


Php connection and common code for reading and writing mysql database, php writing mysql database_PHP tutorial
Common code for Php connection and reading and writing mysql database, php writes mysql database
Since you have read this article now, it means that you must know what PHP and MySQL are, so I won’t go into details. But why are you continuing to read this article? Maybe you were used to copying and pasting some codes before, and didn’t really understand the meaning of the code; maybe you understood it before, but like me, you haven’t been in contact with it for a while and are rusty; or someone asked you something simple like this Question, but you didn’t bother to answer it, just searched online, and happened to find this article, so I recommended it to so and so...
Anyway, here I summarize the commonly used methods of connecting PHP to MySQL database and reading and writing to the database. I hope it can help you, and of course it is also used as a review summary for myself.
1. In order to better set up the data connection, the values involved in the data connection are generally defined as variables.
$mysql_server_name='localhost'; //改成自己的mysql数据库服务器 $mysql_username='root'; //改成自己的mysql数据库用户名 $mysql_password='123456'; //改成自己的mysql数据库密码 $mysql_database='Mydb'; //改成自己的mysql数据库名
You can also put the above variables in a file, which can be called by other files at any time.
For example: put the above content in: db_config.php and call it directly on other pages that need to use the database.
Calling code: require("db_config.php");
2. Connect to the database
$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password) or die("error connecting") ; //连接数据库 mysql_query("set names 'utf8'"); //数据库输出编码 应该与你的数据库编码保持一致.南昌网站建设公司百恒网络PHP工程师建议用UTF-8 国际标准编码. mysql_select_db($mysql_database); //打开数据库 $sql ="select * from news "; //SQL语句 $result = mysql_query($sql,$conn); //查询
3. Read the contents of the table. Here we use while, but you can use for or others according to the specific situation.
while($row = mysql_fetch_array($result)) { echo "<div style=\"height:24px; line-height:24px; font-weight:bold;\">"; //排版代码 echo $row['Topic'] . "<br/>"; echo "</div>"; //排版代码 }
4.php writes to database, Mysql data writing
$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password); //连接数据库 mysql_query("set names 'utf8'"); //数据库输出编码 mysql_select_db($mysql_database); //打开数据库 $sql = "insert into messageboard (Topic,Content,Enabled,Date) values ('$Topic','$Content','1','2011-01-12')"; mysql_query($sql); mysql_close(); //关闭MySQL连接
Connection: mysql_connect("Host","User","Password");
mysql_select_db("Database name");
Write data: mysql_query("insert into table name(field 1, field 2) values ("data 1", "data 2")");
Your question is too vague, so I can only give you this answer. If you don't understand, ask further.
/*
Take data.txt as an example
When data is stored in a text document
fputs("data.txt","$str1\t $str2\r\n");
In this form!
*/
$str = file_get_contents("data.txt") or die("File opening failed");
$ r = explode("\r\n",$str);
/*
....Connect to the database
*/
$sql = "insert into `table`('id' ,'num') values ('".$r[0]."','".$r[1]."')";
mysql_query($sql);
// The above code has not been tested. If you have any questions, please ask me
?>

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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