adodb-pdo_mysql.inc.php

远程教育系统

<?php


/*
V4.94 23 Jan 2007  (c) 2000-2007 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.
  Set tabs to 8.
 
*/ 

class ADODB_pdo_mysql extends ADODB_pdo {
	var $metaTablesSQL = "SHOW TABLES";	
	var $metaColumnsSQL = "SHOW COLUMNS FROM `%s`";
	var $sysDate = 'CURDATE()';
	var $sysTimeStamp = 'NOW()';
	var $nameQuote = '`';

	function _init($parentDriver)
	{
	
		$parentDriver->hasTransactions = false;
		$parentDriver->_bindInputArray = false;
		$parentDriver->hasInsertID = true;
		$parentDriver->_connectionID->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY,true);
	}
	
		// dayFraction is a day in floating point
	function OffsetDate($dayFraction,$date=false)
	{		
		if (!$date) $date = $this->sysDate;
		
		$fraction = $dayFraction * 24 * 3600;
		return $date . ' + INTERVAL ' .	 $fraction.' SECOND';
		
//		return "from_unixtime(unix_timestamp($date)+$fraction)";
	}
	
	function ServerInfo()
	{
		$arr['description'] = ADOConnection::GetOne("select version()");
		$arr['version'] = ADOConnection::_findvers($arr['description']);
		return $arr;
	}
	
	function &MetaTables($ttype=false,$showSchema=false,$mask=false) 
	{	
		$save = $this->metaTablesSQL;
		if ($showSchema && is_string($showSchema)) {
			$this->metaTablesSQL .= " from $showSchema";
		}
		
		if ($mask) {
			$mask = $this->qstr($mask);
			$this->metaTablesSQL .= " like $mask";
		}
		$ret =& ADOConnection::MetaTables($ttype,$showSchema);
		
		$this->metaTablesSQL = $save;
		return $ret;
	}
	
	function SetTransactionMode( $transaction_mode ) 
	{
		$this->_transmode  = $transaction_mode;
		if (empty($transaction_mode)) {
			$this->Execute('SET TRANSACTION ISOLATION LEVEL REPEATABLE READ');
			return;
		}
		if (!stristr($transaction_mode,'isolation')) $transaction_mode = 'ISOLATION LEVEL '.$transaction_mode;
		$this->Execute("SET SESSION TRANSACTION ".$transaction_mode);
	}
	
 	function &MetaColumns($table) 
	{
		$this->_findschema($table,$schema);
		if ($schema) {
			$dbName = $this->database;
			$this->SelectDB($schema);
		}
		global $ADODB_FETCH_MODE;
		$save = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
		
		if ($this->fetchMode !== false) $savem = $this->SetFetchMode(false);
		$rs = $this->Execute(sprintf($this->metaColumnsSQL,$table));
		
		if ($schema) {
			$this->SelectDB($dbName);
		}
		
		if (isset($savem)) $this->SetFetchMode($savem);
		$ADODB_FETCH_MODE = $save;
		if (!is_object($rs)) {
			$false = false;
			return $false;
		}
			
		$retarr = array();
		while (!$rs->EOF){
			$fld = new ADOFieldObject();
			$fld->name = $rs->fields[0];
			$type = $rs->fields[1];
			
			// split type into type(length):
			$fld->scale = null;
			if (preg_match("/^(.+)\((\d+),(\d+)/", $type, $query_array)) {
				$fld->type = $query_array[1];
				$fld->max_length = is_numeric($query_array[2]) ? $query_array[2] : -1;
				$fld->scale = is_numeric($query_array[3]) ? $query_array[3] : -1;
			} elseif (preg_match("/^(.+)\((\d+)/", $type, $query_array)) {
				$fld->type = $query_array[1];
				$fld->max_length = is_numeric($query_array[2]) ? $query_array[2] : -1;
			} elseif (preg_match("/^(enum)\((.*)\)$/i", $type, $query_array)) {
				$fld->type = $query_array[1];
				$arr = explode(",",$query_array[2]);
				$fld->enums = $arr;
				$zlen = max(array_map("strlen",$arr)) - 2; // PHP >= 4.0.6
				$fld->max_length = ($zlen > 0) ? $zlen : 1;
			} else {
				$fld->type = $type;
				$fld->max_length = -1;
			}
			$fld->not_null = ($rs->fields[2] != 'YES');
			$fld->primary_key = ($rs->fields[3] == 'PRI');
			$fld->auto_increment = (strpos($rs->fields[5], 'auto_increment') !== false);
			$fld->binary = (strpos($type,'blob') !== false);
			$fld->unsigned = (strpos($type,'unsigned') !== false);
				
			if (!$fld->binary) {
				$d = $rs->fields[4];
				if ($d != '' && $d != 'NULL') {
					$fld->has_default = true;
					$fld->default_value = $d;
				} else {
					$fld->has_default = false;
				}
			}
			
			if ($save == ADODB_FETCH_NUM) {
				$retarr[] = $fld;
			} else {
				$retarr[strtoupper($fld->name)] = $fld;
			}
				$rs->MoveNext();
			}
		
			$rs->Close();
			return $retarr;	
	}
		
	
	// parameters use PostgreSQL convention, not MySQL
	function &SelectLimit($sql,$nrows=-1,$offset=-1,$inputarr=false,$secs=0)
	{
		$offsetStr =($offset>=0) ? "$offset," : '';
		// jason judge, see http://phplens.com/lens/lensforum/msgs.php?id=9220
		if ($nrows < 0) $nrows = '18446744073709551615'; 
		
		if ($secs)
			$rs =& $this->CacheExecute($secs,$sql." LIMIT $offsetStr$nrows",$inputarr);
		else
			$rs =& $this->Execute($sql." LIMIT $offsetStr$nrows",$inputarr);
		return $rs;
	}
}
?>