国产69精品久久久久9999不卡,澳门永久av免费网站

Article Tags

All
web3.0
- All
- NoSQL database
- Memcached
- cloudera
- memcache
Backend Development
- All
- PHP Tutorial
- Python Tutorial
- Golang
- XML/RSS Tutorial
- C#.Net Tutorial
- C++
- NoSQL database
- Memcached
- cloudera
- memcache
Web Front-end
Database
- All
- Mysql Tutorial
- navicat
- SQL
- Redis
- phpMyAdmin
- Oracle
- MongoDB
- NoSQL database
- Memcached
- cloudera
- memcache
Operation and Maintenance
- All
- Mac OS
- Linux Operation and Maintenance
- Apache
- Nginx
- CentOS
- Docker
- NoSQL database
- Memcached
- cloudera
- memcache
Development Tools
- All
- VSCode
- sublime
- notepad
- git
- composer
- NoSQL database
- Memcached
- cloudera
- memcache
PHP Framework
- All
- Laravel
- YII
- NoSQL database
- Memcached
- cloudera
- memcache
Common Problem
- All
- NoSQL database
- Memcached
- cloudera
- memcache
Other
- All
- IIS
- SEO
- Premiere
- NoSQL database
- Memcached
- cloudera
- memcache
Tech
- All
- AI
- It Industry
- NoSQL database
- Memcached
- cloudera
- memcache
CMS Tutorial
- All
- WordPress
- NoSQL database
- Memcached
- cloudera
- memcache
Java
- All
- javaTutorial
- NoSQL database
- Memcached
- cloudera
- memcache
System Tutorial
- All
- Windows Series
- LINUX
- MAC
- NoSQL database
- Memcached
- cloudera
- memcache
Computer Tutorials
Hardware Tutorial
Mobile Tutorial
- All
- Mobile News
- iPhone
- Android Phone
- NoSQL database
- Memcached
- cloudera
- memcache
Software Tutorial
Mobile Game Tutorial

Home

Technical Articles

Database

phpMyAdmin export to JSON

phpMyAdmin does not directly support JSON export, but can be implemented through the following methods: 1. Use SQL query to generate JSON (recommended), use JSON_OBJECT() and JSON_ARRAYAGG() functions to directly query and export to JSON strings in MySQL5.7. Pay attention to adjusting the maximum display length of phpMyAdmin to prevent truncation; 2. Modify the phpMyAdmin configuration or use plug-ins (not recommended). Although feasible, there are security risks and upgrades are prone to failure; 3. Use PHP scripts to export (strongly recommended), connect to the database by writing a simple PHP script and call json_encode() to output JSON, which is flexible and controllable, suitable for frequent operation.

Aug 13, 2025 am 05:49 AM

java programming

Navicat Alternatives: Which has better support?

DBeaver,HeidiSQL,andDataGriparetopNavicatalternativeswithsuperiorsupport.1)DBeaveroffersrobust,community-drivensupportforvariousdatabases.2)HeidiSQLprovidesdirectdevelopersupport,idealforMySQLandMariaDB.3)DataGripbyJetBrainsoffersprofessionalsupporta

Aug 13, 2025 am 05:34 AM

How to pad a string with leading zeros in SQL

TopadastringwithleadingzerosinSQL,useLPADinMySQL,PostgreSQL,orOraclewithSELECTLPAD(column,length,'0');forSQLServer,useRIGHT(REPLICATE('0',length) CAST(columnASVARCHAR),length)orFORMAT(column,'000000')onSQLServer2012andlater,ensuringthecolumniscasttoa

Aug 13, 2025 am 05:16 AM

What Data Structures Does Redis Support That Traditional Databases Don't?

Redisstandsoutduetoitsuniquedatastructures:1)HyperLogLogforefficientcardinalityestimation,2)GeospatialIndexesforfastlocation-basedqueries,3)Streamsfortime-seriesdatamanagement,and4)Bitmapsfortrackingbinarystates,offeringflexibilityandperformancebeyon

Aug 13, 2025 am 04:52 AM

How to run a Synchronization job from the command line?

Synchronous tasks can be run through the command line by finding the tool's CLI command and configuring parameters to execute. 1. Confirm whether the synchronization tool used supports command line mode, such as rsync, robocopy, Syncthing, etc., and check the document to understand how to use it; 2. Specify parameters such as source path, target path, synchronization mode, and exclusion rules, such as rsync-avz--exclude='*.tmp'/path/to/source/user@remote:/path/to/destination/; 3. Write commands to the script file, give execution permissions, and can be manually run or set as timing tasks and system startup items; 4. Pay attention to the correctness of the path and user

Aug 13, 2025 am 04:50 AM

How to analyze and repair tables in MySQL?

Analyzeandrepairtableswhenqueriesslowdown,errorsindicatecorruption,oraftercrashes,especiallyforMyISAMtables.2.RunANALYZETABLEtoupdateindexstatisticsandimprovequeryoptimizerdecisions,lockingthetablebriefly.3.UseREPAIRTABLEtofixMyISAMcorruption,withopt

Aug 13, 2025 am 04:32 AM

How to format a date in SQL

Formatting dates in SQL depends on the database system used. MySQL uses the DATE_FORMAT() function with %Y, %m, %d and other formats. PostgreSQL uses the TO_CHAR() function and supports YYYY, MM, Month and other modes. SQLServer uses the FORMAT() function to provide flexible formatting similar to .NET. SQLite uses the STRFTIME() function to follow the strftime specification of C language. Each database has its own specific function and format code. The correct method needs to be selected according to the specific system to finally realize the custom output of the date format.

Aug 13, 2025 am 04:30 AM

How to work with parts of a string using GETRANGE and SETRANGE?

GETRANGE is used to extract substrings of Redis strings, by specifying the start and end byte positions; SETRANGE is used to overwrite part of the string starting from the specified offset. For example, GETRANGEkey04 can get the first 5 characters, while SETRANGEkey6 "Redis" can replace the content starting from the 7th character. Note when using: ① The index starts at 0 and supports negative numbers; ② SETRANGE will be overwritten in place and will not insert or move characters; ③ The offset exceeds the current length will cause the string to expand and fill in empty bytes. Applicable scenarios include efficient partial updates, binary security operations and fixed format string processing, but the string structure must be ensured to be stable.

Aug 13, 2025 am 03:40 AM

String operations

How to rollback a transaction in MySQL

To roll back transactions in MySQL, you must use a transaction-enabled storage engine such as InnoDB. 1. Confirm the table to use InnoDB: SHOWCREATETABLEyour_table_name; if not InnoDB, execute ALTERTABLEyour_table_nameENGINE=InnoDB; 2. Start the transaction explicitly: use STARTTRANSACTION or BEGIN; 3. Execute SQL statements such as UPDATEaccountsSETbalance=balance-100WHEREuser_id=1; and UPDATEaccountsSETbalance

Aug 13, 2025 am 03:26 AM

mysql 事務(wù)回滾

How to rename a table in MySQL?

TorenameatableinMySQL,usetheRENAMETABLEstatement,whichchangesthetable'snamebyupdatingmetadatawithoutalteringthedata,ensuringafastoperation;forexample,executeRENAMETABLEold_table_nameTOnew_table_nametorenameasingletable,orincludemultiplerenamesinoneco

Aug 13, 2025 am 03:03 AM

mysql 重命名表

phpMyAdmin import SQL file

ToimportanSQLfileintophpMyAdmin,firstaccessphpMyAdminandselectorcreatethetargetdatabase,thenclickthe"Import"tab,choosetheSQLfile,ensuretheformatissettoSQL,andclick"Go"toexecutetheimport;commonissuesincludefilesizelimits—resolvebyi

Aug 13, 2025 am 01:41 AM

How to use table aliases in SQL?

Atablealiasisatemporarynameforatableinaquery,createdusingtheASkeywordoraspace.2.Aliasesshortenlongtablenames,improvereadabilityinjoins,andarerequiredinself-joins.3.Examplesincludeusing'c'forcustomers,'o'fororders,anddistinguishingemployeefrommanageri

Aug 13, 2025 am 01:36 AM

How to handle deadlocks in SQL

Deadlocks cannot be completely avoided in SQL, but can be effectively managed through prevention, processing and monitoring. 1. Minimize deadlocks by design: All transactions access tables in a consistent order, keep transactions short, use appropriate isolation levels (such as READCOMMITTED or SNAPSHOTISOLATION), create indexes reasonably to reduce lock range, use NOLOCK with caution or enable READCOMMITTEDSNAPSHOT to reduce blocking. 2. Elegantly handle deadlocks in application code: capture database-specific deadlock errors (such as SQLServer 1205, PostgreSQL 40001), and implement retry logic, usually retry 3-5 times and add a short delay to ensure that the operation is

Aug 13, 2025 am 01:21 AM

sql deadlock

How to troubleshoot ORA-12541: TNS:no listener

First, confirm whether the listener on the database server has been started, use lsnrctlstatus to check, if it is not running, execute lsnrctlstart to start; 2. Check whether the HOST and PORT settings in the listener.ora configuration file are correct, avoid using localhost, and restart the listener after modification; 3. Use the netstat or lsof command to verify whether the listener is listening on the specified port (such as 1521). The client can test port connectivity through telnet or nc; 4. Ensure that the server and network firewall allow the listening port communication, the Linux system needs to be configured with firewalld or iptables, and Windows needs to enable inbound

Aug 13, 2025 am 01:10 AM