database table field

First paradigm: Ensure the atomicity of each column.If each column (or each attribute) is the smallest data unit (also known as the smallest atomic unit) that is not re-divided, the first normal form is satisfied.Example: Customer table (name,

The book said a lot, summed up 3 words:1NF: The field is not divided;2NF: Primary key, non primary key field dependent primary key;3NF: Non-primary key fields cannot be dependent on each other;Explain:1NF: Atomic field can not be divided, otherwise

MyBatis as an ORM lightweight framework to attract countless people's eyeballs, than hibernate to simple and easy to get started, the following start my first MyBatis program. First, download the MyBatis package We know that any frame will have

In the site development, often simple use of JS code to determine the number of characters in the string of features. Today, a small compilation of time to share the implementation code. No more nonsense to say, directly to everyone paste code.

Basic concepts of ORM (O/R mappping Object Relational mapping) In our system, there are a large number of objects that need to be persisted, such objects may be various business documents, or our system configuration information. Other objects that

xml| Data | database A Review of Remote Database administerA few years ago, the Cgi-bin module was used as a remote management database. Now, Cgi-bin is being used more and less because it runs slowly and is difficult to maintain.In recent years,

solr6.x Deployment in TOMCAT8 (entry level) The company's recent projects want to introduce full text indexing function, the recommendation of solr, so I searched the internet myself some information, found that a lot of blog write a variety of,

Method One, modify the php.ini file (of course depending on your page situation to set or can be Utf-8 code.) The code is as follows Copy Code ; mssql.charset = "Iso-8859-1"Mssql.charset = "GBK" Method two,

Talking about PHP security and anti-SQL injection, prevent XSS attack, anti-theft chain, anti-CSRF Objective: First of all, the author is not a web security experts, so this is not a Web security expert-level article, but learning notes, careful

//*******************************************************************A database operation class is constructed here to encapsulate all database operationscan be extended to facilitate the use of background management programsClass MySQLdb{var

Because you have been using Windows PHP development, with the MySQL database, and occasionally will encounter the query records garbled, that is because the PHP code does not support the Chinese lead, directly to encode decoding can be solved, so

Summarized as follows: 1. Stored procedures: batch processing of SQL statements, face applications and services, the common continuous operation into batch form. Solve the bottleneck problem: a large number of SQL query speed slow s 2.

1. Before designing the database (Requirements analysis phase) 1 understand customer needs, ask users how to view the future changes in demand. Let customers explain their needs, and as development continues, ask customers frequently to ensure that

Design | data | database | Database design A successful management system is made up of: [50% of the Business + 50% software], and 50% of the success of the software has [25% database + 25% of the program], the database design is a good or bad is a

Mysql Actually, it's not a file system in the usual sense, it doesn't have disk space,Instead, you use the MySQL daemon to store the data. You can put SQL tables andSome functions are implemented through the file system. First, how to achieve? Let's

Sort | Data This control is purely for practice, so no consideration is given to using a DataGrid instead. Where the control is insufficient: 1, when the parent form is run, the dataset is populated, Listviewex can not automatically judge the

Asp.net| Architecture Do not be intimidated by the title, in fact, very simple. Or you can only write the noodle-style program for life. In particular, ASP programmers are mostly written in the 3 in 1 (Ultra-platinum version: P) of the program, can

This is a development of the Linux file system, Linux can be the MySQL database as a file system to deal with. The development team would like to get more advice, as the following article translates from: In fact, this is not the usual file system,

Based on his years of practical experience, the author systematically expounds the thought, method and matters needing attention of using Erwin for database modeling, which has some practical value. ERWin Data Modeler is a database modeling tool of

oracle| Data | Application Example Introduction to Oracle Database Dictionaries Oracle data dictionaries consist of tables and views that store some database objects about database structure information. The database dictionary describes how the