Proyectos de Subversion Moodle

<?php

/**

 * ADOdb Data Dictionary base class.

 *

 * 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();

/**

 * Test script for parser

 */

function lens_ParseTest()

{

$str = "`zcol ACOL` NUMBER(32,2) DEFAULT 'The \"cow\" (and Jim''s dog) jumps over the moon' PRIMARY, INTI INT AUTO DEFAULT 0, zcol2\"afs ds";

print "<p>$str</p>";

$a= lens_ParseArgs($str);

print "<pre>";

print_r($a);

print "</pre>";

}

if (!function_exists('ctype_alnum')) {

	function ctype_alnum($text) {

		return preg_match('/^[a-z0-9]*$/i', $text);

	}

}

//Lens_ParseTest();

/**

	Parse arguments, treat "text" (text) and 'text' as quotation marks.

	To escape, use "" or '' or ))

	Will read in "abc def" sans quotes, as: abc def

	Same with 'abc def'.

	However if `abc def`, then will read in as `abc def`

	@param endstmtchar    Character that indicates end of statement

	@param tokenchars     Include the following characters in tokens apart from A-Z and 0-9

	@returns 2 dimensional array containing parsed tokens.

*/

function lens_ParseArgs($args,$endstmtchar=',',$tokenchars='_.-')

{

	$pos = 0;

	$intoken = false;

	$stmtno = 0;

	$endquote = false;

	$tokens = array();

	$tokens[$stmtno] = array();

	$max = strlen($args);

	$quoted = false;

	$tokarr = array();

	while ($pos < $max) {

		$ch = substr($args,$pos,1);

		switch($ch) {

		case ' ':

		case "\t":

		case "\n":

		case "\r":

			if (!$quoted) {

				if ($intoken) {

					$intoken = false;

					$tokens[$stmtno][] = implode('',$tokarr);

				}

				break;

			}

			$tokarr[] = $ch;

			break;

		case '`':

			if ($intoken) $tokarr[] = $ch;

		case '(':

		case ')':

		case '"':

		case "'":

			if ($intoken) {

				if (empty($endquote)) {

					$tokens[$stmtno][] = implode('',$tokarr);

					if ($ch == '(') $endquote = ')';

					else $endquote = $ch;

					$quoted = true;

					$intoken = true;

					$tokarr = array();

				} else if ($endquote == $ch) {

					$ch2 = substr($args,$pos+1,1);

					if ($ch2 == $endquote) {

						$pos += 1;

						$tokarr[] = $ch2;

					} else {

						$quoted = false;

						$intoken = false;

						$tokens[$stmtno][] = implode('',$tokarr);

						$endquote = '';

					}

				} else

					$tokarr[] = $ch;

			}else {

				if ($ch == '(') $endquote = ')';

				else $endquote = $ch;

				$quoted = true;

				$intoken = true;

				$tokarr = array();

				if ($ch == '`') $tokarr[] = '`';

			}

			break;

		default:

			if (!$intoken) {

				if ($ch == $endstmtchar) {

					$stmtno += 1;

					$tokens[$stmtno] = array();

					break;

				}

				$intoken = true;

				$quoted = false;

				$endquote = false;

				$tokarr = array();

			}

			if ($quoted) $tokarr[] = $ch;

			else if (ctype_alnum($ch) || strpos($tokenchars,$ch) !== false) $tokarr[] = $ch;

			else {

				if ($ch == $endstmtchar) {

					$tokens[$stmtno][] = implode('',$tokarr);

					$stmtno += 1;

					$tokens[$stmtno] = array();

					$intoken = false;

					$tokarr = array();

					break;

				}

				$tokens[$stmtno][] = implode('',$tokarr);

				$tokens[$stmtno][] = $ch;

				$intoken = false;

			}

		}

		$pos += 1;

	}

	if ($intoken) $tokens[$stmtno][] = implode('',$tokarr);

	return $tokens;

}

class ADODB_DataDict {

	/** @var ADOConnection */

	var $connection;

	var $debug = false;

	var $dropTable = 'DROP TABLE %s';

	var $renameTable = 'RENAME TABLE %s TO %s';

	var $dropIndex = 'DROP INDEX %s';

	var $addCol = ' ADD';

	var $alterCol = ' ALTER COLUMN';

	var $dropCol = ' DROP COLUMN';

	var $renameColumn = 'ALTER TABLE %s RENAME COLUMN %s TO %s';	// table, old-column, new-column, column-definitions (not used by default)

	var $nameRegex = '\w';

	var $nameRegexBrackets = 'a-zA-Z0-9_\(\)';

	var $schema = false;

	var $serverInfo = array();

	var $autoIncrement = false;

	var $dataProvider;

	var $invalidResizeTypes4 = array('CLOB','BLOB','TEXT','DATE','TIME'); // for changeTableSQL

	var $blobSize = 100; 	/// any varchar/char field this size or greater is treated as a blob

							/// in other words, we use a text area for editing.

	/** @var string Uppercase driver name */

	var $upperName;

	/*

	* Indicates whether a BLOB/CLOB field will allow a NOT NULL setting

	* The type is whatever is matched to an X or X2 or B type. We must

	* explicitly set the value in the driver to switch the behaviour on

	*/

	public $blobAllowsNotNull;

	/*

	* Indicates whether a BLOB/CLOB field will allow a DEFAULT set

	* The type is whatever is matched to an X or X2 or B type. We must

	* explicitly set the value in the driver to switch the behaviour on

	*/

	public $blobAllowsDefaultValue;

	/**

	 * @var string String to use to quote identifiers and names

	 */

	public $quote;

	function getCommentSQL($table,$col)

	{

		return false;

	}

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

	{

		return false;

	}

	function metaTables()

	{

		if (!$this->connection->isConnected()) return array();

		return $this->connection->metaTables();

	}

	function metaColumns($tab, $upper=true, $schema=false)

	{

		if (!$this->connection->isConnected()) return array();

		return $this->connection->metaColumns($this->tableName($tab), $upper, $schema);

	}

	function metaPrimaryKeys($tab,$owner=false,$intkey=false)

	{

		if (!$this->connection->isConnected()) return array();

		return $this->connection->metaPrimaryKeys($this->tableName($tab), $owner, $intkey);

	}

	function metaIndexes($table, $primary = false, $owner = false)

	{

		if (!$this->connection->isConnected()) return array();

		return $this->connection->metaIndexes($this->tableName($table), $primary, $owner);

	}

	function metaType($t,$len=-1,$fieldobj=false)

	{

		static $typeMap = array(

		'VARCHAR' => 'C',

		'VARCHAR2' => 'C',

		'CHAR' => 'C',

		'C' => 'C',

		'STRING' => 'C',

		'NCHAR' => 'C',

		'NVARCHAR' => 'C',

		'VARYING' => 'C',

		'BPCHAR' => 'C',

		'CHARACTER' => 'C',

		'INTERVAL' => 'C',  # Postgres

		'MACADDR' => 'C', # postgres

		'VAR_STRING' => 'C', # mysql

		##

		'LONGCHAR' => 'X',

		'TEXT' => 'X',

		'NTEXT' => 'X',

		'M' => 'X',

		'X' => 'X',

		'CLOB' => 'X',

		'NCLOB' => 'X',

		'LVARCHAR' => 'X',

		##

		'BLOB' => 'B',

		'IMAGE' => 'B',

		'BINARY' => 'B',

		'VARBINARY' => 'B',

		'LONGBINARY' => 'B',

		'B' => 'B',

		##

		'YEAR' => 'D', // mysql

		'DATE' => 'D',

		'D' => 'D',

		##

		'UNIQUEIDENTIFIER' => 'C', # MS SQL Server

		##

		'TIME' => 'T',

		'TIMESTAMP' => 'T',

		'DATETIME' => 'T',

		'TIMESTAMPTZ' => 'T',

		'SMALLDATETIME' => 'T',

		'T' => 'T',

		'TIMESTAMP WITHOUT TIME ZONE' => 'T', // postgresql

		##

		'BOOL' => 'L',

		'BOOLEAN' => 'L',

		'BIT' => 'L',

		'L' => 'L',

		##

		'COUNTER' => 'R',

		'R' => 'R',

		'SERIAL' => 'R', // ifx

		'INT IDENTITY' => 'R',

		##

		'INT' => 'I',

		'INT2' => 'I',

		'INT4' => 'I',

		'INT8' => 'I',

		'INTEGER' => 'I',

		'INTEGER UNSIGNED' => 'I',

		'SHORT' => 'I',

		'TINYINT' => 'I',

		'SMALLINT' => 'I',

		'I' => 'I',

		##

		'LONG' => 'N', // interbase is numeric, oci8 is blob

		'BIGINT' => 'N', // this is bigger than PHP 32-bit integers

		'DECIMAL' => 'N',

		'DEC' => 'N',

		'REAL' => 'N',

		'DOUBLE' => 'N',

		'DOUBLE PRECISION' => 'N',

		'SMALLFLOAT' => 'N',

		'FLOAT' => 'N',

		'NUMBER' => 'N',

		'NUM' => 'N',

		'NUMERIC' => 'N',

		'MONEY' => 'N',

		## informix 9.2

		'SQLINT' => 'I',

		'SQLSERIAL' => 'I',

		'SQLSMINT' => 'I',

		'SQLSMFLOAT' => 'N',

		'SQLFLOAT' => 'N',

		'SQLMONEY' => 'N',

		'SQLDECIMAL' => 'N',

		'SQLDATE' => 'D',

		'SQLVCHAR' => 'C',

		'SQLCHAR' => 'C',

		'SQLDTIME' => 'T',

		'SQLINTERVAL' => 'N',

		'SQLBYTES' => 'B',

		'SQLTEXT' => 'X',

		 ## informix 10

		"SQLINT8" => 'I8',

		"SQLSERIAL8" => 'I8',

		"SQLNCHAR" => 'C',

		"SQLNVCHAR" => 'C',

		"SQLLVARCHAR" => 'X',

		"SQLBOOL" => 'L'

		);

		if (!$this->connection->isConnected()) {

			$t = strtoupper($t);

			if (isset($typeMap[$t])) return $typeMap[$t];

			return ADODB_DEFAULT_METATYPE;

		}

		return $this->connection->metaType($t,$len,$fieldobj);

	}

	function nameQuote($name = NULL,$allowBrackets=false)

	{

		if (!is_string($name)) {

			return false;

		}

		$name = trim($name);

		if ( !is_object($this->connection) ) {

			return $name;

		}

		$quote = $this->connection->nameQuote;

		// if name is of the form `name`, quote it

		if ( preg_match('/^`(.+)`$/', $name, $matches) ) {

			return $quote . $matches[1] . $quote;

		}

		// if name contains special characters, quote it

		$regex = ($allowBrackets) ? $this->nameRegexBrackets : $this->nameRegex;

		if ( !preg_match('/^[' . $regex . ']+$/', $name) ) {

			return $quote . $name . $quote;

		}

		return $name;

	}

	function tableName($name)

	{

		if ( $this->schema ) {

			return $this->nameQuote($this->schema) .'.'. $this->nameQuote($name);

		}

		return $this->nameQuote($name);

	}

	// Executes the sql array returned by getTableSQL and getIndexSQL

	function executeSQLArray($sql, $continueOnError = true)

	{

		$rez = 2;

		$conn = $this->connection;

		$saved = $conn->debug;

		foreach($sql as $line) {

			if ($this->debug) $conn->debug = true;

			$ok = $conn->execute($line);

			$conn->debug = $saved;

			if (!$ok) {

				if ($this->debug) ADOConnection::outp($conn->errorMsg());

				if (!$continueOnError) return 0;

				$rez = 1;

			}

		}

		return $rez;

	}

	/**

	 	Returns the actual type given a character code.

		C:  varchar

		X:  CLOB (character large object) or largest varchar size if CLOB is not supported

		C2: Multibyte varchar

		X2: Multibyte CLOB

		B:  BLOB (binary large object)

		D:  Date

		T:  Date-time

		L:  Integer field suitable for storing booleans (0 or 1)

		I:  Integer

		F:  Floating point number

		N:  Numeric or decimal number

	*/

	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'];

		return $meta;

	}

	function createDatabase($dbname,$options=false)

	{

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

		$sql = array();

		$s = 'CREATE DATABASE ' . $this->nameQuote($dbname);

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

			$s .= ' '.$options[$this->upperName];

		$sql[] = $s;

		return $sql;

	}

	/*

	 Generates the SQL to create index. Returns an array of sql strings.

	*/

	function createIndexSQL($idxname, $tabname, $flds, $idxoptions = false)

	{

		if (!is_array($flds)) {

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

		}

		foreach($flds as $key => $fld) {

			# some indexes can use partial fields, eg. index first 32 chars of "name" with NAME(32)

			$flds[$key] = $this->nameQuote($fld,$allowBrackets=true);

		}

		return $this->_indexSQL($this->nameQuote($idxname), $this->tableName($tabname), $flds, $this->_options($idxoptions));

	}

	function dropIndexSQL ($idxname, $tabname = NULL)

	{

		return array(sprintf($this->dropIndex, $this->nameQuote($idxname), $this->tableName($tabname)));

	}

	function setSchema($schema)

	{

		$this->schema = $schema;

	}

	function addColumnSQL($tabname, $flds)

	{

		$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->addCol . ' ';

		foreach($lines as $v) {

			$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;

	}

	/**

	 * Change the definition of one column

	 *

	 * As some DBMs can't do that on their own, you need to supply the complete definition of the new table,

	 * to allow recreating the table and copying the content over to the new table

	 * @param string $tabname table-name

	 * @param string $flds column-name and type for the changed column

	 * @param string $tableflds='' complete definition of the new table, eg. for postgres, default ''

	 * @param array|string $tableoptions='' options for the new table see createTableSQL, default ''

	 * @return array with SQL strings

	 */

	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 . ' ';

		foreach($lines as $v) {

			$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;

	}

	/**

	 * Rename one column

	 *

	 * Some DBMs can only do this together with changeing the type of the column (even if that stays the same, eg. mysql)

	 * @param string $tabname table-name

	 * @param string $oldcolumn column-name to be renamed

	 * @param string $newcolumn new column-name

	 * @param string $flds='' complete column-definition-string like for addColumnSQL, only used by mysql atm., default=''

	 * @return array with SQL strings

	 */

	function renameColumnSQL($tabname,$oldcolumn,$newcolumn,$flds='')

	{

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

		if ($flds) {

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

			// genfields can return FALSE at times

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

			$first  = current($lines);

			list(,$column_def) = preg_split("/[\t ]+/",$first,2);

		}

		return array(sprintf($this->renameColumn,$tabname,$this->nameQuote($oldcolumn),$this->nameQuote($newcolumn),$column_def));

	}

	/**

	 * Drop one column

	 *

	 * Some DBM's can't do that on their own, you need to supply the complete definition of the new table,

	 * to allow, recreating the table and copying the content over to the new table

	 * @param string $tabname table-name

	 * @param string $flds column-name and type for the changed column

	 * @param string $tableflds='' complete definition of the new table, eg. for postgres, default ''

	 * @param array|string $tableoptions='' options for the new table see createTableSQL, default ''

	 * @return array with SQL strings

	 */

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

	{

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

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

		$sql = array();

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

		foreach($flds as $v) {

			$sql[] = $alter . $this->nameQuote($v);

		}

		return $sql;

	}

	function dropTableSQL($tabname)

	{

		return array (sprintf($this->dropTable, $this->tableName($tabname)));

	}

	function renameTableSQL($tabname,$newname)

	{

		return array (sprintf($this->renameTable, $this->tableName($tabname),$this->tableName($newname)));

	}

	/**

	 Generate the SQL to create table. Returns an array of sql strings.

	*/

	function createTableSQL($tabname, $flds, $tableoptions=array())

	{

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

		// genfields can return FALSE at times

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

		$taboptions = $this->_options($tableoptions);

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

		$sql = $this->_tableSQL($tabname,$lines,$pkey,$taboptions);

		// ggiunta - 2006/10/12 - KLUDGE:

        // if we are on autoincrement, and table options includes REPLACE, the

        // autoincrement sequence has already been dropped on table creation sql, so

        // we avoid passing REPLACE to trigger creation code. This prevents

        // creating sql that double-drops the sequence

        if ($this->autoIncrement && isset($taboptions['REPLACE']))

        	unset($taboptions['REPLACE']);

		$tsql = $this->_triggers($tabname,$taboptions);

		foreach($tsql as $s) $sql[] = $s;

		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 _genFields($flds,$widespacing=false)

	{

		if (is_string($flds)) {

			$padding = '     ';

			$txt = $flds.$padding;

			$flds = array();

			$flds0 = lens_ParseArgs($txt,',');

			$hasparam = false;

			foreach($flds0 as $f0) {

				$f1 = array();

				foreach($f0 as $token) {

					switch (strtoupper($token)) {

					case 'INDEX':

						$f1['INDEX'] = '';

						// fall through intentionally

					case 'CONSTRAINT':

					case 'DEFAULT':

						$hasparam = $token;

						break;

					default:

						if ($hasparam) $f1[$hasparam] = $token;

						else $f1[] = $token;

						$hasparam = false;

						break;

					}

				}

				// 'index' token without a name means single column index: name it after column

				if (array_key_exists('INDEX', $f1) && $f1['INDEX'] == '') {

					$f1['INDEX'] = isset($f0['NAME']) ? $f0['NAME'] : $f0[0];

					// check if column name used to create an index name was quoted

					if (($f1['INDEX'][0] == '"' || $f1['INDEX'][0] == "'" || $f1['INDEX'][0] == "`") &&

						($f1['INDEX'][0] == substr($f1['INDEX'], -1))) {

						$f1['INDEX'] = $f1['INDEX'][0].'idx_'.substr($f1['INDEX'], 1, -1).$f1['INDEX'][0];

					}

					else

						$f1['INDEX'] = 'idx_'.$f1['INDEX'];

				}

				// reset it, so we don't get next field 1st token as INDEX...

				$hasparam = false;

				$flds[] = $f1;

			}

		}

		$this->autoIncrement = false;

		$lines = array();

		$pkey = array();

		$idxs = array();

		foreach($flds as $fld) {

			if (is_array($fld))

				$fld = array_change_key_case($fld,CASE_UPPER);

			$fname = false;

			$fdefault = false;

			$fautoinc = false;

			$ftype = false;

			$fsize = false;

			$fprec = false;

			$fprimary = false;

			$fnoquote = false;

			$fdefts = false;

			$fdefdate = false;

			$fconstraint = false;

			$fnotnull = false;

			$funsigned = false;

			$findex = '';

			$funiqueindex = false;

			$fOptions	  = array();

			//-----------------

			// Parse attributes

			foreach($fld as $attr => $v) {

				if ($attr == 2 && is_numeric($v))

					$attr = 'SIZE';

				elseif ($attr == 2 && strtoupper($ftype) == 'ENUM')

					$attr = 'ENUM';

				else if (is_numeric($attr) && $attr > 1 && !is_numeric($v))

					$attr = strtoupper($v);

				switch($attr) {

				case '0':

				case 'NAME': 	$fname = $v; break;

				case '1':

				case 'TYPE':

					$ty = $v;

					$ftype = $this->actualType(strtoupper($v));

					break;

				case 'SIZE':

					$dotat = strpos($v,'.');

					if ($dotat === false)

						$dotat = strpos($v,',');

					if ($dotat === false)

						$fsize = $v;

					else {

						$fsize = substr($v,0,$dotat);

						$fprec = substr($v,$dotat+1);

					}

					break;

				case 'UNSIGNED': $funsigned = true; break;

				case 'AUTOINCREMENT':

				case 'AUTO':	$fautoinc = true; $fnotnull = true; break;

				case 'KEY':

                // a primary key col can be non unique in itself (if key spans many cols...)

				case 'PRIMARY':	$fprimary = $v; $fnotnull = true; /*$funiqueindex = true;*/ break;

				case 'DEF':

				case 'DEFAULT': $fdefault = $v; break;

				case 'NOTNULL': $fnotnull = $v; break;

				case 'NOQUOTE': $fnoquote = $v; break;

				case 'DEFDATE': $fdefdate = $v; break;

				case 'DEFTIMESTAMP': $fdefts = $v; break;

				case 'CONSTRAINT': $fconstraint = $v; break;

				// let INDEX keyword create a 'very standard' index on column

				case 'INDEX': $findex = $v; break;

				case 'UNIQUE': $funiqueindex = true; break;

				case 'ENUM':

					$fOptions['ENUM'] = $v; break;

				} //switch

			} // foreach $fld

			//--------------------

			// VALIDATE FIELD INFO

			if (!strlen($fname)) {

				if ($this->debug) ADOConnection::outp("Undefined NAME");

				return false;

			}

			$fid = strtoupper(preg_replace('/^`(.+)`$/', '$1', $fname));

			$fname = $this->nameQuote($fname);

			if (!strlen($ftype)) {

				if ($this->debug) ADOConnection::outp("Undefined TYPE for field '$fname'");

				return false;

			} else {

				$ftype = strtoupper($ftype);

			}

			$ftype = $this->_getSize($ftype, $ty, $fsize, $fprec, $fOptions);

			if (($ty == 'X' || $ty == 'X2' || $ty == 'XL' || $ty == 'B') && !$this->blobAllowsNotNull)

				/*

				* some blob types do not accept nulls, so we override the

				* previously defined value

				*/

				$fnotnull = false;

			if ($fprimary)

				$pkey[] = $fname;

			if (($ty == 'X' || $ty == 'X2' || $ty == 'XL' || $ty == 'B') && !$this->blobAllowsDefaultValue)

				/*

				* some databases do not allow blobs to have defaults, so we

				* override the previously defined value

				*/

				$fdefault = false;

			// build list of indexes

			if ($findex != '') {

				if (array_key_exists($findex, $idxs)) {

					$idxs[$findex]['cols'][] = ($fname);

					if (in_array('UNIQUE', $idxs[$findex]['opts']) != $funiqueindex) {

						if ($this->debug) ADOConnection::outp("Index $findex defined once UNIQUE and once not");

					}

					if ($funiqueindex && !in_array('UNIQUE', $idxs[$findex]['opts']))

						$idxs[$findex]['opts'][] = 'UNIQUE';

				}

				else

				{

					$idxs[$findex] = array();

					$idxs[$findex]['cols'] = array($fname);

					if ($funiqueindex)

						$idxs[$findex]['opts'] = array('UNIQUE');

					else

						$idxs[$findex]['opts'] = array();

				}

			}

			//--------------------

			// CONSTRUCT FIELD SQL

			if ($fdefts) {

				if (substr($this->connection->databaseType,0,5) == 'mysql') {

					$ftype = 'TIMESTAMP';

				} else {

					$fdefault = $this->connection->sysTimeStamp;

				}

			} else if ($fdefdate) {

				if (substr($this->connection->databaseType,0,5) == 'mysql') {

					$ftype = 'TIMESTAMP';

				} else {

					$fdefault = $this->connection->sysDate;

				}

			} else if ($fdefault !== false && !$fnoquote) {

				if ($ty == 'C' or $ty == 'X' or

					( substr($fdefault,0,1) != "'" && !is_numeric($fdefault))) {

					if (($ty == 'D' || $ty == 'T') && strtolower($fdefault) != 'null') {

						// convert default date into database-aware code

						if ($ty == 'T')

						{

							$fdefault = $this->connection->dbTimeStamp($fdefault);

						}

						else

						{

							$fdefault = $this->connection->dbDate($fdefault);

						}

					}

					else

					if (strlen($fdefault) != 1 && substr($fdefault,0,1) == ' ' && substr($fdefault,strlen($fdefault)-1) == ' ')

						$fdefault = trim($fdefault);

					else if (strtolower($fdefault) != 'null')

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

				}

			}

			$suffix = $this->_createSuffix($fname,$ftype,$fnotnull,$fdefault,$fautoinc,$fconstraint,$funsigned);

			// add index creation

			if ($widespacing) $fname = str_pad($fname,24);

			 // check for field names appearing twice

            if (array_key_exists($fid, $lines)) {

            	 ADOConnection::outp("Field '$fname' defined twice");

            }

			$lines[$fid] = $fname.' '.$ftype.$suffix;

			if ($fautoinc) $this->autoIncrement = true;

		} // foreach $flds

		return array($lines,$pkey,$idxs);

	}

	/**

		 GENERATE THE SIZE PART OF THE DATATYPE

			$ftype is the actual type

			$ty is the type defined originally in the DDL

	*/

	function _getSize($ftype, $ty, $fsize, $fprec, $options=false)

	{

		if (strlen($fsize) && $ty != 'X' && $ty != 'B' && strpos($ftype,'(') === false) {

			$ftype .= "(".$fsize;

			if (strlen($fprec)) $ftype .= ",".$fprec;

			$ftype .= ')';

		}

		/*

		* Handle additional options

		*/

		if (is_array($options))

		{

			foreach($options as $type=>$value)

			{

				switch ($type)

				{

					case 'ENUM':

					$ftype .= '(' . $value . ')';

					break;

					default:

				}

			}

		}

		return $ftype;

	}

	// return string must begin with space

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

	{

		$suffix = '';

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

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

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

		return $suffix;

	}

	function _indexSQL($idxname, $tabname, $flds, $idxoptions)

	{

		$sql = array();

		if ( isset($idxoptions['REPLACE']) || isset($idxoptions['DROP']) ) {

			$sql[] = sprintf ($this->dropIndex, $idxname);

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

				return $sql;

		}

		if ( empty ($flds) ) {

			return $sql;

		}

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

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

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

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

		if ( is_array($flds) )

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

		$s .= '(' . $flds . ')';

		$sql[] = $s;

		return $sql;

	}

	function _dropAutoIncrement($tabname)

	{

		return false;

	}

	function _tableSQL($tabname,$lines,$pkey,$tableoptions)

	{

		$sql = array();

		if (isset($tableoptions['REPLACE']) || isset ($tableoptions['DROP'])) {

			$sql[] = sprintf($this->dropTable,$tabname);

			if ($this->autoIncrement) {

				$sInc = $this->_dropAutoIncrement($tabname);

				if ($sInc) $sql[] = $sInc;

			}

			if ( isset ($tableoptions['DROP']) ) {

				return $sql;

			}

		}

		$s = "CREATE TABLE $tabname (\n";

		$s .= implode(",\n", $lines);

		if (sizeof($pkey)>0) {

			$s .= ",\n                 PRIMARY KEY (";

			$s .= implode(", ",$pkey).")";

		}

		if (isset($tableoptions['CONSTRAINTS']))

			$s .= "\n".$tableoptions['CONSTRAINTS'];

		if (isset($tableoptions[$this->upperName.'_CONSTRAINTS']))

			$s .= "\n".$tableoptions[$this->upperName.'_CONSTRAINTS'];

		$s .= "\n)";

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

		$sql[] = $s;

		return $sql;

	}

	/**

		GENERATE TRIGGERS IF NEEDED

		used when table has auto-incrementing field that is emulated using triggers

	*/

	function _triggers($tabname,$taboptions)

	{

		return array();

	}

	/**

		Sanitize options, so that array elements with no keys are promoted to keys

	*/

	function _options($opts)

	{

		if (!is_array($opts)) return array();

		$newopts = array();

		foreach($opts as $k => $v) {

			if (is_numeric($k)) $newopts[strtoupper($v)] = $v;

			else $newopts[strtoupper($k)] = $v;

		}

		return $newopts;

	}

	function _getSizePrec($size)

	{

		$fsize = false;