public SelectColumnWhere(string table, CompareWhere c, string[] columns)
{
m_table = table;
m_compare = c;
m_columnNames = new List <string>();
foreach (string cl in columns)
{
m_columnNames.Add(cl);
}
}
public Table Select(string table, List <string> selects, CompareWhere compared, User user)
{
Table values = null;
List <TableColumn> select = new List <TableColumn>();
Table t = GetTable(table);
List <TableColumn> TableColumns = t.GetList();
TableColumn column;
//we get the select list of columns
foreach (string s in selects)
{
select.Add(t.GetColumn(s));
}
//We create the table which we will return as the select
values = new Table("selectResult", new List <TableColumn>());
//We see if we have any condition
if (compared == null)
{
//we make an iteration for the columns
foreach (TableColumn s in select)
{
//we create a column that we will add in the return list
column = new TableColumn(s.GetName(), s.GetColumnType());
//we get each value we want
foreach (string value in s.GetList())
{
column.AddValue(value);
}
values.AddTableColumn(column);
}
}
else
{
//we have the values where condition is true
List <int> valuesCompared = t.CompareValues(compared);
//we make an iteration for the columns to search those we want
foreach (TableColumn s in select)
{
//we create a column that we will add in the return list
column = new TableColumn(s.GetName(), s.GetColumnType());
//we get each value we want
foreach (string value in s.GetValues(valuesCompared))
{
column.AddValue(value);
}
values.AddTableColumn(column);
}
}
return(values);
}
public List <int> CompareValues(CompareWhere compared)
{
List <int> positions = null;
foreach (TableColumn x in m_list)
{
if (x.GetName() == (compared.GetColumn()))
{
positions = x.GetPositions(compared);
}
}
return(positions);
}
public List <int> GetPositions(CompareWhere compared)
{
List <int> positions = new List <int>();
if (compared.GetComparator().CompareTo("=") == 0)
{
for (int i = 0; i < m_data.Count; i++)
{
if (compared.GetName() == m_data.ElementAt(i))
{
positions.Add(i);
}
}
;
}
else if (compared.GetComparator().CompareTo("<") == 0)
{
for (int i = 0; i < m_data.Count; i++)
{
if (compared.GetName().CompareTo(m_data.ElementAt(i)) == 1)
{
positions.Add(i);
}
}
;
}
else if (compared.GetComparator().CompareTo(">") == 0)
{
for (int i = 0; i < m_data.Count; i++)
{
if (compared.GetName().CompareTo(m_data.ElementAt(i)) == -1)
{
positions.Add(i);
}
}
;
}
return(positions);
}
public string Delete(string table, CompareWhere compared, User user)
{
if (!(user.GetName() == "admin") || !m_security.CheckPrivilege(user, PrivilegeType.Delete, table))
{
return(Messages.SecurityNotSufficientPrivileges);
}
else
{
Table t = GetTable(table);
if (m_tables.Contains(t))
{
if (t.GetList().Contains(t.GetColumn(compared.GetColumn())))
{
List <int> positions = t.CompareValues(compared);
foreach (TableColumn tc in t.GetList())
{
List <string> newList = new List <string>();
for (int i = 0; i < tc.GetList().Count; i++)
{
if (!positions.Contains(i))
{
newList.Add(tc.GetList().ElementAt(i));
}
}
tc.SetList(newList);
}
}
else
{
return(Messages.ColumnDoesNotExist);
}
}
else
{
return(Messages.TableDoesNotExist);
}
return(Messages.TupleDeleteSuccess);
}
}
public string Update(List <string> setAttribute, List <string> value, string table, CompareWhere compared, User user)
{
if (!(user.GetName() == "admin") || !m_security.CheckPrivilege(user, PrivilegeType.Update, table))
{
return(Messages.SecurityNotSufficientPrivileges);
}
else
{
Table t = GetTable(table);
if (m_tables.Contains(t))
{
if (t.GetList().Contains(t.GetColumn(compared.GetColumn())))
{
//we have the values where condition is true
List <int> valuesCompared = t.CompareValues(compared);
//we make an iteration for the columns to search those we want
int count = 0;
foreach (TableColumn s in t.GetList())
{
foreach (string cl in setAttribute)
{
if (t.GetList().Contains(t.GetColumn(cl)))
{
//attribute we have to change
if (s.GetName().CompareTo(cl) == 0)
{
//loop each position we gonna change
foreach (int str in (valuesCompared))
{
//change value in the position we are
s.GetList()[str] = value[count];
}
count++;
}
}
else
{
return(Messages.ColumnDoesNotExist);
}
}
}
}
else
{
return(Messages.ColumnDoesNotExist);
}
}
else
{
return(Messages.TableDoesNotExist);
}
return(Messages.TupleUpdateSuccess);
}
}
