我正在尝试从类中的数据库中获取用户 ID，但我几乎没有使用类的经验，我该如何从数据库中获取 uid 然后返回 uid？
所以基本上是这样的，
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，我还是新手，所以任何建议或帮助都将不胜感激！
提前谢谢！
【问题讨论】：
首先构建一个 MySQL 类库...适合此示例中的要求：
<?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);
}
}
?>
还有配置文件...
<?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';
}
}
?>
【讨论】：
好的，一条建议：
做任何事都是有原因的。不要使用你不知道的东西。而是去学习它们。
对于这个特定问题，有人可能会给你一个答案，但直到你不知道 Object Oriented 是什么意思以及为什么会有 classes 之前，你不应该使用它们。
【讨论】：
您可以使用自定义数据库类。
代码：
<?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;
}
}
?>
【讨论】：
【讨论】：
您的代码编写方式存在问题，而不是类。仔细看看这一行：
$array = mysql_fetch_array($result);
这是变量$result第一次出现在函数中。因此，无法与数据库进行通信。
可能的伪代码是：
uid 字段。先看看相关文档：
【讨论】：
尝试以下操作：
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,$conn) or die("Query Failed..<hr>" . mysql_error());
if(!$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("");
【讨论】：