Question

我有2个表CampaignCoverage和Coverage

CampaignCoverage有一个CoverageID列。覆盖范围有一列DateX。

基本上我没有在代码中指定CampaignCoverage.CoverageID = Coverage.ID就像你在SQL中那样。这是怎么回事???? !!!!

CampaignCoverageCollection campaignCoverages = 
    new Select()
        .From(Tables.CampaignCoverage)
        .InnerJoin(Tables.Coverage)                               
        .Where(Coverage.DateXColumn).IsGreaterThan(ucDateStart.DateTime)
        .And(Coverage.DateXColumn).IsLessThan(ucDateEnd.DateTime)
        .And(CampaignCoverage.CampaignIDColumn).IsEqualTo(campaign.Id)
        .ExecuteAsCollection<CampaignCoverageCollection>();

Answer 1

如果你没有指定CampaignCoverage.CoverageID是Coverage.ID的外键（我认为这就是你想说的话），那么摆脱连接应该可以解决问题。即删除

.InnerJoin(Tables.Coverage)

也就是说，您可能希望将CampaignCoverage.CoverageID设为Coverage.ID的外键。执行此操作后，您可以删除IsEqualTo子句。即删除

.And(CampaignCoverage.CampaignIDColumn).IsEqualTo(campaign.Id)

SubSonic内部连接之谜

1 个答案: