Table of Contents
thinkphp实现like模糊查询实例,thinkphp模糊查询
赵桐正讲的thinkphp中SQL模糊查询时%{$_POST['username']}%,为何有{}?
谁给我看看我用thinkphp的实现like查询数据库,怎不好使,什地方出错了
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thinkphp实现like模糊查询实例,thinkphp模糊查询

Jun 13, 2016 am 09:22 AM
thinkphp Inquire

thinkphp实现like模糊查询实例,thinkphp模糊查询

本文实例讲述了thinkphp实现like模糊查询的方法,分享给大家供大家参考。具体实现方法如下:

目前使用thinkphp框架进行项目开发的人越来越多了,由于其封装性较好,导致了很多纯PHP开发的部分不易上手,本文实例即以like模糊查询为例对此加以说明。

这里主要通过举例来说明用法:

ThinkPHP可以支持直接使用字符串作为查询条件,但是大多数情况推荐使用索引数组或者对象来作为查询条件,因为会更加安全。

一、使用字符串作为查询条件

这是最传统的方式,但是安全性不高,
例如:

复制代码 代码如下:

$User = M("User"); // 实例化User对象
$User->where('type=1 AND status=1')->select();


最后生成的SQL语句是

复制代码 代码如下:

SELECT * FROM think_user WHERE type=1 AND status=1

如果进行多字段查询,那么字段之间的默认逻辑关系是 逻辑与 AND,但是用下面的规则可以更改默认的逻辑判断,通过使用 _logic 定义查询逻辑:

复制代码 代码如下:

$User = M("User"); // 实例化User对象
$condition['name'] = 'thinkphp';
$condition['account'] = 'thinkphp';
$condition['_logic'] = 'OR';
// 把查询条件传入查询方法
$User->where($condition)->select();


最后生成的SQL语句是

复制代码 代码如下:

SELECT * FROM think_user WHERE `name`='thinkphp' OR `account`='thinkphp'

二、数组方式作为查询条件

讲了这么多了like查询怎么实现呢,下面看

复制代码 代码如下:

$userForm=M('user');
$where['name']=array('like','jb51%');
$userForm->where($where)->select();


这里的like查询即为:

复制代码 代码如下:

name like 'jb51%'

查询语句:

复制代码 代码如下:

$where['name']=array('like',array('%jb51%','%.com'),'OR');


这里的like查询即为:

复制代码 代码如下:

name like '%jb51%' or name like '%.com'

查询语句:

复制代码 代码如下:

$where['name']=array(array('like','%a%'),array('like','%b%'),array('like','%c%'),'jb51','or');


这里的like查询即为:

复制代码 代码如下:

(`name` LIKE '%a%') OR (`name` LIKE '%b%') OR (`name` LIKE '%c%') OR (`name` = 'jb51')

查询语句:

复制代码 代码如下:

$where['_string']='(name like "%jb51%")  OR (title like "%jb51")';


这里的like查询即为:

复制代码 代码如下:

name like '%jb51%' or title like '%jb51'

希望本文所述对大家的PHP程序设计有所帮助。

赵桐正讲的thinkphp中SQL模糊查询时%{$_POST['username']}%,为何有{}?

变量前后有字符的话,要加上 {} 来区分,不然系统会默认的将$ 后面所有的字符都当成变量的名字
 

谁给我看看我用thinkphp的实现like查询数据库,怎不好使,什地方出错了

public function serCon() { $search = $_GET['wd']; $where['title'] = array('like',"%$search%"); $db = M('ThemeCards')->where($where)->find(); print_r($db); }"%$search%"这里不能用单引号,单引号的话变量会被当成字符串,不能正确解析;
where条件中如楼下所说,需要整个$where变量;
p函数?这里返回值是数组类型,需要print_r,如果是自己封装的打印数组的函数的话这个可以忽略。

 

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