Home Backend Development PHP Tutorial 一段查询代码多处使用可以吗解决办法

一段查询代码多处使用可以吗解决办法

Jun 13, 2016 am 11:51 AM
gt nbsp sql this

一段查询代码多处使用可以吗

<br />$bliang='这是个变量'<br />$sql=SELECT * FROM A表 WHERE cart LIKE '%.$bliang.%'<br />$query=mysql_query($sql);<br />while($row=mysql_fetch_array($query)){<br /> <br />  …………<br />}
Copy after login


上边是查询代码   然后我使用它时  只需要这样  比如 $row[$bliang='分类2']   这样就可以分类2下的内容 

$row[$bliang='分类3'] 就显示分类3下的内容

这样的需求  要怎么样实现呢

------解决方案--------------------
写成函数啊,我也是刚学php,我给你一个我自己做的类参考下吧,所有数据库操作都在这里了

<br><?php <br />// <br><font color="#FF8000">------解决方案--------------------</font><br> PHP version 5.3<br>// 数据库操作类 Order by phuai007 <br>// Date 2014/2<br>class my_sql {<br>  public $dsn = 'mysql:host=localhost;dbname=lif2';//host为数据库连接地址,dbname为数据库名<br>  public $user = 'root';                           //数据库连接用户名<br>  public $pass = '123456';                         //对应的密码<br>  public $names = 'SET NAMES UTF8';                //数据库查询编码<br>  //查询数据库返回结果<br>  public function sql_select($sql) {<br>	  try {<br>		  $dbh = new PDO($this->dsn, $this->user, $this->pass);<br>		  $dbh->query($this->names);<br>		  return $dbh->query($sql);<br>		  $dbh = null;<br>	  }<br>	  catch(Exception $e) {<br>		  echo 'error: ' . $e->getMessage();<br>	  }<br>  }<br>  //操作单条数据(更新/删除/插入),无返回结果<br>  public function sql_one($sql) {<br>	  try {<br>		  $dbh = new PDO($this->dsn, $this->user, $this->pass);<br>		  $dbh->exec($this->names);<br>		  $dbh->exec($sql);<br>		  $dbh = null;<br>	  }<br>	  catch(Exception $e) {<br>		  echo 'error: ' . $e->getMessage();<br>	  }<br>  }<br>  //操作多条数据(更新/删除),无返回结果<br>  public function sql_more($sql, $str) {<br>	  try {<br>		  $dbh = new PDO($this->dsn, $this->user, $this->pass);<br>		  $dbh->exec($this->names);<br>		  foreach ($str as $arrs) {<br>			  $dbh->exec($sql . $arrs);<br>		  }<br>		  $dbh = null;<br>	  }<br>	  catch(Exception $e) {<br>		  echo 'error: ' . $e->getMessage();<br>	  }<br>  }<br>  <br>  //参数化查询数据库返回结果(单条)<br>  public function cs_sql_select($sql,$str) {<br>	  try {<br>		  $dbh = new PDO($this->dsn, $this->user, $this->pass);<br>		  $dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);<br>		  $dbh->query($this->names);<br>		  $stmt = $dbh->prepare($sql);<br>		  $stmt->bindValue(":key", $str ,PDO::PARAM_INT);<br>		  $stmt->execute();<br>		  return $stmt;<br>		  $dbh = null;<br>	  }<br>	  catch(Exception $e) {<br>		  echo 'error: ' . $e->getMessage();<br>	  }<br>  }  <br>  //参数化查询操作多条数据(删除/更新),无返回结果<br>  public function cs_sql_more($sql, $str) {<br>	  try {<br>		  $dbh = new PDO($this->dsn, $this->user, $this->pass);<br>		  $dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);<br>		  $dbh->exec($this->names);<br>		  foreach ($str as $arrs) {<br>			  $stmt = $dbh->prepare($sql);<br>			  $stmt->bindValue(":key", $arrs,PDO::PARAM_INT);<br>			  $stmt->execute();<br>		  }<br>		  $dbh = null;<br>	  }<br>	  catch(Exception $e) {<br>		  echo 'error: ' . $e->getMessage();<br>	  }<br>  }<br>  //参数化查询操作单条数据(删除/更新),无返回结果<br>  public function cs_sql_one($sql, $str) {<br>	  try {<br>		  $dbh = new PDO($this->dsn, $this->user, $this->pass);<br>		  $dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);<br>		  $dbh->exec($this->names);<br>		  $stmt = $dbh->prepare($sql);<br>		  $stmt->bindValue(":key", $str,PDO::PARAM_INT);<br>		  $stmt->execute();<br>		  $dbh = null;<br>	  }<br>	  catch(Exception $e) {<br>		  echo 'error: ' . $e->getMessage();<br>	  }<br>  }<br>  <br>  <br>  ////////<br>}<br>?><div class="clear">
                 
              
              
        
            </div>
Copy after login
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Java Tutorial
1664
14
PHP Tutorial
1266
29
C# Tutorial
1239
24
What is the difference between HQL and SQL in Hibernate framework? What is the difference between HQL and SQL in Hibernate framework? Apr 17, 2024 pm 02:57 PM

HQL and SQL are compared in the Hibernate framework: HQL (1. Object-oriented syntax, 2. Database-independent queries, 3. Type safety), while SQL directly operates the database (1. Database-independent standards, 2. Complex executable queries and data manipulation).

10 Ways to Adjust Brightness on Windows 11 10 Ways to Adjust Brightness on Windows 11 Dec 18, 2023 pm 02:21 PM

Screen brightness is an integral part of using modern computing devices, especially when you look at the screen for long periods of time. It helps you reduce eye strain, improve legibility, and view content easily and efficiently. However, depending on your settings, it can sometimes be difficult to manage brightness, especially on Windows 11 with the new UI changes. If you're having trouble adjusting brightness, here are all the ways to manage brightness on Windows 11. How to Change Brightness on Windows 11 [10 Ways Explained] Single monitor users can use the following methods to adjust brightness on Windows 11. This includes desktop systems using a single monitor as well as laptops. let's start. Method 1: Use the Action Center The Action Center is accessible

What are the differences between Huawei GT3 Pro and GT4? What are the differences between Huawei GT3 Pro and GT4? Dec 29, 2023 pm 02:27 PM

Many users will choose the Huawei brand when choosing smart watches. Among them, Huawei GT3pro and GT4 are very popular choices. Many users are curious about the difference between Huawei GT3pro and GT4. Let’s introduce the two to you. . What are the differences between Huawei GT3pro and GT4? 1. Appearance GT4: 46mm and 41mm, the material is glass mirror + stainless steel body + high-resolution fiber back shell. GT3pro: 46.6mm and 42.9mm, the material is sapphire glass + titanium body/ceramic body + ceramic back shell 2. Healthy GT4: Using the latest Huawei Truseen5.5+ algorithm, the results will be more accurate. GT3pro: Added ECG electrocardiogram and blood vessel and safety

Comparison and differences of SQL syntax between Oracle and DB2 Comparison and differences of SQL syntax between Oracle and DB2 Mar 11, 2024 pm 12:09 PM

Oracle and DB2 are two commonly used relational database management systems, each of which has its own unique SQL syntax and characteristics. This article will compare and differ between the SQL syntax of Oracle and DB2, and provide specific code examples. Database connection In Oracle, use the following statement to connect to the database: CONNECTusername/password@database. In DB2, the statement to connect to the database is as follows: CONNECTTOdataba

How to turn off private browsing authentication for iPhone in Safari? How to turn off private browsing authentication for iPhone in Safari? Nov 29, 2023 pm 11:21 PM

In iOS 17, Apple introduced several new privacy and security features to its mobile operating system, one of which is the ability to require two-step authentication for private browsing tabs in Safari. Here's how it works and how to turn it off. On an iPhone or iPad running iOS 17 or iPadOS 17, Apple's browser now requires Face ID/Touch ID authentication or a passcode if you have any Private Browsing tab open in Safari and then exit the session or app to access them again. In other words, if someone gets their hands on your iPhone or iPad while it's unlocked, they still won't be able to view your privacy without knowing your passcode

Usage of division operation in Oracle SQL Usage of division operation in Oracle SQL Mar 10, 2024 pm 03:06 PM

"Usage of Division Operation in OracleSQL" In OracleSQL, division operation is one of the common mathematical operations. During data query and processing, division operations can help us calculate the ratio between fields or derive the logical relationship between specific values. This article will introduce the usage of division operation in OracleSQL and provide specific code examples. 1. Two ways of division operations in OracleSQL In OracleSQL, division operations can be performed in two different ways.

Detailed explanation of the Set tag function in MyBatis dynamic SQL tags Detailed explanation of the Set tag function in MyBatis dynamic SQL tags Feb 26, 2024 pm 07:48 PM

Interpretation of MyBatis dynamic SQL tags: Detailed explanation of Set tag usage MyBatis is an excellent persistence layer framework. It provides a wealth of dynamic SQL tags and can flexibly construct database operation statements. Among them, the Set tag is used to generate the SET clause in the UPDATE statement, which is very commonly used in update operations. This article will explain in detail the usage of the Set tag in MyBatis and demonstrate its functionality through specific code examples. What is Set tag Set tag is used in MyBati

What does the identity attribute in SQL mean? What does the identity attribute in SQL mean? Feb 19, 2024 am 11:24 AM

What is Identity in SQL? Specific code examples are needed. In SQL, Identity is a special data type used to generate auto-incrementing numbers. It is often used to uniquely identify each row of data in a table. The Identity column is often used in conjunction with the primary key column to ensure that each record has a unique identifier. This article will detail how to use Identity and some practical code examples. The basic way to use Identity is to use Identit when creating a table.

See all articles