public void Visit(StarColumn starColumn)
{
if (_innerVisitor != null)
{
starColumn.Accept(_innerVisitor);
}
}
public StarModel Refine(StarModel starModel)
{
var factTable = starModel.FactTable;
int ordinalOffset = 0;
List <StarColumn> foreignColumns = new List <StarColumn>();
// Create a column for each relation that lacks link columns
foreach (var relation in factTable.Relations.Where(r => Equals(r.LinkTable, factTable) && !r.HasLinkColumns()))
{
// Create column
var foreignColumn = new StarColumn(++ordinalOffset, $"{relation.AnchorTable.Name}_Key", new DataType(OleDbType.Integer), StarColumnType.Key);
foreignColumn.TableRef = factTable;
// Add to list of foreign columns, and add to relation
foreignColumns.Add(foreignColumn);
relation.LinkColumns.Add(foreignColumn);
}
// Shift ordinals of existing columns and insert foreign columns
factTable.Columns.ForEach(c => c.Ordinal += ordinalOffset);
foreignColumns.ForEach(c => factTable.Columns.Insert(c.Ordinal - 1, c));
factTable.Constraints.PrimaryKey = new PrimaryKey(foreignColumns);
return(starModel);
}
public void Visit(StarColumn column)
{
if (!string.IsNullOrWhiteSpace(column.TableAlias))
{
Write("{0}.", column.TableAlias);
}
Write("*");
}
public static string GetAliasName(this StarColumn column, StarModelTableBase dimension = null)
{
if (dimension == null)
{
return($"[{column.TableRef.GetAlias()}_{TrimName(column.Name)}]");
}
return($"[{dimension.GetAlias()}_{TrimName(column.Name)}]");
}
public static string GetNameWithTable(this StarColumn column, bool escaped = true)
{
if (escaped)
{
return($"{column.TableRef.GetFullName()}.[{TrimName(column.Name)}]");
}
return($"{column.TableRef.GetFullName(false)}.{TrimName(column.Name)}");
}
public static string GetName(this StarColumn column, bool escaped = true)
{
if (escaped)
{
return($"[{TrimName(column.Name)}]");
}
return($"{TrimName(column.Name)}");
}
public StarModel Refine(StarModel starModel)
{
FactTable fact = starModel.FactTable;
// Create new dimension
List <StarColumn> stringColumns = new List <StarColumn>();
if (fact.Columns.Count(x => x.DataType.IsString()) == 0)
{
return(starModel);
}
var surrogateKey = new StarColumn(1, "SurKey", new DataType(OleDbType.Integer), StarColumnType.Key | StarColumnType.SurrogateKey);
stringColumns.Add(surrogateKey);
var junkColumns = fact.Columns.Where(x => x.DataType.IsString()).Select(c => new JunkColumn(c));
stringColumns.AddRange(junkColumns);
JunkDimension dimension = new JunkDimension($"Junk_{fact.Name}", stringColumns, fact.TableReference);
surrogateKey.TableRef = dimension;
dimension.Constraints.PrimaryKey.Columns.Add(surrogateKey);
dimension.Constraints.Uniques.Add(new Unique(stringColumns));
// Fact relation to new dimension
var foreignColumn = new StarColumn(0, $"{dimension.Name}_Key", new DataType(OleDbType.Integer), StarColumnType.Key);
foreignColumn.TableRef = fact;
fact.Columns.Add(foreignColumn);
// Remove string columns from fact table
starModel.FactTable.Columns.RemoveAll(c => c.DataType.IsString());
StarRelation r = new StarRelation(dimension, starModel.FactTable, new List <StarColumn>()
{
surrogateKey
}, new List <StarColumn>()
{
foreignColumn
}, Cardinality.ManyToOne);
fact.Relations.Add(r);
dimension.Relations.Add(r);
starModel.Dimensions.Add(dimension);
return(starModel);
}
private static DateDimension CreateDateDimension()
{
var dateDimension = new DateDimension("Date", DateDimension.DateGranularity.Days);
var primaryColumn = new StarColumn(1, "SurKey", new DataType(OleDbType.Integer), StarColumnType.Key | StarColumnType.SurrogateKey);
dateDimension.Constraints.PrimaryKey.Columns.Add(primaryColumn);
dateDimension.Constraints.NotNullables.Add(new StarModelComponents.NotNullable(primaryColumn));
var fullColumn = new StarColumn(2, "FullDate", new DataType(OleDbType.WChar, 10), StarColumnType.DescriptiveMeasure);
var dayColumn = new StarColumn(3, "Day", new DataType(OleDbType.SmallInt), StarColumnType.DescriptiveMeasure);
var nDayColumn = new StarColumn(4, "NameOfDay", new DataType(OleDbType.WChar, 10), StarColumnType.DescriptiveMeasure);
var weekColumn = new StarColumn(5, "Week", new DataType(OleDbType.SmallInt), StarColumnType.DescriptiveMeasure);
var monthColumn = new StarColumn(6, "Month", new DataType(OleDbType.SmallInt), StarColumnType.DescriptiveMeasure);
var nMonthColumn = new StarColumn(7, "NameOfMonth", new DataType(OleDbType.WChar, 10), StarColumnType.DescriptiveMeasure);
var yearColumn = new StarColumn(8, "Year", new DataType(OleDbType.SmallInt), StarColumnType.DescriptiveMeasure);
var isHolidayColumn = new StarColumn(9, "IsHoliday", new DataType(OleDbType.Boolean), StarColumnType.DescriptiveMeasure);
var holidayColumn = new StarColumn(10, "Holiday", new DataType(OleDbType.WChar, 32), StarColumnType.DescriptiveMeasure);
dateDimension.Columns.Add(primaryColumn); // SurKey
dateDimension.Columns.Add(fullColumn); // FullDate
dateDimension.Columns.Add(dayColumn); // Day
dateDimension.Columns.Add(nDayColumn); // NameOfDay
dateDimension.Columns.Add(weekColumn); // Week
dateDimension.Columns.Add(monthColumn); // Month
dateDimension.Columns.Add(nMonthColumn); // NameOfMonth
dateDimension.Columns.Add(yearColumn); // Year
dateDimension.Columns.Add(isHolidayColumn); // IsHoliday
dateDimension.Columns.Add(holidayColumn); // Holiday
primaryColumn.TableRef = dateDimension;
fullColumn.TableRef = dateDimension;
dayColumn.TableRef = dateDimension;
nDayColumn.TableRef = dateDimension;
weekColumn.TableRef = dateDimension;
monthColumn.TableRef = dateDimension;
nMonthColumn.TableRef = dateDimension;
yearColumn.TableRef = dateDimension;
isHolidayColumn.TableRef = dateDimension;
holidayColumn.TableRef = dateDimension;
return(dateDimension);
}
private static void AddSurrogateKey(StarModelTableBase dimension)
{
// Increment ordinal of all columns
dimension.Columns.ForEach(c => c.Ordinal++);
var surrogateKey = new StarColumn(1, "SurKey", new DataType(OleDbType.Integer), StarColumnType.Key | StarColumnType.SurrogateKey);
surrogateKey.TableRef = dimension;
// Insert surrogatekey column
dimension.Columns.Insert(0, surrogateKey);
// Add new surrogatekey to all anchor relations that lacks an anchorcolumn
foreach (var relation in dimension.Relations.Where(r => Equals(r.AnchorTable, dimension) && !r.HasAnchorColumns()))
{
relation.AnchorColumns.Add(surrogateKey);
}
dimension.Constraints.PrimaryKey.Columns.Add(surrogateKey);
dimension.Constraints.NotNullables.Add(new StarModelComponents.NotNullable(surrogateKey));
}
private static TimeDimension CreateTimeDimension()
{
var timeDimension = new TimeDimension("Time", TimeDimension.TimeGranularity.Seconds);
var primaryColumn = new StarColumn(1, "SurKey", new DataType(OleDbType.Integer), StarColumnType.Key | StarColumnType.SurrogateKey);
timeDimension.Constraints.PrimaryKey.Columns.Add(primaryColumn);
timeDimension.Constraints.NotNullables.Add(new StarModelComponents.NotNullable(primaryColumn));
var hourColumn = new StarColumn(2, "Hour", new DataType(OleDbType.SmallInt), StarColumnType.DescriptiveMeasure);
var minuteColumn = new StarColumn(3, "Minute", new DataType(OleDbType.SmallInt), StarColumnType.DescriptiveMeasure);
var secondColumn = new StarColumn(4, "Second", new DataType(OleDbType.SmallInt), StarColumnType.DescriptiveMeasure);
timeDimension.Columns.Add(primaryColumn); // Surkey
timeDimension.Columns.Add(hourColumn); // Hour
timeDimension.Columns.Add(minuteColumn); // Minute
timeDimension.Columns.Add(secondColumn); // Second
primaryColumn.TableRef = timeDimension;
hourColumn.TableRef = timeDimension;
minuteColumn.TableRef = timeDimension;
secondColumn.TableRef = timeDimension;
return(timeDimension);
}
public StarModel Refine(StarModel starModel)
{
var factTable = starModel.FactTable;
// If any date/time dimension already exists
if (starModel.Dimensions.Any(d => d.Name.Contains("time") || d.Name.Contains("date")))
{
return(starModel);
}
// Create date and time dimension for model. These are also used for roleplaying
DateDimension actualDateDimension = CreateDateDimension();
TimeDimension actualTimeDimension = CreateTimeDimension();
// These can either be the actual dimension or roleplaying dimensions
DateDimension dateDimension = null;
TimeDimension timeDimension = null;
// Add a date and/or time dimension to all columns that can express date or time
foreach (var temporalColumn in factTable.Columns.Where(c => c.DataType.IsTemporal()).ToList())
{
// If date, only add date dimension, likewise with time. If a date/time dimension is already in use,
// then use that for roleplaying
switch (temporalColumn.DataType.Type)
{
case OleDbType.DBTime:
timeDimension = timeDimension != null ? new TimeDimension(actualTimeDimension) : actualTimeDimension;
break;
case OleDbType.Date:
case OleDbType.DBDate:
dateDimension = dateDimension != null ? new DateDimension(actualDateDimension) : actualDateDimension;
break;
case OleDbType.DBTimeStamp:
dateDimension = dateDimension != null ? new DateDimension(actualDateDimension) : actualDateDimension;
timeDimension = timeDimension != null ? new TimeDimension(actualTimeDimension) : actualTimeDimension;
break;
}
// If time dimension is set, then add it to the model and add a relation
if (timeDimension != null)
{
starModel.Dimensions.Add(timeDimension);
var timeForeignKey = new StarColumn(factTable.Columns.Count + 1, $"{temporalColumn.Name}_Time_Key", new DataType(OleDbType.Integer), StarColumnType.Key);
timeForeignKey.ColumnRef = temporalColumn.ColumnRef;
var relation = new StarRelation(timeDimension, factTable, new List <StarColumn> {
timeDimension.Columns[0]
}, new List <StarColumn> {
timeForeignKey
}, Cardinality.ManyToOne);
factTable.Relations.Add(relation);
timeDimension.Relations.Add(relation);
factTable.Columns.Add(timeForeignKey);
factTable.Constraints.PrimaryKey.Columns.Add(timeForeignKey);
}
// If date dimension is set, then add it to the model and add a relation
if (dateDimension != null)
{
starModel.Dimensions.Add(dateDimension);
var dateForeignKey = new StarColumn(factTable.Columns.Count + 1, $"{temporalColumn.Name}_Date_Key", new DataType(OleDbType.Integer), StarColumnType.Key);
dateForeignKey.ColumnRef = temporalColumn.ColumnRef;
var relation = new StarRelation(dateDimension, factTable, new List <StarColumn> {
dateDimension.Columns[0]
}, new List <StarColumn> {
dateForeignKey
}, Cardinality.ManyToOne);
factTable.Relations.Add(relation);
dateDimension.Relations.Add(relation);
factTable.Columns.Add(dateForeignKey);
factTable.Constraints.PrimaryKey.Columns.Add(dateForeignKey);
}
temporalColumn.ColumnType = StarColumnType.DescriptiveMeasure;
// Cleanup
factTable.Columns.Remove(temporalColumn);
}
return(starModel);
}
public void Visit(StarColumn starColumn)
{
}
