protected virtual Expression BuildExecuteBatch(BatchExpression batch)
{
Expression expression = this.Parameterize(batch.Operation.Body);
string commandText = this.linguist.Format(expression);
ReadOnlyCollection <NamedValueExpression> onlys = NamedValueGatherer.Gather(expression);
QueryCommand command = new QueryCommand(commandText, from v in onlys select new QueryParameter(v.Name, v.Type, v.QueryType));
Expression[] initializers = (from v in onlys select Expression.Convert(this.Visit(v.Value), typeof(object))).ToArray <UnaryExpression>();
Expression expression2 = Expression.Call(typeof(Enumerable), "Select", new Type[] { batch.Operation.Parameters[1].Type, typeof(object[]) }, new Expression[] { batch.Input, Expression.Lambda(Expression.NewArrayInit(typeof(object), initializers), new ParameterExpression[] { batch.Operation.Parameters[1] }) });
ProjectionExpression expression4 = ProjectionFinder.FindProjection(expression);
if (expression4 != null)
{
Scope scope = this.scope;
ParameterExpression fieldReader = Expression.Parameter(typeof(FieldReader), "r" + this.nReaders++);
this.scope = new Scope(this.scope, fieldReader, expression4.Select.Alias, expression4.Select.Columns);
LambdaExpression expression6 = Expression.Lambda(this.Visit(expression4.Projector), new ParameterExpression[] { fieldReader });
this.scope = scope;
MappingEntity entity = EntityFinder.Find(expression4.Projector);
command = new QueryCommand(command.CommandText, command.Parameters);
return(Expression.Call(this.executor, "ExecuteBatch", new Type[] { expression6.Body.Type }, new Expression[] { Expression.Constant(command), expression2, expression6, Expression.Constant(entity, typeof(MappingEntity)), batch.BatchSize, batch.Stream }));
}
return(Expression.Call(this.executor, "ExecuteBatch", (Type[])null, new Expression[] { Expression.Constant(command), expression2, batch.BatchSize, batch.Stream }));
}
private Expression ExecuteProjection(ProjectionExpression projection, bool okayToDefer, QueryCommand command, Expression[] values)
{
okayToDefer &= (this.receivingMember != null) && this.policy.IsDeferLoaded(this.receivingMember);
Scope scope = this.scope;
ParameterExpression fieldReader = Expression.Parameter(typeof(FieldReader), "r" + this.nReaders++);
this.scope = new Scope(this.scope, fieldReader, projection.Select.Alias, projection.Select.Columns);
LambdaExpression expression2 = Expression.Lambda(this.Visit(projection.Projector), new ParameterExpression[] { fieldReader });
this.scope = scope;
MappingEntity entity = EntityFinder.Find(projection.Projector);
string methodName = okayToDefer ? "ExecuteDeferred" : "Execute";
Expression replaceWith = Expression.Call(this.executor, methodName, new Type[] { expression2.Body.Type }, new Expression[] { Expression.Constant(command), expression2, Expression.Constant(entity, typeof(MappingEntity)), Expression.NewArrayInit(typeof(object), values) });
if (projection.Aggregator != null)
{
replaceWith = DbExpressionReplacer.Replace(projection.Aggregator.Body, projection.Aggregator.Parameters[0], replaceWith);
}
return(replaceWith);
}
public abstract IEnumerable <T> ExecuteDeferred <T>(QueryCommand query, Func <FieldReader, T> fnProjector, MappingEntity entity, object[] paramValues);
public abstract int ExecuteCommand(QueryCommand query, object[] paramValues);
public abstract IEnumerable <T> ExecuteBatch <T>(QueryCommand query, IEnumerable <object[]> paramSets, Func <FieldReader, T> fnProjector, MappingEntity entity, int batchSize, bool stream);
public abstract IEnumerable <int> ExecuteBatch(QueryCommand query, IEnumerable <object[]> paramSets, int batchSize, bool stream);