Revert "classe_conexao 100%"

This reverts commit a3a472e22c121c3c0d9b753c817fb21960e6227e.
Revert "Revert "classe_conexao 100%""

This reverts commit 4f6edd216b164e6dea9c4407fcbd22fa0675f058.
Revert "Revert "Revert "classe_conexao 100%"""

This reverts commit 696832817257e3b3b9f1e90229d7054ef1b7a8b9.