/// <summary>
/// 是否存在记录
/// </summary>
/// <param name="context">上下文</param>
/// <returns></returns>
public bool Exists(QueryDescriptor <T> context)
{
Sql s = Sql.Builder.Append("SELECT TOP 1 1 AS result FROM [" + MetaData.TableInfo.TableName + "] ")
.Append(PocoHelper.GetConditions(context));
ExecuteContext <T> ctx = new ExecuteContext <T>(s);
var result = _repository.Exists(ctx);
return(result);
}
/// <summary>
/// 删除记录
/// </summary>
/// <param name="predicate">过滤条件</param>
/// <returns></returns>
public bool Delete(Expression <Func <T, bool> > predicate)
{
QueryDescriptor <T> q = QueryDescriptorBuilder.Build <T>();
q.Where(predicate);
Sql s = Sql.Builder.Append("DELETE [" + MetaData.TableInfo.TableName + "] ")
.Append(PocoHelper.GetConditions(q.QueryText, q.Parameters));
ExecuteContext <T> ctx = new ExecuteContext <T>(s);
var result = _repository.DeleteByQuery(ctx);
return(result);
}