petapoco 中的一对多关系
我有三个表
Company、CompanyLevel、CompanyType
Company 与 CompanyLevel 和 CompanyType 具有一对多关系
我使用以下查询来获取 Company 和 CompanyLevel
db.FetchOneToMany<Company, CompanyLevel>(x => x.CompanyId,
Sql.Builder.Append("SELECT CS.*, CL.* FROM Company AS CS").Append(
"LEFT OUTER JOIN [CompanyLevel] AS CL ON CS.CompanyId = CL.CompanyId")
其中 db 是 petapoco 的数据库实例。
是否可以在此查询中包含另一个关系（CompanyType），或者我们如何在查询中包含多个一对多关系。
我正在使用 Petapoco 扩展关系类。
I have three tables
Company, CompanyLevel, CompanyType
Company is having one to many relationship with CompanyLevel and CompanyType
I used following query to get Company and CompanyLevel
db.FetchOneToMany<Company, CompanyLevel>(x => x.CompanyId,
Sql.Builder.Append("SELECT CS.*, CL.* FROM Company AS CS").Append(
"LEFT OUTER JOIN [CompanyLevel] AS CL ON CS.CompanyId = CL.CompanyId")
Where db is a database instance of petapoco.
Is it possible to include one more relationship (CompanyType) in this query or how we can include multiple one to many relationship in queries.
I am using Petapoco extension relationship class.
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您一次只能执行 1 个操作。如果您开始执行多个操作，那么您将返回比实际需要的更多结果。将查询拆分为多个查询可能会更好。
You can only do 1 onetomany at a time. If you start doing more than one, then you will be returning way to many results than is actually needed. Its probably then better to split up the query into multiple queries.