Question

我正试图在精巧的时候使用TVP来一次插入几行：

                con.Execute(@"
INSERT INTO Author (
    FirstName,
    LastName,
    ParentAuthor
)
SELECT
    FirstName,
    LastName,
    ParentAuthor
FROM @TVP
"
                    , new[]
                    {
                        new Author { FirstName = "Roger", LastName = "Smith", ParentAuthor = 1},
                        new Author { FirstName = "Stan", LastName = "Smith"},
                        new Author { FirstName = "Haley", LastName = "Smith"},
                        new Author { FirstName = "Francine", LastName = "Ling"}
                    } // .AsTableValuedParameter() => not working
                );

但是有没有一种方便的方法将对象集合转换为TableValuedParameter？

Answer 1

我发现了fast-member，然后就可以这样做了：

                var items = new[]
                {
                    new Author {FirstName = "Roger", LastName = "Smith", ParentAuthor = 1},
                    new Author {FirstName = "Stan", LastName = "Smith"},
                    new Author {FirstName = "Haley", LastName = "Smith"},
                    new Author {FirstName = "Francine", LastName = "Ling"}
                };

                var table = new DataTable();
                using (var reader = ObjectReader.Create(
                    items,
                    nameof(Author.FirstName),
                    nameof(Author.LastName),
                    nameof(Author.ParentAuthor)
                ))
                {
                    table.Load(reader);
                }

                con.Execute(@"
INSERT INTO Author (
    FirstName,
    LastName,
    ParentAuthor
)
SELECT
    FirstName,
    LastName,
    ParentAuthor
FROM @TVP
"
                    , new { TVP = table.AsTableValuedParameter("TVP_Author") }
                );

如果有一个类似的功能内置精致，我仍然想知道。

使用Dapper将对象集合转换为TableValuedParameter

1 个答案: