我使用prapared语句在SQLite3数据库中添加的数据无法使用WHERE进行搜索：
SELECT Active FROM Users WHERE Username="john"
我在PHP中进行了演示，使用准备好的和直接的语句添加数据，然后尝试搜索它们。
我的问题是两个：
这是PHP脚本。
<?php
error_reporting(E_ALL);
date_default_timezone_set('Europe/Helsinki');
ini_set('default_charset', 'UTF-8');
mb_internal_encoding("UTF-8");
header('Content-Type: text/html; charset=UTF-8');
$timezone = date('Z');
$db = '';
// ---
//
// adds a user in the db with a prepared statement
//
function add_user1($name, $pass)
{
global $timezone;
global $db;
$time = time();
try
{
$statement = "INSERT INTO Users (Username, Password, Time, Timezone, Active) VALUES (:Username,:Password,:Time,:Timezone,:Active);";
$query = $db->prepare($statement);
$query->bindValue(':Username', $name, SQLITE3_TEXT);
$query->bindValue(':Password', $pass, SQLITE3_TEXT);
$query->bindValue(':Time', $time, SQLITE3_INTEGER);
$query->bindValue(':Timezone', $timezone, SQLITE3_INTEGER);
$query->bindValue(':Active', '1', SQLITE3_INTEGER);
$ok = $query->execute();
}
catch(PDOException $exception)
{
echo $exception->getMessage();
}
}
//
// adds a user in the db with a direct execution
//
function add_user2($name, $pass)
{
global $timezone;
global $db;
$time = time();
try
{
$db->exec('INSERT INTO Users (Username, Password, Time, Timezone, Active) VALUES ("' . $name . '", "' . $pass . '", ' . $time . ', ' . $timezone . ', 1);');
}
catch(PDOException $exception)
{
echo $exception->getMessage();
}
}
//
// seeks a password for a given username
//
function seek($user)
{
global $timezone;
global $db;
try
{
// previous tests showed that this doesn't work on all cases
$result = $db->query('SELECT Password FROM Users WHERE Username="'. $user . '"');
foreach ($result as $row)
{
$password = $row['Password'];
echo "search through SQLite: password for $user is $password\n";
}
$result = $db->query("SELECT * FROM Users");
foreach($result as $row)
{
$username = $row['Username'];
$password = $row['Password'];
if ($username == $user)
{
echo " search through array: password for $username is $password";
break;
}
}
}
catch(PDOException $exception)
{
echo $exception->getMessage();
}
}
// ---
echo "<pre>\n";
try
{
$db = new PDO('sqlite::memory:');
$db->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
$db->exec("CREATE TABLE IF NOT EXISTS Users (Id INTEGER PRIMARY KEY, Username TEXT UNIQUE NOT NULL, Password TEXT NOT NULL, Time INTEGER UNIQUE NOT NULL, Timezone INTEGER NOT NULL, Active BOOLEAN NOT NULL);");
}
catch(PDOException $exception)
{
echo $exception->getMessage();
}
add_user1("Bob", "cat");
sleep(1);
add_user1("Mark", "dog");
sleep(1);
add_user2("John", "mouse");
sleep(1);
add_user2("Alice", "rodent");
try
{
$result = $db->query('SELECT * FROM Users');
foreach ($result as $row)
{
echo " Id: " . $row['Id'] . "\n";
echo "Username: " . $row['Username'] . "\n";
echo "Password: " . $row['Password'] . "\n";
echo " Time: " . $row['Time'] . "\n";
echo "Timezone: " . $row['Timezone'] . "\n";
echo " Active: " . $row['Active'] . "\n";
echo "\n";
}
}
catch(PDOException $exception)
{
echo $exception->getMessage();
}
seek("Alice");
echo "\n\n";
seek("Mark");
$db = NULL;
?>
答案 0 :(得分：1)
有人告诉我，我应该删除绑定上的类型。我做了，它的工作原理:)）
感谢所有阅读它的人。
以下是完整的工作示例。
<?php
error_reporting(E_ALL);
date_default_timezone_set('Europe/Helsinki');
ini_set('default_charset', 'UTF-8');
mb_internal_encoding("UTF-8");
header('Content-Type: text/html; charset=UTF-8');
$timezone = date('Z');
$db = '';
// ---
//
// adds a user in the db with a prepared statement
//
function add_user1($name, $pass)
{
global $timezone;
global $db;
$time = time();
try
{
$statement = "INSERT INTO Users (Username, Password, Time, Timezone, Active) VALUES (:Username,:Password,:Time,:Timezone,:Active);";
$query = $db->prepare($statement);
$query->bindValue(':Username', $name);
$query->bindValue(':Password', $pass);
$query->bindValue(':Time', $time);
$query->bindValue(':Timezone', $timezone);
$query->bindValue(':Active', '1');
$ok = $query->execute();
}
catch(PDOException $exception)
{
echo $exception->getMessage();
}
}
//
// adds a user in the db with a direct execution
//
function add_user2($name, $pass)
{
global $timezone;
global $db;
$time = time();
try
{
$db->exec('INSERT INTO Users (Username, Password, Time, Timezone, Active) VALUES ("' . $name . '", "' . $pass . '", ' . $time . ', ' . $timezone . ', 1);');
}
catch(PDOException $exception)
{
echo $exception->getMessage();
}
}
//
// seeks a password for a given username
//
function seek($user)
{
global $timezone;
global $db;
try
{
// previous tests showed that this doesn't work on all cases
$result = $db->query('SELECT Password FROM Users WHERE Username="'. $user . '"');
foreach ($result as $row)
{
$password = $row['Password'];
echo "search through SQLite: password for $user is $password\n";
}
$result = $db->query("SELECT * FROM Users");
foreach($result as $row)
{
$username = $row['Username'];
$password = $row['Password'];
if ($username == $user)
{
echo " search through array: password for $username is $password";
break;
}
}
}
catch(PDOException $exception)
{
echo $exception->getMessage();
}
}
// ---
echo "<pre>\n";
try
{
$db = new PDO('sqlite::memory:');
$db->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
$db->exec("CREATE TABLE IF NOT EXISTS Users (Id INTEGER PRIMARY KEY, Username TEXT UNIQUE NOT NULL, Password TEXT NOT NULL, Time INTEGER UNIQUE NOT NULL, Timezone INTEGER NOT NULL, Active BOOLEAN NOT NULL);");
}
catch(PDOException $exception)
{
echo $exception->getMessage();
}
add_user1("Bob", "cat");
sleep(1);
add_user1("Mark", "dog");
sleep(1);
add_user2("John", "mouse");
sleep(1);
add_user2("Alice", "rodent");
try
{
$result = $db->query('SELECT * FROM Users');
foreach ($result as $row)
{
echo " Id: " . $row['Id'] . "\n";
echo "Username: " . $row['Username'] . "\n";
echo "Password: " . $row['Password'] . "\n";
echo " Time: " . $row['Time'] . "\n";
echo "Timezone: " . $row['Timezone'] . "\n";
echo " Active: " . $row['Active'] . "\n";
echo "\n";
}
}
catch(PDOException $exception)
{
echo $exception->getMessage();
}
seek("Alice");
echo "\n\n";
seek("Mark");
$db = NULL;
?>