来自操作的评论引用（目前的最后一条评论）：
主要问题是，它不会删除。尽管 sql
直接在 phpmyadmin 中测试时，该语句是正确的。次要的
问题是，它也会说是真的。即使它没有删除。
Machavity 解决了次要问题。主要遗骸。 -
码农
TLDR: // 注意：PDOStatement::execute .... 成功时返回 TRUE，失败时返回 FALSE。
这就是为什么它总是为你返回 1。请参阅下面的 2 个文件，以使用 PDOStatement 对象的 rowCount() 进行更改来测试这一点。
您在 cmets 中说主要问题仍然存在。在手工制作数据库类之后，我使用下面的内容没有问题，因为你没有提供一个（你提到了一个）。注意 try/catch 块的使用。
坦率地说，我们不知道您是否有任何异常或您如何处理它们，或者您是否已激活错误报告。假设 pdo 对象可以成功返回 rowCount() 值，则以下内容应该能够通过任何测试。
用于测试的架构：
create table product_area
( product_area_id int primary key,
theName varchar(100) not null
);
-- blockA begin
truncate product_area;
insert product_area (product_area_id,theName) values
(1,'Houston zone B'),(2,'Houston zone BH'),(20,'Houston zone Z');
-- blockA end
测试文件：
对于测试文件，只有几行代码在靠近顶部的“迷你测试区”部分进行测试
<?php
// pdo_del_test_20160703.php
// related to answering http://stackoverflow.com/questions/38061597 at the moment
error_reporting(E_ALL);
ini_set("display_errors", 1);
include "myPDO_DB.php"; // Database class. The class name = myPDO_DB
// Mini test area BEGIN:
$a1=new aClass();
$ret=$a1->deleteArea(2);
echo "retValue=".$ret."<br>";
// Mini test area ... END
class aClass {
private $db=null;
public function __construct(){
echo "in constructor1<br>";
$this->db=new myPDO_DB();
echo "in constructor2<br>";
//$this->db=null;
echo "in constructor3<br>";
}
public function deleteArea($product_area_id){
$this->db->query("
DELETE
FROM product_area
WHERE product_area_id = :product_area_id
LIMIT 1
");
// Note: PDOStatement::execute .... Returns TRUE on success or FALSE on failure.
//
// so on a Delete call, it just says sure, OK, done with that (if no exception)
// It doesn't give feedback natively as to whether or not a row was actually deleted
//
//bind
$this->db->bind(':product_area_id', $product_area_id);
//Execute
// Don't forget to run schema `blockA` before testing (so that data is there)
if ($this->db->execute()) { // if this function returns anything other than TRUE you have exception problems
$pdo_rowcount=$this->db->stmt->rowCount(); // see http://php.net/manual/en/pdostatement.rowcount.php
// Depending on your systems ability to get pdo.rowCount() to work, consider the following
// Please see http://dev.mysql.com/doc/refman/5.7/en/information-functions.html#function_row-count
$this->db->query("select row_count()"); // from mysql "Information Functions". Based on prior mysql call.
$mysql_rowcount=$this->db->execute();
// but note, row_count() in mysql is not exactly a solution for the majority of systems out there.
// http://www.heidisql.com/forum.php?t=9791
// on mysql 5.5 and my 5.6.24, it returns 0
// so depending on your system, you will choose between $pdo_rowcount and $mysql_rowcount
return $pdo_rowcount; // your best bet, bust test it on your setup.
}
else {
// do something
return 0; // you would have already endured an exception though
}
}
}
?>
数据库类：
<?php
// myPDO_DB.php
//
error_reporting(E_ALL);
ini_set("display_errors", 1);
include "db_connect_info.php"; // brings in the "defines" .. Shoot for a secure o/s vault in this file.
class myPDO_DB {
// will grab the stub from http://culttt.com/2012/10/01/roll-your-own-pdo-php-class/
//
// and then build your class into it (because you did not provide it)
//
// and then further improve it with try/catch blocks that were lacking
//
private $host = DB_HOST; // these were brought in with the include above. File not shown.
private $user = DB_USER;
private $pass = DB_PASS;
private $dbname = DB_NAME;
private $dbh;
public $stmt; // was made public to get into rowCount(); .... change this for your needs
private $error;
public function __construct(){
// Set DSN
$dsn = 'mysql:host=' . $this->host . ';dbname=' . $this->dbname;
// Set options
$options = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_EMULATE_PREPARES => false
);
// Create a new PDO instanace
try{
$this->dbh = new PDO($dsn, $this->user, $this->pass, $options);
echo "Connect Ok<br>";
}
catch(PDOException $e){
$this->error = $e->getMessage();
}
}
public function bind($param, $value, $type = null) {
try {
if (is_null ( $type )) {
switch (true) {
case is_int ( $value ) :
$type = PDO::PARAM_INT;
break;
case is_bool ( $value ) :
$type = PDO::PARAM_BOOL;
break;
case is_null ( $value ) :
$type = PDO::PARAM_NULL;
break;
default :
$type = PDO::PARAM_STR;
}
}
$this->stmt->bindValue ( $param, $value, $type );
}
catch(PDOException $e){
$this->error = $e->getMessage();
throw $e;
}
}
public function query($query) {
try {
$this->stmt = $this->dbh->prepare($query);
}
catch(PDOException $e){
$this->error = $e->getMessage();
throw $e;
}
}
public function execute(){
try {
return $this->stmt->execute();
}
catch(PDOException $e){
$this->error = $e->getMessage();
throw $e;
}
}
}