WhereExpFragment class

WhereExpFragment

Represents a data cache specification column with user data.

Parent class

Inherits from object

Constructors

• (string expression "Expression for the fragment.") - Create a fragment with the given expression. This is an expensive operation when called many times
  
• (string selector "Selector expression of the where expression, e.g. "count()".", WhereExpFragment whereExp "Left hand side of the operation.") - Create a fragment as a complete where expression.
  
• (WhereExpFragment fragment "Fragment to replace values in.", Dictionary replacement "Look for keys and replace with the constants.") - Create a new fragment where the given values has been replaced, e.g. col > DATES + {"DATES":#2020...#} => col > #2020...#.
  
• (int operation "See WHEREEXPFRAGMENT_xxx, e.g. WHEREEXPFRAGMENT_AND.", WhereExpFragment lhs "Left hand side of the operation.", WhereExpFragment rhs "Right hand side of the operation.") - Create a new fragment as an operation between two other fragments.
  

Methods

• Empty AddDependency(string key "Key in Dictionary that this expression depends on") - If you access another cell, you need to inform the engine about this, so it can determine which cells to execute in parallel
  
• (From object) string ToString() - The string representation of the object.
  

Properties

• string ObjectTypeName { get; } - The name of the type of object.
  
• (From object) TypeInformation TypeInformation { get; } - Get information about this class.
  

Examples

DataCacheSpecification dcs = new DataCacheSpecification (dcsRId);
Dictionary exp = {
	"Total": new WhereExpFragment (WHEREEXPFRAGMENT_ADD, new WhereExpFragment ("count() where Gender==1"), new WhereExpFragment ("count() where Gender==2")),
	"Male": new WhereExpFragment ("count()", new WhereExpFragment ("Gender==1")),
	"Female": new WhereExpFragment ("count() where Gender==2")};
dcs.EvalWhereExps(exp);