public object Execute(Expression expression)
{
TranslateResult result = this.Translate(expression);
if (result.SQLCommand != null)
{
this.misession.Do(result.SQLCommand);
}
Type elementType = TypeSystem.GetElementType(expression.Type);
IDataReader reader = this.readerfactory.GetReaderFor(result.TableName);
EntityMaterializer materializer = this.entityfactory.CreateMaterializerFor(result.TableName, reader);
if (result.Projector != null)
{
Delegate projector = result.Projector.Compile();
return(Activator.CreateInstance(typeof(ProjectionReader <>).MakeGenericType(elementType),
new object[] { reader, projector }));
}
else
{
return(Activator.CreateInstance(typeof(RowList <>).MakeGenericType(elementType),
new object[] { reader, materializer }));
}
}
public EntityQueryExecutor(DataContext context)
{
_context = context;
_connection = context.Database.Connection;
//_transaction = transaction;
_materializer = new EntityMaterializer(context);
}
public virtual EntityMaterializer CreateEntityMaterializer(DbTableInfo table, IList <DbColumnInfo> columns)
{
var matzr = new EntityMaterializer(table);
foreach (var col in columns)
{
matzr.AddColumn(col);
}
return(matzr);
}
// RI: new stuff, optimized entity reader
protected virtual Expression GetOutputTableReader(TableExpression tableExpression,
ParameterExpression dataRecordParameter, ParameterExpression sessionParameter,
TranslationContext context)
{
// Note: we have to create materializer each time, because column indexes in output can change from query to query
var entMatzer = new EntityMaterializer(tableExpression.TableInfo);
var allColExprs = RegisterAllColumns(tableExpression, context);
foreach (var col in allColExprs)
{
var colIndex = RegisterOutputValue(col, context);
entMatzer.AddColumn(col.ColumnInfo, colIndex);
}
var entMatzerConst = Expression.Constant(entMatzer);
var callReadEntity = Expression.Call(entMatzerConst, EntityMaterializer.ReadMethodInfo, dataRecordParameter, sessionParameter);
var convExpr = Expression.Convert(callReadEntity, tableExpression.Type);
return(convExpr);
}
public RowEnumerator(IDataReader recordSelector, EntityMaterializer entityFactory)
{
this.datareader = recordSelector;
this.entityfactory = entityFactory;
}
public RowList(IMapInfoDataReader reader, EntityMaterializer factory)
{
this.reader = reader;
this.entityfactory = factory;
}
