Programming Languages

Visual Basic Programming

Programming in Visual Basic is an agile and simple way to create applications for Microsoft Windows.
The programming language in Visual Basic provides all the necessary tools for rapid application development.

We could define programming in Visual Basic as the method used to develop graphical user interface.
With programming in Visual Basic you can develop almost any program you can imagine.

In addition to ActiveX technology, Visual Basic provides a tool for creating unlimited applications in the network.

Programming in Visual Basic allows to quickly build Windows applications. It is not necessary to know other programming languages to program in Visual Basic podersaber.

Programming in Visual Basic is a simple way to create applications besides language offers a number of tools to simplify this work, including projects, templates, forms, objects, custom controls, add-ins and a database manager.

Version 6.0 of Visual Basic programming is specially designed for the Internet. Using executable ActiveX controls operate like Visual Basic application is independent and through which they can access Internet Explorer.

Key features of programming in Visual Basic 6.0:

-The ability to access data from the database, client / server and scalable applications such as Microsoft SQL Server.
-ActiveX Technology
-ActiveX Controls
-Internet programming, web servers, DHTML, etc. ..
-Creating. Exe files, allowing circulated plication with great freedom.

Creado por Geraldine Avila

Database management systems

Database management systems

Main article: Database management system

A database management system (DBMS) consists of software that organizes the storage of data. A DBMS controls the creation, maintenance, and use of the database storage structures of social organizations and of their users. It allows organizations to place control of organization wide database development in the hands of Database Administrators (DBAs) and other specialists. In large systems, a DBMS allows users and other softwares to store and retrieve data in a structured way.

Database management systems are usually categorized according to the database model that they support, such as the network, relational or object model. The model tends to determine the query languages that are available to access the database. One commonly used query language for the relational database is SQL, although SQL syntax and function can vary from one DBMS to another. A common query language for the object database is OQL, although not all vendors of object databases implement this, majority of them do implement this method. A great deal of the internal engineering of a DBMS is independent of the data model, and is concerned with managing factors such as performance, concurrency, integrity, and recovery from hardware failures. In these areas there are large differences between the products.

A relational database management system (RDBMS) implements features of the relational model. In this context, Date's "Information Principle" states: "the entire information content of the database is represented in one and only one way. Namely as explicit values in column positions (attributes) and rows in relations (tuples). Therefore, there are no explicit pointers between related tables." This contrasts with the object database management system (ODBMS), which does store explicit pointers between related types.

STRUCTURED PROGRAMMING

STRUCTURED PROGRAMMING.

Structured Programming: A technique in which the structure of a program the writing of its parts is made as clearly as possible through the use of three logical structures of control:

Sequence; a sequence of two or more simple operations.

Selection: Conditional Split one or more transactions.

Interaction: Repeating an operation while a condition is met.

These three types of logical structures of control can be combined to produce programs that handle all information processing task.

A structured program cosists of segments, which may be constituted by a few instructions or a page or more coding. Each segment has only one entrance ande one exit these segments, assuming you do not have infinite loops and have never run instructions are called programs themselves. When several programs themselves are combined using the three basic control structures mentioned above, the outcome is also own program.

Structured programming is based on the structure theorem, which states that any proper program (a program with one entrance and one exit only) is equivalent to a program that contains only the logical structures mentioned above.

An important feature is a structured program that can be read sequentially, from beginning to end without losing the continuity of the task that the program meets opposite of what occurs with other programming styles.

This is important because it is much easier to understand fully the work they perform a particular funtion, if all instructions that affect is action are physically close and enclosed by a block. The ease of reading, from beginning to end, is a consequence of using only three control structures and to eliminate diversion instruction control flow, except in very special circumstances such as simulation of a logical structure in language control programming that does not possess.

Creado por Geraldine Avila