Podemos realizar a exclusão de objetos diretamente de duas maneiras:
Instanciar o objeto a partir do ID e usar a função delete()
Instanciar a classe e executar a função delete(ID)
As duas maneiras irão gerar a mesma instrução SQL. A diferença é que a primeira é executada em cima de um objeto e a segunda em uma classe, por isso ela precisa de um parâmetro, neste caso a chave primária do registro (ID). Vamos ver alguns exemplos:Este é o primeiro caso, quando usamos a função delete() em um objeto.
TTransaction::open('exemplos'); $funcionario = new Funcionario(1); $funcionario->delete(); TTransaction::close();
O SQL gerado é:
SELECT * FROM funcionario WHERE (id = 1) DELETE FROM funcionario WHERE (id = '1')
Agora vamos ver o segundo caso.
TTransaction::open('exemplos'); $funcionario = new Funcionario; $funcionario->delete(1); TTransaction::close();
A resposta direta é: depende. Cada caso é um caso, e podemos ver que o primeiro caso realizou uma consulta a mais no BD. Se o objetivo é apenas deletar um objeto, a segunda maneira é mais eficiente, mas existem casos em que será necessário testar algo do objeto para realmente excluir. Portanto, o desenvolvedor deve analisar a melhor maneira de implementar a exclusão de objetos.Aqui falamos apenas da exclusão individual de objetos, mas também existe a exclusão de coleções, que será abordada mais à frente.
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