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Technical Articles

Database

How to connect to a MySQL database using PHP?

Use MySQLi (procedural style) to connect to the database through the mysqli_connect() function and close the connection with mysqli_close(); 2. Use MySQLi (object-oriented style) to create connections through newmysqli(), and the code is clearer; 3. It is recommended to use PDO, because it supports multiple databases, and secure connections can be achieved through newPDO() and set exception mode; preprocessing statements should always be used to prevent SQL injection, store database credentials in configuration files outside the root directory of the web, and avoid displaying original error messages in the production environment. Finally, select MySQLi or PDO, but the abandoned mysql_* function cannot be used.

Aug 06, 2025 am 04:56 AM

How to insert data into a table using phpMyAdmin

LogintophpMyAdminviayourhostingproviderlikecPanel.2.Selectyourtargetdatabaseandtablefromtheleft-handpanel.3.Clickthe"Insert"tabatthetopofthetableview.4.Entervaluesforeachcolumn,leavingAUTO_INCREMENTandnullablefieldsblankifappropriate.5.Uset

Aug 06, 2025 am 04:47 AM

Data insertion

phpMyAdmin cannot log in to the MySQL server

The common reasons and solutions for phpMyAdmin cannot log in to the MySQL server are as follows: 1. Confirm whether the MySQL service is running, Linux uses the systemctl command to check and start, and Windows starts in the service manager; 2. Check the phpMyAdmin's config.inc.php configuration file to ensure that the host, port, auth_type, etc. are set correctly. It is recommended to use cookie authentication in the production environment; 3. Solve the MySQL user permission problem. If the root user uses the cache_sha2_password plug-in, it should be changed to mysql_native_password to be compatible with the old version of ph

Aug 06, 2025 am 04:35 AM

php java

How to get all fields and values from a hash using HGETALL?

HGETALL returns all fields and values in the hash table, and the results are presented in a flat list of alternating field values. For example: executing HGETALLuser:1 will return field value pairs such as "name", "Alice", "age", and "30" in turn. When using different clients, most libraries such as Python's redis-py, Node.js' ioredis, etc. will automatically convert the results into dictionaries or objects; if manually parsed, they need to be paired in order. Alternatives should be considered when facing large hashes, including using HSCAN paging to obtain, locally cache stable data, or splitting

Aug 06, 2025 am 04:29 AM

What is a self-join in SQL and when would you use it?

Aself-joinisusedwhenyouneedtocompareorlinkrowswithinthesametable,especiallyforhierarchicalorrelationaldata.1.Useaself-joinforhierarchicaldata,suchasemployee-managerrelationships,byjoiningthetabletoitselfusingaliasestomatchaforeignkey(e.g.,manager_id)

Aug 06, 2025 am 04:08 AM

How to use multiple result tabs in Navicat?

Enable Navicat multi-result tab function to improve the efficiency of multi-query comparison. Enter the settings and check "Create a new tab page every time you execute a query" to automatically display the results separately; drag and drop the tab page or use the split window function to achieve split screen viewing; improve management efficiency by renaming, closing useless tags and using shortcut keys Ctrl Tab or Cmd \.

Aug 06, 2025 am 03:58 AM

How to check for NULL values in SQL?

Checking NULL values in SQL cannot use an equal sign, but ISNULL or ISNOTNULL. 1. Use ISNULL to find null values, such as SELECT*FROMusersWHEREemailISNULL; 2. Use ISNOTNULL to find non-null values, such as SELECTnameFROMusersWHEREphoneISNOTNULL; 3. Use COALESCE or IFNULL functions to replace NULL values, such as SELECTname, COALESCE(email,'no mailbox')ASemailFROMusers; 4. Note that NULL cannot be judged by comparison operators, such as

Aug 06, 2025 am 03:36 AM

sql null value

How to use MySQL with Docker for development environments?

RunMySQLinaDockercontainerusingtheofficialimagewithenvironmentvariablesforrootpassword,database,andusersetup.2.PersistdatabymountinganamedvolumeorhostdirectorytostoreMySQLfiles.3.ConnectviaMySQLCLIinsidethecontaineroraclientonthehostusinglocalhostand

Aug 06, 2025 am 03:33 AM

What is a Redis Sorted Set (ZSET) and how does it differ from a regular Set?

ARedisSortedSet(ZSET)isadatastructurethatstoresuniqueelements,eachassociatedwithascoretomaintainasortedorder.1.Elementsaresortedbytheirfloating-pointscoresinascendingorder.2.Membersareunique,butmultiplememberscanhavethesamescore,leadingtolexicographi

Aug 06, 2025 am 03:32 AM

SQL Server Instance Level Security

Security settings at the SQLServer instance level are crucial, and protection should be strengthened from four aspects: login account, server role, network protocol and audit mechanism. 1. Manage login accounts: Follow the principle of minimum permissions, disable or delete unnecessary accounts (such as SA), avoid using SA account for daily operations, and restrict remote login. 2. Configure server roles: Assign appropriate server roles according to responsibilities, such as securityadmin and serveradmin, avoid abuse of sysadmin roles, and regularly review role members. 3. Strengthen network and protocol security: enable SSL/TLS encrypted connections, restrict IP access, and close unnecessary protocols (such as NamedPipes). 4. Audit and logging:

Aug 06, 2025 am 02:32 AM

How to configure HTTP tunnel in Navicat?

HTTP tunneling is to forward database requests through an intermediate server to bypass firewall restrictions. 1. When opening Navicat to create a connection, switch to the "Advanced" tab; 2. Check "Use HTTP Tunnel" and fill in the tunnel address, username and password (optional), target host and port; 3. Pay attention to ensuring that the tunnel script is available, check the intermediate server environment, configure SSL settings, and handle firewall and proxy issues; 4. Test the connection and adjust the configuration according to the error prompts. As long as the script and server are correct, fill in the parameters correctly to achieve a secure connection to the remote database.

Aug 06, 2025 am 02:31 AM