无法使用 ADO 在 MS SQL Express 服务器上开始事务

Cannot begin transaction on MS SQL Express server with ADO

我想从 C++ 更新 MS SQL 数据库中的一些行。问题是,我无法创建交易。每次我尝试执行 Ado::Connection::BeginTrans 我都会得到一个错误:

A request to establish a connection with the transaction manager was denied.

我在本地计算机 (Win 10 Pro) 上安装了 SQL Server 2017 Express Edition 的新副本,并创建了一个名为 test.

的新数据库

连接字符串:

Provider=SQLNCLI11;Server=SNAIL\SQLEXPRESS;Database=test;Trusted_Connection=yes; 

我应该怎么做才能摆脱这个错误?

编辑:

部分源码:

#import <msado15.dll> rename_namespace("ADO2"), raw_interfaces_only, raw_native_types, named_guids, no_smart_pointers

const auto connection_string = L"Provider=sqloledb;Data Source=SNAIL\SQLEXPRESS;Initial Catalog=test;Integrated Security=SSPI";

// create connection
Ref<ADO2::_Connection> m_DbConnection;
m_DbConnection->put_Mode(ADO2::adModeReadWrite);
m_DbConnection->put_ConnectionTimeout(5);
m_DbConnection->Open(connection_string, nullptr, nullptr, ADO2::adConnectUnspecified)


class InAdoTransaction {
private:
    Ref<ADO2::_Connection>  m_DbConnection;
    bool m_Commited;

public:
    InAdoTransaction(ADO2::_Connection *Connection) {
        m_DbConnection = Connection;
        m_Commited = false;

        long transaction_level;
        HRESULT er = m_DbConnection->BeginTrans(&transaction_level);
        ASSERT(er == S_OK);
    }

    ~InAdoTransaction() {
        if (!m_Commited) {
            Rollback();
        }
    }

    void Rollback() {
        m_DbConnection->RollbackTrans();
    }

    void Commit() {
        m_DbConnection->CommitTrans();
        m_Commited = true;
    }
};


// usage
HRESULT FUNC StoreMetadata()
{
    HRESULT er = S_OK;

    Ref<ADO2::_Recordset> rst;

    InAdoTransaction transaction(m_DbConnection);

    if (FAILED(m_DbConnection->Execute(QUERY_TRUNCATE_METADATA_TABLE, nullptr, 0, OUT(rst)))) {
        return E_CANNOT_STORE_METADATA;
    }

    ...

    transaction.Commit();
}

我终于找到了解决办法。整个问题出在我在表 INFORMATION_SCHEMA.TABLESINFORMATION_SCHEMA.VIEWS 上创建的记录集中。此记录集的锁定类型设置为 LockType::adLockReadOnly,这导致了问题。我已将其更改为 LockType::adLockOptimistic,现在一切正常。

但是,提供者 returns 如此具有误导性的错误消息令人遗憾。