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  • mysql event scheduler example
    mysql event scheduler example
    To enable MySQL event scheduler, 1. Use SHOWVARIABLESLIKE'event_scheduler'; view the status; 2. If OFF, add event_scheduler=ON in the configuration file or run SETGLOBALevent_scheduler=ON; Create Event example: Update the "to be paid" order status for more than 30 days at 2 am every day to "cancel". The statement includes the specified name, execution frequency, start time and SQL to be executed; manage Events include SHOWEVENTS, modify ALTEREVENT, and delete DROPEVENT; Notes include permissions
    Mysql Tutorial . Database 530 2025-07-11 03:06:00
  • Creating Hyperlinks for Navigation with the HTML a Tag
    Creating Hyperlinks for Navigation with the HTML a Tag
    Using HTML tags, you can use the href attribute to realize page jump, open new windows, positioning within pages and email and phone link functions. 1. Basic usage: Specify the target address through href, such as accessing a web page; 2. Open a new window: add target="_blank" and rel="noopener" attributes; 3. Jump within the page: combine id and # symbol to achieve anchor point positioning; 4. Email phone link: use mailto: or tel: protocol to trigger system applications.
    HTML Tutorial . Web Front-end 220 2025-07-11 03:03:02
  • What is PHP Dependency Injection and its benefits?
    What is PHP Dependency Injection and its benefits?
    DependencyinjectioninPHPisadesignpatternthatenhancesflexibilityandtestabilitybyallowingdependenciestobepassedintoclassesratherthanhardcoded.Insteadofcreatingdependenciesinsideaclass,suchas$this->db=newDatabase();,dependencyinjectionpassesthemviaco
    PHP Tutorial . Backend Development 673 2025-07-11 03:02:41
  • mysql update statement with join
    mysql update statement with join
    In MySQL, using UPDATE combined with JOIN can update data according to the association table. The syntax is: UPDATE table 1JOIN table 2ON condition SET field = value WHERE condition; common uses include: 1. Use commas to separate multiple assignment expressions when updating multiple fields; 2. Use LEFTJOIN to avoid missing main table records, and use IFNULL to process null values; 3. Use alias and add qualifiers to prevent field conflicts; precautions include: WHERE condition position affects logic, be sure to limit the update range, and it is recommended to use SELECT to verify the matching result before execution.
    Mysql Tutorial . Database 995 2025-07-11 03:02:20
  • What is the cite attribute on and tags?
    What is the cite attribute on and tags?
    The cite attribute of HTML is used to specify the source for the reference content in and. Its main functions include: 1. Improve the accessibility experience, where screen readers can provide context; 2. Indirectly enhance SEO to help search engines understand the content structure and source; 3. Improve code readability through semantic marking. Although the browser does not display cite content by default, it can be visualized by manually adding or using CSS's ::after pseudo-element. In addition, the cite attribute should be used with visible attributions (such as "-Author" or link) and must be ensured to point to a valid URL to ensure that the user has an intuitive understanding of the source of the reference.
    HTML Tutorial . Web Front-end 511 2025-07-11 03:01:22
  • How to use substr_replace in PHP
    How to use substr_replace in PHP
    substr_replace is a function in PHP to replace the contents of the specified position in a string. Its syntax is substr_replace($string,$replace,$start,$length), where $start represents the start position and $length is an optional parameter that represents the replacement length. For example, substr_replace("Helloworld!","PHP", 6, 5) output HelloPHP! Common uses include: 1. Replace the content of the specified location, such as replacing "sunny" with "rainy&quo
    PHP Tutorial . Backend Development 864 2025-07-11 03:00:40
  • What is the role of the `__construct` and `__destruct` methods in php classes?
    What is the role of the `__construct` and `__destruct` methods in php classes?
    InPHP,__constructand__destructarespecialmethodsusedforobjectinitializationandcleanup.1.__constructrunsautomaticallywhenanobjectiscreated,allowingsetupactionslikeassigninginitialvaluesorconnectingtoadatabase.2.Itcanacceptargumentsandiscommonlyusedtoin
    PHP Tutorial . Backend Development 866 2025-07-11 03:00:02
  • how to check mysql version
    how to check mysql version
    To view the version of MySQL, there are several ways to do it. 1. Use the command line: Enter mysql--version or mysql-V in the terminal or CMD; 2. Execute SQL query in the MySQL client: SELECTVERSION(); or SHOWVARIABLESLIKE'version'; 3. Windows users can use command prompt or PowerShell to enter the bin folder of the MySQL installation directory to run commands; 4. Graphical tools such as MySQLWorkbench, phpMyAdmin, etc. also support viewing version information, which is suitable for users who are not familiar with the command line. Different methods apply to different scenarios:
    Mysql Tutorial . Database 815 2025-07-11 02:58:21
  • php date to timestamp
    php date to timestamp
    There are two main ways to convert date strings to Unix timestamps in PHP. 1. Use the strtotime() function to be suitable for date strings in standard formats, such as "2024-12-2514:30:00", but the processing of non-standard or Chinese format is weak; 2. Use the DateTime::createFromFormat() method to accurately match the specified format, which is suitable for processing non-standard format data, such as user input or CSV data; 3. For date strings containing Chinese characters, they can be converted into standard format first through str_replace() or regular expression before parsing. When selecting a method, you need to judge based on the specific scene: use strto for simple scenes
    PHP Tutorial . Backend Development 998 2025-07-11 02:55:40
  • how to generate uuid in mysql
    how to generate uuid in mysql
    InMySQL,UUIDsaregeneratedusingtheUUID()functionandfollowversion1standards,combiningaserver'sMACaddresswithatimestamp.TogenerateaUUID,useSELECTUUID();orinsertitintoatablewithINSERTINTOusers(id,name)VALUES(UUID(),'Alice');.EnsurethecolumnisCHAR(36)fore
    Mysql Tutorial . Database 810 2025-07-11 02:55:01
  • Does closing the browser destroy the PHP session?
    Does closing the browser destroy the PHP session?
    Close the browser will not automatically destroy the PHP session, depending on the session configuration. 1. By default, PHP uses session cookies without expiration time. Close the browser will delete the cookie, but the server-side session data still exists until it is cleaned up by the garbage collection mechanism; 2. If the expiration time of the cookie is manually set, closing the browser will not delete the cookie, and the user can still resume the session the next time he accesses; 3. To ensure that closing the browser ends the session, the default behavior or explicitly clear the cookie and session data; 4. Server-side cleanup is not instant, and it depends on configuration parameters such as session.gc_maxlifetime and garbage collection mechanism. Therefore, configure the session settings reasonably and implement
    PHP Tutorial . Backend Development 157 2025-07-11 02:54:01
  • What is the aria-live attribute and when should you use it?
    What is the aria-live attribute and when should you use it?
    Thearia-liveattributemakesdynamicwebcontentaccessiblebyannouncingchangestoscreenreaderusers.Itdesignates"live"regionswhereupdatesareautomaticallyreadwhentheychange,usingvalueslikeoff,polite,andassertive.1.Usepolitefornon-urgentupdateslikefo
    HTML Tutorial . Web Front-end 532 2025-07-11 02:53:21
  • Understanding Character Sets and Collations in MySQL
    Understanding Character Sets and Collations in MySQL
    The character set determines which characters are stored in the database, and it is recommended to use utf8mb4; the sorting rules affect comparison and sorting behavior. Commonly used character sets include latin1, utf8, and utf8mb4, among which utf8mb4 supports emoji. Common sorting rules include utf8mb4_unicode_ci (case insensitive), utf8mb4_bin (case sensitive), and utf8mb4_0900_ci (modern language habits). Set the level from high to low to: Connection layer > Table level > Database level > Server global. The configuration methods are: the server level is set in my.cnf or my.ini, specified when the database level is created, and defined when the table level is created.
    Mysql Tutorial . Database 379 2025-07-11 02:50:01
  • How to use the map and area tags for an HTML image map?
    How to use the map and area tags for an HTML image map?
    To set different parts of the image, click links, use HTML and tags. 1. Use the usemap attribute of the tag to associate it with the element of the specified name; 2. Add multiple tags to define each area; 3. Each sets the shape, coordinates and links through shape, coords and href respectively. Ensure image size matches coordinates and use alt and title attributes to enhance accessibility and prompt information.
    HTML Tutorial . Web Front-end 180 2025-07-11 02:48:31

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