Question

模型（用于多对多关系的公开映射表）：

 public class TeamUsers
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public long TeamUsersId { get; set; }

    public Team Team { get; set; }
    public User User { get; set; }

    public bool Temporary { get; set; }
}

远程和本地查询的两种常规方法：

getAllOfTypeSelectRemote = function (manager, success, failed, resource, orderBy, predicate, select) {
            var query = EntityQuery
                .from(resource)
                .where(predicate)
                .using(manager)
                .select(select)   //<------
                .orderBy(orderBy);
            return query.execute()
                .then(success)
                .fail(failed);
        },

getAllOfTypeSelectLocally = function (manager, resource, orderBy, predicate, select) {
            var res = null;
            try {
                res = EntityQuery
                .from(resource)
                .where(predicate)
                .select(select)   //<-----
                .orderBy(orderBy)
                .using(manager)
                .executeLocally();
            } catch (e) {
                logger.error('resource: ' + resource + '<br>select: ' + select + '<br>orderBy:' + orderBy, 'Local query failed!');
            }
            return res;
        };

这样叫：

var selectStr = 'User'; //<------

            var p1 = new breeze.Predicate("Team.TeamName", Qop.Equals, team);
            var p2 = breeze.Predicate("User.UserName", Qop.NotEquals, username);
            var predicate = p1.and(p2);

            //var res = dsUtils.getAllOfTypeSelectRemote(manager, success, queryFailed, 'TeamUsers', 'User.Nachname, User.Vorname', p1, select);
            var res = dsUtils.getAllOfTypeSelectLocally(manager, 'TeamUsers', 'User.Nachname, User.Vorname', p1, selectStr);

远程查询返回一个User-Entities数组，我相信这是正确的。将'selectStr'修改为无效类型（如'bla'）会按预期引发异常。结果：

data.results = [{"User": {...}}, {"User": {...}}]

本地查询只是忽略了select并返回一个TeamUser数组结果：

res=[{ Here are the fields of TeamUsers }, { Here are the fields of TeamUsers }]

将'selectStr'修改为像'bla'这样的无效类型会抛出NO异常。为什么选择省略，这应该是那样的吗？

Answer 1

从v 0.74.3开始，这应该是固定的;现在，本地查询以及远程查询将正确解释select子句。希望这可以帮助。

Local Query使用“select”省略/忽略投影

1 个答案: