internal virtual void Where(GremlinToSqlContext currentContext, string startKey, Predicate predicate, TraversalRing traversalRing)
{
var selectKey = new List <string> {
startKey
};
var selectTraversal = new List <GraphTraversal2> {
traversalRing.Next()
};
var firstVar = GetSelectVar(currentContext, GremlinKeyword.Pop.Last, selectKey, selectTraversal);
currentContext.AddPredicate(GetWherePredicate(currentContext, firstVar, predicate, traversalRing));
}
internal WBooleanExpression GetWherePredicate(GremlinToSqlContext currentContext, GremlinVariable firstVar, Predicate predicate, TraversalRing traversalRing)
{
AndPredicate andPredicate = predicate as AndPredicate;
if (andPredicate != null)
{
List <WBooleanExpression> booleanList = new List <WBooleanExpression>();
foreach (var p in andPredicate.PredicateList)
{
booleanList.Add(GetWherePredicate(currentContext, firstVar, p, traversalRing));
}
return(SqlUtil.ConcatBooleanExprWithAnd(booleanList));
}
OrPredicate orPredicate = predicate as OrPredicate;
if (orPredicate != null)
{
List <WBooleanExpression> booleanList = new List <WBooleanExpression>();
foreach (var p in orPredicate.PredicateList)
{
booleanList.Add(GetWherePredicate(currentContext, firstVar, p, traversalRing));
}
return(SqlUtil.ConcatBooleanExprWithOr(booleanList));
}
var selectKeys = new List <string>()
{
predicate.Value as string
};
var selectTraversal = new List <GraphTraversal2>()
{
traversalRing.Next()
};
var selectVar = GetSelectVar(currentContext, GremlinKeyword.Pop.Last, selectKeys, selectTraversal);
var firstExpr = firstVar.GetDefaultProjection().ToScalarExpression();
var secondExpr = selectVar.GetDefaultProjection().ToScalarExpression();
return(SqlUtil.GetBooleanComparisonExpr(firstExpr, secondExpr, predicate));
}