private SimpleTableSegment GetTableSegment(IProjectionSegment projection)
{
var owner = GetTableOwner(projection);
if (owner != null && IsTable(owner, GetSqlCommand().GetSimpleTableSegments()))
{
return(new SimpleTableSegment(owner.GetStartIndex(), owner.GetStopIndex(), owner.GetIdentifier()));
}
return(null);
}
private OwnerSegment GetTableOwner(IProjectionSegment projection)
{
if (projection is IOwnerAvailable ownerAvailable)
{
return(ownerAvailable.GetOwner());
}
if (projection is ColumnProjectionSegment columnProjectionSegment)
{
return(columnProjectionSegment.GetColumn().GetOwner());
}
return(null);
}
/**
* Create projection.
*
* @param sql SQL
* @param tableSegments table segments
* @param projectionSegment projection segment
* @return projection
*/
public IProjection CreateProjection(string sql, ICollection <SimpleTableSegment> tableSegments, IProjectionSegment projectionSegment)
{
if (projectionSegment is ShorthandProjectionSegment shorthandProjectionSegment)
{
return(CreateProjection(tableSegments, shorthandProjectionSegment));
}
if (projectionSegment is ColumnProjectionSegment columnProjectionSegment)
{
return(CreateProjection(columnProjectionSegment));
}
if (projectionSegment is ExpressionProjectionSegment expressionProjectionSegment)
{
return(CreateProjection(expressionProjectionSegment));
}
if (projectionSegment is AggregationDistinctProjectionSegment aggregationDistinctProjectionSegment)
{
return(CreateProjection(sql, aggregationDistinctProjectionSegment));
}
if (projectionSegment is AggregationProjectionSegment aggregationProjectionSegment)
{
return(CreateProjection(sql, aggregationProjectionSegment));
}
// TODO subquery
return(null);
}
