private bool IsSameProjection(ShorthandProjection shorthandProjection, ColumnOrderByItemSegment orderItem, SelectCommand selectCommand)
{
if (shorthandProjection.GetOwner() == null)
{
throw new ShardingException("shorthandProjection can not found owner");
}
SimpleTableSegment tableSegment = Find(shorthandProjection.GetOwner(), selectCommand);
return(_schemaMetaData.ContainsColumn(tableSegment.GetTableName().GetIdentifier().GetValue(), orderItem.GetColumn().GetIdentifier().GetValue()));
}
private bool IsTable(SimpleTableSegment owner, ICollection <SimpleTableSegment> tableSegments)
{
foreach (var simpleTableSegment in tableSegments)
{
if (owner.GetTableName().GetIdentifier().GetValue().Equals(simpleTableSegment.GetAlias()))
{
return(false);
}
}
return(true);
}
private ShorthandProjection FindShorthandProjection(ICollection <IProjection> projections, string tableNameOrAlias, SelectCommand selectCommand)
{
SimpleTableSegment tableSegment = Find(tableNameOrAlias, selectCommand);
foreach (var projection in projections)
{
if (!(projection is ShorthandProjection))
{
continue;
}
ShorthandProjection shorthandProjection = (ShorthandProjection)projection;
if (shorthandProjection.GetOwner() != null && Find(
shorthandProjection.GetOwner(), selectCommand).GetTableName().GetIdentifier().GetValue().Equals(tableSegment.GetTableName().GetIdentifier().GetValue(), StringComparison.OrdinalIgnoreCase))
{
return(shorthandProjection);
}
}
return(null);
}