Resumão de PL/SQL, parte 1: introdução

Esta série de artigos é um resumão dos capítulos do livro Oracle PL/SQL Programming, 6ª edição, de Steven Feuerstein e Bill Pribyl, que estou estudando. O objetivo deste resumão é manter aqui um lembrete para as coisas mais importantes que aprendi e que podem ser úteis no futuro.

PL/SQL significa “Procedural Language EXTENSIONS to Structured Query Language”, ou seja, é uma EXTENSÃO procedural à linguagem SQL do banco de dados Oracle.

Se você trabalha com, ou programa qualquer coisa para,  o Oracle Database terá que, em algum momento, escrever código em PL/SQL. Sendo uma extensão procedural à SQL, a PL/SQL agrega várias coisas ao SQL do Oracle:

  • Condicionais (if, then, else, case, etc.)
  • Loops (for, while, etc.)
  • Funçṍes, procedures
  • Tratamento de exceptions e erros
  • Variáveis, arrays, datatypes, etc.
  • Várias packages built-in com funcionalidades excepcionais

A PL/SQL não é executável, ou seja, para rodar o código deve estar compilado dentro do Oracle Database ou de alguma ferramenta cliente capaz de executar código PL/SQL, como o SQL*Plus ou o Oracle Forms.

A cada release do Oracle Database uma nova versão da PL/SQL é lançada, com várias inovações para os programadores. Hoje, falar que “isso não pode ser feito com PL/SQL” é mera desculpa.

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