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Oracle 12c. Programación Sql*plus, SQL Y Pl/SQL

Oracle 12c. Programación Sql*plus, SQL Y Pl/SQL

          
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About the Book

La base de datos Oracle 12c presenta capacidades de programación de alto nivel que permiten el uso versátil de la información y facilitan el trabajo con los datos desde los entornos sencillos, pasando por los entornos cliente-servidor hasta llegar a los entornos distribuidos. El libro comienza en un nivel muy básico con la idea de introducir al lector paso a paso en la programación de Oracle. Se comenzará mostrando la introducción de código en el entorno SQL*Plus y el desarrollo amplio del modelo entidad-relación a través de Oracle SQL que constituye el pilar básico de la programación en las bases de datos relacionales. Así mismo, se trata de forma exhaustiva el lenguaje de programación procedimental PL/SQL de Oracle, que amplía el lenguaje estándar SQL. PL/SQL (Procedural Lenguaje/SQL) es un lenguaje de programación que se utiliza para acceder y trabajar con bases de datos Oracle desde distintos entornos. PL/SQL amplía la funcionalidad del lenguaje SQL añadiendo estructuras típicas de los lenguajes procedimentales, como las variables y los tipos, las estructuras de control (bucles, órdenes IF-THEN-ELSE, etc.), los procedimientos y las funciones, los tipos de objetos y los métodos, y otras estructuras clásicas en los lenguajes de programación procedimentales. Resulta así un lenguaje robusto y potente que combina la flexibilidad de SQL con la potencia y configurabilidad de las construcciones procedimentales. En el trabajo con aplicaciones de bases de datos es típica la estructura cliente-servidor formada por un servidor de bases de datos que recibe peticiones de información de programas residentes en máquinas clientes conectadas por la red con el servidor. Las solicitudes de información suelen llevarse a cabo en lenguaje SQL, lo que da lugar a múltiples comunicaciones por la red (una por cada petición SQL). Para racionalizar este tráfico de información se utiliza PL/SQL, que empaqueta varias órdenes SQL en un único bloque PL/SQL, que se envía al servidor como una unidad. De esta forma se disminuye el tráfico en la red y aumenta la velocidad de la aplicación. Si el cliente y el servidor están en la misma máquina, el rendimiento crece y el empaquetar las órdenes SQL en bloques PL/SQL sigue produciendo un programa más simple que realiza menos llamadas a la base de datos y que es rentable aunque no exista red. Por lo tanto la unidad básica en PL/SQL es el bloque, estando formados los programas por combinaciones de bloques que incluso pueden estar anidados. De esta forma se separan las tareas unas de otras porque cada bloque realiza una unidad lógica de trabajo en el programa. Entre PL/SQL y la base de datos se transmite la información mediante variables, que no son más que zonas de almacenamiento que pueden ser leídas y escritas por el programa. Los bloques suelen tener una sección llamada sección declarativa en la que por regla general se declaran las variables. Cada variable tiene asociado un tipo que define la clase de información que se puede almacenar en ella. Los tipos de las variables pueden ser similares a los de las columnas de una base de datos, aunque PL/SQL también admite como tipos definidos por el usuario a las tablas y a las columnas. También es posible utilizar tipos de objetos que tienen métodos y atributos, que pueden ser almacenados en una base de datos, y que elevan al lenguaje PL/SQL a la categoría de lenguaje de programación orientado al objeto.


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Product Details
  • ISBN-13: 9781494492694
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 229 mm
  • No of Pages: 362
  • Series Title: Spanish
  • Weight: 485 gr
  • ISBN-10: 1494492695
  • Publisher Date: 15 Dec 2013
  • Binding: Paperback
  • Language: Spanish
  • Returnable: N
  • Spine Width: 19 mm
  • Width: 152 mm


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