private IEnumerable <Expression> CreateIncludeRelatedValuesStrategyFactories(
IQuerySource querySource,
IEnumerable <INavigation> navigationPath)
{
var selectExpression
= _queryCompilationContext.FindSelectExpression(querySource);
var targetTableExpression
= selectExpression.FindTableForQuerySource(querySource);
var readerIndex = 0;
var canProduceInnerJoin = true;
foreach (var navigation in navigationPath)
{
var targetEntityType = navigation.GetTargetType();
var targetTableName = _queryCompilationContext.GetTableName(targetEntityType);
var targetTableAlias = targetTableName[0].ToString().ToLower();
if (!navigation.IsCollection())
{
var joinedTableExpression
= new TableExpression(
targetTableName,
_queryCompilationContext.GetSchema(targetEntityType),
targetTableAlias,
querySource);
var valueBufferOffset = selectExpression.Projection.Count;
canProduceInnerJoin
= canProduceInnerJoin &&
(navigation.ForeignKey.IsRequired &&
navigation.PointsToPrincipal());
var joinExpression
= canProduceInnerJoin
? selectExpression
.AddInnerJoin(joinedTableExpression)
: selectExpression
.AddOuterJoin(joinedTableExpression);
var materializer
= new MaterializerFactory(
_queryCompilationContext.EntityMaterializerSource)
.CreateMaterializer(
targetEntityType,
selectExpression,
projectionAdder:
(p, se) => se.AddToProjection(
new AliasExpression(
new ColumnExpression(
_queryCompilationContext.GetColumnName(p),
p,
joinedTableExpression))) - valueBufferOffset,
querySource: null);
joinExpression.Predicate
= BuildJoinEqualityExpression(
navigation,
(navigation.PointsToPrincipal()
? targetEntityType
: navigation.EntityType)
.GetPrimaryKey().Properties,
navigation.PointsToPrincipal() ? targetTableExpression : joinExpression,
navigation.PointsToPrincipal() ? joinExpression : targetTableExpression);
targetTableExpression = joinedTableExpression;
yield return
(Expression.Lambda(
Expression.Call(
_queryCompilationContext.QueryMethodProvider
.CreateReferenceIncludeRelatedValuesStrategyMethod,
Expression.Convert(
EntityQueryModelVisitor.QueryContextParameter,
typeof(RelationalQueryContext)),
Expression.Constant(valueBufferOffset),
Expression.Constant(readerIndex),
materializer)));
}
else
{
var principalTable
= selectExpression.Tables.Last(t => t.QuerySource == querySource);
foreach (var property in navigation.EntityType.GetPrimaryKey().Properties)
{
selectExpression
.AddToOrderBy(
_queryCompilationContext.GetColumnName(property),
property,
principalTable,
OrderingDirection.Asc);
}
var targetSelectExpression = new SelectExpression();
targetTableExpression
= new TableExpression(
targetTableName,
_queryCompilationContext.GetSchema(targetEntityType),
targetTableAlias,
querySource);
targetSelectExpression.AddTable(targetTableExpression);
var materializer
= new MaterializerFactory(
_queryCompilationContext.EntityMaterializerSource)
.CreateMaterializer(
targetEntityType,
targetSelectExpression,
(p, se) => se.AddToProjection(
_queryCompilationContext.GetColumnName(p),
p,
querySource),
querySource: null);
var innerJoinSelectExpression
= selectExpression.Clone(
selectExpression.OrderBy.Select(o => o.Expression).Last(o => o.IsAliasWithColumnExpression())
.TryGetColumnExpression().TableAlias);
innerJoinSelectExpression.IsDistinct = true;
innerJoinSelectExpression.ClearProjection();
foreach (var expression
in innerJoinSelectExpression.OrderBy
.Select(o => o.Expression))
{
innerJoinSelectExpression.AddToProjection(expression);
}
innerJoinSelectExpression.ClearOrderBy();
var primaryKeyProperties = navigation.EntityType.GetPrimaryKey().Properties;
var innerJoinExpression
= targetSelectExpression.AddInnerJoin(innerJoinSelectExpression);
targetSelectExpression.UpdateOrderByColumnBinding(selectExpression.OrderBy, innerJoinExpression);
innerJoinExpression.Predicate
= BuildJoinEqualityExpression(
navigation,
primaryKeyProperties,
targetTableExpression,
innerJoinExpression);
selectExpression = targetSelectExpression;
readerIndex++;
yield return
(Expression.Lambda(
Expression.Call(
_queryCompilationContext.QueryMethodProvider
.CreateCollectionIncludeRelatedValuesStrategyMethod,
Expression.Call(
_queryCompilationContext.QueryMethodProvider.QueryMethod,
EntityQueryModelVisitor.QueryContextParameter,
Expression.Constant(
new CommandBuilder(
() => _queryCompilationContext.CreateSqlQueryGenerator(targetSelectExpression),
_queryCompilationContext.ValueBufferFactoryFactory))),
materializer)));
}
}
}
private IEnumerable <Expression> CreateIncludeRelatedValuesStrategyFactories(
IQuerySource querySource,
IEnumerable <INavigation> navigationPath)
{
var selectExpression
= _queryCompilationContext.FindSelectExpression(querySource);
var targetTableExpression
= selectExpression.FindTableForQuerySource(querySource);
var readerIndex = 0;
foreach (var navigation in navigationPath)
{
if (!navigation.IsCollection())
{
var targetEntityType = navigation.GetTargetType();
var targetTableName = _queryCompilationContext.GetTableName(targetEntityType);
var targetTableAlias = targetTableName.First().ToString().ToLower();
var joinedTableExpression
= new TableExpression(
targetTableName,
_queryCompilationContext.GetSchema(targetEntityType),
targetTableAlias,
querySource);
var readerOffset = selectExpression.Projection.Count;
var columnExpressions
= targetEntityType.Properties
.Select(p => new ColumnExpression(
_queryCompilationContext.GetColumnName(p),
p,
joinedTableExpression));
var joinExpression
= navigation.ForeignKey.IsRequired &&
navigation.PointsToPrincipal
? selectExpression
.AddInnerJoin(joinedTableExpression, columnExpressions)
: selectExpression
.AddOuterJoin(joinedTableExpression, columnExpressions);
joinExpression.Predicate
= BuildJoinEqualityExpression(
navigation,
(navigation.PointsToPrincipal
? targetEntityType
: navigation.EntityType)
.GetPrimaryKey().Properties,
navigation.PointsToPrincipal ? targetTableExpression : joinExpression,
navigation.PointsToPrincipal ? joinExpression : targetTableExpression);
targetTableExpression = joinedTableExpression;
yield return
(Expression.Lambda(
Expression.Call(
_queryCompilationContext.QueryMethodProvider
.CreateReferenceIncludeRelatedValuesStrategyMethod,
Expression.Convert(EntityQueryModelVisitor.QueryContextParameter, typeof(RelationalQueryContext)),
Expression.Constant(readerIndex),
Expression.Constant(readerOffset))));
}
else
{
var principalTable
= selectExpression.Tables.Last(t => t.QuerySource == querySource);
foreach (var property in navigation.EntityType.GetPrimaryKey().Properties)
{
selectExpression
.AddToOrderBy(
_queryCompilationContext.GetColumnName(property),
property,
principalTable,
OrderingDirection.Asc);
}
var targetEntityType = navigation.GetTargetType();
var targetTableName = _queryCompilationContext.GetTableName(targetEntityType);
var targetTableAlias = targetTableName.First().ToString().ToLower();
var targetSelectExpression = new SelectExpression();
targetTableExpression
= new TableExpression(
targetTableName,
_queryCompilationContext.GetSchema(targetEntityType),
targetTableAlias,
querySource);
targetSelectExpression.AddTable(targetTableExpression);
foreach (var property in targetEntityType.Properties)
{
targetSelectExpression
.AddToProjection(
_queryCompilationContext.GetColumnName(property),
property,
querySource);
}
var innerJoinSelectExpression
= selectExpression.Clone(
((ColumnExpression)selectExpression.OrderBy.Last().Expression).TableAlias);
innerJoinSelectExpression.IsDistinct = true;
innerJoinSelectExpression.ClearProjection();
foreach (var columnExpression
in innerJoinSelectExpression.OrderBy
.Select(o => o.Expression)
.Cast <ColumnExpression>())
{
innerJoinSelectExpression.AddToProjection(columnExpression);
}
innerJoinSelectExpression.ClearOrderBy();
var primaryKeyProperties = navigation.EntityType.GetPrimaryKey().Properties;
var innerJoinExpression
= targetSelectExpression.AddInnerJoin(innerJoinSelectExpression);
foreach (var ordering in selectExpression.OrderBy)
{
var columnExpression = (ColumnExpression)ordering.Expression;
targetSelectExpression
.AddToOrderBy(
columnExpression.Name,
columnExpression.Property,
innerJoinExpression,
ordering.OrderingDirection);
}
innerJoinExpression.Predicate
= BuildJoinEqualityExpression(
navigation,
primaryKeyProperties,
targetTableExpression,
innerJoinExpression);
var readerParameter = Expression.Parameter(typeof(DbDataReader));
selectExpression = targetSelectExpression;
readerIndex++;
yield return
(Expression.Lambda(
Expression.Call(
_queryCompilationContext.QueryMethodProvider
.CreateCollectionIncludeRelatedValuesStrategyMethod,
Expression.Call(
_queryCompilationContext.QueryMethodProvider.QueryMethod
.MakeGenericMethod(typeof(IValueReader)),
EntityQueryModelVisitor.QueryContextParameter,
Expression.Constant(new CommandBuilder(targetSelectExpression, _queryCompilationContext)),
Expression.Lambda(
Expression.Call(
_createValueReaderForIncludeMethodInfo,
EntityQueryModelVisitor.QueryContextParameter,
readerParameter,
Expression.Constant(targetEntityType)),
readerParameter)))));
}
}
}