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Homephp教程php手册ThinkPHP查询语句与关联查询用法实例

这篇文章主要介绍了ThinkPHP查询语句与关联查询用法,以实例的形式常见的查询方法,包括数组作为查询条件及对象方式来查询等技巧,需要的朋友可以参考下

本文实例讲述了ThinkPHP查询语句与关联查询用法。分享给大家供大家参考。具体如下:

在thinkphp框架页面中我们可以直接拼写sql查询语句来实现数据库查询读写操作,下面就对此加以实例说明。

普通查询除了字符串查询条件外,数组和对象方式的查询条件是非常常用的,这些是基本查询所必须掌握的。

一、使用数组作为查询条件

复制代码 代码如下:

$User = M("User"); //实例化User对象

$condition['name'] = 'thinkphp'; // 把查询条件传入查询方法
$User->where($condition)->select();


二、使用对象方式来查询 可以使用任何对象 这里以stdClass内置对象为例

复制代码 代码如下:

$User = M("User"); // 实例化User对象
// 定义查询条件 $condition = new stdClass();
$condition->name = 'thinkphp';  // 查询name的值为thinkphp的记录
$User->where($condition)->select(); //  上面的查询条件等同于 where('name="thinkphp"') 使用对象方式查询和使用数组查询的效果是相同的,并且是可

带where条件的普通查询
  
1、字符串形式

复制代码 代码如下:

$user=M('user');
$list=$user->where('id>5 and idselect();
$list=$user->where($data)->select();


2、数组形式

复制代码 代码如下:

$user=M('user');
$list=$user->where(array('username'=>'www.jb51.net'))->select();
$list=$user->where($data)->select();


3、对象形式

复制代码 代码如下:

$user=M('user');
$a=new stdClass();
$a->username='www.jb51.net;
$list=$user->where($a)->select();


两个表的关联查询:

复制代码 代码如下:

$M_shopping = M('Shops');
$M_product = M('Product');
$list_shops = $M_shopping->join('as shops left join hr_product as product on shops.product_id = product.p_id')
->field('product.p_id,product.p_name,shops.product_amount,shops.product_id')
->where("shops.user_cookie='".$_COOKIE['hr_think_userid']."'")
->group('shops.id')
->select();

区间查询

复制代码 代码如下:

$user=M('user');
$data['id']=array(array('gt',20),array('lt',23),'and');
$list=$user->where($data)->select();


组合查询

复制代码 代码如下:

$user=M('user');
$data['username']='pengyanjie';
$data['password']=array('eq','pengyanjie');
$data['id']=array('lt',30);
$data['_logic']='or';
$list=$user->where($data)->select();
dump($list);


复合查询

复制代码 代码如下:

$user=M('user');
$data['username']=array('eq','pengyanjie');
$data['password']=array('like','p%');
$data['_logic']='or';
$where['_complex']=$where;
$where['id']=array('lt',30);
$list=$user->where($data)->select();


三个数据表的关联查询

复制代码 代码如下:

$M_shopping = M('Shops');
$M_product = M('Product');
$M_proimg = M('Product_image');
$list_shops = $M_shopping->join('as shops left join hr_product as product on shops.product_id = product.p_id left join
hr_product_image as productimgon productimg.p_id = product.p_id')->fiel('productimg.pi_url,product.p_id,product.p_name,shops.product_amount,shops.product_id,product.am_id,
product.p_procolor,product.p_price,product_amount*p_price as totalone')->where("shops.user_cookie='".$_COOKIE['hr_think_userid']."'")
->group('shops.id')->select();


数据表的查询条件

① 下面的是直接吧查询的条件放到了where中,,这样就方便了条件的书写

复制代码 代码如下:

$m_test = M("Product");
$productmeaage = $m_test->where("p_id='$proid'")->select();

② 除了上面的方法还有一种是以数组的方式

复制代码 代码如下:

$M_product = M('Product');
$map['pid'] = $proid;
$p_result = $M_product->where($map)->select();

希望本文所述对大家的ThinkPHP框架程序设计有所帮助。

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