public static IEnumerable <T> DeleteObjectByObjectWhere <T>(this DataAccessObjectsQueryable <T> queryable, Expression <Func <T, bool> > condition)
where T : DataAccessObject
{
if (queryable.ExtraCondition != null)
{
var parameter = Expression.Parameter(typeof(T), "value");
var body = Expression.AndAlso(condition.Body, queryable.ExtraCondition);
condition = Expression.Lambda <Func <T, bool> >(body, parameter);
}
foreach (T value in queryable.Where(condition))
{
value.Delete();
yield return(value);
}
}
public static void DeleteWhere <T>(this DataAccessObjectsQueryable <T> queryable, Expression <Func <T, bool> > condition)
where T : DataAccessObject
{
queryable.DataAccessModel.Flush();
var transactionContext = queryable.DataAccessModel.AmbientTransactionManager.GetCurrentContext(true);
using (var acquisition = transactionContext.AcquirePersistenceTransactionContext(queryable.DataAccessModel.GetCurrentSqlDatabaseContext()))
{
var expression = (Expression)Expression.Call(null, MethodCache <T> .DeleteMethod, Expression.Constant(queryable, typeof(DataAccessObjectsQueryable <T>)), condition);
expression = Evaluator.PartialEval(expression);
expression = QueryBinder.Bind(queryable.DataAccessModel, expression, queryable.ElementType, queryable.ExtraCondition);
expression = ObjectOperandComparisonExpander.Expand(expression);
expression = SqlQueryProvider.Optimize(expression, transactionContext.SqlDatabaseContext.SqlDataTypeProvider.GetTypeForEnums());
acquisition.SqlDatabaseCommandsContext.Delete((SqlDeleteExpression)expression);
}
}
public static IQueryable <R> SelectForUpdate <T, R>(this DataAccessObjectsQueryable <T> queryable, Expression <Func <T, R> > condition)
where T : DataAccessObject
{
return(queryable.PersistenceQueryProvider.CreateQuery <R>(Expression.Call(null, ((MethodInfo)MethodBase.GetCurrentMethod()).MakeGenericMethod(typeof(T)), Expression.Constant(queryable), condition)));
}