private void Generate(object o)
{
if (o is SelectStatement)
{
SelectStatement selectStatement = (SelectStatement)o;
this._writer.Write("SELECT");
for (int i = 0; i < selectStatement.Columns.Count; i++)
{
if (i > 0)
{
this._writer.Write(",");
}
this._writer.Write(" ");
Generate(selectStatement.Columns[i]);
}
this._writer.Write(" ");
this._writer.Write("FROM");
this._writer.Write(" ");
bool first = true;
foreach (object table in selectStatement.From)
{
if (first)
{
first = false;
}
else
{
this._writer.Write(", ");
}
if (table is Alias)
{
Alias alias = (Alias)table;
Generate(alias.Name);
this._writer.Write(" ");
Generate(alias.As);
}
else
{
Generate(table);
}
}
if (selectStatement.Joins != null)
{
for (int i = 0; i < selectStatement.Joins.Count; i++)
{
Generate(selectStatement.Joins[i]);
}
}
if (selectStatement.Where != null)
{
this._writer.Write(" ");
this._writer.Write("WHERE");
this._writer.Write(" ");
Generate(selectStatement.Where);
}
if (selectStatement.GroupBy != null)
{
this._writer.Write(" ");
this._writer.Write("GROUP BY");
for (int i = 0; i < selectStatement.GroupBy.Count; i++)
{
if (i > 0)
{
this._writer.Write(",");
}
this._writer.Write(" ");
Generate(selectStatement.GroupBy[i]);
}
}
if (selectStatement.OrderBy != null)
{
this._writer.Write(" ");
this._writer.Write("ORDER BY");
Generate(selectStatement.OrderBy);
}
}
else if (o is UnionStatement)
{
UnionStatement unionStatement = (UnionStatement)o;
Generate(unionStatement.A);
this._writer.Write(" UNION ");
Generate(unionStatement.B);
}
else if (o is DeleteStatement)
{
DeleteStatement deleteStatement = (DeleteStatement)o;
this._writer.Write("DELETE FROM ");
Generate(deleteStatement.Table);
this._writer.Write(" WHERE ");
Generate(deleteStatement.Where);
}
else if (o is InsertStatement)
{
InsertStatement insertStatement = (InsertStatement)o;
this._writer.Write("INSERT INTO ");
Generate(insertStatement.Table);
this._writer.Write(" (");
bool first = true;
foreach (Identifier identifier in insertStatement.Columns)
{
if (first)
{
first = false;
}
else
{
this._writer.Write(", ");
}
Generate(identifier);
}
this._writer.Write(") VALUES (");
first = true;
foreach (object value in insertStatement.Values)
{
if (first)
{
first = false;
}
else
{
this._writer.Write(", ");
}
Generate(value);
}
this._writer.Write(")");
}
else if (o is ReplaceStatement)
{
ReplaceStatement replaceStatement = (ReplaceStatement)o;
this._writer.Write("REPLACE INTO ");
Generate(replaceStatement.Table);
this._writer.Write(" (");
bool first = true;
foreach (Identifier identifier in replaceStatement.Columns)
{
if (first)
{
first = false;
}
else
{
this._writer.Write(", ");
}
Generate(identifier);
}
this._writer.Write(") VALUES (");
first = true;
foreach (object value in replaceStatement.Values)
{
if (first)
{
first = false;
}
else
{
this._writer.Write(", ");
}
Generate(value);
}
this._writer.Write(")");
}
else if (o is UpdateStatement)
{
UpdateStatement updateStatement = (UpdateStatement)o;
this._writer.Write("UPDATE ");
Generate(updateStatement.Table);
this._writer.Write(" SET ");
bool first = true;
foreach (Predicate predicate in updateStatement.SetList)
{
if (first)
{
first = false;
}
else
{
this._writer.Write(", ");
}
Generate(predicate);
}
if (updateStatement.Where != null)
{
this._writer.Write(" WHERE ");
Generate(updateStatement.Where);
}
}
else if (o is InnerJoin)
{
InnerJoin innerJoin = (InnerJoin)o;
this._writer.Write(" ");
this._writer.Write("INNER JOIN");
this._writer.Write(" ");
if (innerJoin.Table is Alias)
{
Alias alias = (Alias)innerJoin.Table;
Generate(alias.Name);
this._writer.Write(" ");
Generate(alias.As);
}
else
{
Generate(innerJoin.Table);
}
this._writer.Write(" ");
this._writer.Write("ON");
this._writer.Write(" ");
Generate(innerJoin.A);
this._writer.Write(" ");
this._writer.Write(innerJoin.Operator);
this._writer.Write(" ");
Generate(innerJoin.B);
}
else if (o is LeftOuterJoin)
{
LeftOuterJoin leftOuterJoin = (LeftOuterJoin)o;
this._writer.Write(" ");
this._writer.Write("LEFT OUTER JOIN");
this._writer.Write(" ");
if (leftOuterJoin.Table is Alias)
{
Alias alias = (Alias)leftOuterJoin.Table;
Generate(alias.Name);
this._writer.Write(" ");
Generate(alias.As);
}
else
{
Generate(leftOuterJoin.Table);
}
this._writer.Write(" ");
this._writer.Write("ON");
this._writer.Write(" ");
Generate(leftOuterJoin.A);
this._writer.Write(" ");
this._writer.Write(leftOuterJoin.Operator);
this._writer.Write(" ");
Generate(leftOuterJoin.B);
}
else if (o is LeftOuterJoin)
{
RightOuterJoin rightOuterJoin = (RightOuterJoin)o;
this._writer.Write(" ");
this._writer.Write("RIGHT OUTER JOIN");
this._writer.Write(" ");
if (rightOuterJoin.Table is Alias)
{
Alias alias = (Alias)rightOuterJoin.Table;
Generate(alias.Name);
this._writer.Write(" ");
Generate(alias.As);
}
else
{
Generate(rightOuterJoin.Table);
}
this._writer.Write(" ");
this._writer.Write("ON");
this._writer.Write(" ");
Generate(rightOuterJoin.A);
this._writer.Write(" ");
this._writer.Write(rightOuterJoin.Operator);
this._writer.Write(" ");
Generate(rightOuterJoin.B);
}
else if (o is Predicate)
{
Predicate predicate = (Predicate)o;
Generate(predicate.A);
this._writer.Write(" ");
this._writer.Write(predicate.Operator);
this._writer.Write(" ");
Generate(predicate.B);
}
else if (o is List <Sort> )
{
List <Sort> sorts = (List <Sort>)o;
for (int i = 0; i < sorts.Count; i++)
{
if (i > 0)
{
this._writer.Write(",");
}
this._writer.Write(" ");
Generate(sorts[i].Column);
if (!sorts[i].Asc)
{
this._writer.Write(" DESC");
}
}
}
else if (o is Identifier)
{
Identifier identifier = (Identifier)o;
this._writer.Write(identifier.Value);
}
else if (o is Function)
{
Function function = (Function)o;
Generate(function.Name);
this._writer.Write("(");
for (int i = 0; i < function.Operands.Count; i++)
{
if (i > 0)
{
this._writer.Write(",");
}
this._writer.Write(" ");
Generate(function.Operands[i]);
}
this._writer.Write(")");
}
else if (o is Alias)
{
Alias alias = (Alias)o;
Generate(alias.Name);
this._writer.Write(" AS ");
Generate(alias.As);
}
else if (o is System.DateTime)
{
System.DateTime dateTime = (System.DateTime)o;
this._writer.Write("#");
if (dateTime.TimeOfDay.Ticks == 0)
{
this._writer.Write(dateTime.ToShortDateString());
}
else
{
this._writer.Write(dateTime.ToString());
}
this._writer.Write("#");
}
else if (o is string)
{
this._writer.Write("'");
this._writer.Write(o);
this._writer.Write("'");
}
else if (o is int)
{
this._writer.Write(o);
}
else if (o is decimal)
{
this._writer.Write(o);
}
else
{
throw new System.Exception("Unknown expression: " + o.GetType().FullName);
}
}
private static Iterators.Iterator CreateIterator(Database database, UnionStatement union)
{
return(new Iterators.UnionIterator(CreateIterator(database, union.A), CreateIterator(database, union.B)));
}