php实现mysql封装类示例_php实例

代码如下:

class Mysql {
private $host;
private $user;
private $pwd;
private $dbName;
private $charset;

private $conn = null;

public function __construct() {

$this->host = 'localhost';
$this->user = 'root';
$this->pwd = 'root';
$this->dbName = 'test';

$this->connect($this->host,$this->user,$this->pwd);

$this->switchDb($this->dbName);

$this->setChar($this->charset);
}

//负责链接
private function connect($h,$u,$p) {
$conn = mysql_connect($h,$u,$p);
$this->conn = $conn;
}

//负责切换数据库
public function switchDb($db) {
$sql = 'use' . $db;
$this->query($sql);
}

//负责设置字符集
public function setChar($char) {
$sql = 'set names' . $char;
$this->query($sql);
}

//负责发送sql查询
public function query($sql) {
return mysql_query($sql,$this->conn);
}

//负责获取多行多列的select结果
public function getAll($sql) {
$list = array();

$rs = $this->query($sql);
if (!$rs) {
return false;
}

while ($row = mysql_fetch_assoc($rs)) {
$list[] = $row;
}

return $list;
}

public function getRow($sql) {
$rs = $this->query($sql);

if(!$rs) {
return false;
}

return mysql_fetch_assoc($rs);
}

public function getOne($sql) {
$rs = $this->query($sql);
if (!$rs) {
return false;
}
return mysql_fetch_assoc($rs);

return $row[0];
}

public function close() {
mysql_close($this->conn);
}
}

echo '

';
$mysql = new Mysql();
print_r($mysql);

$sql = "insert into stu values (4,'wangwu','99998')";
if($mysql->query($sql)){
 echo "query成功";
}else {
 echo "失败";
}
echo "
";
$sql = "select * from stu";
$arr = $mysql->getAll($sql);
print_r($arr);
?>