我是 PDO 的新手。我听说程序员在项目中使用多个数据库更友好,而且更安全,所以我想学习 PDO 。我想使用 PDO 将数据插入 MySQL ,但我不能,并且没有错误消息。我使用了以下代码:
<?php
class ManageUsers02 {
private $db_con;
public $db_host = "localhost"; // I run this code on my localhost
public $db_name = "todo"; // database name
public $db_user = "root"; // username
public $db_pass = ""; // password
function __construct() {
try {
// connect to database using PDO
$this->db_con = new PDO("mysql:host=$this->db_host;db_name=$this->db_name", $this->db_user, $this->db_pass);
} catch (PDOException $exc) { // PDO exception handling
echo $exc->getMessage();
}
}
public function reg_user($username, $password, $ip_address, $reg_date, $reg_time ) {
try {
// preparing sql query
$query = $this->db_con->prepare("INSERT INTO user_reg (username, password, ip_address, reg_date, reg_time) VALUES ( ?, ?, ?, ?, ? )");
}
catch( PDOException $exc ) { // PDO exception handling
echo $exc->getMessage();
}
try {
// execute sql query
$query->execute(array($username, $password, $ip_address, $reg_date, $reg_time));
}
catch( PDOException $exc ) {
echo $exc->getMessage();
}
$counts = $query->rowCount(); // return value of affected row
// here it should be return 1
echo "<br /> count :: <b> " . $counts . "</b> <br />"; // shows result 0
// no value inserted
}
}
$user_reg = new ManageUsers02();
$user_reg->reg_user('pdo_name', 'pdo_password', '127.0.0.1', '2013-2-6', '4:20 am');
?>
答案 0 :(得分:0)
由于将字符串插入mysql Time字段,因此失败。
$sql = "INSERT INTO user_reg ( ... , reg_time) VALUES (..., '4:20 am');
如果您想使用'4:20 am'
,请使用。
TIME( STR_TO_DATE( ? , '%h:%i %p' ))
像
$sql = "INSERT INTO user_reg ( ... , reg_time) VALUES
( ?, ?, ?, ?, TIME( STR_TO_DATE( ? , '%h:%i %p' )))";
并为课程提供ok
和counts
。
<?php
class ManageUsers02 {
...
public $counts = 0;
public $ok = false;
function __construct() {
try {
$this->db_con = new PDO("mysql:dbname=$this->db_name;host=$this->db_host", $this->db_user, $this->db_pass);
} catch (PDOException $exc) { // PDO exception handling
echo $exc->getMessage();
return;
}
if (!$this->db_con) {
return;
}
$this->ok = true;
}
public function reg_user($username, $password, $ip_address, $reg_date, $reg_time ) {
$this->counts = 0;
$this->ok = false;
$sql = "INSERT INTO user_reg (username, password, ip_address,
reg_date, reg_time) VALUES
( ?, ?, ?, ?, TIME( STR_TO_DATE( ? , '%h:%i %p' )))";
try {
$query = $this->db_con->prepare($sql);
}
catch( PDOException $exc ) { // PDO exception handling
echo $exc->getMessage();
return;
}
if (!$query) {
return;
}
try {
$this->ok = $query->execute(array($username, $password, $ip_address, $reg_date, $reg_time));
}
catch( PDOException $exc ) {
echo $exc->getMessage();
$this->ok = false;
return;
}
if ($this->ok) {
$this->counts = $query->rowCount(); // return value of affected row
}
}
}
$user_reg = new ManageUsers02();
if ($user_reg->ok) {
$user_reg->reg_user('pdo_name4', 'pdo_password4',
'127.0.0.1', '2013-2-6', '04:20 am' );
if ($user_reg->ok) {
echo "<br /> count :: <b> " . $user_reg->counts . "</b> <br />";
} else { echo "Error : Insert failed";}
} else { echo "Error : Connection failed: ";}
?>
答案 1 :(得分:0)
+1来自@ moskito-x的答案,用于发现错误的时间格式。但是您的代码还存在其他一些功能问题。
$this->db_con = new PDO("mysql:host=$this->db_host;db_name=$this->db_name", ...
您需要在DSN中使用dbname
,而不是db_name
。见http://www.php.net/manual/en/ref.pdo-mysql.connection.php
$this->db_con = new PDO("mysql:host=$this->db_host;dbname=$this->db_name", ...
您还需要启用错误模式,如下所示:
$this->db_con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
如果不这样做,PDO不会在prepare()或execute()上抛出异常,但如果出现错误,这些函数只返回 false 。
答案 2 :(得分:-1)
我不知道您的插件有什么特别的问题,但是您的实现非常糟糕。按设计。
首先你必须摆脱类中的PDO连接代码。您必须单独创建一个PDO实例,然后只在构造函数中传递它。
其次,你必须摆脱所有这些try..catch,这会使你的代码膨胀,没有丝毫的好处。
此外,无类方法应输出单个字节,但仅返回。
所以,它必须像
<?php
ini_set('display_errors',1);
error_reporting(E_ALL);
$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$opt = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
);
$pdo = new PDO($dsn, $user, $pass, $opt);
class ManageUsers02
{
private $db_con;
function __construct($db_con)
{
$this->db_con = $db_con;
}
public function reg_user($username, $password, $ip_address, $reg_date, $reg_time )
{
$sql "INSERT INTO user_reg (username, password, ip_address, reg_date, reg_time)
VALUES ( ?, ?, ?, ?, ? )";
$query = $this->db_con->prepare($sql);
$query->execute(array($username, $password, $ip_address, $reg_date, $reg_time));
return $counts = $query->rowCount(); // return value of affected ro
}
}
$user_reg = new ManageUsers02($pdo);
$count = $user_reg->reg_user('pdo_name', 'pdo_password', '127.0.0.1', '2013-2-6', '4:20 am');
var_dump($count);
此设置至少会告诉您是否出现问题。