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Add writing, deleting data to SqlDAO

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This commit is contained in:
Lunastra 2021-12-11 15:06:44 -08:00
parent d76a389b9e
commit f8bafc8b6d
2 changed files with 86 additions and 36 deletions
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82
Source Code/TeamHobby.HobbyProjectGenerator.DataAccess/Implementations/SqlDAO.cs
View File

@ -22,47 +22,65 @@ namespace TeamHobby.HobbyProjectGenerator.DataAccess
Console.WriteLine("Connection established");
}
catch {
//conn = null;
//_conn = null;
Console.WriteLine("Error when creating a connection");
throw;
}
}
// Getter and setter for Odbc
public OdbcConnection Connection { get; set; }
// Makre sure to Check for instanceof() before casting to a SQLReader in the controller
// Closing a connection here will cause a problem
// Make sure whoever called this need to close the connection until we can fixed it.
public Object? ReadData(string cmd)
{
try
{
_conn.Open();
OdbcCommand command = new OdbcCommand(cmd, _conn);
OdbcDataReader reader = command.ExecuteReader();
// Execute the command to query the data
//using SqlDataReader sqlReader = command.ExecuteReader();
// while (myReader)
// Print to console
//conn.Close();
//conn.Dispose();
//return sqlReader;
//_conn.Close();
return reader;
}
catch (Exception e)
{
Console.WriteLine("Error when Reading data from databse.");
Console.WriteLine(e.Message);
return null;
}
//finally
//{
// _conn.Close();
//}
}
// The also Identical to update data, maybe only one method is enough
public bool DeleteData(string cmd)
{
throw new NotImplementedException();
try
{
_conn.Open();
OdbcCommand command = new OdbcCommand(cmd, _conn);
command.ExecuteNonQuery();
_conn.Close();
return true;
}
catch (Exception e)
{
Console.WriteLine("Error when deleting data from database!!");
Console.WriteLine(e.Message);
return false;
}
finally
{
_conn.Close();
}
}
@ -71,29 +89,51 @@ namespace TeamHobby.HobbyProjectGenerator.DataAccess
{
try
{
//conn.Open();
_conn.Open();
// Create the SQL command object
//SqlCommand command = new SqlCommand(cmd, conn);
OdbcCommand command = new OdbcCommand(cmd, _conn);
command.ExecuteNonQuery();
// Execute the command to change the rows in a table
//command.ExecuteNonQuery();
_conn.Close();
//conn.Close();
//conn.Dispose();
return true;
}
catch (Exception e)
{
Console.WriteLine("Error when updating data from database!!");
Console.WriteLine(e.Message);
return false;
}
finally
{
_conn.Close();
}
}
// Very similar to UpdataData if not identical
public bool WriteData(string cmd)
{
throw new NotImplementedException();
try
{
_conn.Open();
OdbcCommand command = new OdbcCommand(cmd, _conn);
command.ExecuteNonQuery();
_conn.Close();
return true;
}
catch (Exception e)
{
Console.WriteLine("Error when Writing data from database!!");
Console.WriteLine(e.Message);
return false;
}
finally
{
_conn.Close();
}
}

40
Source Code/main/Controller.cs
View File

@ -43,24 +43,34 @@ namespace TeamHobby.HobbyProjectGenerator.Main
IDataSource<string> datasource = new SqlDAO(dbInfo);
string sqlQuery = "Select * from log;";
Object result = datasource.ReadData(sqlQuery);
Console.WriteLine("type of Result: " + result.GetType());
OdbcDataReader reader = null;
//Object result = datasource.ReadData(sqlQuery);
//Console.WriteLine("type of Result: " + result.GetType());
//OdbcDataReader reader = null;
if (result.GetType() == typeof(OdbcDataReader))
{
reader = (OdbcDataReader)result;
//if (result.GetType() == typeof(OdbcDataReader))
//{
// reader = (OdbcDataReader)result;
}
//}
Console.WriteLine("Reading from the database");
while (reader.Read())
{
Console.WriteLine("Date={0} {1} {2} {3} {4} {5}", reader[0], reader[1], reader[2], reader[3], reader[4], reader[5]);
//Console.WriteLine("Col A: {0} ", reader[0]);
//Console.WriteLine("Column: " + reader.FieldCount);
//Console.WriteLine("Column={1}", reader[1]);
}
//Console.WriteLine("Reading from the database");
//while (reader.Read())
//{
// Console.WriteLine("Date={0} {1} {2} {3} {4} {5}", reader[0], reader[1], reader[2], reader[3], reader[4], reader[5]);
//}
// Inserting Data into the database:
//string sqlWrite = "INSERT into log(lvname, catname, userop, logmessage) values " +
// "('Info', 'View', 'Testing DAL stuffs', 'new DAL method tested');";
//Console.WriteLine("Writing to the database... ");
//datasource.WriteData(sqlWrite);
//Console.WriteLine("Writing completed. ");
string sqlRemove = "DELETE from log where logID = 28;";
Console.WriteLine("Writing to the database... ");
datasource.WriteData(sqlRemove);
Console.WriteLine("Writing completed. ");