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<?php

/**

 * Data Dictionary for Oracle (oci8)

 *

 * 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_oci8 extends ADODB_DataDict {

	var $databaseType = 'oci8';

	var $seqField = false;

	var $seqPrefix = 'SEQ_';

	var $dropTable = "DROP TABLE %s CASCADE CONSTRAINTS";

	var $trigPrefix = 'TRIG_';

	var $alterCol = ' MODIFY ';

	var $typeX = 'VARCHAR(4000)';

	var $typeXL = 'CLOB';

	/**

	 * Legacy compatibility for sequence names for emulated auto-increments.

	 *

	 * If set to true, creates sequences and triggers as TRIG_394545594

	 * instead of TRIG_possibly_too_long_tablename

	 *

	 * @var bool $useCompactAutoIncrements

	 */

	public $useCompactAutoIncrements = false;

	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];

		switch ($t) {

	 	case 'VARCHAR':

	 	case 'VARCHAR2':

		case 'CHAR':

		case 'VARBINARY':

		case 'BINARY':

			if (isset($this) && $len <= $this->blobSize) return 'C';

			return 'X';

		case 'NCHAR':

		case 'NVARCHAR2':

		case 'NVARCHAR':

			if (isset($this) && $len <= $this->blobSize) return 'C2';

			return 'X2';

		case 'NCLOB':

		case 'CLOB':

			return 'XL';

		case 'LONG RAW':

		case 'LONG VARBINARY':

		case 'BLOB':

			return 'B';

		case 'TIMESTAMP':

			return 'TS';

		case 'DATE':

			return 'T';

		case 'INT':

		case 'SMALLINT':

		case 'INTEGER':

			return 'I';

		default:

			return ADODB_DEFAULT_METATYPE;

		}

	}

 	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 'X': return $this->typeX;

		case 'XL': return $this->typeXL;

		case 'C2': return 'NVARCHAR2';

		case 'X2': return 'NVARCHAR2(4000)';

		case 'B': return 'BLOB';

		case 'TS':

				return 'TIMESTAMP';

		case 'D':

		case 'T': return 'DATE';

		case 'L': return 'NUMBER(1)';

		case 'I1': return 'NUMBER(3)';

		case 'I2': return 'NUMBER(5)';

		case 'I':

		case 'I4': return 'NUMBER(10)';

		case 'I8': return 'NUMBER(20)';

		case 'F': return 'NUMBER';

		case 'N': return 'NUMBER';

		case 'R': return 'NUMBER(20)';

		default:

			return $meta;

		}

	}

	function CreateDatabase($dbname, $options=false)

	{

		$options = $this->_Options($options);

		$password = isset($options['PASSWORD']) ? $options['PASSWORD'] : 'tiger';

		$tablespace = isset($options["TABLESPACE"]) ? " DEFAULT TABLESPACE ".$options["TABLESPACE"] : '';

		$sql[] = "CREATE USER ".$dbname." IDENTIFIED BY ".$password.$tablespace;

		$sql[] = "GRANT CREATE SESSION, CREATE TABLE,UNLIMITED TABLESPACE,CREATE SEQUENCE TO $dbname";

		return $sql;

	}

	function AddColumnSQL($tabname, $flds)

	{

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

		$f = array();

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

		$s = "ALTER TABLE $tabname ADD (";

		foreach($lines as $v) {

			$f[] = "\n $v";

		}

		$s .= implode(', ',$f).')';

		$sql[] = $s;

		return $sql;

	}

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

	{

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

		$f = array();

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

		$s = "ALTER TABLE $tabname MODIFY(";

		foreach($lines as $v) {

			$f[] = "\n $v";

		}

		$s .= implode(', ',$f).')';

		$sql[] = $s;

		return $sql;

	}

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

	{

		if (!is_array($flds)) $flds = explode(',',$flds);

		foreach ($flds as $k => $v) $flds[$k] = $this->NameQuote($v);

		$sql = array();

		$s = "ALTER TABLE $tabname DROP(";

		$s .= implode(', ',$flds).') CASCADE CONSTRAINTS';

		$sql[] = $s;

		return $sql;

	}

	function _DropAutoIncrement($t)

	{

		if (strpos($t,'.') !== false) {

			$tarr = explode('.',$t);

			return "drop sequence ".$tarr[0].".seq_".$tarr[1];

		}

		return "drop sequence seq_".$t;

	}

	// return string must begin with space

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

	{

		$suffix = '';

		if ($fdefault == "''" && $fnotnull) {// this is null in oracle

			$fnotnull = false;

			if ($this->debug) ADOConnection::outp("NOT NULL and DEFAULT='' illegal in Oracle");

		}

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

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

		if ($fautoinc) $this->seqField = $fname;

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

		return $suffix;

	}

	/**

	 * Creates an insert trigger to emulate an auto-increment column

	 * in a table

	 *

	 * @param string   $tabname       The name of the table

	 * @param string[] $tableoptions  Optional configuration items

	 *

	 * @return string[] The SQL statements to create the trigger

	 */

	function _Triggers($tabname,$tableoptions)

	{

		if (!$this->seqField) return array();

		if ($this->schema)

		{

			$t = strpos($tabname,'.');

			if ($t !== false)

				$tab = substr($tabname,$t+1);

			else

				$tab = $tabname;

			if ($this->connection->useCompactAutoIncrements)

				$id = sprintf('%u',crc32(strtolower($tab)));

			else

				$id = $tab;

			$seqname = $this->schema.'.'.$this->seqPrefix.$tab;

			$trigname = $this->schema.'.'.$this->trigPrefix.$this->seqPrefix.$tab;

		}

		else

		{

			if ($this->connection->useCompactAutoIncrements)

				$id = sprintf('%u',crc32(strtolower($tabname)));

			else

				$id = $tabname;

			$seqname = $this->seqPrefix.$id;

			$trigname = $this->trigPrefix.$id;

		}

		if (strlen($seqname) > 30) {

			$seqname = $this->seqPrefix.uniqid('');

		} // end if

		if (strlen($trigname) > 30) {

			$trigname = $this->trigPrefix.uniqid('');

		} // end if

		if (isset($tableoptions['REPLACE'])) $sql[] = "DROP SEQUENCE $seqname";

		$seqCache = '';

		if (isset($tableoptions['SEQUENCE_CACHE'])){$seqCache = $tableoptions['SEQUENCE_CACHE'];}

		$seqIncr = '';

		if (isset($tableoptions['SEQUENCE_INCREMENT'])){$seqIncr = ' INCREMENT BY '.$tableoptions['SEQUENCE_INCREMENT'];}

		$seqStart = '';

		if (isset($tableoptions['SEQUENCE_START'])){$seqStart = ' START WITH '.$tableoptions['SEQUENCE_START'];}

		$sql[] = "CREATE SEQUENCE $seqname MINVALUE 1 $seqStart $seqIncr $seqCache";

		$sql[] = "CREATE OR REPLACE TRIGGER $trigname BEFORE insert ON $tabname FOR EACH ROW WHEN (NEW.$this->seqField IS NULL OR NEW.$this->seqField = 0) BEGIN select $seqname.nextval into :new.$this->seqField from dual; END;";

		$this->seqField = false;

		return $sql;

	}

	/*

	CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name [(create_definition,...)]

		[table_options] [select_statement]

		create_definition:

		col_name type [NOT NULL | NULL] [DEFAULT default_value] [AUTO_INCREMENT]

		[PRIMARY KEY] [reference_definition]

		or PRIMARY KEY (index_col_name,...)

		or KEY [index_name] (index_col_name,...)

		or INDEX [index_name] (index_col_name,...)

		or UNIQUE [INDEX] [index_name] (index_col_name,...)

		or FULLTEXT [INDEX] [index_name] (index_col_name,...)

		or [CONSTRAINT symbol] FOREIGN KEY [index_name] (index_col_name,...)

		[reference_definition]

		or CHECK (expr)

	*/

	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;

		}

		if (isset($idxoptions['BITMAP'])) {

			$unique = ' BITMAP';

		} elseif (isset($idxoptions['UNIQUE'])) {

			$unique = ' UNIQUE';

		} else {

			$unique = '';

		}

		if ( is_array($flds) )

			$flds = implode(', ',$flds);

		$s = 'CREATE' . $unique . ' INDEX ' . $idxname . ' ON ' . $tabname . ' (' . $flds . ')';

		if ( isset($idxoptions[$this->upperName]) )

			$s .= $idxoptions[$this->upperName];

		if (isset($idxoptions['oci8']))

			$s .= $idxoptions['oci8'];

		$sql[] = $s;

		return $sql;

	}

	function GetCommentSQL($table,$col)

	{

		$table = $this->connection->qstr($table);

		$col = $this->connection->qstr($col);

		return "select comments from USER_COL_COMMENTS where TABLE_NAME=$table and COLUMN_NAME=$col";

	}

	function SetCommentSQL($table,$col,$cmt)

	{

		$cmt = $this->connection->qstr($cmt);

		return  "COMMENT ON COLUMN $table.$col IS $cmt";

	}

}