private Expression ExecuteProjection(ProjectionExpression projection, bool okayToDefer, bool isTopLevel)
{
// parameterize query
projection = (ProjectionExpression)this.Parameterize(projection);
if (this.scope != null)
{
// also convert references to outer alias to named values! these become SQL parameters too
projection = (ProjectionExpression)OuterParameterizer.Parameterize(this.scope.Alias, projection);
}
string commandText = this.linguist.Format(projection.Select);
ReadOnlyCollection <NamedValueExpression> namedValues = NamedValueGatherer.Gather(projection.Select);
QueryCommand command = new QueryCommand(commandText, namedValues.Select(v => new QueryParameter(v.Name, v.Type, v.QueryType)));
Expression[] values = namedValues.Select(v => Expression.Convert(this.Visit(v.Value), typeof(object))).ToArray();
string methExecute = okayToDefer
? nameof(QueryExecutor.ExecuteDeferred)
: nameof(QueryExecutor.Execute);
var plan = Expression.Call(this.executor, methExecute, new Type[] { projection.Projector.Type },
Expression.Constant(command),
Expression.NewArrayInit(typeof(object), values)
);
return(plan);
}
// end mike
private Expression ExecuteProjection(ProjectionExpression projection, bool okayToDefer)
{
okayToDefer &= (receivingMember != null && policy.IsDeferLoaded(receivingMember));
// parameterize query
projection = (ProjectionExpression)policy.Mapping.Language.Parameterize(projection);
if (scope != null)
{
// also convert references to outer alias to named values! these become SQL parameters too
projection = (ProjectionExpression)OuterParameterizer.Parameterize(scope.Alias, projection);
}
var saveScope = scope;
ParameterExpression reader = Expression.Parameter(typeof(DbDataReader), "r" + nReaders++);
scope = new Scope(scope, reader, projection.Source.Alias, projection.Source.Columns);
LambdaExpression projector = Expression.Lambda(Visit(projection.Projector), reader);
scope = saveScope;
List <string> columnNames = ColumnNamedGatherer.Gather(projector.Body); //mike
string commandText = policy.Mapping.Language.Format(projection.Source);
var namedValues = NamedValueGatherer.Gather(projection.Source);
var names = namedValues.Select(v => v.Name).ToArray();
Expression[] values = namedValues.Select(v => Expression.Convert(
v.ParameterBindingAction != null ? v.ParameterBindingAction((ConstantExpression)v.Value) : Visit(v.Value),
typeof(object))).ToArray();
string methExecute = okayToDefer
? "ExecuteDeferred"
: "Execute";
if (okayToDefer)
{
}
// call low-level execute directly on supplied DbQueryProvider
Expression result = Expression.Call(provider, methExecute, new[] { projector.Body.Type },
Expression.New(
typeof(QueryCommand <>).MakeGenericType(projector.Body.Type).
GetConstructors()[0],
Expression.Constant(commandText),
Expression.Constant(names),
projector, Expression.Constant(columnNames)
),
Expression.NewArrayInit(typeof(object), values)
);
if (projection.Aggregator != null)
{
// apply aggregator
result = DbExpressionReplacer.Replace(projection.Aggregator.Body, projection.Aggregator.Parameters[0],
result);
}
return(result);
}
private Expression ExecuteProjection(ProjectionExpression projection, bool okayToDefer)
{
projection = (ProjectionExpression)Parameterize(projection);
if (_scope != null)
{
projection = (ProjectionExpression)OuterParameterizer.Parameterize(_scope.Alias, projection);
}
return(BuildExecuteEnumerableCommand(projection, okayToDefer));
}
private Expression ExecuteProjection(ProjectionExpression projection, bool okayToDefer)
{
projection = (ProjectionExpression)this.Parameterize(projection);
if (this.scope != null)
{
projection = (ProjectionExpression)OuterParameterizer.Parameterize(this.scope.Alias, projection);
}
string commandText = this.linguist.Format(projection.Select);
ReadOnlyCollection <NamedValueExpression> onlys = NamedValueGatherer.Gather(projection.Select);
QueryCommand command = new QueryCommand(commandText, from v in onlys select new QueryParameter(v.Name, v.Type, v.QueryType));
Expression[] values = (from v in onlys select Expression.Convert(this.Visit(v.Value), typeof(object))).ToArray <UnaryExpression>();
return(this.ExecuteProjection(projection, okayToDefer, command, values));
}
private Expression ExecuteProjection(DbProjectionExpression projection, bool okayToDefer, bool isTopLevel)
{
projection = this.Parameterize(projection) as DbProjectionExpression;
if (this.scope != null)
{
projection = OuterParameterizer.Parameterize(this.scope.Alias, projection) as DbProjectionExpression;
}
var commandText = this.linguist.Format(projection.Select);
var namedValues = DbNamedValueGatherer.Gather(projection.Select);
var command = new QueryCommand(commandText, namedValues.Select(v => new QueryParameter(v.Name, v.Type, v.QueryType)));
var values = namedValues.Select(v => Expression.Convert(this.Visit(v.Value), typeof(object))).ToArray() as Expression[];
return(this.ExecuteProjection(projection, okayToDefer, command, values, isTopLevel));
}
private Expression ExecuteProjection(ProjectionExpression projection, bool okayToDefer)
{
projection = (ProjectionExpression)this.Parameterize(projection);
if (this.scope != null)
{
// also convert references to outer alias to named values! these become SQL parameters too
projection = (ProjectionExpression)OuterParameterizer.Parameterize(this.scope.Alias, projection);
}
string commandText = this.dbContext.BuildSql(projection.Select);
ReadOnlyCollection <NamedValueExpression> namedValues = NamedValueGatherer.Gather(projection.Select);
Expression[] values = namedValues.Select(v => Expression.Convert(this.Visit(v.Value), typeof(object))).ToArray();
return(this.ExecuteProjection(projection, okayToDefer, commandText, namedValues.Select(v => new NamedParameter(v.Name, v.Type, v.SqlType)).ToArray(), values));
}
private Expression ExecuteProjection(DbProjectionExpression projection, bool okayToDefer)
{
// parameterize query
projection = (DbProjectionExpression)this.Parameterize(projection);
if (this.scope != null)
{
// also convert references to outer alias to named values! these become SQL parameters too
projection = (DbProjectionExpression)OuterParameterizer.Parameterize(this.scope.Alias, projection);
}
string commandText = this.mapping.Language.Format(projection.Select);
ReadOnlyCollection <DbNamedValueExpression> namedValues = NamedValueGatherer.Gather(projection.Select);
QueryCommand command = new QueryCommand(commandText, namedValues.Select(v => new QueryParameter(v.Name, v.Type, v.DbType)), null);
Expression[] values = namedValues.Select(v => Expression.Convert(this.Visit(v.Value), typeof(object))).ToArray();
return(this.ExecuteProjection(projection, okayToDefer, command, values));
}
private Expression ExecuteProjection(ProjectionExpression projection, bool okayToDefer)
{
// parameterize query
projection = (ProjectionExpression)Parameterize(projection);
if (scope != null)
{
// also convert references to outer alias to named values! these become SQL parameters too
projection = (ProjectionExpression)OuterParameterizer.Parameterize(scope.Alias, projection);
}
string commandText = linguist.Format(projection.Select);
ReadOnlyCollection <NamedValueExpression> namedValues = NamedValueGatherer.Gather(projection.Select);
var command = new QueryCommand(commandText, namedValues.Select(v => new QueryParameter(v.Name, v.Type, v.QueryType)));
Expression[] values = namedValues.Select(v => Expression.Convert(Visit(v.Value), typeof(object))).ToArray();
return(ExecuteProjection(projection, okayToDefer, command, values));
}