Computer security

Computer security is a branch of computer technology known as information security as applied to computers and networks. The objective of computer security includes protection of information and property from theft, corruption, or natural disaster, while allowing the information and property to remain accessible and productive to its intended users. The term computer system security means the collective processes and mechanisms by which sensitive and valuable information and services are protected from publication, tampering or collapse by unauthorized activities or untrustworthy individuals and unplanned events respectively. The strategies and methodologies of computer security often differ from most other computer technologies because of its somewhat elusive objective of preventing unwanted computer behavior instead of enabling wanted computer behavior.

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SQL

What is SQL?

• SQL stands for Structured Query Language
• SQL lets you access and manipulate databases
• SQL is an ANSI (American National Standards Institute) standard

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What Can SQL do?

• SQL can execute queries against a database
• SQL can retrieve data from a database
• SQL can insert records in a database
• SQL can update records in a database
• SQL can delete records from a database
• SQL can create new databases
• SQL can create new tables in a database
• SQL can create stored procedures in a database
• SQL can create views in a database
• SQL can set permissions on tables, procedures, and views

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SQL is a Standard - BUT....

Although SQL is an ANSI (American National Standards Institute) standard, there are many different versions of the SQL language.
However, to be compliant with the ANSI standard, they all support at least the major commands (such as SELECT, UPDATE, DELETE, INSERT, WHERE) in a similar manner.
Note: Most of the SQL database programs also have their own proprietary extensions in addition to the SQL standard!

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Using SQL in Your Web Site

To build a web site that shows some data from a database, you will need the following:

• An RDBMS database program (i.e. MS Access, SQL Server, MySQL)
• A server-side scripting language, like PHP or ASP
• SQL
• HTML / CSS

database language

database language A generic term referring to a class of languages used for defining and accessing databases. A particular database language will be associated with a particular database management system. There are two distinct classes of database language: those that do not provide complete programming facilities and are designed to be used in association with some general-purpose programming language (the host language), and those that do provide complete programming facilities (database programming languages). Some products adopting the former approach seek to minimize host-language programming by the provision of fourth-generation language (4GL) facilities.

A database language must provide for both logical-schema specification and modification (data description) and for retrieval and update (data manipulation). In some cases, particularly products derived from the CODASYL network database standard, these aspects are treated distinctly as the data description language (DDL) and the data manipulation language (DML). Modification to the storage schema is also generally separately provided.


The .NET Framework

The .NET Framework is:

• Common Language Runtime – provides an abstraction layer over the operating system
• Base Class Libraries – pre-built code for common low-level programming tasks
• Development frameworks and technologies – reusable, customizable solutions for larger programming tasks

The .NET Framework allows you to:

Apply common skills across a variety of devices, application types, and programming tasks

Integrate with other tools and technologies to build the right solution with less work

Build compelling applications faster



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