private InnerJoinExpression(
TableExpressionBase table,
SqlExpression joinPredicate,
IEnumerable <IAnnotation>?annotations)
: base(table, joinPredicate, annotations)
{
}
private Expression BuildColumnExpression(
IReadOnlyCollection <Expression> projections,
TableExpressionBase tableExpression,
IProperty property)
{
Check.NotNull(property, nameof(property));
if (projections.Count == 0)
{
return(new ColumnExpression(
_queryCompilationContext.GetColumnName(property),
property,
tableExpression));
}
var matchingColumnExpression
= projections
.OfType <AliasExpression>()
.Last(p => p.TryGetColumnExpression()?.Property == property);
return(new ColumnExpression(
matchingColumnExpression.Alias ?? matchingColumnExpression.TryGetColumnExpression().Name,
property,
tableExpression));
}
internal ColumnExpression(ProjectionExpression subqueryProjection, TableExpressionBase table)
: this(
subqueryProjection.Alias, table,
subqueryProjection.Type, subqueryProjection.Expression.TypeMapping,
IsNullableProjection(subqueryProjection))
{
}
private static void LiftOrderBy(
SelectExpression innerJoinSelectExpression,
SelectExpression targetSelectExpression,
TableExpressionBase innerJoinExpression)
{
var needOrderingChanges
= innerJoinSelectExpression.OrderBy
.Any(x => x.Expression is SelectExpression ||
x.Expression.IsAliasWithColumnExpression() ||
x.Expression.IsAliasWithSelectExpression());
var orderings = innerJoinSelectExpression.OrderBy.ToList();
if (needOrderingChanges)
{
innerJoinSelectExpression.ClearOrderBy();
}
foreach (var ordering in orderings)
{
var orderingExpression = ordering.Expression;
var aliasExpression = ordering.Expression as AliasExpression;
if (aliasExpression?.Alias != null)
{
var columnExpression = aliasExpression.TryGetColumnExpression();
if (columnExpression != null)
{
orderingExpression
= new ColumnExpression(
aliasExpression.Alias,
columnExpression.Property,
columnExpression.Table);
}
}
var index = orderingExpression is SelectExpression
? innerJoinSelectExpression.AddAliasToProjection(innerJoinSelectExpression.Alias + "_" + innerJoinSelectExpression.Projection.Count, orderingExpression)
: innerJoinSelectExpression.AddToProjection(orderingExpression);
var expression = innerJoinSelectExpression.Projection[index];
if (needOrderingChanges)
{
innerJoinSelectExpression.AddToOrderBy(new Ordering(expression.TryGetColumnExpression() ?? expression, ordering.OrderingDirection));
}
var newExpression
= targetSelectExpression.UpdateColumnExpression(expression, innerJoinExpression);
targetSelectExpression.AddToOrderBy(new Ordering(newExpression, ordering.OrderingDirection));
}
if ((innerJoinSelectExpression.Limit == null) &&
(innerJoinSelectExpression.Offset == null))
{
innerJoinSelectExpression.ClearOrderBy();
}
}
private Expression TryParseExpression(TableExpressionBase table, IEntityType entityType, ICollection <Expression> expressions)
{
var expression = expressions.First();
var visitor = new PrivateParseExpressionVisitor(table, entityType);
return(visitor.Visit(expression));
}
private Expression BuildColumnExpression(
IReadOnlyCollection <Expression> projections,
TableExpressionBase tableExpression,
IProperty property,
IQuerySource querySource)
{
Check.NotNull(property, nameof(property));
if (projections.Count == 0)
{
return(new ColumnExpression(
_relationalAnnotationProvider.For(property).ColumnName,
property,
tableExpression));
}
var aliasExpressions
= projections
.OfType <AliasExpression>()
.Where(p => p.TryGetColumnExpression()?.Property == property)
.ToList();
var aliasExpression
= aliasExpressions.Count == 1
? aliasExpressions[0]
: aliasExpressions.Last(ae => ae.TryGetColumnExpression().Table.QuerySource == querySource);
return(new ColumnExpression(
aliasExpression.Alias ?? aliasExpression.TryGetColumnExpression().Name,
property,
tableExpression));
}
/// <summary>
/// Creates a new instance of the <see cref="PredicateJoinExpressionBase" /> class.
/// </summary>
/// <param name="table">A table source to join with.</param>
/// <param name="joinPredicate">A predicate to use for the join.</param>
/// <param name="annotations">A collection of annotations associated with this expression.</param>
protected PredicateJoinExpressionBase(
TableExpressionBase table,
SqlExpression joinPredicate,
IEnumerable <IAnnotation>?annotations)
: base(table, annotations)
{
JoinPredicate = joinPredicate;
}
public EntityProjectionExpression([NotNull] IEntityType entityType, [NotNull] TableExpressionBase innerTable, bool nullable)
{
Check.NotNull(entityType, nameof(entityType));
Check.NotNull(innerTable, nameof(innerTable));
EntityType = entityType;
_innerTable = innerTable;
_nullable = nullable;
}
protected override TableExpressionBase Visit(TableExpressionBase tableExpressionBase)
{
if (tableExpressionBase is TemporalTableExpression)
{
return(tableExpressionBase);
}
return(base.Visit(tableExpressionBase));
}
protected override TableExpressionBase Visit([NotNull] TableExpressionBase tableExpressionBase)
{
switch (tableExpressionBase)
{
case SingleRowTableExpression singleRowTableExpression:
return(singleRowTableExpression);
default:
return(base.Visit(tableExpressionBase));
}
}
private Expression BuildJoinEqualityExpression(
INavigation navigation,
TableExpressionBase targetTableExpression,
TableExpressionBase joinExpression,
IQuerySource querySource)
{
Expression joinPredicateExpression = null;
var targetTableProjections = ExtractProjections(targetTableExpression).ToList();
var joinTableProjections = ExtractProjections(joinExpression).ToList();
for (var i = 0; i < navigation.ForeignKey.Properties.Count; i++)
{
var principalKeyProperty = navigation.ForeignKey.PrincipalKey.Properties[i];
var foreignKeyProperty = navigation.ForeignKey.Properties[i];
var foreignKeyColumnExpression
= BuildColumnExpression(
targetTableProjections, targetTableExpression, foreignKeyProperty, querySource);
var primaryKeyColumnExpression
= BuildColumnExpression(
joinTableProjections, joinExpression, principalKeyProperty, querySource);
var primaryKeyExpression = primaryKeyColumnExpression;
if (foreignKeyColumnExpression.Type != primaryKeyExpression.Type)
{
if (foreignKeyColumnExpression.Type.IsNullableType() &&
!primaryKeyExpression.Type.IsNullableType())
{
primaryKeyExpression
= Expression.Convert(primaryKeyExpression, foreignKeyColumnExpression.Type);
}
else if (primaryKeyExpression.Type.IsNullableType() &&
!foreignKeyColumnExpression.Type.IsNullableType())
{
foreignKeyColumnExpression
= Expression.Convert(foreignKeyColumnExpression, primaryKeyColumnExpression.Type);
}
}
var equalExpression
= Expression.Equal(foreignKeyColumnExpression, primaryKeyExpression);
joinPredicateExpression
= joinPredicateExpression == null
? equalExpression
: Expression.AndAlso(joinPredicateExpression, equalExpression);
}
return(joinPredicateExpression);
}
private static IEnumerable <Expression> ExtractProjections(TableExpressionBase tableExpression)
{
var selectExpression = tableExpression as SelectExpression;
if (selectExpression != null)
{
return(selectExpression.Projection.ToList());
}
var joinExpression = tableExpression as JoinExpressionBase;
return(joinExpression != null
? ExtractProjections(joinExpression.TableExpression)
: Enumerable.Empty <Expression>());
}
public override void AddTable(TableExpressionBase tableExpression)
{
if (UseAsOf && tableExpression is TableExpression te)
{
base.AddTable(new AsOfTableExpression(AsOf, te.Table, te.Schema, te.Alias, te.QuerySource));
}
else if (UseBetween && tableExpression is TableExpression tableExpr)
{
base.AddTable(new BetweenTableExpression(StartTime, EndTime, tableExpr.Table, tableExpr.Schema, tableExpr.Alias, tableExpr.QuerySource));
}
else
{
base.AddTable(tableExpression);
}
}
private Expression BuildJoinEqualityExpression(
INavigation navigation,
IReadOnlyList <IProperty> primaryKeyProperties,
TableExpressionBase targetTableExpression,
TableExpressionBase joinExpression)
{
Expression joinPredicateExpression = null;
for (var i = 0; i < navigation.ForeignKey.Properties.Count; i++)
{
var primaryKeyProperty = primaryKeyProperties[i];
var foreignKeyProperty = navigation.ForeignKey.Properties[i];
var foreignKeyColumnExpression
= new ColumnExpression(
QueryCompilationContext.GetColumnName(foreignKeyProperty),
foreignKeyProperty,
targetTableExpression);
Expression primaryKeyColumnExpression
= new ColumnExpression(
QueryCompilationContext.GetColumnName(primaryKeyProperty),
primaryKeyProperty,
joinExpression);
if (foreignKeyColumnExpression.Type != primaryKeyColumnExpression.Type)
{
if (foreignKeyColumnExpression.Type.IsNullableType() &&
!primaryKeyColumnExpression.Type.IsNullableType())
{
primaryKeyColumnExpression
= Expression.Convert(primaryKeyColumnExpression, foreignKeyColumnExpression.Type);
}
}
var equalExpression
= Expression.Equal(foreignKeyColumnExpression, primaryKeyColumnExpression);
joinPredicateExpression
= joinPredicateExpression == null
? equalExpression
: Expression.AndAlso(joinPredicateExpression, equalExpression);
}
return(joinPredicateExpression);
}
private static void LiftOrderBy(
SelectExpression innerJoinSelectExpression,
SelectExpression targetSelectExpression,
TableExpressionBase innerJoinExpression)
{
foreach (var ordering in innerJoinSelectExpression.OrderBy)
{
var orderingExpression = ordering.Expression;
var aliasExpression = ordering.Expression as AliasExpression;
if (aliasExpression?.Alias != null)
{
var columnExpression = aliasExpression.TryGetColumnExpression();
if (columnExpression != null)
{
orderingExpression
= new ColumnExpression(
aliasExpression.Alias,
columnExpression.Property,
columnExpression.Table);
}
}
var index = innerJoinSelectExpression.AddToProjection(orderingExpression);
var expression = innerJoinSelectExpression.Projection[index];
var newExpression
= targetSelectExpression.UpdateColumnExpression(expression, innerJoinExpression);
targetSelectExpression.AddToOrderBy(new Ordering(newExpression, ordering.OrderingDirection));
}
if (innerJoinSelectExpression.Limit == null &&
innerJoinSelectExpression.Offset == null)
{
innerJoinSelectExpression.ClearOrderBy();
}
}
//from ef core
private static bool IsNonComposedSetOperation(SelectExpression selectExpression)
{
if (selectExpression.Offset == null && selectExpression.Limit == null && !selectExpression.IsDistinct && selectExpression.Predicate == null && selectExpression.Having == null && selectExpression.Orderings.Count == 0 && selectExpression.GroupBy.Count == 0 && selectExpression.Tables.Count == 1)
{
TableExpressionBase tableExpressionBase = selectExpression.Tables[0];
SetOperationBase setOperation = tableExpressionBase as SetOperationBase;
if (setOperation != null && selectExpression.Projection.Count == setOperation.Source1.Projection.Count)
{
return(selectExpression.Projection.Select(delegate(ProjectionExpression pe, int index)
{
ColumnExpression columnExpression = pe.Expression as ColumnExpression;
if (columnExpression != null && string.Equals(columnExpression.Table.Alias, setOperation.Alias, StringComparison.OrdinalIgnoreCase))
{
return string.Equals(columnExpression.Name, setOperation.Source1.Projection[index].Alias, StringComparison.OrdinalIgnoreCase);
}
return false;
}).All((bool e) => e));
}
}
return(false);
}
private Expression BuildColumnExpression(
IReadOnlyCollection <ColumnExpression> projections,
TableExpressionBase tableExpression,
IProperty property)
{
if (projections.Count == 0)
{
return(new ColumnExpression(
_queryCompilationContext.GetColumnName(property),
property,
tableExpression));
}
var matchingColumnExpression
= projections.Single(p => p.Property == property);
return(new ColumnExpression(
matchingColumnExpression.Alias ?? matchingColumnExpression.Name,
property,
tableExpression));
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
// Issue#11266 This method is being used by provider code. Do not break.
public static ColumnReferenceExpression LiftExpressionFromSubquery(
[NotNull] this Expression expression,
[NotNull] TableExpressionBase table)
{
Check.NotNull(expression, nameof(expression));
Check.NotNull(table, nameof(table));
switch (expression)
{
case ColumnExpression columnExpression:
return(new ColumnReferenceExpression(columnExpression, table));
case AliasExpression aliasExpression:
return(new ColumnReferenceExpression(aliasExpression, table));
case ColumnReferenceExpression columnReferenceExpression:
return(new ColumnReferenceExpression(columnReferenceExpression, table));
}
Debug.Fail("LiftExpressionFromSubquery was called on incorrect expression type.");
return(null);
}
private List <TableExpressionBase> ExtractTableExpressions(TableExpressionBase tableExpressionBase)
{
if (tableExpressionBase is JoinExpressionBase joinExpression)
{
tableExpressionBase = joinExpression.Table;
}
if (tableExpressionBase is TableExpression tableExpression)
{
return(new List <TableExpressionBase> {
tableExpression
});
}
if (tableExpressionBase is SelectExpression selectExpression)
{
var result = new List <TableExpressionBase>();
foreach (var table in selectExpression.Tables)
{
result.AddRange(ExtractTableExpressions(table));
}
return(result);
}
if (tableExpressionBase is SetOperationBase setOperationBase)
{
var result = new List <TableExpressionBase>();
result.AddRange(ExtractTableExpressions(setOperationBase.Source1));
result.AddRange(ExtractTableExpressions(setOperationBase.Source2));
return(result);
}
throw new InvalidOperationException("Unsupported table expression base type.");
}
protected JoinExpressionBase(TableExpressionBase table)
: base("")
{
Table = table;
}
/// <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 TableExpressionBase Visit(TableExpressionBase tableExpressionBase)
{
return(tableExpressionBase is TemporalTableExpression temporalTableExpression
? temporalTableExpression
: base.Visit(tableExpressionBase));
}
/// <summary>
/// Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will
/// return this expression.
/// </summary>
/// <param name="table">The <see cref="JoinExpressionBase.Table" /> property of the result.</param>
/// <param name="joinPredicate">The <see cref="PredicateJoinExpressionBase.JoinPredicate" /> property of the result.</param>
/// <returns>This expression if no children changed, or an expression with the updated children.</returns>
public virtual InnerJoinExpression Update(TableExpressionBase table, SqlExpression joinPredicate)
=> table != Table || joinPredicate != JoinPredicate
? new InnerJoinExpression(table, joinPredicate, GetAnnotations())
: this;
public EntityProjectionExpression(IEntityType entityType, TableExpressionBase innerTable, bool nullable)
{
EntityType = entityType;
_innerTable = innerTable;
_nullable = nullable;
}
/// <summary>
/// Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will
/// return this expression.
/// </summary>
/// <param name="table">The <see cref="JoinExpressionBase.Table" /> property of the result.</param>
/// <returns>This expression if no children changed, or an expression with the updated children.</returns>
public virtual OuterApplyExpression Update(TableExpressionBase table)
=> table != Table
? new OuterApplyExpression(table, GetAnnotations())
: this;
/// <summary>
/// Creates a new instance of the <see cref="OuterApplyExpression" /> class.
/// </summary>
/// <param name="table">A table source to OUTER APPLY with.</param>
public OuterApplyExpression(TableExpressionBase table)
: this(table, annotations : null)
{
}
/// <summary>
/// Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will
/// return this expression.
/// </summary>
/// <param name="table">The <see cref="JoinExpressionBase.Table" /> property of the result.</param>
/// <returns>This expression if no children changed, or an expression with the updated children.</returns>
public virtual CrossApplyExpression Update(TableExpressionBase table)
=> table != Table
? new CrossApplyExpression(table)
: this;
/// <summary>
/// Creates a new instance of the <see cref="CrossApplyExpression" /> class.
/// </summary>
/// <param name="table">A table source to CROSS APPLY with.</param>
public CrossApplyExpression(TableExpressionBase table)
: base(table)
{
}
private OuterApplyExpression(TableExpressionBase table, IEnumerable <IAnnotation>?annotations)
: base(table, annotations)
{
}
/// <summary>
/// Creates a new instance of the <see cref="CrossJoinExpression" /> class.
/// </summary>
/// <param name="table">A table source to CROSS JOIN with.</param>
public CrossJoinExpression(TableExpressionBase table)
: base(table)
{
}
public EntityProjectionExpression([NotNull] IEntityType entityType, [NotNull] TableExpressionBase innerTable, bool nullable)
{
throw new NotSupportedException();
}
