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<?php

/**

 * Data Dictionary for DB2.

 *

 * 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

 */

// security - hide paths

if (!defined('ADODB_DIR')) die();

class ADODB2_db2 extends ADODB_DataDict {

	var $databaseType = 'db2';

	var $seqField = false;

	var $dropCol = 'ALTER TABLE %s DROP COLUMN %s';

	public $blobAllowsDefaultValue = true;

	public $blobAllowsNotNull      = true;

 	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($meta) {

		case 'C': return 'VARCHAR';

		case 'XL': return 'CLOB';

		case 'X': return 'VARCHAR(3600)';

		case 'C2': return 'VARCHAR'; // up to 32K

		case 'X2': return 'VARCHAR(3600)'; // up to 32000, but default page size too small

		case 'B': return 'BLOB';

		case 'D': return 'DATE';

		case 'TS':

		case 'T': return 'TIMESTAMP';

		case 'L': return 'SMALLINT';

		case 'I': return 'INTEGER';

		case 'I1': return 'SMALLINT';

		case 'I2': return 'SMALLINT';

		case 'I4': return 'INTEGER';

		case 'I8': return 'BIGINT';

		case 'F': return 'DOUBLE';

		case 'N': return 'DECIMAL';

		default:

			return $meta;

		}

	}

	// return string must begin with space

	function _CreateSuffix($fname,&$ftype,$fnotnull,$fdefault,$fautoinc,$fconstraint,$funsigned)

	{

		$suffix = '';

		if ($fautoinc) return ' GENERATED ALWAYS AS IDENTITY'; # as identity start with

		if (strlen($fdefault)) $suffix .= " DEFAULT $fdefault";

		if ($fnotnull) $suffix .= ' NOT NULL';

		if ($fconstraint) $suffix .= ' '.$fconstraint;

		return $suffix;

	}

	function alterColumnSQL($tabname, $flds, $tableflds='',$tableoptions='')

	{

		$tabname = $this->TableName ($tabname);

		$sql = array();

		list($lines,$pkey,$idxs) = $this->_GenFields($flds);

		// genfields can return FALSE at times

		if ($lines == null) $lines = array();

		$alter = 'ALTER TABLE ' . $tabname . $this->alterCol . ' ';

		$dataTypeWords = array('SET','DATA','TYPE');

		foreach($lines as $v)

		{

			/*

			 * We must now post-process the line to insert the 'SET DATA TYPE'

			 * text into the alter statement

			 */

			$e = explode(' ',$v);

			array_splice($e,1,0,$dataTypeWords);

			$v = implode(' ',$e);

			$sql[] = $alter . $v;

		}

		if (is_array($idxs))

		{

			foreach($idxs as $idx => $idxdef) {

				$sql_idxs = $this->CreateIndexSql($idx, $tabname, $idxdef['cols'], $idxdef['opts']);

				$sql = array_merge($sql, $sql_idxs);

			}

		}

		return $sql;

	}

	function dropColumnSql($tabname, $flds, $tableflds='',$tableoptions='')

	{

		$tabname = $this->connection->getMetaCasedValue($tabname);

		$flds    = $this->connection->getMetaCasedValue($flds);

		if (ADODB_ASSOC_CASE  == ADODB_ASSOC_CASE_NATIVE )

		{

			/*

			 * METACASE_NATIVE

			 */

			$tabname = $this->connection->nameQuote . $tabname . $this->connection->nameQuote;

			$flds    = $this->connection->nameQuote . $flds . $this->connection->nameQuote;

		}

		$sql = sprintf($this->dropCol,$tabname,$flds);

		return (array)$sql;

	}

	function changeTableSQL($tablename, $flds, $tableoptions = false, $dropOldFields=false)

	{

		/**

		  Allow basic table changes to DB2 databases

		  DB2 will fatally reject changes to non character columns

		*/

		$validTypes = array("CHAR","VARC");

		$invalidTypes = array("BIGI","BLOB","CLOB","DATE", "DECI","DOUB", "INTE", "REAL","SMAL", "TIME");

		// check table exists

		$cols = $this->metaColumns($tablename);

		if ( empty($cols)) {

			return $this->createTableSQL($tablename, $flds, $tableoptions);

		}

		// already exists, alter table instead

		list($lines,$pkey) = $this->_GenFields($flds);

		$alter = 'ALTER TABLE ' . $this->tableName($tablename);

		$sql = array();

		foreach ( $lines as $id => $v ) {

			/*

			 * If the metaCasing was NATIVE the col returned with nameQuotes

			 * around the field. We need to remove this for the metaColumn

			 * match

			 */

			$id = str_replace($this->connection->nameQuote,'',$id);

			if ( isset($cols[$id]) && is_object($cols[$id]) ) {

				/**

				  If the first field of $v is the fieldname, and

				  the second is the field type/size, we assume its an

				  attempt to modify the column size, so check that it is allowed

				  $v can have an indeterminate number of blanks between the

				  fields, so account for that too

				 */

				$vargs = explode(' ' , $v);

				// assume that $vargs[0] is the field name.

				$i=0;

				// Find the next non-blank value;

				for ($i=1;$i<sizeof($vargs);$i++)

					if ($vargs[$i] != '')

						break;

				// if $vargs[$i] is one of the following, we are trying to change the

				// size of the field, if not allowed, simply ignore the request.

				if (in_array(substr($vargs[$i],0,4),$invalidTypes))

					continue;

				// insert the appropriate DB2 syntax

				if (in_array(substr($vargs[$i],0,4),$validTypes)) {

					array_splice($vargs,$i,0,array('SET','DATA','TYPE'));

				}

				// Now Look for the NOT NULL statement as this is not allowed in

				// the ALTER table statement. If it is in there, remove it

				if (in_array('NOT',$vargs) && in_array('NULL',$vargs)) {

					for ($i=1;$i<sizeof($vargs);$i++)

					if ($vargs[$i] == 'NOT')

						break;

					array_splice($vargs,$i,2,'');

				}

				$v = implode(' ',$vargs);

				$sql[] = $alter . $this->alterCol . ' ' . $v;

			} else {

				$sql[] = $alter . $this->addCol . ' ' . $v;

			}

		}

		return $sql;

	}

}