php使用mysql封装函数删除表数据

php删除mysql表中数据：

function opendatabase ($host,$user,$pass) {

try {

if ($db = mysql_connect ($host,$pass)){

return $db;

} else {

throw new exception ("Sorry,could not connect to mysql.");

}

} catch (exception $e) {

echo $e->getmessage ();

}

}

/* http://www.manongjc.com/article/1239.html */

function selectdb ($whichdb,$db){

try {

if (!mysql_select_db ($whichdb,$db)){

throw new exception ("Sorry,database could not be opened.");

}

} catch (exception $e) {

echo $e->getmessage();

}

}

function closedatabase ($db){

mysql_close ($db);

}

$db = opendatabase ("localhost","root","");

selectdb ("mydatabase",$db);

$updatequery = "DELETE FROM mytable WHERE id=2";

try {

if (mysql_query ($updatequery,$db)){

echo "Your record has been removed.";

if ($aquery = mysql_query ("SELECT * FROM mytable WHERE id=2")){

echo "
" . mysql_num_rows ($aquery);

} else {

echo mysql_error();

}

} else {

throw new exception (mysql_error());

}

} catch (exception $e) {

echo $e->getmessage();

}

closedatabase ($db);

?>

从上面源码可以看出，我们把mysql_connect封装到opendatabase函数中，如果需要连接mysql服务器，直接调用opendatabase函数即可，同理，

mysql_select_db、mysql_close都分别封装到selectdb和closedatabase函数中，如果需要选择数据库操作和关闭数据库操作，只需要分别调用selectdb和closedatabase函数即可。

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