php db类库进行数据库操作

require_once "DB.php"; //包含类库文件
$conn = DB::connect("mysql://root:1981427@localhost/test"); //连接数据库
if (!DB::isError($conn)) { //判断是否连接成功
print "数据库连接成功";
}
else
{
echo "数据库连接失败！";
}
?>

require_once "DB.php";
$conn = DB::connect("mysql://root:1981427@localhost/test"); //调用connect连接数据库
if (DB::isError($conn)) //如果连接出错则报错
{
print "数据库连接失败";
}
$rs = $conn->query("select id,username,password from tablename1"); //执行SQL语句
if (DB::isError($rs)) //判断是否执行成功
{
print "数据查询失败";
}
while ($rs->fetchInto($rows)) //循环输出查询结果
{
print "编号号：$rows[0]
";
print "姓名：$rows[1]
";
print "密码：$rows[2]
";
print "

---

";
}
?>

require_once "DB.php";
$conn = DB::connect("mysql://root:1981427@localhost/test"); //调用connect连接数据库
if (DB::isError($conn)) //如果连接出错则报错
{
print "数据库连接失败";
}
//执行SQL语句，从第0条开始返回1条记录
$rs = $conn->limitQuery("select id,password from tablename1",2,5); //查询出记录集中第三个到第六个数据
if (DB::isError($rs)) //如果查询出错则报错
{
print "数据查询失败";
}
while ($rs->fetchInto($rows)) //循环输出查询结果
{
print "编号：$rows[0]
";
print "姓名：$rows[1]
";
print "密码：$rows[2]
";
print "

---

";
}
?>

require_once "DB.php";
$conn = DB::connect("mysql://root:1981427@localhost/test"); //连接数据库
if (DB::isError($conn))
{
print "数据库连接失败";
}
//使用prepare函数准备SQL语句
$rs = $conn->prepare("update tablename1 set password = 'Susan' where id = '1'");
if (DB::isError($rs))
{
print "数据更新失败";
}
else
{
$conn->execute($rs); //执行SQL语句更新数据库
print "数据更新成功";
}
?>