链接数据库:
$conn = mysql_connect("localhost","数据库用户名","数据库密码") or die("连接数据库错误!!");
mysql_select_db("book") or die("连接数据表出错!!");
查询并循环输出多条数据:
$sql = "select * from bookinfo";
$result = mysql_query($sql);
while($row = mysql_fetch_array($result)){
echo $row['bookName'];
}