public List <User> GetUsers()
{
DatabasePackage dbPackage = new DatabasePackage(_ConnectionString);
List <User> users = new List <User>();
SqlDataReader reader = null;
try
{
dbPackage.CommandText = "Select ID, Name, Password From User Order By Name";
reader = dbPackage.GetReader();
while (reader.Read())
{
User user = new User();
user.ID = dbPackage.FieldToInt(reader["ID"]);
user.Name = dbPackage.FieldToString(reader["Name"]);
user.Password = dbPackage.FieldToString(reader["Password"]);
users.Add(user);
}
}
catch (DataAccessException ex)
{
throw new DataLayerException("Collection could not populated.", ex);
}
catch (Exception ex)
{
throw new DataLayerException("Collection could not populated.", ex);
}
finally
{
if (reader != null)
{
reader.Close();
}
dbPackage.CloseConnection();
}
return(users);
}
public User GeUserByID(int id)
{
DatabasePackage dbPackage = new DatabasePackage(_ConnectionString);
SqlDataReader reader = null;
try
{
dbPackage.CommandText = "Select ID, Name, Password From User Where ID = " + id;
reader = dbPackage.GetReader();
reader.Read();
User user = new User
{
ID = id,
Name = dbPackage.FieldToString(reader["Name"]),
Password = dbPackage.FieldToString(reader["Password"])
};
return(user);
}
catch (DataAccessException ex)
{
throw new DataLayerException("Unable to retrieve data.", ex);
}
catch (Exception ex)
{
throw new DataLayerException("Unable to retrieve data.", ex);
}
finally
{
if (reader != null)
{
reader.Close();
}
}
}
public List <Book> GetIssuedBooks()
{
DatabasePackage dbPackage = new DatabasePackage(_ConnectionString);
List <Book> books = new List <Book>();
SqlDataReader reader = null;
try
{
dbPackage.CommandText = "Select ID, Name, IssueDate, MemberID From Book Where MemberID is Not Null Order By Name";
reader = dbPackage.GetReader();
while (reader.Read())
{
Book book = new Book();
book.ID = dbPackage.FieldToInt(reader["ID"]);
book.Name = dbPackage.FieldToString(reader["Name"]);
book.IssueDate = dbPackage.FieldToDateTime(reader["IssueDate"]);
book.MemberID = dbPackage.FieldToInt(reader["MemberID"]);
books.Add(book);
}
}
catch (DataAccessException ex)
{
throw new DataLayerException("Collection could not populated.", ex);
}
catch (Exception ex)
{
throw new DataLayerException("Collection could not populated.", ex);
}
finally
{
if (reader != null)
{
reader.Close();
}
dbPackage.CloseConnection();
}
return(books);
}
public List <Member> GetNoBookIssuedMembers()
{
DatabasePackage dbPackage = new DatabasePackage(_ConnectionString);
List <Member> members = new List <Member>();
SqlDataReader reader = null;
try
{
dbPackage.CommandText = "Select ID, Name From Member Where ID Not In (Select MemberID From Book Where MemberID Is Null) Order By Name";
reader = dbPackage.GetReader();
while (reader.Read())
{
Member member = new Member();
member.ID = dbPackage.FieldToInt(reader["ID"]);
member.Name = dbPackage.FieldToString(reader["Name"]);
members.Add(member);
}
}
catch (DataAccessException ex)
{
throw new DataLayerException("Collection could not populated.", ex);
}
catch (Exception ex)
{
throw new DataLayerException("Collection could not populated.", ex);
}
finally
{
if (reader != null)
{
reader.Close();
}
dbPackage.CloseConnection();
}
return(members);
}
public Book GetBookByID(int id)
{
DatabasePackage dbPackage = new DatabasePackage(_ConnectionString);
SqlDataReader reader = null;
try
{
dbPackage.CommandText = "Select ID, Name, IssueDate, MemberID From Book Where ID = " + id;
reader = dbPackage.GetReader();
reader.Read();
Book book = new Book
{
ID = id,
Name = dbPackage.FieldToString(reader["Name"]),
IssueDate = dbPackage.FieldToDateTime(reader["IssueDate"]),
MemberID = dbPackage.FieldToInt(reader["MemberID"])
};
return(book);
}
catch (DataAccessException ex)
{
throw new DataLayerException("Unable to retrieve data.", ex);
}
catch (Exception ex)
{
throw new DataLayerException("Unable to retrieve data.", ex);
}
finally
{
if (reader != null)
{
reader.Close();
}
}
}