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Technical Articles

Database

Mysql Tutorial

mysql tutorial for PHP web development

To use PHP for MySQL web development, you must first master the connection to the database, perform query and data operations. 1. It is recommended to use mysqli extension to connect to the database. Create a connection through newmysqli() and check whether it is successful; 2. Use query() method to execute SQL queries, combine fetch_assoc() to traverse the result set, and pay attention to prevent preprocessing statements from being used to prevent SQL injection; 3. When inserting or updating data, use prepare() and bind_param() to bind parameters to ensure safe transmission of values; 4. Common errors include connection failure, query results, insertion conflicts, etc. You can troubleshoot problems by checking configuration, field names, constraint restrictions and opening error prompts. Master these basics

Jun 28, 2025 am 01:16 AM

how to connect to mysql database from python on windows

To connect to the MySQL database from Python on Windows, you need to install the mysql-connector-python or pymysql module and correctly configure the connection parameters and network permissions. 1. Install module: Use pipinstallmysql-connector-python or pipinstallpymysql; 2. Configure connection information: Provide host, user, password and database parameters. It is recommended to manage sensitive information through environment variables or configuration files; 3. Ensure that the database user has remote access rights (such as remote database); 4. Check the firewall settings to ensure that port 3306 is open; 5

Jun 28, 2025 am 01:06 AM

How to check for replication lag between a master and slave?

To check the replication delay between master and slave servers, you can achieve it in the following four methods: 1. Use built-in database commands to view the replication status, such as MySQL's SHOWSLAVESTATUS or PostgreSQL related query statements to directly obtain the delay indicator; 2. Use monitoring tools such as Prometheus, Zabbix or PMM to automatically detect and set alarms; 3. Create a heartbeat table at the application layer and update and query regularly to calculate the delay; 4. Troubleshoot whether system resource problems such as network bandwidth, server CPU, disk IO and other systems cause delays. These methods can effectively judge and deal with replication delay issues.

Jun 28, 2025 am 01:06 AM

mysql tutorial on command line basics

Using command-line operations after logging in to MySQL is the basis. 1. Use mysql-uroot-p to log in, exit with exit; or Ctrl D; 2. Use SHOWDATABASES to view the database; use USEyour_database_name to enter the database; 3. Use CREATEDATABASEnew_database_name to create the database; use DROPDATABASEdatabase_name to delete; 4. Use SHOWTABLES to view the table structure; use DESCRIBEtable_name to query the data; use SELECTFROMtable_name to avoid in production environments

Jun 28, 2025 am 12:29 AM

mysql tutorial on the SELECT statement

TheSELECTstatementisthemostcommonlyusedSQLcommandforretrievingdatafromMySQLdatabases,allowinguserstospecifywhichcolumnstoretrieve,filterrowsbasedonconditionsusingWHERE,andsortresultswithORDERBY.1)UseSELECTcolumn1,column2FROMtable_name;tofetchspecific

Jun 27, 2025 am 01:57 AM

connect to mysql from command line mac

The steps to connect to the MySQL database are as follows: 1. Make sure that MySQL is installed and run, use brewserviceslist to view the status, and if it is not started, use brewservicesstartmysql to start; 2. Use the mysql-u[username]-p command to connect to the local database, enter the password to enter the interactive interface, and the remote connection needs to be added with the -h[hostname or IP] parameter; 3. When encountering problems, if you cannot log in, you should check the user permissions. If the prompt command does not exist, use the full path. If the connection timeouts, check the firewall or configuration file binding.

Jun 27, 2025 am 01:57 AM

mysql workbench set query timeout

Setting the query timeout in MySQLWorkbench requires multiple indirect ways. 1. You can use SQL instructions such as SELECT/MAX_EXECUTION_TIME(5000)/*FROMyour_table; to limit the execution time of a single SELECT query; 2. Modify the session variables SETSESSIONwait_timeout=60; and SETSESSIONinteractive_timeout=60; to control the idle disconnection time of the connection, but do not terminate the executing query; 3. If you connect to the database through a script or program, it is recommended to set the query timeout in the code; 4. Select "Stan" in the connection configuration.

Jun 27, 2025 am 01:55 AM

Query timeout

How to set up a MySQL Master-Slave replication environment?

TosetupMySQLMaster-Slavereplication,firstensurebothserversarereadybyconfirmingversioncompatibility,networkconnectivity,staticIPs,andopenfirewallports.ThenconfigurethemasterserverbyenablingbinaryloggingandsettingauniqueserverID,followedbycreatingadedi

Jun 27, 2025 am 01:52 AM

mysql tutorial for Java JDBC connection

To use JDBC to connect to MySQL database, you must first add driver dependencies, then follow the steps to load the driver, establish a connection, execute SQL, and process the results. 1. Add mysql-connector-java dependency or manually introduce jar packages; 2. Use Class.forName("com.mysql.cj.jdbc.Driver") to load the driver; 3. Create a connection through the DriverManager.getConnection() method, pay attention to configuring the correct URL, username and password; 4. It is recommended to use PreparedStatement to prevent SQL injection; 5. Use connection pools (such as Hi

Jun 27, 2025 am 01:49 AM

how to import sql file in mysql workbench windows

To import SQL files to MySQLWorkbench, use the "DataImport" function or the "Query" method, paying attention to encoding, paths, and foreign key constraints. 1. Use DataImport: Open MySQLWorkbench, connect to the database instance, click DataImport, select ImportfromSelf-ContainedFile, browse and select the .sql file, select the target database in DefaultSchema (if none is created, create a new one), and finally click StartImport; 2. Note that the file path must be in English, the SQL file encoding should be UTF-8MB4 and ensure the database support, if it exists outside

Jun 27, 2025 am 01:47 AM

mysql tutorial using MySQL Workbench

ThisguideintroducesbeginnerstoMySQLWorkbenchbywalkingthroughkeystepssuchassettingupaconnection,runningqueries,creatingdatabasesandtables,usingthevisualtabledesigner,andmanagingdatawithbuilt-intools.1.Tosetupanewconnection,openMySQLWorkbench,clickthe&

Jun 27, 2025 am 01:41 AM

What are the binlog formats (STATEMENT, ROW, MIXED) and how to choose one?

The three modes of STATEMENT, ROW and MIXED need to be selected according to the scene. 1. STATEMENT mode records SQL statements with small log volume and strong readability, but may lead to inconsistency between master and slaves. It is suitable for log sensitive and simple SQL environments; 2. ROW mode records row changes, has high consistency, suitable for financial applications and data audits, but large logs and poor readability; 3. MIXED mode automatically switches, taking into account performance and consistency, and is suitable for general systems. If you pay attention to logs and determinism, choose STATEMENT; if you pay attention to consistency or use uncertain functions, choose ROW; if you consider the compromise, choose MIXED. Pay attention to storage engine compatibility and architecture requirements when setting up.

Jun 27, 2025 am 01:40 AM

database binlog

how to update mysql on mac using homebrew

Updating MySQL with Homebrew on Mac is not difficult, but you need to follow the steps to avoid conflicts or data loss; 1. First check the current MySQL version and service status, run mysql--version and brewserviceslist|grepmysql; 2. Back up the database before updating just in case; 3. After updating Homebrew itself, upgrade MySQL through brewupgrademysql. If you use a specific version such as mysql@5.7 or mysql@8.0, you may need to reinstall or manually migrate the data; 4. After upgrading, restart the service and enter MySQL to check the version information. If you have any prompts, you need to execute mysql_upgrad

Jun 27, 2025 am 01:36 AM

How to create a new user in mysql workbench

Creating a new user can be implemented in MySQLWorkbench through SQL statements or graphical interfaces. 1. Create a user using SQL statement: Execute CREATEUSER'new_user'@'host'IDENTIFIEDBY'password'; set the user name, host and password; 2. Grant permissions: Use GRANTALLPRIVILEGESONdatabase_name.table_nameTO'new_user'@'host'; and refresh the permissions through FLUSHPRIVILEGES; 3. Graphic interface method: enter "UsersandPrivileges&qu

Jun 27, 2025 am 01:29 AM

Create user