/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
protected override Expression VisitExtension(Expression extensionExpression)
{
if (extensionExpression is TemporalQueryRootExpression queryRootExpression)
{
// sql server model validator will throw if entity is mapped to multiple tables
var table = queryRootExpression.EntityType.GetTableMappings().Single().Table;
var temporalTableExpression = queryRootExpression switch
{
TemporalAllQueryRootExpression _ => (TemporalTableExpression) new TemporalAllTableExpression(table),
TemporalAsOfQueryRootExpression asOf => new TemporalAsOfTableExpression(table, asOf.PointInTime),
TemporalBetweenQueryRootExpression between => new TemporalBetweenTableExpression(table, between.From, between.To),
TemporalContainedInQueryRootExpression containedIn => new TemporalContainedInTableExpression(table, containedIn.From, containedIn.To),
TemporalFromToQueryRootExpression fromTo => new TemporalFromToTableExpression(table, fromTo.From, fromTo.To),
_ => throw new InvalidOperationException(queryRootExpression.Print())
};
var selectExpression = RelationalDependencies.SqlExpressionFactory.Select(
queryRootExpression.EntityType,
temporalTableExpression);
return(new ShapedQueryExpression(
selectExpression,
new RelationalEntityShaperExpression(
queryRootExpression.EntityType,
new ProjectionBindingExpression(
selectExpression,
new ProjectionMember(),
typeof(ValueBuffer)),
false)));
}
return(base.VisitExtension(extensionExpression));
}
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
protected override Expression VisitExtension(Expression extensionExpression)
{
if (extensionExpression is TemporalAsOfQueryRootExpression ||
extensionExpression is TemporalRangeQueryRootExpression ||
extensionExpression is TemporalAllQueryRootExpression)
{
var queryRootExpression = (QueryRootExpression)extensionExpression;
// sql server model validator will throw if entity is mapped to multiple tables
var table = queryRootExpression.EntityType.GetTableMappings().Single().Table;
var temporalTableExpression = queryRootExpression switch
{
TemporalRangeQueryRootExpression range => new TemporalTableExpression(
table,
range.From,
range.To,
range.TemporalOperationType),
TemporalAsOfQueryRootExpression asOf => new TemporalTableExpression(table, asOf.PointInTime),
// all
_ => new TemporalTableExpression(table),
};
var selectExpression = RelationalDependencies.SqlExpressionFactory.Select(
queryRootExpression.EntityType,
temporalTableExpression);
return(new ShapedQueryExpression(
selectExpression,
new RelationalEntityShaperExpression(
queryRootExpression.EntityType,
new ProjectionBindingExpression(
selectExpression,
new ProjectionMember(),
typeof(ValueBuffer)),
false)));
}
return(base.VisitExtension(extensionExpression));
}
