Npgsql:INSERT命令不插入

问题是:

NpgsqlCommand.Text:插入mytable(id,name)值(:id,:name)
参数1:name=id,value=42
参数2:name=name,value=whatever

command.ExecuteScalar() 没有失败,但没有新行。也没有重复的id。

using (var command = connection.CreateCommand()) {
    command.Transaction = transaction;
    command.CommandText = "INSERT INTO mytable (id, name) VALUES (:id, :name)";       

    var idParameter = command.CreateParameter();
    idParameter.Direction = ParameterDirection.Input;
    idParameter.DbType = DbType.Int32;
    idParameter.ParameterName = "id";
    idParameter.Value = 42;
    command.Parameters.Add( idParameter );

    var nameParameter = command.CreateParameter();
    nameParameter.Direction = ParameterDirection.Input;
    nameParameter.DbType = DbType.String;
    nameParameter.ParameterName = "name";
    nameParameter.Value = "whatever";
    command.Parameters.Add( nameParameter );

    command.ExecuteScalar();
}

上面的代码不是真正的代码。我不得不从几个DAL类中收集它来线性化它。。。
当然,事务是在该代码之前创建的,之后提交。

CREATE TABLE mytable
(
    "name" character varying NOT NULL,
    id integer NOT NULL,
    CONSTRAINT mytable_pkey PRIMARY KEY (id)
)
WITH (
    OIDS=FALSE
);
ALTER TABLE mytable OWNER TO myuser;

问题:

• 胡?

结果是: