php编写的mysqli增删改查数据库操作类示例
作者：TANKING
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类文件
这是一个php深度封装的MySQLi数据库操作类，支持插入、删除、查询和更新操作，并且使用数组进行参数传递，结合了预处理语句防止SQL注入。
Database.php
<?php
/**
* mySqli数据库操作类
* 参数绑定防SQL注入
* 作者：TANKING
* 时间：2023-08-01
**/
class Database
{
private $host;
private $username;
private $password;
private $database;
private $conn;
// 构造方法
public function __construct($host, $username, $password, $database)
{
$this->host = $host;
$this->username = $username;
$this->password = $password;
$this->database = $database;
$this->connect();
}
// 连接数据库
public function connect()
{
$this->conn = new mysqli($this->host, $this->username, $this->password, $this->database);
if ($this->conn->connect_error) {
die("连接数据库失败：" . $this->conn->connect_error);
}
}
// 断开数据库连接
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("预处理失败：" . $this->conn->error);
}
// 绑定参数
if (!empty($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("执行查询失败：" . $stmt->error);
}
$data = [];
while ($row = $result->fetch_assoc()) {
$data[] = $row;
}
$stmt->close();
return $data;
}
// 查询一条数据
public function selectOne($table, $conditions = [], $params = [], $fields = ['*'])
{
$limit = 1;
$result = $this->select($table, $conditions, $params, $limit, $fields);
if ($result && count($result) > 0) {
return $result[0];
}
return null;
}
// 查询所有数据
public function selectAll($table, $conditions = [], $params = [], $fields = ['*'])
{
return $this->select($table, $conditions, $params, null, $fields);
}
// 高级查询
public function select($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("预处理查询失败：" . $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("绑定参数失败：" . $this->conn->error);
}
$stmt->execute();
$result = $stmt->get_result();
if ($result === false) {
die("执行查询失败：" . $stmt->error);
}
$data = [];
while ($row = $result->fetch_assoc()) {
$data[] = $row;
}
$stmt->close();
return $data;
}
// 插入数据
public function insert($table, $data = [])
{
if (empty($data)) {
die("插入数据失败：数据为空");
}
$fields = implode(', ', array_keys($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("预处理失败：" . $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("绑定参数失败：" . $this->conn->error);
}
// 插入结果
$result = $stmt->execute();
// 断开数据库连接
$stmt->close();
// 返回结果
return $result;
}
// 更新数据
public function update($table, $data = [], $conditions = [], $params = [])
{
if (empty($data)) {
die("更新数据失败：更新数据为空");
}
$updateFields = implode(' = ?, ', array_keys($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("预处理失败：" . $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("绑定参数失败：" . $this->conn->error);
}
$result = $stmt->execute();
$stmt->close();
return $result;
}
// 删除数据
public function delete($table, $conditions = [], $params = [])
{
if (empty($conditions)) {
die("删除数据失败：删除条件为空");
}
$whereClause = ' WHERE ' . implode(' AND ', $conditions);
$sql = "DELETE FROM $table $whereClause";
$stmt = $this->conn->prepare($sql);
if ($stmt === false) {
die("预处理查询失败：" . $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("绑定参数失败：" . $this->conn->error);
}
$result = $stmt->execute();
$stmt->close();
return $result;
}
// 执行原生语句
public function querySQL($sql)
{
$result = $this->conn->query($sql);
if ($result === false) {
die("执行原生失败：" . $this->conn->error);
}
return $result;
}
// 数据绑定
private function refValues($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;
}
}
?>配置文件
Db.php
<?php
// 数据库配置文件
$config = array(
'db_host' => 'xxx',
'db_user' => 'xxx',
'db_pass' => 'xxx',
'db_name' => 'xxx'
);
// 数据库操作类
include 'Database.php';
?>使用示例
插入数据
insert.php
<?php
// 引入配置文件
require_once 'Db.php';
// 实例化Database类并连接数据库
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 插入数据
$insertParams = array(
'stu_name' => '蔡徐坤',
'stu_sex' => '男',
'stu_from' => '广州',
'stu_grade' => '一年级',
'stu_age' => 30,
);
// 执行
$insertData = $db->insert('students', $insertParams);
// 执行结果
if($insertData){
echo '插入成功！';
}else{
echo '插入失败！'.$insertData;
}
// 关闭连接
$db->disconnect();
?>更新数据
update.php
<?php
// 引入配置文件
require_once 'Db.php';
// 实例化Database类并连接数据库
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 被更新的数据
$updateData = array(
'stu_name' => '吴亦凡666',
'stu_age' => 35
);
// 绑定参数
$updateCondition = array('id = ?');
$updateParams = array(1);
// 执行
$updateResult = $db->update('students', $updateData, $updateCondition, $updateParams);
// 执行结果
if($updateResult){
echo '更新成功！';
}else{
echo '更新失败！'.$updateResult;
}
// 关闭连接
$db->disconnect();
?>删除数据
delete.php
<?php
// 引入配置文件
require_once 'Db.php';
// 实例化Database类并连接数据库
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 绑定参数
$conditions = array('id = ?');
$params = array(2);
// 执行
$deleteResult = $db->delete('students', $conditions, $params);
if ($deleteResult) {
echo "删除成功！";
} else {
echo "删除失败。";
}
// 关闭连接
$db->disconnect();
?>查询一条数据
selectOne.php
<?php
// 引入配置文件
require_once 'Db.php';
// 实例化Database类并连接数据库
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 准备查询的条件和字段
$conditions = array('id = ?');
$params = array(1);
$fields = array('id', 'stu_name', 'stu_age', 'stu_from');
// 执行
$selectedData = $db->selectOne('students', $conditions, $params, $fields);
// 执行结果
if ($selectedData) {
echo "查询到一条数据：<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 "未查询到数据。";
}
// 关闭连接
$db->disconnect();
?>查询所有数据
selectAll.php
<?php
// 引入配置文件
require_once 'Db.php';
// 实例化Database类并连接数据库
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 准备查询的条件和字段
$conditions = array('stu_sex = ?');
$params = array('男');
$fields = array('id', 'stu_name', 'stu_age', 'stu_from');
// 执行
$selectedData = $db->selectAll('students', $conditions, $params, $fields);
// 执行结果
if ($selectedData) {
echo "查询到的所有数据：<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 "未查询到数据。";
}
// 关闭连接
$db->disconnect();
?>高级查询
select.php
<?php
// 引入配置文件
require_once 'Db.php';
// 实例化Database类并连接数据库
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 准备查询的条件和字段
$conditions = array('stu_age > ?');
$params = array(25);
$fields = array('id', 'stu_name', 'stu_age', 'stu_from');
$limit = 3; // 查询限制条数
$orderBy = 'id DESC'; // 排序方式
// 执行
$selectedData = $db->select('students', $conditions, $params, $fields, $limit, $orderBy);
// 执行结果
if ($selectedData) {
echo "查询到的数据：<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 "未查询到数据。";
}
// 关闭连接
$db->disconnect();
?>执行原生语句
querySQL.php
<?php
// 引入配置文件
require_once 'Db.php';
// 实例化Database类并连接数据库
$db = new Database($config['db_host'], $config['db_user'], $config['db_pass'], $config['db_name']);
// 执行
$sql = "SELECT * FROM students WHERE stu_age > 25";
$result = $db->querySQL($sql);
// 执行结果
if ($result->num_rows > 0) {
echo "查询到的数据：<br>";
while ($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 "未查询到数据。";
}
// 关闭连接
$db->disconnect();
?>以上就是php编写的mysqli增删改查数据库操作类示例的详细内容，更多关于php mysqli增删改查的资料请关注脚本之家其它相关文章！