/// <summary>
/// Creates a new instance of the <see cref="TemporalTableExpression" /> class representing temporal range operation.
/// </summary>
/// <param name="table"> A table source. </param>
/// <param name="from">Start of the time range.</param>
/// <param name="to">End of the time range.</param>
/// <param name="temporalOperationType">Temporal operation type.</param>
public TemporalTableExpression(ITableBase table, DateTime from, DateTime to, TemporalOperationType temporalOperationType)
: base(table.Name.Substring(0, 1).ToLowerInvariant())
{
Name = table.Name;
Schema = table.Schema;
From = from;
To = to;
TemporalOperationType = temporalOperationType;
}
/// <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>
public TemporalRangeQueryRootExpression(
IEntityType entityType,
DateTime from,
DateTime to,
TemporalOperationType temporalOperationType)
: base(entityType)
{
From = from;
To = to;
TemporalOperationType = temporalOperationType;
}
/// <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>
public TemporalRangeQueryRootExpression(
IAsyncQueryProvider queryProvider,
IEntityType entityType,
DateTime from,
DateTime to,
TemporalOperationType temporalOperationType)
: base(queryProvider, entityType)
{
From = from;
To = to;
TemporalOperationType = temporalOperationType;
}
private static Expression GenerateRangeTemporalQueryRoot <TEntity>(
IQueryable source,
DateTime from,
DateTime to,
TemporalOperationType temporalOperationType)
{
var queryRootExpression = (QueryRootExpression)source.Expression;
var entityType = queryRootExpression.EntityType;
return(new TemporalRangeQueryRootExpression(
queryRootExpression.QueryProvider !,
entityType,
from: from,
to: to,
temporalOperationType: temporalOperationType));
}
private TemporalTableExpression(
string name,
string?schema,
string?alias,
DateTime?pointInTime,
DateTime?from,
DateTime?to,
TemporalOperationType temporalOperationType)
: base(alias)
{
Name = name;
Schema = schema;
PointInTime = pointInTime;
From = from;
To = to;
TemporalOperationType = temporalOperationType;
}
