database table field

Original address: http://www.cnblogs.com/qiusnay/archive/2010/03/15/1686500.html 3. Performance and efficiency 5.3. Fixed length and variable length table A data table containing any varchar, text, and other variable-length fields, which is a

There are many different types of data in Java and data types in SQL, which need to be carefully differentiated, otherwise it is easy to create inexplicable errors in development. Java Data types Hibernate data type Standard SQL

①categories: kind of table corresponding fields:CategoryID: Type ID;CategoryName: type name;Description: type description;Picture: Product Sample ②customercustomerdemo: Customer Type table 1 corresponding fields: ③customerdemographics:

Github: Https://github.com/iccb1013/Sheng.SQLite.PlusSheng.SQLite.Plus is an enhanced component for working directly with the SQLite database using ADO, which operates in a way between the Entity Framework and ADO, and is a highly free and highly

In fact, this is not a file system in the general sense. it does not have disk space, but uses the MySQL daemon to store data. SQL tables and some functions can be implemented through the file system. 1. how to implement it? Let's take a look at the

This is a Linux file system under development. MySQL databases on Linux can be processed as file systems. The development team hopes to get more suggestions. the following article translated from: in fact, this is not a file system in the general

Recently, looking at the company's custom controls, I feel that I should learn these things, which helps to consolidate my basic knowledge, so I tried to restore the company'sCodeTo see if you have such skill. The company's controls have the

The insert, delete, and update statements are the three basic statements of database technology. in general web development, processing is everywhere. if we simply construct these SQL statements by hand, on the one hand, it brings a lot of work to

Tag: Offset while creat returns from the This Super project GREBroadly divided into the following areas: Some query order collation Use SQL statements for special queries Detecting the existence of a table field Database Upgrade

MySQL database design specification 1, the database naming specification uses 26 English letters (case-sensitive) and 0-9 natural number (often do not need) with underscore ' _ ' composition; The name is concise and clear (the length cannot

Core goal: Learn and delete change, write what business are not afraid!I. Understanding the database and its role1. The five basic units of a database1) database server2) database3) Data Sheet4) Data fields5) Data Line2, detailed these five basic

Integrates the automatic generation mechanism of XDoclet ing files in pojo, and provides the functions of saving manual encoding and exporting from the database.The third option of the basic code. XDoclet has been widely used in EJB development. In

Recently made a website with phpcms, need to use the video upload function, but the official video upload function can not be used, ask you how the great God himself to develop the function of uploading video this piece? Tokyu Reply to

@AssertFalse annotated element must be false@AssertTrue annotated element must be false@DecimalMax (value) The annotated element must be a number whose value must be less than or equal to the specified minimum value@DecimalMin (value) The annotated

@AssertFalse annotated element must be false@AssertTrue annotated element must be false@DecimalMax (value) The annotated element must be a number whose value must be less than or equal to the specified minimum value@DecimalMin (value) The annotated

Reprint Songdeyouxiang1. Database naming specificationThe use of 26 letters (case-sensitive) and 0-9 of the natural number (often do not need) with an underscore ' _ ' composition;The name is concise and clear (the length cannot exceed 30 characters)

MySQL database design specification 1, the database naming specification uses 26 English letters (case-sensitive) and 0-9 natural numbers (often do not need) with the underscore ' _ ' composition; the name is concise and clear (the length cannot

mappingPublic "-//hibernate/hibernate mapping DTD 3.0//en" "/http HIBERNATE.SOURCEFORGE.NET/HIBERNATE-MAPPING-3.0.DTD ">mapping package =" Com.myschool.entity "> class name=" admin "table=" admin "lazy=" true "> class="

1 relational databases such as Oracle, database design The first step: to create a PDM as a physical data model through tools such as PowerDesigner (there should be a CDM, but the CDM design process can be omitted in the general development) Step

First, all tables have a primary key field with the name ID. There is a sequence with the same name as the table as the self-increment key.Data-tier Simplification:The data tier is divided into three categories, Configuration Center (CC), Data