<?php

/**
  @version   v5.21.0  2021-02-27
  @copyright (c) 2000-2013 John Lim (jlim#natsoft.com). All rights reserved.
  @copyright (c) 2014      Damien Regad, Mark Newnham and the ADOdb community
  Released under both BSD license and Lesser GPL library license.
  Whenever there is any discrepancy between the two licenses,
  the BSD license will take precedence.

  Set tabs to 4 for best viewing.

*/

// 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 = $fieldobj->max_length;
		}
		switch (strtoupper($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($meta)
	{
		switch($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";
	}
}
