public static Statement CreateStatement(Select select, IEntityMapping mapping, IEnumerable <string> projectionOverride = null, bool noLock = false)
{
var sql = new SqlWriter();
var parameters = new Dictionary <string, object>();
var projection = projectionOverride ?? BuildProjection(select, mapping, parameters);
var whereClause = BuildWhereClause(select, mapping, parameters);
var orderByClause = select.HasOrderBy ? BuildOrderBy(select.OrderBy, mapping, parameters) : null;
Action <SqlWriter> writeProjection = x => x.Do(projection != null, y => y.FieldList(z => z.Comma.Flush(), projection), y => y.Wildcard.Flush());
if (select.Any)
{
sql.Select.Cast().Trim().OpenBlock.Trim().Case.When.Exists.OpenBlock.Trim();
}
if (select.From.IsTable || select.HasConditions)
{
sql.Select.Flush();
if (select.First || select.FirstOrDefault)
{
sql.Top(1);
}
else if (select.Single)
{
sql.Top(2);
}
else if (select.HasTop && !select.HasStart)
{
sql.Do(select.TopType == Select.TopValueType.Count, x => x.Top(select.Top), x => x.TopPercent(select.Top));
}
if (select.Count)
{
sql.CountWildcard.Flush();
}
else
{
sql.Do(writeProjection);
}
sql.From.Flush();
if (select.HasStart)
{
sql.OpenBlock.Trim().Select.Do(writeProjection).Trim().Comma.
RowNumber().Over.OpenBlock.Trim().OrderBy.
Do(select.HasOrderBy, x => x.Write(orderByClause), x => x.Do(projection != null, writeProjection, y => y.QuotedName(mapping.Key.GetColumnName()))).Trim().
CloseBlock.As.RowNumberAlias.From.Flush();
}
if (select.HasDuplicates)
{
var duplicateProjection = BuildProjection(select.Duplicates.Distinct, mapping, parameters);
sql.OpenBlock.Trim().Select.Do(writeProjection).Trim().Comma.
RowNumber().Over.OpenBlock.Trim().Partition.By.Write(duplicateProjection).OrderBy.Write(BuildOrderBy(select.Duplicates.OrderBy, mapping, parameters)).
Trim().CloseBlock.As.PartitionAlias.From.Flush();
}
else if (select.HasDistinct)
{
var distinctProjection = BuildProjections(select.Distinct.Select(x => x.Projection), mapping, parameters);
sql.OpenBlock.Trim().Select.Do(writeProjection).Trim().Comma.
RowNumber().Over.OpenBlock.Trim().Partition.By.ExpressionList(z => z.Comma.Flush(), distinctProjection).OrderBy.
Write(BuildOrderBy(select.Distinct.Any(x => x.HasOrder) ? select.Distinct.Where(x => x.HasOrder).Select(x => x.Order) :
select.Distinct.Select(x => new OrderBy {
Type = OrderBy.SourceType.Projection,
Projection = x.Projection,
Order = Order.Ascending
}), mapping, parameters)).Trim().
CloseBlock.As.PartitionAlias.From.Flush();
}
}
switch (select.From.Type)
{
case Data.DataType.Table:
sql.QuotedName(select.From.Table.Name).Write(select.From.Alias);
if (noLock)
{
sql.With(x => x.NoLock.Flush());
}
break;
case Data.DataType.Query:
var first = true;
if (select.HasConditions)
{
sql.OpenBlock.Trim().Flush();
}
foreach (var subQuery in select.From.Queries.Select(x => CreateStatement(x, mapping, projection, noLock)))
{
sql.Do(!first, x => x.Union.Flush()).Write(subQuery.Text).Flush();
parameters.AddRange(subQuery.Parameters);
first = false;
}
if (select.HasConditions)
{
sql.Trim().CloseBlock.As.Write(select.From.Alias).Flush();
}
break;
}
if (select.From.IsTable || select.HasConditions)
{
if (select.HasWhere || select.HasSetOperations)
{
sql.Where.Write(whereClause).Flush();
}
if (select.Randomize)
{
sql.OrderBy.NewId();
}
// The reason why we dont do an order by if there is a start is because the order by is
// already specified in the row number definition. So we dont need to specify it again.
else if (select.HasOrderBy && !select.HasStart && !select.HasDistinct)
{
sql.OrderBy.Write(orderByClause);
}
if (select.HasDuplicates)
{
sql.Trim().CloseBlock.As.Write(select.From.Alias).Where.PartitionAlias.GreaterThan.Value(1, SqlDbType.Int).Flush();
}
else if (select.HasDistinct)
{
sql.Trim().CloseBlock.As.Write(select.From.Alias).Where.PartitionAlias.Equal.Value(1, SqlDbType.Int).Flush();
}
if (select.HasStart)
{
sql.Trim().CloseBlock.As.Write(select.From.Alias).Where.RowNumberAlias.Flush();
if (select.HasTop && select.HasStart)
{
sql.Between(select.Start, select.Start + (select.Top - 1));
}
else
{
sql.GreaterThanOrEqual.Value(select.Start, SqlDbType.Int);
}
}
}
if (select.Any)
{
sql.Trim().CloseBlock.Then.Value(1, SqlDbType.Bit).Else.Value(0, SqlDbType.Bit).End.As.Write(DataTypes.Bit.SqlName).Trim().CloseBlock.Flush();
}
return(new Statement(sql.ToString(), Statement.StatementType.Text, GetResultType(select), parameters));
}
