public void SaveBook(Book book)
{
DatabasePackage dbPackage = new DatabasePackage(_ConnectionString);
try
{
string sqlQuery = string.Empty;
if (book.ID == 0) // Add a book
{
sqlQuery = "Insert Into Book (Name) Values ('" + book.Name + "')";
}
else // Modify a book
{
sqlQuery = "Update Book Set Name = '" + book.Name + "' Where ID = " + book.ID;
}
dbPackage.CommandText = sqlQuery;
dbPackage.OpenConnection();
dbPackage.BeginTransaction();
if (dbPackage.ExecuteNonQuery() == 0)
{
throw new DataAccessException("Unable to save object.", new Exception());
}
dbPackage.CommitTransaction();
}
catch (DataDuplicityException ex)
{
dbPackage.RollbackTransaction();
if (ex.ErrorMessage.IndexOf("Book_Name_Unique") > 0)
{
throw new DataDuplicityException("Book already exist.", ex);
}
}
catch (DataAccessException ex)
{
dbPackage.RollbackTransaction();
throw new DataLayerException("Unable to save object.", ex);
}
catch (Exception ex)
{
dbPackage.RollbackTransaction();
throw new DataLayerException("Unable to save object.", ex);
}
finally
{
dbPackage.CloseConnection();
}
}
public void SaveUser(User user)
{
DatabasePackage dbPackage = new DatabasePackage(_ConnectionString);
try
{
string sqlQuery = string.Empty;
if (user.ID == 0) // Add a user
{
sqlQuery = "Insert Into User (Name, Password) Values ('" + user.Name + "', '" + user.Password + ")";
}
else // Modify a user
{
sqlQuery = "Update User Set Name = '" + user.Name + "', Password = '******' Where ID = " + user.ID;
}
dbPackage.CommandText = sqlQuery;
dbPackage.OpenConnection();
dbPackage.BeginTransaction();
if (dbPackage.ExecuteNonQuery() == 0)
{
throw new DataAccessException("Unable to save object.", new Exception());
}
dbPackage.CommitTransaction();
}
catch (DataDuplicityException ex)
{
dbPackage.RollbackTransaction();
if (ex.ErrorMessage.IndexOf("User_Name_Unique") > 0)
{
throw new DataDuplicityException("User already exist.", ex);
}
}
catch (DataAccessException ex)
{
dbPackage.RollbackTransaction();
throw new DataLayerException("Unable to save object.", ex);
}
catch (Exception ex)
{
dbPackage.RollbackTransaction();
throw new DataLayerException("Unable to save object.", ex);
}
finally
{
dbPackage.CloseConnection();
}
}
public void DeleteUser(int id)
{
DatabasePackage dbPackage = new DatabasePackage(_ConnectionString);
try
{
dbPackage.CommandText = "Delete From User Where ID = " + id;
dbPackage.OpenConnection();
dbPackage.BeginTransaction();
if (dbPackage.ExecuteNonQuery() == 0)
{
throw new DataAccessException("Unable to save object.", new Exception());
}
dbPackage.CommitTransaction();
}
catch (DataDependencyException ex)
{
dbPackage.RollbackTransaction();
throw new DataDependencyException(ex.ErrorMessage, ex);
}
catch (DataAccessException ex)
{
dbPackage.RollbackTransaction();
throw new DataLayerException("Unable to save object.", ex);
}
catch (Exception ex)
{
dbPackage.RollbackTransaction();
throw new DataLayerException("Unable to save object.", ex);
}
finally
{
dbPackage.CloseConnection();
}
}
public void ReturnBook(int bookID)
{
DatabasePackage dbPackage = new DatabasePackage(_ConnectionString);
try
{
dbPackage.CommandText = "Update Book Set IssueDate = null, MemberID = null Where ID = " + bookID;
dbPackage.OpenConnection();
dbPackage.BeginTransaction();
if (dbPackage.ExecuteNonQuery() == 0)
{
throw new DataAccessException("Unable to save object.", new Exception());
}
dbPackage.CommitTransaction();
}
catch (DataDuplicityException ex)
{
dbPackage.RollbackTransaction();
throw new DataDuplicityException(ex.ErrorMessage, ex);
}
catch (DataAccessException ex)
{
dbPackage.RollbackTransaction();
throw new DataLayerException("Unable to save object.", ex);
}
catch (Exception ex)
{
dbPackage.RollbackTransaction();
throw new DataLayerException("Unable to save object.", ex);
}
finally
{
dbPackage.CloseConnection();
}
}
