PHP simple database operation class example

The examples in this article describe PHP simple database operation classes. Share it with everyone for your reference, the details are as follows:

When developing a project, the database is indispensable. But many times, I feel a headache due to the complexity of database SQL statements. Provide a database operation class (Model) that I use myself for everyone to use. It supports addition, deletion, modification, and query, and supports chain operations. The code is less than 100 lines. It is very compact and convenient, and is very suitable for rapid deployment of small projects.

/**
*
* @Authot: summer
*
* @E-mail: wenghang1228@me.com
*
* @Data: 2015-02-06
*
* @Project: 数据库操作类Model
*
* @Version:1.0
*
* @版权所有：夏天的风————记录夏天对技术的追求与生活的热爱
*
* @网址: http://www.xtwind.com
**/
class Model{
  public $field;
  public $tabname;
  public $where;
  public $order;
  public $limit;
  //构造函数，链接数据库，给表赋值
  function __construct($tabname){
    mysql_connect(HOST,USER,PASSWORD);
    mysql_select_db(DBNAME);
    mysql_query("set names utf8");
    $this->tabname=$tabname;
  }
  //组合字段
  function field($field){
    $this->$field=$field;
    return $this;
  }
  //组合where条件
  function where($where){
    $this->where="where ".$where;
    return $this;
  }
  //组合order排序条件
  function order($order){
    $this->order="order by ".$order;
    return $this;
  }
  //组合limit限制条数
  function limit($limit){
    $this->limit="limit ".$limit;
    return $this;
  }
  //组合和执行select语句
  function select($all=""){
    if ($all) {
      $sql="select {$all} from {$this->tabname} order by id";
    }else{
      $sql="select {$this->filed} from {$this->tabname} {$this->where} {$this->order} {$this->limit}";
    }
    $rst=mysql_query($sql);
    while ($row=mysql_fetch_assoc($rst)) {
      $rows[]=$row;
    }
    return $rows;
  }
  //组合和执行insert语句
  function insert($post){ //数据库插入操作,接收数组
    foreach ($post as $key => $value) {
      $keys[]=$key;
      $vals[]="'".$valu."'";
    }
    $keyStr=join(",",$keys);
    $valStr=join(",",$vals);
    $sql="insert into {$this->tabname}($keystr) values()";
    if (mysql_query($sql)) {
      return mysql_insert_id();
    }else{
      return false;
    }
  }
  //组合和执行delect语句
  function delect(){
    $sql="delect from {$this->tabname} {$this->where}";
    if (mysql_query($sql)) {
      return mysql_affected_rows();
    }else{
      return false;
    }
  }
  //组合和执行updata语句
  function update($post){
    foreach ($psot as $key => $value) {
      $sets[]="{$key}='{$val}'";
    }
    $setStr=join(",",$sets);
    $sql="update {$this->tabname} set {$setStr} {$this->where} ";
    if (mysql_query($sql)) {
      return mysql_affected_rows();
    }else{
      return false;
    }
  }
  //从表中取一行数据
  function find(){ 
    if ($this->order) {
      $sql="select * from {$this->tabname} {$this->order} limit 1";
    }else{
      $sql="select * from {$this->tabname} order by id limit 1";
    }
    $rst=mysql_query($sql);
    while ($row=mysql_fetch_assoc($rst)) {
      $rows[]=$row;
    }
    return $rows;
  }
  //获取总行数
  function total(){ 
    $sql="select count(*) from {$this->tabname}";
    $rst=mysql_query($sql);
    if ($rst) {
      $row=mysql_fetch_row($rst);
      return $row[0];
    }else{
      return false;
    }
  }
}
//Model类对象工厂
function M($tabname){
  return new Model($tabname);
}
define("HOST","localhost");
define("USER", "root");
define("PASSWORD", "123456");
define("DBNAME", "test")
$user=new Model("user");
$user->field("id,name")->where("id=3")->order("id desc")->limit("3")->select();

I hope this article will be helpful to everyone in PHP programming.

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