php示例代码之使用mysqli对象

<?php
//连接参数
$host="localhost";
$user="root";
$pwd="111111";
$db="test";

$mysqli =new mysqli($host,$user,$pwd,$db); //实例化一个mysqli对象,并打开一个连接

if(mysqli_connect_errno()){ //检查是否可以正确打开数据库
echo "<font color='red'>unable to connect!</font>";
}

$SQL_SELECT_SYMBOLS="select * from symbols";

if($result=$mysqli->query($SQL_SELECT_SYMBOLS)){
if($result->num_rows>0){

echo '<table cellpadding="10" border="1">';
echo '<tr><th>id</th><th>country</th><th>animal</th><th>cname</th></tr>';
while($arr=$result->fetch_array()){
echo "<tr>";
echo "<td>".$arr[0]."</td>";
echo "<td>".$arr[1]."</td>";
echo "<td>".$arr[2]."</td>";
echo "<td>".$arr[3]."</td>";
echo "</tr>";
}
echo "</table>";
}
else{
echo "记录未找到!";
}

$result->close(); //释放记录集所占用的内存
}
else{
echo "error in query:$query.".$mysqli->error;
}
$mysqli->close(); //关闭数据库连接
?>