Found a total of 10000 related content
mysql tutorial for PHP web development
Article Introduction：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
2025-06-28
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997
PHP: The First Steps
Article Introduction：The key to the first step in learning PHP is to practice hands-on rather than get stuck in the details. First, you need to install the environment, use XAMPP, Laragon or MAMP to quickly build the server, put index.php into the directory and run it directly; secondly, start with the basic code, master echo output, variables, conditional statements and loops, and avoid mixing HTML and PHP from the beginning; then use MySQLi to familiarize yourself with SQL operations when connecting to the database, and then gradually transition to PDO; finally, when debugging, enable error prompts, troubleshoot problems through logs and var_dump(), and only when writing and searching for information can you truly master PHP.
2025-07-18
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445
Approaches to Scaling MySQL Database for High Load
Article Introduction：The MySQL stand-alone bottleneck can be solved through read and write separation, library separation, cache and asynchronous processing and other optimization methods. 1. Read and write separation is realized through master-slave replication. The main library processes write requests, and the slave library processes read requests, and combines connection pools to improve efficiency, but attention should be paid to the asynchronous replication delay problem; 2. The sub-repository sub-table includes vertical split (split by field) and horizontal split (split by rules), which is suitable for large data scenarios and requires middleware to handle complex queries; 3. Caching can reduce database pressure, use Redis or Memcached to cache hotspot data, and combines message queues to asynchronously process non-real-time write operations; 4. Other optimizations include slow query analysis, parameter tuning, connection pool management and SQL optimization, and detailed processing is crucial to performance improvement.
2025-07-08
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885
PostgreSQL WAL (Write-Ahead Log) and Replication with SQL
Article Introduction：WAL is the basis for PostgreSQL to achieve data consistency and high availability. It ensures that logs are logged before data modification, and supports crash recovery and replication. 1.WAL provides transaction persistence, and restores unfinished transactions through replay logs; 2. Master-slave replication depends on WAL log streaming; 3. Logical replication can be configured through SQL commands, such as creating publishing and subscriptions; 4. During configuration, it is necessary to ensure that the table structure is consistent, the permissions are correct, and logicalwal\_level is enabled; 5. Pay attention to replication delays and conflict handling, and it is recommended that the slave library be kept read-only.
2025-07-21
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1010
SQL Date Functions for Time Series Analysis
Article Introduction：To process time series data, you need to master the SQL date function. 1. Extract the date part: Use EXTRACT(), DATE_PART(), DAY(), MONTH() and other functions to group data by time dimension, such as counting sales or visits by month or hour. 2. Date addition and subtraction: Implement time window analysis through DATE_ADD() and INTERVAL, such as counting data from the past 24 hours or month-on-month. 3. Date formatting: Use TO_CHAR or DATE_FORMAT to unify the time dimension format for easy aggregation and matching. 4. Time series zero-complement: By generating a list of consecutive dates and connecting it to the original data, ensure that the missing dates are displayed as 0, and avoiding the trend chart being disconnected. Pay attention to different database languages
2025-07-27
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241
Top 22 Python Book for Beginners and Advanced Coders
Article Introduction：Python learning resources: From getting started to master
This article will dive into the best books for learning Python, covering different levels from beginners to advanced programmers, as well as different fields and learning methods. Ready? Let's sneak into the world of Python! ?
We also recently reviewed the best books for learning HTML, CSS, JavaScript, PHP, Node.js, and SQL.
Table of contents:
What is Python?
How to choose the best Python book?
Python Introduction Books
"Python Programming: A 7-Day Quick Python Guide"
"Learn Python in One Day and Being a Good Job: A Guide to Beginners in a Beginner in Hands-Original Projects"
2025-02-17
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849
Advanced String Formatting Techniques with `sprintf` and `vsprintf`
Article Introduction：sprintf and vsprintf provide advanced string formatting functions in PHP. The answers are: 1. The floating point accuracy and %d can be controlled through %.2f, and the integer type can be ensured with d, and zero padding can be achieved with d; 2. The variable position can be fixed using positional placeholders such as %1$s and %2$d, which is convenient for internationalization; 3. The left alignment and ] right alignment can be achieved through %-10s, which is suitable for table or log output; 4. vsprintf supports array parameters to facilitate dynamic generation of SQL or message templates; 5. Although there is no original name placeholder, {name} syntax can be simulated through regular callback functions, or the associative array can be used in combination with extract(); 6. Substr_co
2025-07-27
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612
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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865
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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1492
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
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1086
