    [ < column_constraint > ] [ ...n ]

< column_constraint > ::= [ CONSTRAINT constraint_name ]
    { [ NULL | NOT NULL ]
        | [ { PRIMARY KEY | UNIQUE }
            [ CLUSTERED | NONCLUSTERED ]
            [ WITH FILLFACTOR = fillfactor ]
            [ON {filegroup | DEFAULT} ] ]
        ]
        | [ [ FOREIGN KEY ]
            REFERENCES ref_table [ ( ref_column ) ]
            [ ON DELETE { CASCADE | NO ACTION } ]
            [ ON UPDATE { CASCADE | NO ACTION } ]
            [ NOT FOR REPLICATION ]
        ]
        | CHECK [ NOT FOR REPLICATION ]
        ( logical_expression )
    }

< table_constraint > ::= [ CONSTRAINT constraint_name ]
    { [ { PRIMARY KEY | UNIQUE }
        [ CLUSTERED | NONCLUSTERED ]
        { ( column [ ASC | DESC ] [ ,...n ] ) }
        [ WITH FILLFACTOR = fillfactor ]
        [ ON { filegroup | DEFAULT } ]
    ]
    | FOREIGN KEY
        [ ( column [ ,...n ] ) ]
        REFERENCES ref_table [ ( ref_column [ ,...n ] ) ]
        [ ON DELETE { CASCADE | NO ACTION } ]
        [ ON UPDATE { CASCADE | NO ACTION } ]
        [ NOT FOR REPLICATION ]
    | CHECK [ NOT FOR REPLICATION ]
        ( search_conditions )
    }

/*
	CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name
    ON { table | view } ( column [ ASC | DESC ] [ ,...n ] )
		[ WITH < index_option > [ ,...n] ]
		[ ON filegroup ]
		< index_option > :: =
		    { PAD_INDEX |
		        FILLFACTOR = fillfactor |
		        IGNORE_DUP_KEY |
		        DROP_EXISTING |
		    STATISTICS_NORECOMPUTE |
		    SORT_IN_TEMPDB
		}
*/
	function _IndexSQL($idxname, $tabname, $flds, $idxoptions)
	{
		$sql = array();

if ( isset($idxoptions['REPLACE']) || isset($idxoptions['DROP']) ) {
			$sql[] = sprintf ($this->dropIndex, $idxname, $tabname);
			if ( isset($idxoptions['DROP']) )
				return $sql;
		}

if ( empty ($flds) ) {
			return $sql;
		}

$unique = isset($idxoptions['UNIQUE']) ? ' UNIQUE' : '';
		$clustered = isset($idxoptions['CLUSTERED']) ? ' CLUSTERED' : '';

if ( is_array($flds) )
			$flds = implode(', ',$flds);
		$s = 'CREATE' . $unique . $clustered . ' INDEX ' . $idxname . ' ON ' . $tabname . ' (' . $flds . ')';

if ( isset($idxoptions[$this->upperName]) )
			$s .= $idxoptions[$this->upperName];

$sql[] = $s;

return $sql;
	}

function _GetSize($ftype, $ty, $fsize, $fprec, $options=false)
	{
		switch ($ftype) {
		case 'INT':
		case 'SMALLINT':
		case 'TINYINT':
		case 'BIGINT':
			return $ftype;
		}
    	if ($ty == 'T') return $ftype;
    	return parent::_GetSize($ftype, $ty, $fsize, $fprec, $options);

}
}

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