PHP实战：CI框架(CodeIgniter)公共模型类定义与用法示例

<?php
/**
 * Created by PhpStorm.
 * User: kangjianrong
 * Date: 16-8-26
 * Time: 上午10:29
 */
class My_model extends CI_Model {
  //数据库
  public $errors = array();
  const dataBase = 'qndnew';
  public function __construct()
  {
    // Call the CI_Model constructor
    parent::__construct();
  }
  /**
   * 查询分页数据(使用于简单的单表操作)
   * @param string $model 模型     例如：User_model
   * @param string $table 表名
   * @param string $select_fields 要显示字段
   * @param array $param 查询条件：
   *   compare(比较):
   *     array($key => $val) $key为要操作的字段,$val为要操作的值
   *     array('name !=' => $name, 'id <' => $id, 'date >' => $date);
   *   like(模糊查询)
   *     array('title' => $match, 'page1' => $match, 'page2' => $match)
   *   customStr(自定义字符串):
   *     "name='Joe' AND status='boss' OR status='active'"
   *   in:
   *     array('userName' => array('Frank', 'Todd', 'James'))
   * @param string $page 当前页数(查询全部数据时,设置为空)
   * @param string $limit 查询条数(查询全部数据时,设置为空)
   * @param array $order 排序条件：
   *   array($key => $val)
   *   $key为排序依据的字段,
   *   $val为排序的方式【asc (升序,默认)或 desc(降序), 或 random(随机)】
   * @$isReturnCount boole    是否返回总条数
   * @return array|boolean
   *
   */
  public function pageData($model, $table, $param = array(),$select_fields = '', $page = '1', $limit = '15', $order = array(),$isReturnCount = true){
    if(empty($model) || empty($table)){
      return false;
    }
    $this -> load -> model($model);
    $table = $this->db->dbprefix.$table;
    //处理查询字段
    if(!empty($select_fields)){
      $this->db->select($select_fields)->from($table);
    }elseif(isset($this -> $model -> selectFields)){
      $this->db->select($this -> $model -> selectFields)->from($table);
    }else{
      $this->db->select('*')->from($table);
    }
    //处理查询条件
    if (is_array($param) && count($param) > 0){
      $this -> parseParam($param);
    }
    //统计总数
    if($isReturnCount){
      $rs['count']  = $this->db->count_all_results('',false);//不重置查询构造器
      array_push($this -> errors,$this->db->last_query());
    }
    //分页数据处理
    if(isset($page) && isset($param['limit'])){
      //分页边界值 设置
      $offset = $param['page'] <= 1 ? 0 : ($param['page']-1) * $param['limit'];
      $this->db->limit($param['limit'], $offset);
    }
    //排序规则的组合
    if (!empty($order) && is_array($order))
    {
      foreach ($order as $key => $val)
      {
        $this->db->order_by($key, $val);
      }
    }else{
      //默认按照此表的主键倒序
      $primary = $this->getPrimary();
      if(!empty($primary))
      {
        $this->db->order_by($primary, 'DESC');
      }
    }
    $query = $this->db->get();
    array_push($this -> errors,$this->db->last_query());
    $rs['list'] = $query->result_array();
    return $rs;
  }
  /**
   * 解析参数
   */
  private function parseParam($param){
    if(isset($param['compare'])){
      foreach ($param['compare'] as $key => $val){
        if (!empty($val)) $this->db->where($key, $val);
      }
    }
    if(isset($param['like'])){
      foreach ($param['like'] as $key => $val){
        if (!empty($val)) $this->db->like($key, $val);
      }
    }
    if(isset($param['in'])){
      foreach ($param['in'] as $key => $val){
        if (!empty($val)) $this->db->where_in($key, $val);
      }
    }
    if(isset($param['customStr'])){
      if (!empty($val)) $this->db->where($param['customStr']);
    }
  }
  /**
   * 新增信息
   * @param string $table 表名称
   * @param array $param 数据变量
   * @return INT ID
   */
  public function add($table = '', $param = array())
  {
    if(empty($table) || !is_array($param) || empty ($param)){
      return FALSE;
    }
    //写入数据表
    $this->db->insert($table, $param);
      array_push($this -> errors,$this->db->last_query());
    //返回记录ID
    return $this->db->insert_id();
  }
  /**
   * 更新分类信息
   * @param string  $table   表名称
   * @param string  $primary  表主键
   * @param int    $id     分类ID
   * @param array   $param   更新的数据
   * @return type
   */
  public function update($table = '', $primary = '', $id = 0, $param = array())
  {
    if(empty($table) || empty($primary) || empty($param) || empty($id))
    {
      return FALSE;
    }
    $id = (int)$id;
    $this->db->where($primary, $id)
         ->limit(1)
         ->update($table, $param);
    array_push($this -> errors,$this->db->last_query());
    return $this->db->affected_rows();
  }
  /**
   * 删除指定ID记录
   * @param string  $table   表名称
   * @param string  $primary  表主键
   * @param array   $id     分类ID
   * @return int
   */
  public function delete($table = '', $primary = '', $id = array()){
    if(empty($table) || empty($primary) || empty($id)){
      return FALSE;
    }
    $this->db->where_in($primary, $id)
        ->delete($table);
    array_push($this -> errors,$this->db->last_query());
    return $this->db->affected_rows();
  }
  /**
   * 获取表的主键
   * @param string  $database  数据库名称
   * @param strting  $table   表名称
   */
  public function getPrimary($table = '', $database = self::dataBase)
  {
    if(empty($database) || empty($table))
    {
      return FALSE;
    }
    $sql = "SELECT k.column_name
        FROM information_schema.table_constraints t
        JOIN information_schema.key_column_usage k
        USING (constraint_name,table_schema,table_name)
        WHERE t.constraint_type='PRIMARY KEY'
         AND t.table_schema='qndnew'
         AND t.table_name='qnd_user'";
    $query = $this->db->query($sql)->result_array();
    return isset($query[0]['column_name']) ? $query[0]['column_name'] : false;
  }
  /**
   * debug sql语句
   */
  public function debugSql(){
    if(count($this->errors) > 0){
      foreach($this->errors as $val){
        echo $val.'<br>';
      }
    }
  }
}

class User_model extends My_model {
  const USER = 'qnd_user';
  public $selectFields = array(
    'id',
    'guid',
    'phone',
    'userName',
    'password',
    'headPortraits',
    'nickName',
    'createTime',
  );
  const SMS_ROLE = 'qnd_role';
  public function __construct()
  {
  }
}

public function modelTest(){
    $this -> load -> model('User_model'); // d入 model
    $whereArr = array(
            'compare'=>array(
              'userName' => 'Frank',
            ),
          );
    $rs = $this -> User_model -> pageData('User_model','user',$whereArr);
    print_r($rs);
    $this -> User_model -> debugSql();
  }