private static IEnumerable <TResult> GetFromCache <TResult>(OeParseUriContext parseUriContext, T dbContext, Db.OeQueryCache queryCache)
{
Db.QueryCacheItem queryCacheItem = queryCache.GetQuery(parseUriContext);
Func <QueryContext, IEnumerable <TResult> > queryExecutor;
if (queryCacheItem == null)
{
IQueryable query = parseUriContext.EntitySetAdapter.GetEntitySet(dbContext);
var parameterVisitor = new OeConstantToParameterVisitor();
Expression expression = parseUriContext.CreateExpression(query, parameterVisitor);
queryExecutor = dbContext.CreateQueryExecutor <TResult>(expression);
queryCache.AddQuery(parseUriContext, queryExecutor, parameterVisitor.ConstantToParameterMapper);
parseUriContext.ParameterValues = parameterVisitor.ParameterValues;
}
else
{
queryExecutor = (Func <QueryContext, IEnumerable <TResult> >)queryCacheItem.Query;
parseUriContext.EntryFactory = queryCacheItem.EntryFactory;
}
var queryContextFactory = dbContext.GetService <IQueryContextFactory>();
var queryContext = queryContextFactory.Create();
foreach (Db.OeQueryCacheDbParameterValue parameterValue in parseUriContext.ParameterValues)
{
queryContext.AddParameter(parameterValue.ParameterName, parameterValue.ParameterValue);
}
return(queryExecutor(queryContext));
}
protected IQueryable CreateQuery(OeParseUriContext parseUriContext, Object dataContext, OeConstantToVariableVisitor constantToVariableVisitor)
{
IQueryable query = parseUriContext.EntitySetAdapter.GetEntitySet(dataContext);
Expression expression = parseUriContext.CreateExpression(query, constantToVariableVisitor);
return(query.Provider.CreateQuery(expression));
}
public override TResult ExecuteScalar <TResult>(OeParseUriContext parseUriContext, object dataContext)
{
IQueryable query = parseUriContext.EntitySetAdapter.GetEntitySet(dataContext);
Expression expression = parseUriContext.CreateExpression(query, new OeConstantToVariableVisitor());
return(query.Provider.Execute <TResult>(expression));
}
public override OeEntityAsyncEnumerator ExecuteEnumerator(Object dataContext, OeParseUriContext parseUriContext, CancellationToken cancellationToken)
{
IQueryable entitySet = parseUriContext.EntitySetAdapter.GetEntitySet(dataContext);
Expression expression = parseUriContext.CreateExpression(entitySet, new OeConstantToVariableVisitor());
expression = new ParameterVisitor().Visit(expression);
var query = (IQueryable <Object>)entitySet.Provider.CreateQuery(expression);
return(new OeEntityAsyncEnumeratorAdapter(query, cancellationToken));
}
public override Db.OeEntityAsyncEnumerator ExecuteEnumerator(OeParseUriContext parseUriContext, Object dataContext, CancellationToken cancellationToken)
{
IQueryable query = parseUriContext.EntitySetAdapter.GetEntitySet(dataContext);
Expression expression = parseUriContext.CreateExpression(query, new OeConstantToVariableVisitor());
expression = new EnumerableToQuerableVisitor().Visit(expression);
var queryAsync = (IDbAsyncEnumerable)query.Provider.CreateQuery(expression);
return(new OeEf6EntityAsyncEnumerator(queryAsync.GetAsyncEnumerator(), cancellationToken));
}
public override TResult ExecuteScalar <TResult>(Object dataContext, OeParseUriContext parseUriContext)
{
if (base.QueryCache.AllowCache)
{
return(GetFromCache <TResult>(parseUriContext, (T)dataContext, base.QueryCache).Single());
}
IQueryable query = parseUriContext.EntitySetAdapter.GetEntitySet(dataContext);
Expression expression = parseUriContext.CreateExpression(query, new OeConstantToVariableVisitor());
return(query.Provider.Execute <TResult>(expression));
}