相关疑难解决方法(0)

如何对数据库执行插入并使用Dapper返回插入的标识？

我尝试过这样的事情:

string sql = "DECLARE @ID int; " +
             "INSERT INTO [MyTable] ([Stuff]) VALUES (@Stuff); " +
             "SELECT @ID = SCOPE_IDENTITY()";

var id = connection.Query<int>(sql, new { Stuff = mystuff}).First();

但它没有用.

@Marc Gravell谢谢你的回复.我已经尝试过你的解决方案但是,下面仍有相同的异常跟踪

System.InvalidCastException: Specified cast is not valid

at Dapper.SqlMapper.<QueryInternal>d__a`1.MoveNext() in (snip)\Dapper\SqlMapper.cs:line 610
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at Dapper.SqlMapper.Query[T](IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Boolean buffered, Nullable`1 commandTimeout, Nullable`1 commandType) in (snip)\Dapper\SqlMapper.cs:line 538
at Dapper.SqlMapper.Query[T](IDbConnection cnn, String sql, Object param) in (snip)\Dapper\SqlMapper.cs:line 456

我在 ASP.net Identity 项目中使用 dapper 和 MySql 时遇到问题。我想将用户插入到表 users 并希望从此插入中自动生成的 id 返回。但是我收到一个语法错误，我不知道为什么。

这是我的方法插入代码：

public void Insert(TUser member)
        {
            var id = db.Connection.ExecuteScalar<int>(@"Insert into users
                                    (UserName,  PasswordHash, SecurityStamp,Email,EmailConfirmed,PhoneNumber,PhoneNumberConfirmed, AccessFailedCount,LockoutEnabled,LockoutEndDateUtc,TwoFactorEnabled)
                            values  (@name, @pwdHash, @SecStamp,@email,@emailconfirmed,@phonenumber,@phonenumberconfirmed,@accesscount,@lockoutenabled,@lockoutenddate,@twofactorenabled)
                            SELECT Cast(LAST_INSERT_ID() as AS UNSIGNED INTEGER)",
                              new
                              {
                                  name = member.UserName,
                                  pwdHash = member.PasswordHash,
                                  SecStamp = member.SecurityStamp,
                                  email = member.Email,
                                  emailconfirmed = member.EmailConfirmed,
                                  phonenumber = member.PhoneNumber,
                                  phonenumberconfirmed = member.PhoneNumberConfirmed,
                                  accesscount = member.AccessFailedCount,
                                  lockoutenabled = member.LockoutEnabled,
                                  lockoutenddate = member.LockoutEndDateUtc,
                                  twofactorenabled = member.TwoFactorEnabled
                              });
            // we need to set the …