php mysql 完整例子

function getConnection(){
@mysql_connect("localhost","username","password") or die("无法连接数据库");
@mysql_select_db("databasename") or die("未找到数据库");
}

getConnection();
$query="select definition,accession,gi from birds_nucleotide order by definition limit 0,200";
$result=mysql_query($query);
if(!$result){
echo "查询失败";
return false;
}
$resultCount=mysql_num_rows($result);
for ($count = 0; $count<$resultCount; $count++) {
//处理...
echo mysql_result($result, $count,"definition");
}