Dapper SqlMapperExtensions/Dapper.Contrib？

Question

似乎有一个DapperExtensions项目,但Dapper项目中还有一个SqlMapperExtensions类.有重叠吗？一个比另一个更受欢迎吗？我在Dapper.Contrib上找不到任何文档.

Answer 1

Dapper.Contrib是程序集名称:https://github.com/StackExchange/Dapper/tree/master/Dapper.Contrib

SqlMapperExtensions是包含contrib方法的静态类Dapper.Contrib:https://github.com/StackExchange/Dapper/blob/master/Dapper.Contrib/SqlMapperExtensions.cs

最好的文档是测试用例类:https://github.com/StackExchange/Dapper/blob/master/Dapper.Tests.Contrib/TestSuite.cs

Answer 2

在与 Sam 讨论之后，我很久以前写了第一个 Dapper.Contrib。我不知道扩展包的细节，它们似乎或多或少地做相同的 CRUD 事情，但 Contrib 包在某些情况下可能会更快一些，因为它具有用于查询和接口的内置缓存具有内部“脏”跟踪的基于 POCO。从测试代码中截取：

        using (var connection = GetOpenConnection())
        {
            connection.Get<User>(3).IsNull();

            var id = connection.Insert(new User {Name = "Adam", Age = 10});

            //get a user with "isdirty" tracking
            var user = connection.Get<IUser>(id);
            user.Name.IsEqualTo("Adam");
            connection.Update(user).IsEqualTo(false);    //returns false if not updated, based on tracking
            user.Name = "Bob";
            connection.Update(user).IsEqualTo(true);    //returns true if updated, based on tracking
            user = connection.Get<IUser>(id);
            user.Name.IsEqualTo("Bob");

            //get a user with no tracking
            var notrackedUser = connection.Get<User>(id);
            notrackedUser.Name.IsEqualTo("Bob");
            connection.Update(notrackedUser).IsEqualTo(true);   //returns true, even though user was not changed
            notrackedUser.Name = "Cecil";
            connection.Update(notrackedUser).IsEqualTo(true);
            connection.Get<User>(id).Name.IsEqualTo("Cecil");

            connection.Query<User>("select * from Users").Count().IsEqualTo(1);
            connection.Delete(user).IsEqualTo(true);
            connection.Query<User>("select * from Users").Count().IsEqualTo(0);

            connection.Update(notrackedUser).IsEqualTo(false);   //returns false, user not found

Contrib 没有像 Extensions 那样漂亮的谓词系统。注意Dapper.Contrib 这里有一个很好的线程Dapper.Rainbow VS Dapper.Contrib