TP数据层进行增删改查操作的代码

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Thinkphp数据层（模型层），添删改查操作超详细详解！下面一起来看看！

<?php   
namespace Home\Model;
use Think\Model;
class YmdModel extends Model{
	public function __construct(){
		$this->dbYimudi = M(&#39;yimudi&#39;);
		$this->dbYimudiUse = M(&#39;yimudi_use&#39;);
		$this->dbYimudiInfo = M(&#39;yimudi_info&#39;);
		$this->dbYimudiCi = M(&#39;yimudi_ci&#39;);
	}


	//两个表关联查询
	public function getYimudiOne($condition,$field){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiUse->table(&#39;yimudi_use yu,yimudi y&#39;)->where(&#39; yu.yimudi_id = y.yimudi_id&#39;.$condition)->field($field)->find();
		}
	}


	//统计一个表满足条件的数量
	public function getYimudiUseCount($condition){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiUse->where($condition)->count();
		}
	}



	//求和运算
	public function getEchangeYimudiCount($condition){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiUse->table(&#39;yimudi_use yu,yimudi y&#39;)->where(&#39; yu.yimudi_id = y.yimudi_id&#39;.$condition)->sum(&#39;change_num&#39;);
		}
	}


	//(yimud_id分组)
	public function getExchageByYimudiId($condition,$field){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiUse->table(&#39;yimudi_use yu,yimudi_ci yc&#39;)->where(&#39; yu.yimudi_id = yc.yimudi_id&#39;.$condition)->field($field)->group(&#39;yu.yimudi_id&#39;)->select();
		}
	}



	//更新操作
	public function updateYimudiUse($condition,$data){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiUse->where($condition)->save($data);
		}
	}


	//多表连接查询，分页获取数据
	public function getYimudiList($condition,$start,$size){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiUse->table(&#39;yimudi_use as yu&#39;)->join(&#39;yimudi  as  y  on  yu.yimudi_id = y.yimudi_id&#39;, &#39;left&#39;)->join(&#39;yimudi_cinema as yc  on yu.yimudi_id = yc.cinema_id&#39;, &#39;left&#39;)->where($condition)->field($field)->limit($start, $size)->select();
		}
	}


	//关联两个表满足的数据
	public function getYimudiCount($condition){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiUse->table(&#39;yimudi_use as yu&#39;)->join(&#39;yimudi  as  y  on  yu.yimudi_id = y.yimudi_id&#39;, &#39;left&#39;)->join(&#39;yimudi_ci as yc  on yu.yimudi_id = yc.yimudi_id&#39;, &#39;left&#39;)->where($condition)->count();
		}
	}


	//获取YIMUDI列表——ajax
	public function getYimudiListAjax($condition,$start,$size){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiUse->table(&#39;yimudi_use as yu&#39;)->join(&#39;yimudi  as  y  on  yu.yimudi_id = y.yimudi_id&#39;, &#39;left&#39;)->join(&#39;yimudi_ci as yc  on yu.yimudi_id = yc.yimudi_id&#39;, &#39;left&#39;)->where($condition)->field($field)->limit($start, $size)->select();
		}
	}


	//获取单条记录
	public function getYimudiCiDecription($condition,$file){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiCi->where($condition)->field($field)->find();
		}
	}


	//分页获取列表
	public function getCiYimudiList($condition,$start,$size){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiCiInfo->where($condition)->limit($start, $size)->select();
		}
	}



	//多表关联查询一条记录
	public function getCiYimudiById($condition){
		if (!$condition) {
			return false;
		}else{
			return $this->dbYimudiUse->table(&#39;yimudi_use as yu&#39;)->join(&#39;yimudi  as  y  on  yu.yimudi_id = y.yimudi_id&#39;, &#39;left&#39;)->join(&#39;yimudi_ci as yc  on yu.yimudi_id = yc.yimudi_id&#39;, &#39;left&#39;)->where($condition)->field($field)->find();
		}
	}
        
}

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