<?php
/**
 * mySqli數(shù)據(jù)庫操作類
 * 參數(shù)綁定防SQL注入
 * 作者：TANKING
 * 時(shí)間：2023-08-01
 **/
class Database
{
    private $host;
    private $username;
    private $password;
    private $database;
    private $conn;
    // 構(gòu)造方法
    public function __construct($host, $username, $password, $database)
    {
        $this->host = $host;
        $this->username = $username;
        $this->password = $password;
        $this->database = $database;
        $this->connect();
    }
    // 連接數(shù)據(jù)庫
    public function connect()
    {
        $this->conn = new mysqli($this->host, $this->username, $this->password, $this->database);
        if ($this->conn->connect_error) {
            die("連接數(shù)據(jù)庫失敗：" . $this->conn->connect_error);
        }
    }
    // 斷開數(shù)據(jù)庫連接
    public function disconnect()
    {
        $this->conn->close();
    }
    // Query方法
    public function query($sql, $params = [])
    {
        $stmt = $this->conn->prepare($sql);
        if ($stmt === false) {
            throw new Exception("預(yù)處理失?。? . $this->conn->error);
        }
        // 綁定參數(shù)
        if (!empty($params)) {
            $paramTypes = '';
            $bindParams = [];
            foreach ($params as $param) {
                if (is_int($param)) {
                    $paramTypes .= 'i'; // Integer
                } elseif (is_float($param)) {
                    $paramTypes .= 'd'; // Double
                } else {
                    $paramTypes .= 's'; // String
                }
                $bindParams[] = $param;
            }
            if (!empty($bindParams)) {
                $stmt->bind_param($paramTypes, ...$bindParams);
            }
        }
        $stmt->execute();
        $result = $stmt->get_result();
        if ($result === false) {
            throw new Exception("執(zhí)行查詢失敗：" . $stmt->error);
        }
        $data = [];
        while ($row = $result->fetch_assoc()) {
            $data[] = $row;
        }
        $stmt->close();
        return $data;
    }
    // 查詢一條數(shù)據(jù)
    public function selectOne($table, $conditions = [], $params = [], $fields = ['*'])
    {
        $limit = 1;
        $result = $this->select($table, $conditions, $params, $limit, $fields);
        if ($result && count($result) > 0) {
            return $result[0];
        }
        return null;
    }
    // 查詢所有數(shù)據(jù)
    public function selectAll($table, $conditions = [], $params = [], $fields = ['*'])
    {
        return $this->select($table, $conditions, $params, null, $fields);
    }
    // 高級查詢
    public function select($table, $conditions = [], $params = [], $fields = ['*'], $limit = '', $orderBy = '')
    {
        $fields = implode(', ', $fields);
        $whereClause = '';
        if (!empty($conditions)) {
            $whereClause = ' WHERE ' . implode(' AND ', $conditions);
        }
        $orderByClause = '';
        if (!empty($orderBy)) {
            $orderByClause = ' ORDER BY ' . $orderBy;
        }
        $limitClause = '';
        if (!empty($limit)) {
            $limitClause = ' LIMIT ' . $limit;
        }
        $sql = "SELECT $fields FROM $table $whereClause $orderByClause $limitClause";
        $stmt = $this->conn->prepare($sql);
        if ($stmt === false) {
            die("預(yù)處理查詢失?。? . $this->conn->error);
        }
        $types = '';
        $paramsToBind = [];
        foreach ($params as $param) {
            if (is_int($param)) {
                $types .= 'i'; // Integer
            } elseif (is_float($param)) {
                $types .= 'd'; // Double
            } else {
                $types .= 's'; // String
            }
            $paramsToBind[] = $param;
        }
        array_unshift($paramsToBind, $types);
        $bindResult = call_user_func_array([$stmt, 'bind_param'], $this->refValues($paramsToBind));
        if ($bindResult === false) {
            die("綁定參數(shù)失敗：" . $this->conn->error);
        }
        $stmt->execute();
        $result = $stmt->get_result();
        if ($result === false) {
            die("執(zhí)行查詢失?。? . $stmt->error);
        }
        $data = [];
        while ($row = $result->fetch_assoc()) {
            $data[] = $row;
        }
        $stmt->close();
        return $data;
    }
    // 插入數(shù)據(jù)
    public function insert($table, $data = [])
    {
        if (empty($data)) {
            die("插入數(shù)據(jù)失敗：數(shù)據(jù)為空");
        }
        $fields = implode(', ', array_keys($data));
        $placeholders = implode(', ', array_fill(0, count($data), '?'));
        $sql = "INSERT INTO $table ($fields) VALUES ($placeholders)";
        $params = array_values($data);
        $stmt = $this->conn->prepare($sql);
        if ($stmt === false) {
            die("預(yù)處理失?。? . $this->conn->error);
        }
        $types = '';
        $paramsToBind = [];
        foreach ($params as $param) {
            if (is_int($param)) {
                $types .= 'i'; // Integer
            } elseif (is_float($param)) {
                $types .= 'd'; // Double
            } else {
                $types .= 's'; // String
            }
            $paramsToBind[] = $param;
        }
        array_unshift($paramsToBind, $types);
        $bindResult = call_user_func_array([$stmt, 'bind_param'], $this->refValues($paramsToBind));
        if ($bindResult === false) {
            die("綁定參數(shù)失敗：" . $this->conn->error);
        }
        // 插入結(jié)果
        $result = $stmt->execute();
        // 斷開數(shù)據(jù)庫連接
        $stmt->close();
        // 返回結(jié)果
        return $result;
    }
    // 更新數(shù)據(jù)
    public function update($table, $data = [], $conditions = [], $params = [])
    {
        if (empty($data)) {
            die("更新數(shù)據(jù)失?。焊聰?shù)據(jù)為空");
        }
        $updateFields = implode(' = ?, ', array_keys($data)) . ' = ?';
        $whereClause = '';
        if (!empty($conditions)) {
            $whereClause = ' WHERE ' . implode(' AND ', $conditions);
        }
        $sql = "UPDATE $table SET $updateFields $whereClause";
        $updateParams = array_merge(array_values($data), $params);
        $stmt = $this->conn->prepare($sql);
        if ($stmt === false) {
            die("預(yù)處理失?。? . $this->conn->error);
        }
        $types = '';
        $paramsToBind = [];
        foreach ($updateParams as $param) {
            if (is_int($param)) {
                $types .= 'i'; // Integer
            } elseif (is_float($param)) {
                $types .= 'd'; // Double
            } else {
                $types .= 's'; // String
            }
            $paramsToBind[] = $param;
        }
        array_unshift($paramsToBind, $types);
        $bindResult = call_user_func_array([$stmt, 'bind_param'], $this->refValues($paramsToBind));
        if ($bindResult === false) {
            die("綁定參數(shù)失?。? . $this->conn->error);
        }
        $result = $stmt->execute();
        $stmt->close();
        return $result;
    }
    // 刪除數(shù)據(jù)
    public function delete($table, $conditions = [], $params = [])
    {
        if (empty($conditions)) {
            die("刪除數(shù)據(jù)失?。簞h除條件為空");
        }
        $whereClause = ' WHERE ' . implode(' AND ', $conditions);
        $sql = "DELETE FROM $table $whereClause";
        $stmt = $this->conn->prepare($sql);
        if ($stmt === false) {
            die("預(yù)處理查詢失?。? . $this->conn->error);
        }
        $types = '';
        $paramsToBind = [];
        foreach ($params as $param) {
            if (is_int($param)) {
                $types .= 'i'; // Integer
            } elseif (is_float($param)) {
                $types .= 'd'; // Double
            } else {
                $types .= 's'; // String
            }
            $paramsToBind[] = $param;
        }
        array_unshift($paramsToBind, $types);
        $bindResult = call_user_func_array([$stmt, 'bind_param'], $this->refValues($paramsToBind));
        if ($bindResult === false) {
            die("綁定參數(shù)失?。? . $this->conn->error);
        }
        $result = $stmt->execute();
        $stmt->close();
        return $result;
    }
    // 執(zhí)行原生語句
    public function querySQL($sql)
    {
        $result = $this->conn->query($sql);
        if ($result === false) {
            die("執(zhí)行原生失敗：" . $this->conn->error);
        }
        return $result;
    }
    // 數(shù)據(jù)綁定
    private function refValues($arr)
    {
        if (strnatcmp(phpversion(), '5.3') >= 0) // Reference is required for PHP 5.3+
        {
            $refs = array();
            foreach ($arr as $key => $value) {
                $refs[$key] = &$arr[$key];
            }
            return $refs;
        }
        return $arr;
    }
}
?>

<?php
// 數(shù)據(jù)庫配置文件
$config = array(
    'db_host' => 'xxx',
    'db_user' => 'xxx',
    'db_pass' => 'xxx',
    'db_name' => 'xxx'
);
// 數(shù)據(jù)庫操作類
include 'Database.php';
?>

<?php
// 引入配置文件
require_once 'Db.php';
// 實(shí)例化Database類并連接數(shù)據(jù)庫
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 插入數(shù)據(jù)
$insertParams = array(
    'stu_name' => '蔡徐坤',
    'stu_sex' => '男',
    'stu_from' => '廣州',
    'stu_grade' => '一年級',
    'stu_age' => 30,
);
// 執(zhí)行
$insertData = $db->insert('students', $insertParams);
// 執(zhí)行結(jié)果
if($insertData){
    echo '插入成功！'; 
}else{
    echo '插入失??！'.$insertData;
}
// 關(guān)閉連接
$db->disconnect();
?>

<?php
// 引入配置文件
require_once 'Db.php';
// 實(shí)例化Database類并連接數(shù)據(jù)庫
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 被更新的數(shù)據(jù)
$updateData = array(
    'stu_name' => '吳亦凡666',
    'stu_age' => 35
);
// 綁定參數(shù)
$updateCondition = array('id = ?');
$updateParams = array(1);
// 執(zhí)行
$updateResult = $db->update('students', $updateData, $updateCondition, $updateParams);
// 執(zhí)行結(jié)果
if($updateResult){
    echo '更新成功！'; 
}else{
    echo '更新失??！'.$updateResult;
}
// 關(guān)閉連接
$db->disconnect();
?>

<?php
// 引入配置文件
require_once 'Db.php';
// 實(shí)例化Database類并連接數(shù)據(jù)庫
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 綁定參數(shù)
$conditions = array('id = ?');
$params = array(2);
// 執(zhí)行
$deleteResult = $db->delete('students', $conditions, $params);
if ($deleteResult) {
    echo "刪除成功！";
} else {
    echo "刪除失敗。";
}
// 關(guān)閉連接
$db->disconnect();
?>

<?php
// 引入配置文件
require_once 'Db.php';
// 實(shí)例化Database類并連接數(shù)據(jù)庫
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 準(zhǔn)備查詢的條件和字段
$conditions = array('id = ?');
$params = array(1);
$fields = array('id', 'stu_name', 'stu_age', 'stu_from');
// 執(zhí)行
$selectedData = $db->selectOne('students', $conditions, $params, $fields);
// 執(zhí)行結(jié)果
if ($selectedData) {
    echo "查詢到一條數(shù)據(jù)：<br>";
    echo "ID: " . $selectedData['id'] . "<br>";
    echo "stu_name: " . $selectedData['stu_name'] . "<br>";
    echo "stu_age: " . $selectedData['stu_age'] . "<br>";
    echo "stu_from: " . $selectedData['stu_from'] . "<br>";
} else {
    echo "未查詢到數(shù)據(jù)。";
}
// 關(guān)閉連接
$db->disconnect();
?>

<?php
// 引入配置文件
require_once 'Db.php';
// 實(shí)例化Database類并連接數(shù)據(jù)庫
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 準(zhǔn)備查詢的條件和字段
$conditions = array('stu_sex = ?');
$params = array('男');
$fields = array('id', 'stu_name', 'stu_age', 'stu_from');
// 執(zhí)行
$selectedData = $db->selectAll('students', $conditions, $params, $fields);
// 執(zhí)行結(jié)果
if ($selectedData) {
    echo "查詢到的所有數(shù)據(jù)：<br>";
    foreach ($selectedData as $data) {
        echo "ID: " . $data['id'] . "<br>";
        echo "stu_name: " . $data['stu_name'] . "<br>";
        echo "stu_age: " . $data['stu_age'] . "<br>";
        echo "stu_from: " . $data['stu_from'] . "<br>";
        echo "<br>";
    }
} else {
    echo "未查詢到數(shù)據(jù)。";
}
// 關(guān)閉連接
$db->disconnect();
?>

<?php
// 引入配置文件
require_once 'Db.php';
// 實(shí)例化Database類并連接數(shù)據(jù)庫
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 準(zhǔn)備查詢的條件和字段
$conditions = array('stu_age > ?');
$params = array(25);
$fields = array('id', 'stu_name', 'stu_age', 'stu_from');
$limit = 3; // 查詢限制條數(shù)
$orderBy = 'id DESC'; // 排序方式
// 執(zhí)行
$selectedData = $db->select('students', $conditions, $params, $fields, $limit, $orderBy);
// 執(zhí)行結(jié)果
if ($selectedData) {
    echo "查詢到的數(shù)據(jù)：<br>";
    foreach ($selectedData as $data) {
        echo "ID: " . $data['id'] . "<br>";
        echo "stu_name: " . $data['stu_name'] . "<br>";
        echo "stu_age: " . $data['stu_age'] . "<br>";
        echo "stu_from: " . $data['stu_from'] . "<br>";
        echo "<br>";
    }
} else {
    echo "未查詢到數(shù)據(jù)。";
}
// 關(guān)閉連接
$db->disconnect();
?>

<?php
// 引入配置文件
require_once 'Db.php';
// 實(shí)例化Database類并連接數(shù)據(jù)庫
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 執(zhí)行
$sql = "SELECT * FROM students WHERE stu_age > 25";
$result = $db->querySQL($sql);
// 執(zhí)行結(jié)果
if ($result->num_rows > 0) {
    echo "查詢到的數(shù)據(jù)：<br>";
    while ($data = $result->fetch_assoc()) {
        echo "ID: " . $data['id'] . "<br>";
        echo "stu_name: " . $data['stu_name'] . "<br>";
        echo "stu_age: " . $data['stu_age'] . "<br>";
        echo "stu_from: " . $data['stu_from'] . "<br>";
        echo "<br>";
    }
} else {
    echo "未查詢到數(shù)據(jù)。";
}
// 關(guān)閉連接
$db->disconnect();
?>