mysql-PHP-MySQL always increments by 4 and cannot increment by 1-Mysql Tutorial-php.cn

Home

Database

Mysql Tutorial

mysql-PHP-MySQL always increments by 4 and cannot increment by 1

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Oct 09, 2016 am 08:32 AM

mysqlphp

The code is as follows: when the ct value is 4, the output is 4 5 5, but at this time the actual value of ct in the database is 8, and the self-increasing method using the commented out sentence is the same. 4. Please ask God to solve it
Add that there is no problem in executing comments in phpmyadmin

<code>$count = mysql_query("SELECT ct FROM count WHERE class='counter';");//mysql_query("UPDATE count SET ct=ct+1 WHERE class='counter';");if($row = mysql_fetch_row($count)){ echo $row[0]." "; $row[0]++; echo $row[0]." "; mysql_query("UPDATE count SET ct=$row[0] WHERE class='counter';"); echo $row[0]." "; echo mysql_error();}mysql_close();</code>

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

How do you alter a table in MySQL using the ALTER TABLE statement?Mar 19, 2025 pm 03:51 PM

The article discusses using MySQL's ALTER TABLE statement to modify tables, including adding/dropping columns, renaming tables/columns, and changing column data types.

How do I configure SSL/TLS encryption for MySQL connections?Mar 18, 2025 pm 12:01 PM

Article discusses configuring SSL/TLS encryption for MySQL, including certificate generation and verification. Main issue is using self-signed certificates' security implications.[Character count: 159]

What are some popular MySQL GUI tools (e.g., MySQL Workbench, phpMyAdmin)?Mar 21, 2025 pm 06:28 PM

Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]

How do you handle large datasets in MySQL?Mar 21, 2025 pm 12:15 PM

Article discusses strategies for handling large datasets in MySQL, including partitioning, sharding, indexing, and query optimization.

How do you drop a table in MySQL using the DROP TABLE statement?Mar 19, 2025 pm 03:52 PM

The article discusses dropping tables in MySQL using the DROP TABLE statement, emphasizing precautions and risks. It highlights that the action is irreversible without backups, detailing recovery methods and potential production environment hazards.

How do you create indexes on JSON columns?Mar 21, 2025 pm 12:13 PM

The article discusses creating indexes on JSON columns in various databases like PostgreSQL, MySQL, and MongoDB to enhance query performance. It explains the syntax and benefits of indexing specific JSON paths, and lists supported database systems.

How do I secure MySQL against common vulnerabilities (SQL injection, brute-force attacks)?Mar 18, 2025 pm 12:00 PM

Article discusses securing MySQL against SQL injection and brute-force attacks using prepared statements, input validation, and strong password policies.(159 characters)

How do you represent relationships using foreign keys?Mar 19, 2025 pm 03:48 PM

Article discusses using foreign keys to represent relationships in databases, focusing on best practices, data integrity, and common pitfalls to avoid.

See all articles