This article collects 10 articles about the mysql_affected_rows() function and recommends it to everyone 1. PHP interview question 5 - MySQL database (basic part) mysql database download 64-bit sql database instance download sql database patch download introduction : Mysql database: PHP interview question No. 5 - MySQL database (basic part): mysql_num_rows() mysql_affected_rows() Both functions act on the results of the mysql_query($query) operation, and mysql_num_rows() returns the number of rows in the result set. mysql_affected_rows() gets the number of record rows affected by the previous MySQL operation. mysql_num_rows() is only valid for SELECT statements, to get the number of changed rows after INSERT, UPDATE or DE2. PHP updates mysql to get the number of changed rows_PHP tutorial introduction: PHP updates mysql to get the number of changed rows. A php update
1. affected 10 content recommendations
Introduction: This article collects 10 articles about the mysql_affected_rows() function, recommended to everyone 1. PHP interview question 5 - MySQL database (basic part) mysql database download 64-bit sql database instance download sql database patch Download introduction: Mysql database: PHP interview question No. 5 - MySQL database (basic part): mysql_num_rows() mysql_affected_rows() Both functions act on mysql_qu...
2 . 10 recommended articles about the get_browser() function
##Introduction: 1. Through $ _SERVER['HTTP_USER_AGENT'] to write a PHP method to determine the browser type. function my_get_browser(){ if(empty($_SERVER['HTTP_USER_AGENT'])){ return 'Command line, the robot is here! '; } if(false!==strpos($_SERVER['HT...
3. A summary of articles about the mysql_num_rows() function
Introduction: This article collects 10 articles about the mysql_affected_rows() function and recommends it to everyone 1. PHP interview question No. 5 - MySQL database (basic part) mysql database download 64-bit sql database instance download sql database patch download Introduction: Mysql database: PHP interview question No. 5 - MySQL database (basic part): mysql_num_rows() Both mysql_affected_rows() functions act on mysql_qu...
4. Mysql_affected_rows function definition and usage summary
Introduction: This article collects 10 articles about the mysql_affected_rows() function and recommends it to everyone 1. PHP interview question 5 - MySQL database (basic Part) mysql database download 64-bit sql database instance download sql database patch download introduction: Mysql database: PHP interview question 5 - MySQL database (basic part): mysql_num_rows() mysql_affected_rows() Both functions act on mysql_qu.. .
##5.10 recommended articles about the mysql_affected_rows() function
6.
About exception handling 10 articles recommended
## Introduction: This article mainly introduces exceptions and packages in the basics of Java. Friends in need can refer to 1 Exception System • ThrowableError usually occurs when major problems occur, such as: the running class does not exist or memory overflows, etc. If you do not write code to handle Exception at runtime, you can use try. The subclass names of catch finallyException and Error are suffixed with the parent class name. 1.1 Methods in Throwable 1.2 throws and th...
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简介:1、通过 $_SERVER['HTTP_USER_AGENT'] 来写一个php判断浏览器类型的办法。function my_get_browser(){ if(empty($_SERVER['HTTP_USER_AGENT'])){ return '命令行,机器人来了!'; } if(false!==strpos($_SERVER['HT...
8. 关于mysqli_affected_rows()函数的详细介绍
简介:这篇文章主要介绍了PHP中mysqli_affected_rows作用行数返回值,实例分析了普通模式与oop模式的用法,具有一定的参考借鉴价值,需要的朋友可以参考下本文实例分析了PHP中mysqli_affected_rows作用行数返回值。分享给大家供大家参考。具体分析如下:mysqli中关于update操作影响的行数可以有两种返回形式:1. 返回匹配的行数2. 返回影响的行数默认情况下mysq...
9. 有关php get_browser函数的文章推荐10篇
简介:1、通过 $_SERVER['HTTP_USER_AGENT'] 来写一个php判断浏览器类型的办法。function my_get_browser(){ if(empty($_SERVER['HTTP_USER_AGENT'])){ return '命令行,机器人来了!'; } if(false!==strpos($_SERVER['HT...
10. 有关内核版本的10篇内容推荐
简介:php获取浏览器内核版本
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The above is the detailed content of 10 content recommendations from rows. For more information, please follow other related articles on the PHP Chinese website!

MySQLhandlesconcurrencyusingamixofrow-levelandtable-levellocking,primarilythroughInnoDB'srow-levellocking.ComparedtootherRDBMS,MySQL'sapproachisefficientformanyusecasesbutmayfacechallengeswithdeadlocksandlacksadvancedfeatureslikePostgreSQL'sSerializa

MySQLhandlestransactionseffectivelyusingtheInnoDBengine,supportingACIDpropertiessimilartoPostgreSQLandOracle.1)MySQLusesREPEATABLEREADasthedefaultisolationlevel,whichcanbeadjustedtoREADCOMMITTEDforhigh-trafficscenarios.2)Itoptimizesperformancewithabu

MySQL data types are divided into numerical, date and time, string, binary and spatial types. Selecting the correct type can optimize database performance and data storage.

Best practices include: 1) Understanding the data structure and MySQL processing methods, 2) Appropriate indexing, 3) Avoid SELECT*, 4) Using appropriate JOIN types, 5) Use subqueries with caution, 6) Analyzing queries with EXPLAIN, 7) Consider the impact of queries on server resources, 8) Maintain the database regularly. These practices can make MySQL queries not only fast, but also maintainability, scalability and resource efficiency.

MySQLisbetterforspeedandsimplicity,suitableforwebapplications;PostgreSQLexcelsincomplexdatascenarioswithrobustfeatures.MySQLisidealforquickprojectsandread-heavytasks,whilePostgreSQLispreferredforapplicationsrequiringstrictdataintegrityandadvancedSQLf

MySQL processes data replication through three modes: asynchronous, semi-synchronous and group replication. 1) Asynchronous replication performance is high but data may be lost. 2) Semi-synchronous replication improves data security but increases latency. 3) Group replication supports multi-master replication and failover, suitable for high availability requirements.

The EXPLAIN statement can be used to analyze and improve SQL query performance. 1. Execute the EXPLAIN statement to view the query plan. 2. Analyze the output results, pay attention to access type, index usage and JOIN order. 3. Create or adjust indexes based on the analysis results, optimize JOIN operations, and avoid full table scanning to improve query efficiency.

Using mysqldump for logical backup and MySQLEnterpriseBackup for hot backup are effective ways to back up MySQL databases. 1. Use mysqldump to back up the database: mysqldump-uroot-pmydatabase>mydatabase_backup.sql. 2. Use MySQLEnterpriseBackup for hot backup: mysqlbackup--user=root-password=password--backup-dir=/path/to/backupbackup. When recovering, use the corresponding life


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