protected override Expression VisitProjection(SqlProjectionExpression projectionExpression)
{
if (typeof(RelatedDataAccessObjects <>).IsAssignableFromIgnoreGenericParameters(projectionExpression.Type))
{
var elementType = projectionExpression.Type.GetGenericArguments()[0];
var originalPlaceholderCount = 0;
var currentPlaceholderCount = originalPlaceholderCount;
var replacedExpressions = new List <Expression>();
projectionExpression = (SqlProjectionExpression)SqlOuterQueryReferencePlaceholderSubstitutor.Substitute(projectionExpression, ref currentPlaceholderCount, replacedExpressions);
var values = replacedExpressions.Select(c => Expression.Convert(this.Visit(c), typeof(object))).ToList();
var where = projectionExpression.Select.Where;
var typeDescriptor = this.dataAccessModel.TypeDescriptorProvider.GetTypeDescriptor(elementType);
var columns = QueryBinder.GetColumnInfos(this.dataAccessModel.TypeDescriptorProvider, typeDescriptor.PersistedProperties);
var columnExpression = (SqlColumnExpression)SqlExpressionFinder.FindFirst(where, c => c.NodeType == (ExpressionType)SqlExpressionType.Column);
var match = columns.Single(d => d.ColumnName == columnExpression.Name);
var reference = Expression.Call(Expression.Constant(this.dataAccessModel), MethodInfoFastRef.DataAccessModelGetReferenceByValuesMethod.MakeGenericMethod(match.ForeignType.Type), Expression.NewArrayInit(typeof(object), values));
var property = typeDescriptor.GetRelationshipInfos().Single(c => c.ReferencingProperty == match.RootProperty).TargetProperty;
return(Expression.Convert(Expression.Property(reference, property), this.dataAccessModel.GetConcreteTypeFromDefinitionType(property.PropertyType)));
}
else
{
var currentPlaceholderCount = 0;
var replacedExpressions = new List <Expression>();
projectionExpression = (SqlProjectionExpression)SqlOuterQueryReferencePlaceholderSubstitutor.Substitute(projectionExpression, ref currentPlaceholderCount, replacedExpressions);
var newColumnIndexes = projectionExpression.Select.Columns.Select((c, i) => new { c.Name, i }).ToDictionary(d => d.Name, d => d.i);
var savedScope = this.scope;
this.scope = new ProjectionBuilderScope(newColumnIndexes);
var projectionProjector = Expression.Lambda(this.Visit(projectionExpression.Projector), objectProjector, dataReader, versionParameter, dynamicParameters);
this.scope = savedScope;
var values = replacedExpressions.Select(c => (Expression)Expression.Convert(Visit(c), typeof(object))).ToList();
var method = TypeUtils.GetMethod <SqlQueryProvider>(c => c.BuildExecution(default(SqlProjectionExpression), default(LambdaExpression), default(object[])));
MethodInfo evaluate;
if (projectionExpression.Type.GetSequenceElementType() == null)
{
evaluate = MethodInfoFastRef.ExecutionBuildResultEvaluateMethod.MakeGenericMethod(projectionExpression.Type);
}
else
{
evaluate = MethodInfoFastRef.ExecutionBuildResultEvaluateMethod.MakeGenericMethod(typeof(IEnumerable <>).MakeGenericType(projectionExpression.Type.GetSequenceElementType()));
}
return(Expression.Call(Expression.Call(Expression.Property(this.objectProjector, "QueryProvider"), method, Expression.Constant(projectionExpression), projectionProjector, Expression.NewArrayInit(typeof(object), values)), evaluate));
}
}
private ProjectionBuilder(DataAccessModel dataAccessModel, SqlDatabaseContext sqlDatabaseContext, SqlQueryProvider queryProvider, ProjectionBuilderScope scope)
{
this.dataAccessModel = dataAccessModel;
this.sqlDatabaseContext = sqlDatabaseContext;
this.queryProvider = queryProvider;
this.scope = scope;
this.dataReader = Expression.Parameter(typeof(IDataReader), "dataReader");
this.objectProjector = Expression.Parameter(typeof(ObjectProjector), "objectProjector");
this.dynamicParameters = Expression.Parameter(typeof(object[]), "dynamicParameters");
this.versionParameter = Expression.Parameter(typeof(int), "version");
}
private ProjectionBuilder(DataAccessModel dataAccessModel, SqlDatabaseContext sqlDatabaseContext, SqlQueryProvider queryProvider, ProjectionBuilderScope scope)
{
this.dataAccessModel = dataAccessModel;
this.sqlDatabaseContext = sqlDatabaseContext;
this.queryProvider = queryProvider;
this.scope = scope;
this.dataReader = Expression.Parameter(typeof(IDataReader), "dataReader");
this.objectProjector = Expression.Parameter(typeof(ObjectProjector), "objectProjector");
this.dynamicParameters = Expression.Parameter(typeof (object[]), "dynamicParameters");
this.versionParameter = Expression.Parameter(typeof(int), "version");
this.filterParameter = Expression.Parameter(typeof(Func<DataAccessObject, DataAccessObject>), "filter");
}
public static LambdaExpression Build(DataAccessModel dataAccessModel, SqlDatabaseContext sqlDatabaseContext, SqlQueryProvider queryProvider, Expression expression, ProjectionBuilderScope scope, out Expression<Func<IDataReader, object[]>> rootKeys)
{
var projectionBuilder = new ProjectionBuilder(dataAccessModel, sqlDatabaseContext, queryProvider, scope);
var body = projectionBuilder.Visit(expression);
if (projectionBuilder.scope.rootPrimaryKeys.Count > 0)
{
rootKeys = Expression.Lambda<Func<IDataReader, object[]>>(Expression.NewArrayInit(typeof(object), projectionBuilder.scope.rootPrimaryKeys), projectionBuilder.dataReader);
}
else
{
rootKeys = null;
}
return Expression.Lambda(body, projectionBuilder.objectProjector, projectionBuilder.dataReader, projectionBuilder.versionParameter, projectionBuilder.dynamicParameters, projectionBuilder.filterParameter);
}
public static LambdaExpression Build(DataAccessModel dataAccessModel, SqlDatabaseContext sqlDatabaseContext, SqlQueryProvider queryProvider, Expression expression, ProjectionBuilderScope scope)
{
var projectionBuilder = new ProjectionBuilder(dataAccessModel, sqlDatabaseContext, queryProvider, scope);
var body = projectionBuilder.Visit(expression);
return(Expression.Lambda(body, projectionBuilder.objectProjector, projectionBuilder.dataReader, projectionBuilder.versionParameter, projectionBuilder.dynamicParameters));
}
public static LambdaExpression Build(DataAccessModel dataAccessModel, SqlDatabaseContext sqlDatabaseContext, SqlQueryProvider queryProvider, Expression expression, ProjectionBuilderScope scope, out Expression <Func <IDataReader, object[]> > rootKeys)
{
var projectionBuilder = new ProjectionBuilder(dataAccessModel, sqlDatabaseContext, queryProvider, scope);
var body = projectionBuilder.Visit(expression);
if (projectionBuilder.scope.rootPrimaryKeys.Count > 0)
{
rootKeys = Expression.Lambda <Func <IDataReader, object[]> >(Expression.NewArrayInit(typeof(object), projectionBuilder.scope.rootPrimaryKeys), projectionBuilder.dataReader);
}
else
{
rootKeys = null;
}
return(Expression.Lambda(typeof(ObjectReaderFunc <>).MakeGenericType(body.Type), body, projectionBuilder.objectProjector, projectionBuilder.dataReader, projectionBuilder.versionParameter, projectionBuilder.dynamicParameters));
}
protected override Expression VisitProjection(SqlProjectionExpression projectionExpression)
{
if (typeof(RelatedDataAccessObjects<>).IsAssignableFromIgnoreGenericParameters(projectionExpression.Type))
{
var elementType = projectionExpression.Type.GetGenericArguments()[0];
var originalPlaceholderCount = 0;
var currentPlaceholderCount = originalPlaceholderCount;
var replacedExpressions = new List<Expression>();
projectionExpression = (SqlProjectionExpression)SqlOuterQueryReferencePlaceholderSubstitutor.Substitute(projectionExpression, ref currentPlaceholderCount, replacedExpressions);
var values = replacedExpressions.Select(c => Expression.Convert(this.Visit(c), typeof(object))).ToList();
var where = projectionExpression.Select.Where;
var typeDescriptor = this.dataAccessModel.TypeDescriptorProvider.GetTypeDescriptor(elementType);
var columns = QueryBinder.GetColumnInfos(this.dataAccessModel.TypeDescriptorProvider, typeDescriptor.PersistedProperties);
var columnExpression = (SqlColumnExpression)SqlExpressionFinder.FindFirst(where, c => c.NodeType == (ExpressionType)SqlExpressionType.Column);
var match = columns.Single(d => d.ColumnName == columnExpression.Name);
var reference = Expression.Call(Expression.Constant(this.dataAccessModel), MethodInfoFastRef.DataAccessModelGetReferenceByValuesMethod.MakeGenericMethod(match.ForeignType.Type), Expression.NewArrayInit(typeof(object), values));
var property = typeDescriptor.GetRelationshipInfos().Single(c => c.ReferencingProperty == match.RootProperty).TargetProperty;
return Expression.Convert(Expression.Property(reference, property), this.dataAccessModel.GetConcreteTypeFromDefinitionType(property.PropertyType));
}
else
{
var currentPlaceholderCount = 0;
var replacedExpressions = new List<Expression>();
projectionExpression = (SqlProjectionExpression)SqlOuterQueryReferencePlaceholderSubstitutor.Substitute(projectionExpression, ref currentPlaceholderCount, replacedExpressions);
var newColumnIndexes = projectionExpression.Select.Columns.Select((c, i) => new { c.Name, i }).ToDictionary(d => d.Name, d => d.i);
var savedScope = this.scope;
this.scope = new ProjectionBuilderScope(newColumnIndexes);
var projectionProjector = Expression.Lambda(this.Visit(projectionExpression.Projector), objectProjector, dataReader, versionParameter, dynamicParameters, filterParameter);
Expression rootKeys;
if (this.scope.rootPrimaryKeys.Count > 0)
{
rootKeys = Expression.Quote(Expression.Lambda<Func<IDataReader, object[]>>(Expression.NewArrayInit(typeof(object), this.scope.rootPrimaryKeys), this.dataReader));
}
else
{
rootKeys = Expression.Constant(null, typeof(Expression<Func<IDataReader, object[]>>));
}
this.scope = savedScope;
var values = replacedExpressions.Select(c => (Expression)Expression.Convert(Visit(c), typeof(object))).ToList();
var method = TypeUtils.GetMethod<SqlQueryProvider>(c => c.BuildExecution(default(SqlProjectionExpression), default(LambdaExpression), default(object[]), default(Expression<Func<IDataReader, object[]>>)));
MethodInfo evaluate;
if (projectionExpression.Type.GetSequenceElementType() == null)
{
evaluate = MethodInfoFastRef.ExecutionBuildResultEvaluateMethod.MakeGenericMethod(projectionExpression.Type);
}
else
{
evaluate = MethodInfoFastRef.ExecutionBuildResultEvaluateMethod.MakeGenericMethod(typeof(IEnumerable<>).MakeGenericType(projectionExpression.Type.GetSequenceElementType()));
}
return Expression.Call(Expression.Call(Expression.Property(this.objectProjector, "QueryProvider"), method, Expression.Constant(SqlAggregateProjectionNormalizer.Normalize(projectionExpression)), projectionProjector, Expression.NewArrayInit(typeof(object), values), rootKeys), evaluate);
}
}
