<?php
/**
 * ADOdb Lite Meta Module for SQlitepo
 * 
 * Portions of the Meta Coding came from ADOdb
 */

/* 
  (c) 2000-2005 John Lim (jlim@natsoft.com.my). All rights reserved.
  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. See License.txt. 
*/

eval('class sqlitepo_meta_EXTENDER extends '. $last_module . '_ADOConnection { }');

class sqlitepo_meta_ADOConnection extends sqlitepo_meta_EXTENDER
{
	var $metaTablesSQL = "SELECT name FROM sqlite_master WHERE type='table' ORDER BY name";
	var $metaColumnsSQL = "SHOW COLUMNS FROM %s";
//var $fetchMode = false;

	function MetaError($err=false)
	{
		include_once(ADODB_DIR."/adodb-error.inc.php");
		if ($err === false)
			$err = $this->ErrorNo();

		return adodb_error($this->dataProvider,$this->databaseType,$err);
	}

	function MetaErrorMsg($errno)
	{
		include_once(ADODB_DIR."/adodb-error.inc.php");
		return adodb_errormsg($errno);
	}

	/**
	 * @returns an array with the primary key columns in it.
	 */
	function MetaPrimaryKeys($table, $owner=false)
	{
	// owner not used in base class - see oci8
		$p = array();
		$objs =& $this->MetaColumns($table);
		if ($objs) {
			foreach($objs as $v) {
				if (!empty($v->primary_key))
					$p[] = $v->name;
			}
		}
		if (sizeof($p)) return $p;
		if (function_exists('ADODB_VIEW_PRIMARYKEYS'))
			return ADODB_VIEW_PRIMARYKEYS($this->databaseType, $this->database, $table, $owner);
		return false;
	}

	/**
	 * @returns assoc array where keys are tables, and values are foreign keys
	 */
	function MetaForeignKeys($table, $owner=false, $upper=false)
	{
		return false;
	}

	// not the fastest implementation - quick and dirty - jlim
	// for best performance, use the actual $rs->MetaType().
	function MetaType($t,$len=-1,$fieldobj=false)
	{
		if (empty($this->_metars)) {
			$rsclass = $this->last_module_name . "_ResultSet";
			$this->_metars =& new $rsclass(false,$this->fetchMode); 
		}

		return $this->_metars->MetaType($t,$len,$fieldobj);
	}

	/**
	 * return the databases that the driver can connect to. 
	 * Some databases will return an empty array.
	 *
	 * @return an array of database names.
	 */
		function MetaDatabases() 
		{
		global $ADODB_FETCH_MODE;
		
			if ($this->metaDatabasesSQL) {
				$save = $ADODB_FETCH_MODE; 
				$ADODB_FETCH_MODE = ADODB_FETCH_NUM; 
				
				if ($this->fetchMode !== false) $savem = $this->SetFetchMode(false);
				
				$arr = $this->GetCol($this->metaDatabasesSQL);
				if (isset($savem)) $this->SetFetchMode($savem);
				$ADODB_FETCH_MODE = $save; 
			
				return $arr;
			}
			
			return false;
		}

	/**
	 * @param ttype can either be 'VIEW' or 'TABLE' or false. 
	 * 		If false, both views and tables are returned.
	 *		"VIEW" returns only views
	 *		"TABLE" returns only tables
	 * @param showSchema returns the schema/user with the table name, eg. USER.TABLE
	 * @param mask  is the input mask - only supported by oci8 and postgresql
	 *
	 * @return  array of tables for current database.
	 */ 

	function &MetaTables($ttype=false,$showSchema=false,$mask=false) 
	{
		global $ADODB_FETCH_MODE;

		$false = false;
		if ($mask) {
			return $false;
		}
		if ($this->metaTablesSQL) {
			$save = $ADODB_FETCH_MODE; 
			$ADODB_FETCH_MODE = ADODB_FETCH_NUM; 
			
			if ($this->fetchMode !== false) $savem = $this->SetFetchMode(false);
			
			$rs = $this->Execute($this->metaTablesSQL);
			if (isset($savem)) $this->SetFetchMode($savem);
			$ADODB_FETCH_MODE = $save; 
			
			if ($rs === false) return $false;
			$arr =& $rs->GetArray();
			$arr2 = array();
			
			if ($hast = ($ttype && isset($arr[0][1]))) { 
				$showt = strncmp($ttype,'T',1);
			}
			
			for ($i=0; $i < sizeof($arr); $i++) {
				if ($hast) {
					if ($showt == 0) {
						if (strncmp($arr[$i][1],'T',1) == 0) $arr2[] = trim($arr[$i][0]);
					} else {
						if (strncmp($arr[$i][1],'V',1) == 0) $arr2[] = trim($arr[$i][0]);
					}
				} else
					$arr2[] = trim($arr[$i][0]);
			}
			$rs->Close();
			return $arr2;
		}
		return $false;
	}

	function _findschema(&$table,&$schema)
	{
		if (!$schema && ($at = strpos($table,'.')) !== false) {
			$schema = substr($table,0,$at);
			$table = substr($table,$at+1);
		}
	}

	/**
	 * List columns in a database as an array of ADOFieldObjects. 
	 * See top of file for definition of object.
	 *
	 * @param $table	table name to query
	 * @param $normalize	makes table name case-insensitive (required by some databases)
	 * @schema is optional database schema to use - not supported by all databases.
	 *
	 * @return  array of ADOFieldObjects for current table.
	 */
	function &MetaColumns($tab)
	{
	  global $ADODB_FETCH_MODE;
	  $false = false;
	  $save = $ADODB_FETCH_MODE;
	  $ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
	  if ($this->fetchMode !== false) $savem = $this->SetFetchMode(false);
	  $rs = $this->Execute("PRAGMA table_info('$tab')");
	  if (isset($savem)) $this->SetFetchMode($savem);
	  if (!$rs) {
	    $ADODB_FETCH_MODE = $save; 
	    return $false;
	  }
	  $arr = array();
	  while ($r = $rs->FetchRow()) {
	    $type = explode('(',$r['type']);
	    $size = '';
	    if (sizeof($type)==2)
	    $size = trim($type[1],')');
	    $fn = strtoupper($r['name']);
	    $fld = new ADOFieldObject;
	    $fld->name = $r['name'];
	    $fld->type = $type[0];
	    $fld->max_length = $size;
	    $fld->not_null = $r['notnull'];
	    $fld->default_value = $r['dflt_value'];
	    $fld->scale = 0;
	    if ($save == ADODB_FETCH_NUM) $arr[] = $fld;	
	    else $arr[strtoupper($fld->name)] = $fld;
	  }
	  $rs->Close();
	  $ADODB_FETCH_MODE = $save;
	  return $arr;
	}

	/**
	  * List indexes on a table as an array.
	  * @param table  table name to query
	  * @param primary true to only show primary keys. Not actually used for most databases
	  *
	  * @return array of indexes on current table. Each element represents an index, and is itself an associative array.
	  
		 Array (
			[name_of_index] => Array
			  (
			  [unique] => true or false
			  [columns] => Array
			  (
			  	[0] => firstname
			  	[1] => lastname
			  )
		)		
	  */
	function &MetaIndexes($table, $primary = FALSE, $owner=false)
	{
		$false = false;
		// save old fetch mode
        global $ADODB_FETCH_MODE;
        $save = $ADODB_FETCH_MODE;
        $ADODB_FETCH_MODE = ADODB_FETCH_NUM;
        if ($this->fetchMode !== FALSE) {
               $savem = $this->SetFetchMode(FALSE);
        }
		$SQL=sprintf("SELECT name,sql FROM sqlite_master WHERE type='index' AND tbl_name='%s'", strtolower($table));
        $rs = $this->Execute($SQL);
        if (!is_object($rs)) {
			if (isset($savem)) 
				$this->SetFetchMode($savem);
			$ADODB_FETCH_MODE = $save;
            return $false;
        }

		$indexes = array ();
		while ($row = $rs->FetchRow()) {
			if ($primary && preg_match("/primary/i",$row[1]) == 0) continue;
            if (!isset($indexes[$row[0]])) {

			$indexes[$row[0]] = array(
				   'unique' => preg_match("/unique/i",$row[1]),
				   'columns' => array());
			}
			/**
			  * There must be a more elegant way of doing this,
			  * the index elements appear in the SQL statement
			  * in cols[1] between parentheses
			  * e.g CREATE UNIQUE INDEX ware_0 ON warehouse (org,warehouse)
			  */
			$cols = explode("(",$row[1]);
			$cols = explode(")",$cols[1]);
			array_pop($cols);
			$indexes[$row[0]]['columns'] = $cols;
		}
		if (isset($savem)) { 
            $this->SetFetchMode($savem);
			$ADODB_FETCH_MODE = $save;
		}
        return $indexes;
	}

	/**
	 * List columns names in a table as an array. 
	 * @param table	table name to query
	 *
	 * @return  array of column names for current table.
	 */ 
	function &MetaColumnNames($table, $numIndexes=false,$useattnum=false /* only for postgres */) 
	{
		$objarr =& $this->MetaColumns($table);
		if (!is_array($objarr)) {
			$false = false;
			return $false;
		}
		$arr = array();
		if ($numIndexes) {
			$i = 0;
			if ($useattnum) {
				foreach($objarr as $v) 
					$arr[$v->attnum] = $v->name;
				
			} else
				foreach($objarr as $v) $arr[$i++] = $v->name;
		} else
			foreach($objarr as $v) $arr[strtoupper($v->name)] = $v->name;
		
		return $arr;
	}

	function MetaTransaction($mode,$db)
	{
		$mode = strtoupper($mode);
		$mode = str_replace('ISOLATION LEVEL ','',$mode);
		
		switch($mode) {

		case 'READ UNCOMMITTED':
			switch($db) { 
			case 'oci8':
			case 'oracle':
				return 'ISOLATION LEVEL READ COMMITTED';
			default:
				return 'ISOLATION LEVEL READ UNCOMMITTED';
			}
			break;
					
		case 'READ COMMITTED':
				return 'ISOLATION LEVEL READ COMMITTED';
			break;
			
		case 'REPEATABLE READ':
			switch($db) {
			case 'oci8':
			case 'oracle':
				return 'ISOLATION LEVEL SERIALIZABLE';
			default:
				return 'ISOLATION LEVEL REPEATABLE READ';
			}
			break;
			
		case 'SERIALIZABLE':
				return 'ISOLATION LEVEL SERIALIZABLE';
			break;
			
		default:
			return $mode;
		}
	}

}

eval('class sqlitepo_meta_resultset_EXTENDER extends '. $last_module . '_ResultSet { }');

class sqlitepo_meta_ResultSet extends sqlitepo_meta_resultset_EXTENDER
{
	/**
	 * Get the metatype of the column. This is used for formatting. This is because
	 * many databases use different names for the same type, so we transform the original
	 * type to our standardised version which uses 1 character codes:
	 *
	 * @param t  is the type passed in. Normally is ADOFieldObject->type.
	 * @param len is the maximum length of that field. This is because we treat character
	 * 	fields bigger than a certain size as a 'B' (blob).
	 * @param fieldobj is the field object returned by the database driver. Can hold
	 *	additional info (eg. primary_key for mysql).
	 * 
	 * @return the general type of the data: 
	 *	C for character < 250 chars
	 *	X for teXt (>= 250 chars)
	 *	B for Binary
	 * 	N for numeric or floating point
	 *	D for date
	 *	T for timestamp
	 * 	L for logical/Boolean
	 *	I for integer
	 *	R for autoincrement counter/integer
	 * 
	 *
	*/
	function MetaType($t,$len=-1,$fieldobj=false)
	{
		if (is_object($t)) {
			$fieldobj = $t;
			$t = $fieldobj->type;
			$len = $fieldobj->max_length;
		}
		
		$len = -1; // mysql max_length is not accurate
		switch (strtoupper($t)) {
		case 'STRING': 
		case 'CHAR':
		case 'VARCHAR': 
		case 'TINYBLOB': 
		case 'TINYTEXT': 
		case 'ENUM': 
		case 'SET': 
			if ($len <= $this->blobSize) return 'C';
			
		case 'TEXT':
		case 'LONGTEXT': 
		case 'MEDIUMTEXT':
			return 'X';
			
		// php_mysql extension always returns 'blob' even if 'text'
		// so we have to check whether binary...
		case 'IMAGE':
		case 'LONGBLOB': 
		case 'BLOB':
		case 'MEDIUMBLOB':
			return !empty($fieldobj->binary) ? 'B' : 'X';
			
		case 'YEAR':
		case 'DATE': return 'D';
		
		case 'TIME':
		case 'DATETIME':
		case 'TIMESTAMP': return 'T';
		
		case 'INT': 
		case 'INTEGER':
		case 'BIGINT':
		case 'TINYINT':
		case 'MEDIUMINT':
		case 'SMALLINT': 
			
			if (!empty($fieldobj->primary_key)) return 'R';
			else return 'I';
		
		default:
			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
		##
		'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',
		'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'
		);
		
		$tmap = false;
		$t = strtoupper($t);
		$tmap = (isset($typeMap[$t])) ? $typeMap[$t] : 'N';
			if ($t == 'LONG' && $this->dataProvider == 'oci8') return 'B';
			return $tmap;
		}
	}

}

?>