<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Db_model extends CI_Model {


    public function __construct()
    {
		parent::__construct();
		$this->load->database();
    }

	/*
		读取所有信息
		$table:表名
	*/
	public function getData($table,$recommend,$order,$offset,$len)
	{
		$query = $this->db->query("SELECT * FROM ".$table." ORDER BY ".$recommend." ".$order." LIMIT ".$offset.",".$len);
		$data = $query->result();
		return $data;
	}

	/*
		读取所有信息
		$table:表名
	*/
	public function getAllData($table)
	{
		$query = $this->db->query("SELECT * FROM ".$table);
		$data = $query->result();
		return $data;
	}

	/*
		按条件读取所有信息
		$table:表名
		$where:条件数组
	*/
	public function getSpecificData($table,$where)
	{
		$this->db->where($where);
		$query = $this->db->get($table);
		$data = $query->result();
		return $data;
	}

	/*
		插入信息
		$table:表名
		$data:数组
		$data = array(
			array(
			'title' => 'My title' ,
			'name' => 'My Name' ,
			'date' => 'My date'
			),
			array(
			'title' => 'My title1' ,
			'name' => 'My Name1' ,
			'date' => 'My date1'
			)
		);
	*/
	public function insertData($table,$data)
	{
		$this->db->insert($table, $data);
	}

	/*
		修改
		$table:表名
		$data:数据数组
		$where:条件数组

		$data = array(
               'title' => $title,
               'name' => $name,
               'date' => $date
            );
	*/
	public function updateData($table,$data,$where)
	{
		$this->db->where($where);
		$this->db->update($table,$data);
	}

	/*
		获得表总行数
		$table:表名
	*/
	public function getTotalRows($table)
	{
		$total_rows = $this->db->count_all($table); 
		return $total_rows;
	}

	/*
		获得结果集
		$table:表名
	*/
	public function getPage($table,$where,$like,$current)
	{
		$num = $this->Config_model->getPageNum();
		
		$data = array();
		$msg = $this->getSearchData($table,$where,$like,null,null,null,null);
		$totalRows = count($msg);
		$totalPage = ceil($totalRows / $num);
		$data[0] = $totalRows;
		$data[1] = $totalPage;
		$data[2] = $current;
		return $data;
	}

	/*
		搜索
		$table:表名
		$where:搜索字段数组
		$where = array('字段' => 数值);
		$like:模糊搜索字段数组
		//$like = array('title' => $match, 'page1' => $match, 'page2' => $match);
		$recommend:排序字段
		$order:排序
		$offset:偏移量
		$len:数据数量
	*/
	public function getSearchData($table,$where,$like,$recommend,$order,$offset,$len)
	{
		//$this->db->get($table);
		if ($where != null)
			$this->db->where($where);
		if ($like != null)
			$this->db->like($like);
		if ($recommend != null)
			$this->db->order_by($recommend,$order);
		if ($len != null)
			$this->db->limit($len,$offset);
		$query = $this->db->get($table);
		$data = $query->result();
		return $data;
	}

	/*
		删除
		$table:表名
		$where :条件数组
	*/
	public function delData($table,$where)
	{
		$this->db->where($where); 
		$this->db->delete($table);
	}

}