PHP connection database class based on MySQLI function-PHP Tutorial-php.cn

PHP connection database class based on MySQLI function

巴扎黑

Release： 2023-03-14 22:02:02

Original

1787 people have browsed it

This article mainly introduces the database connection tool class encapsulated by PHP based on the MySQLI function. It analyzes the database operation class definition and basic operation usage such as connection, addition, deletion, modification and query of the database implemented by the PHP encapsulation mysqli function in the form of examples. Friends in need. You can refer to the following

The example of this article describes the database connection tool class encapsulated by PHP based on the MySQLI function. Share it with everyone for your reference, the details are as follows:

mysql.class.php：

mysqli = new mysqli($host, $username, $password, $database, $port);
  }
  /**
   * 数据查询
   * @param $table 数据表
   * @param null $field 字段
   * @param null $where 条件
   * @return mixed 查询结果数目
   */
  public function select($table, $field = null, $where = null)
  {
    $sql = "SELECT * FROM {$table}";
    if (!empty($field)) {
      $field = '`' . implode('`,`', $field) . '`';
      $sql = str_replace('*', $field, $sql);
    }
    if (!empty($where)) {
      $sql = $sql . ' WHERE ' . $where;
    }
    $this->result = $this->mysqli->query($sql);
    return $this->result->num_rows;
  }
  /**
   * @return mixed 获取全部结果
   */
  public function fetchAll()
  {
    return $this->result->fetch_all(MYSQLI_ASSOC);
  }
  /**
   * 插入数据
   * @param $table 数据表
   * @param $data 数据数组
   * @return mixed 插入ID
   */
  public function insert($table, $data)
  {
    foreach ($data as $key => $value) {
      $data[$key] = $this->mysqli->real_escape_string($value);
    }
    $keys = '`' . implode('`,`', array_keys($data)) . '`';
    $values = '\'' . implode("','", array_values($data)) . '\'';
    $sql = "INSERT INTO {$table}( {$keys} )VALUES( {$values} )";
    $this->mysqli->query($sql);
    return $this->mysqli->insert_id;
  }
  /**
   * 更新数据
   * @param $table 数据表
   * @param $data 数据数组
   * @param $where 过滤条件
   * @return mixed 受影响记录
   */
  public function update($table, $data, $where)
  {
    foreach ($data as $key => $value) {
      $data[$key] = $this->mysqli->real_escape_string($value);
    }
    $sets = array();
    foreach ($data as $key => $value) {
      $kstr = '`' . $key . '`';
      $vstr = '\'' . $value . '\'';
      array_push($sets, $kstr . '=' . $vstr);
    }
    $kav = implode(',', $sets);
    $sql = "UPDATE {$table} SET {$kav} WHERE {$where}";
    $this->mysqli->query($sql);
    return $this->mysqli->affected_rows;
  }
  /**
   * 删除数据
   * @param $table 数据表
   * @param $where 过滤条件
   * @return mixed 受影响记录
   */
  public function delete($table, $where)
  {
    $sql = "DELETE FROM {$table} WHERE {$where}";
    $this->mysqli->query($sql);
    return $this->mysqli->affected_rows;
  }
}

Copy after login

How to use

 'mysql',
  'host' => 'localhost',
  'username' => 'woider',
  'password' => '3243',
  'database' => 'php',
  'port' => '3306'
);
/* 连接数据库 */
$mysql = new mysql();
$mysql->connect($config);
/* 查询数据 */
//1、查询所有数据
$table = 'mysqli';//数据表
$num = $mysql->select($table);
echo '共查询到' . $num . '条数据';
print_r($mysql->fetchAll());
//2、查询部分数据
$field = array('username', 'password'); //过滤字段
$where = 'id % 2 =0';          //过滤条件
$mysql->select($table, $field, $where);
print_r($mysql->fetchAll());
/* 插入数据 */
$table = 'mysqli';//数据表
$data = array(  //数据数组
  'username' => 'admin',
  'password' => sha1('admin')
);
$id = $mysql->insert($table, $data);
echo '插入记录的ID为' . $id;
/* 修改数据 */
$table = 'mysqli';//数据表
$data = array(
  'password' => sha1('nimda')
);
$where = 'id = 44';
$rows = $mysql->update($table, $data, $where);
echo '受影响的记录数量为' . $rows . '条';
/* 删除数据 */
$table = 'mysqli';
$where = 'id = 45';
$rows = $mysql->delete($table, $where);
echo '已删除' . $rows . '条数据';

Copy after login

The above is the detailed content of PHP connection database class based on MySQLI function. For more information, please follow other related articles on the PHP Chinese website!