private static void Delete(string connectionString, string serverType, DatabaseDialog databaseDialog, int whichDatabase, TableDialog tableDialog, int whichTable, TableOptions tableOptions, DataTable columns, int whichColumn)
{
Console.Clear();
//Ask user for confirmation to delete
Console.WriteLine("Are you sure, you want to delete this column? [Type Y for Yes, or N for No, N is default]");
string input = Console.ReadLine();
if (input == "Y")
{
}
else if (input == "N" || input == "")
{
//If user passes N or blank space, return to table options
tableOptions.Start(databaseDialog, whichDatabase, tableDialog, whichTable);
}
else
{
//If user passes incorrect input, ask again
ColumnDeleter.Delete(connectionString, serverType, databaseDialog, whichDatabase, tableDialog, whichTable, tableOptions, columns, whichColumn);
}
if (serverType == "MSSQL Server")
{
//If serverType is MSSQL Server, delete column using SqlClient
SqlConnection connection = new SqlConnection(connectionString + $"Initial Catalog = {databaseDialog.options[whichDatabase]}");
SqlCommand command = new SqlCommand($"Alter table {tableDialog.options[whichTable]} drop column {columns.Rows[whichColumn].ItemArray[0]};", connection);
connection.Open();
command.ExecuteNonQuery();
command.Dispose();
connection.Close();
connection.Dispose();
}
else if (serverType == "PostgreSQL")
{
//If serverType is PostgreSQL, delete column using Npgsql
NpgsqlConnection connection = new NpgsqlConnection(connectionString + $"Database = {databaseDialog.options[whichDatabase]}");
NpgsqlCommand command = new NpgsqlCommand($"Alter table {tableDialog.options[whichTable]} drop column {columns.Rows[whichColumn].ItemArray[0]};", connection);
connection.Open();
command.ExecuteNonQuery();
command.Dispose();
connection.Close();
connection.Dispose();
}
}
public static void SelectColumn(string connectionString, string serverType, DatabaseDialog databaseDialog, int whichDatabase, TableDialog tableDialog, int whichTable, TableOptions tableOptions)
{
DataTable dataTable = new DataTable();
DataTable columns = new DataTable();
if (serverType == "MSSQL Server")
{
//If server type is MSSQL Server fill one DataTable with all table contents and second with column names and data types using SqlClient
SqlConnection connection = new SqlConnection(connectionString + $"Initial Catalog={databaseDialog.options[whichDatabase]}");
SqlDataAdapter adapter = new SqlDataAdapter($"SELECT * FROM {tableDialog.options[whichTable]}", connection);
connection.Open();
adapter.Fill(dataTable);
SqlDataAdapter columnNames = new SqlDataAdapter($"Select column_name, data_type from information_schema.columns where table_name = '{tableDialog.options[whichTable]}'", connection);
columnNames.Fill(columns);
connection.Close();
}
else if (serverType == "PostgreSQL")
{
//If server type is PostgreSQL fill one DataTable with all table contents and second with column names and data types using Npgsql
NpgsqlConnection connection = new NpgsqlConnection(connectionString + $"Database={databaseDialog.options[whichDatabase]}");
NpgsqlDataAdapter adapter = new NpgsqlDataAdapter($"SELECT * FROM {tableDialog.options[whichTable]}", connection);
connection.Open();
adapter.Fill(dataTable);
NpgsqlDataAdapter columnNames = new NpgsqlDataAdapter($"Select column_name, data_type from information_schema.columns where table_name = '{tableDialog.options[whichTable]}'", connection);
columnNames.Fill(columns);
connection.Close();
}
//Set selected columns at 0
int whichColumn = 0;
bool inside = true;
//Print table with highlighted column 0
TablePrinter.PrintColumnSelector(dataTable, columns, whichColumn);
while (inside)
{
//Wait for user input
if (Console.KeyAvailable)
{
ConsoleKeyInfo input = Console.ReadKey();
switch (input.Key)
{
case ConsoleKey.LeftArrow:
//If user input is Left Arrow, and selected column is bigger than 0
//decrease whichColumn by 1 and print table with highlighted current column
if (whichColumn > 0)
{
whichColumn--;
}
TablePrinter.PrintColumnSelector(dataTable, columns, whichColumn);
break;
case ConsoleKey.RightArrow:
//If user input is Right Arrow, and selected column is smaller than column amount - 1
//increase whichColumn by 1 and print table with highlighted current column
if (whichColumn < dataTable.Rows[0].ItemArray.Length - 1)
{
whichColumn++;
}
TablePrinter.PrintColumnSelector(dataTable, columns, whichColumn);
break;
case ConsoleKey.Escape:
//If user input is Escape return to tableOptions
Console.Clear();
Console.WriteLine("Returning...");
tableOptions.Start(databaseDialog, whichDatabase, tableDialog, whichTable);
break;
case ConsoleKey.Enter:
//If user input is Enter leave loop
inside = false;
break;
}
}
}
//Start deleting currently selected column
ColumnDeleter.Delete(connectionString, serverType, databaseDialog, whichDatabase, tableDialog, whichTable, tableOptions, columns, whichColumn);
//Return to column selecting
ColumnDeleter.SelectColumn(connectionString, serverType, databaseDialog, whichDatabase, tableDialog, whichTable, tableOptions);
}
