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Typesafe dynamic filtering/ordering/paging

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Issue 类型
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基本清楚
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技术栈
fsharp, sql

调研方向

该 issue 未指明 repository 文件或测试。首先定位此处描述的 SQL... 生成类型路径,并跟踪输出列的暴露方式。完成标准是:符合条件的单 SELECT 查询支持类型安全的 By 值、排序、分页,以及一个保留所应用子句的命令。

由索引模型根据 Issue 内容生成。

描述

enhancement

Right now there is no way to dynamically order queries.

This makes the library unsuitable for applications that let the user sort a paged table of records.
That's a lot of applications!

This should be solvable without giving up type safety. Here's the design I have in mind:

Any command that consists of a single SELECT statement which is not known to be a single-row SELECT should be dynamically orderable.

e.g.

type MyQuery = SQL<"select Column1, 1+1 as Column2 from SomeTable">

This means that it gets the following extra stuff in its generated type:

  • A nested type MyQuery.By with a private constructor and an overrided ToString().
  • Static getters MyQuery.By.Column1 and MyQuery.By.Column2, which return instances of MyQuery.By
  • A static method MyQuery.By.OfString("Column1") which checks that the passed string is one of the statically known output column names. MyQuery.By.OfString(MyQuery.By.Column2.ToString()) should work.
  • A static OrderBy method taking a MyQuery.By and a DU Ascending|Descending and returning a MyQuery.OrderedQuery
  • MyQuery.OrderedQuery has an instance method ThenBy taking another by+direction, Page taking limit+offset
  • MyQuery.OrderedQuery has an instance Command method which is like the regular MyQuery.Command(param1 = ...) method, but includes the orderings applied so far

Hypothetical usage:

type MyQuery = SQL<"select Column1, 1+1 as Column2 from SomeTable where Name like @name">

let example (conn : ConnectionContext) =
    MyQuery
        .OrderBy(MyQuery.By.Column1, Ascending)
        .ThenBy(MyQuery.By.Column2, Descending)
        .Page(25, 50)
        .Command(name = "%a%")
        .Execute(conn)

I think it would be OK to limit to one ThenBy clause. Orderings more complicated than that don't make much sense to generate dynamically.

Thoughts?

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