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php封装mysql类
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 '
';<br>$mysql = new Mysql();<br>print_r($mysql); <p>$sql = "insert into stu values (4,'wangwu','99998')";</p> <p>if($mysql->query($sql)){<br> echo "query成功";<br>}else {<br> echo "失败";<br>}</p> <p>echo "<br>";</p> <p>$sql = "select * from stu";<br>$arr = $mysql->getAll($sql);</p> <p>print_r($arr);<br>?><br></p>