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Instalação e configuração do DbVisualizer no Linux

Com a crescente adoção do uso de Linux, algumas pessoas têm me perguntado qual software de acesso a banco de dados eu uso no Linux. Eu utilizo um software que já conheço desde os meus tempos de desenvolvimento para PDAs, quando o DbVisualizer era a única forma conhecida de se acessar as bases de dados dos dispositivos móveis.O software pode ser baixado a partir daqui, após preenchimento de um pequeno cadastro. Para que usa distribuições baseadas em pacotes rpm, a opção do download do rpm é mais conveniente, e a instalação pode ser feita com o comando rpm –install nome_arquivo_dbvis.rpm. Para Linux em geral, pode ser utilizado o instalador em formato .sh

Baixando o instalador .sh, basta copiar o arquivo para um diretório qualquer de sua preferência e executá-lo como ./dbvis_linux_6_0_2.sh para iniciar o processo de instalação.

Caso o instalador não se inicie normalmente, verifique se o arquivo .sh está com permissão de execução (caso não esteja, faça chmod a+x dbvis_linux_6_0_2.sh) e se você possui o Java no PATH do seu usuário. Para verificar se você possui o Java e a versão do mesmo, use o comando: java -version. O recomendado é ter uma versão de Java da Sun e que seja a partir do 1.5. Muitas distribuições Linux instalam uma versão do Java da GNU, mas não gosto e não recomendo esta versão. Coloque o diretório do Java da Sun no começo do PATH do usuário (se alguém não souber como, eu explico posteriormente).

O processo de instalação em si é bastante simples. Você precisa apenas aceitar os termos de uso do software e escolher o diretório de instalação. No resto, aceite as opções padrão apresentadas e Next -> Next -> Next :) O processo de instalação cria um atalho no Desktop.

Com a aplicação instalada, vou mostrar agora como configurar a aplicação para conseguir acessar o Oracle. O driver jdbc do Oracle não vem incluído na instalação do DbVisualizer. Para conectar ao Oracle é necessário carregar o driver. Para isto, entre na opção Tools -> Driver Manager, conforme abaixo:

Carregar driver jdbc

Nesta tela que abrir, selecione no menu esquerdo a opção Oracle Thin e então na janela que se abrirá, você terá que selecionar o jar do driver jdbc do Oracle (ojdbc14.jar ou classes12.jar), conforme abaixo:

Escolher jar do driver jdbc

Se o jar foi corretamente carregado, a opção do Oracle Thin aparecerá verde. Tendo feito isso é hora de criar a conexão. Vá para a tela principal da aplicação, e no menu esquerdo, clique com o botão direito na opção Connections e então escolha Create Database Connection. Escolha por não usar o wizard, e você chegará na tela a seguir:

Nova conexão

Preencha os campos da seguinte forma:

  • Alias: nome que você quer dar à conexão
  • Database Type: Oracle
  • Driver (JDBC): Oracle Thin
  • Database URL: url jdbc de acesso, conforme será explicado abaixo.
  • Userid: usuário de banco
  • Password: senha do usuário

A URL jdbc varia de um servidor para o outro. No caso do Oracle, o formato é conforme publicado neste outro post. Como referência para o Oracle, se você tiver acesso a um tnsnames que acesse o servidor que você precisa, no tnsnames o formato da declaração é: nome_alias = string_conexao

Para criar uma URL jdbc do Oracle a partir de uma conexão declarada no tnsnames, você deve fazer jdbc:oracle:thin:@string_conexao

Pronto, após preencher este formulário de configuração, você está pronto para conectar-se ao Oracle! Caso alguma coisa não tenha ficado clara, por favor me indiquem para eu explicar melhor

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