The Mysql2 gem is meant to serve the extremely common use-case of connecting, querying and iterating on results. Some database libraries out there serve as direct 1:1 mappings of the already complex C ...

本文以 MySQL 8.0.35 的代码为例，尝试对 MySQL 中的并发访问控制进行一个整体的介绍。 前言 最开始学习数据库的时候都会被问到一个问题：“数据库系统相比与文件系统最大的优势是什么？”。具体的优势有很多，其中一个很重要的部分是：数据库系统能够进行 ...

A monthly overview of things you need to know as an architect or aspiring architect. Unlock the full InfoQ experience by logging in! Stay updated with your favorite authors and topics, engage with ...

In this guide, we will discuss how to select data from a table using MySQL LIKE operator and WHERE clause along with the SELECT command in a particular database using PHP in XAMPP. For demonstration ...

NodeMCU is a low-cost open-source IoT platform that initially included firmware which runs on the ESP8266 Wi-Fi SoC from Espressif Systems, and hardware which was based on the ESP-12 module. If you ...

介绍一款MySQL迁移PostgreSQL的自动化工具py-mysql2pgsql，该工具通过python使用不落地方式，或写出到文件方式（可选），直接将MySQL中的表结构转化到pg，并自动导入数据、自动在pg端创建相关索引。 2.MySQL迁移PostgreSQL数据类型转化 目前该工具可将以下38种数据类型 ...

本篇主要介绍 MySQL 的函数索引（也叫表达式索引）。 通常来讲，索引都是基于字段本身或者字段前缀（第 20 篇），而函数索引是基于字段本身加上函数、操作符、表达式等计算而来。如果将表达式或者操作符也看做函数的话，简单来说，这样的索引就可以统称 ...

A monthly overview of things you need to know as an architect or aspiring architect. Unlock the full InfoQ experience by logging in! Stay updated with your favorite authors and topics, engage with ...

This article will guide you through the installation and configuration stages of MySQL for your particular Operating System. What is a MySQL database? MySQL is a multi-user access database that stores ...

大神，再请教个问题：enterprisedb里的number类型是怎么实现的？查看了type，有numeric，但是没有number ... 可能edb把number实现成numeric的别名了，就像pg里的decimal一样。