关于mysql：PHP数据库连接类

PHP database connection class

我试图从一个类中的数据库获取用户ID，但是我对类的经验很少甚至没有，如何从数据库中获取uid然后返回uid？

基本上就是这样，

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class hello {
public function getUid(){
//connect to the db
//get all of the users info
$array = mysql_fetch_array($result);
$uid = $array['uid'];

return $uid;
}
}

就像我说的那样，我还是新手，所以任何建议或帮助都将不胜感激！

预先感谢！

首先构建一个MySQL类库...以适合此样例片段中的要求：

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<?php

include '../config/Dbconfig.php';

class Mysql extends Dbconfig {

public $connectionString;
public $dataSet;
private $sqlQuery;

protected $databaseName;
protected $hostName;
protected $userName;
protected $passCode;

function Mysql() {
$this -> connectionString = NULL;
$this -> sqlQuery = NULL;
$this -> dataSet = NULL;

$dbPara = new Dbconfig();
$this -> databaseName = $dbPara -> dbName;
$this -> hostName = $dbPara -> serverName;
$this -> userName = $dbPara -> userName;
$this -> passCode = $dbPara ->passCode;
$dbPara = NULL;
}

function dbConnect() {
$this -> connectionString = mysql_connect($this -> serverName,$this -> userName,$this -> passCode);
mysql_select_db($this -> databaseName,$this -> connectionString);
return $this -> connectionString;
}

function dbDisconnect() {
$this -> connectionString = NULL;
$this -> sqlQuery = NULL;
$this -> dataSet = NULL;
$this -> databaseName = NULL;
$this -> hostName = NULL;
$this -> userName = NULL;
$this -> passCode = NULL;
}

function selectAll($tableName) {
$this -> sqlQuery = 'SELECT * FROM '.$this -> databaseName.'.'.$tableName;
$this -> dataSet = mysql_query($this -> sqlQuery,$this -> connectionString);
return $this -> dataSet;
}

function selectWhere($tableName,$rowName,$operator,$value,$valueType) {
$this -> sqlQuery = 'SELECT * FROM '.$tableName.' WHERE '.$rowName.' '.$operator.' ';
if($valueType == 'int') {
$this -> sqlQuery .= $value;
}
else if($valueType == 'char') {
$this -> sqlQuery .="'".$value."'";
}
$this -> dataSet = mysql_query($this -> sqlQuery,$this -> connectionString);
$this -> sqlQuery = NULL;
return $this -> dataSet;
#return $this -> sqlQuery;
}

function insertInto($tableName,$values) {
$i = NULL;

$this -> sqlQuery = 'INSERT INTO '.$tableName.' VALUES (';
$i = 0;
while($values[$i]["val"] != NULL && $values[$i]["type"] != NULL) {
if($values[$i]["type"] =="char") {
$this -> sqlQuery .="'";
$this -> sqlQuery .= $values[$i]["val"];
$this -> sqlQuery .="'";
}
else if($values[$i]["type"] == 'int') {
$this -> sqlQuery .= $values[$i]["val"];
}
$i++;
if($values[$i]["val"] != NULL) {
$this -> sqlQuery .= ',';
}
}
$this -> sqlQuery .= ')';
#echo $this -> sqlQuery;
mysql_query($this -> sqlQuery,$this ->connectionString);
return $this -> sqlQuery;
#$this -> sqlQuery = NULL;
}

function selectFreeRun($query) {
$this -> dataSet = mysql_query($query,$this -> connectionString);
return $this -> dataSet;
}

function freeRun($query) {
return mysql_query($query,$this -> connectionString);
}
}
?>

和配置文件...

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<?php
class Dbconfig {
protected $serverName;
protected $userName;
protected $passCode;
protected $dbName;

function Dbconfig() {
$this -> serverName = 'localhost';
$this -> userName = 'root';
$this -> passCode = 'pass';
$this -> dbName = 'dbase';
}
}
?>

相关讨论

您可以使用自定义数据库类。
代码：

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<?php
Class Database
{
private $user ;
private $host;
private $pass ;
private $db;

public function __construct()
{
$this->user ="root";
$this->host ="localhost";
$this->pass ="";
$this->db ="db_blog";
}
public function connect()
{
$link = mysql_connect($this->user, $this->host, $this->pass, $this->db);
return $link;
}
}
?>

编写代码的方式有问题，而不是类的问题。仔细看看这条线：

1	$array = mysql_fetch_array($result);

这是函数中第一次出现变量$result。因此，不可能与数据库进行通信。

可能的伪代码为：

连接到数据库服务器
查询数据库
获取结果
返回uid字段。

首先查看相关文档：

http://php.net/manual/zh/function.mysql-connect.php
http://www.php.net/manual/zh/function.mysql-query.php
http://www.php.net/manual/zh/function.mysql-fetch-array.php

创建两个类。一种用于处理数据库，第二种用于管理用户或身份验证数据。
对于SQL类，创建方法connect()，query()，fetch()等
对于User类，创建方法get($ id)等

请尝试以下操作：

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ini_set("display_errors", 'off');
ini_set("error_reporting",E_ALL);

class myclass {
function myclass() {
$user ="root";
$pass ="";
$server ="localhost";
$dbase ="";

$conn = mysql_connect($server,$user,$pass);
if(!$conn)
{
$this->error("Connection attempt failed");
}
if(!mysql_select_db($dbase,$conn))
{
$this->error("Dbase Select failed");
}
$this->CONN = $conn;
return true;
}
function close() {
$conn = $this->CONN ;
$close = mysql_close($conn);
if(!$close)
{
$this->error("Connection close failed");
}
return true;
} function sql_query($sql="") {
if(empty($sql))
{
return false;
}
if(empty($this->CONN))
{
return false;
}
$conn = $this->CONN;
$results = mysql_query($sql,$conn) or die("Query Failed.." . mysql_error());
if(!$results)
{
$message ="Bad Query !";
$this->error($message);
return false;
}
if(!(eregi("^select",$sql) || eregi("^show",$sql)))
{
return true;
}
else
{
$count = 0;
$data = array();
while($row = mysql_fetch_array($results))
{
$data[$count] = $row;
$count++;
}
mysql_free_result($results);
return $data;
}
}
}
$obj = new myclass();
$obj->sql_query("");