INSERT语句后@@ IDENTITY始终返回0

我需要一个函数,它在数据库上执行INSERT语句并返回Auto_Increment主键.我有以下C#代码但是,虽然INSERT语句工作正常(我可以看到数据库中的记录,PK是正确生成的,行== 1),但id值始终为0.任何关于可能会发生什么的想法错误？

    public int ExecuteInsertStatement(string statement)
    {
        InitializeAndOpenConnection();
        int id = -1;


        IDbCommand cmdInsert = connection.CreateCommand();
        cmdInsert.CommandText = statement;
        int rows = cmdInsert.ExecuteNonQuery();

        if (rows == 1)
        {
            IDbCommand cmdId = connection.CreateCommand();
            cmdId.CommandText = "SELECT @@Identity;";
            id = (int)cmdId.ExecuteScalar();
        }

        return id;
    }
    private void InitializeAndOpenConnection()
    {
        if (connection == null)
            connection = OleDbProviderFactory.Instance.CreateConnection(connectString);

        if(connection.State != ConnectionState.Open)                 
            connection.Open();
    }

为了回答答案,我试过:

public int ExecuteInsertStatement(string statement, string tableName)
    {
        InitializeAndOpenConnection();
        int id = -1;
        IDbCommand cmdInsert = connection.CreateCommand();
        cmdInsert.CommandText = statement + ";SELECT OID FROM " + tableName + " WHERE OID = SCOPE_IDENTITY();";
        id = (int)cmdInsert.ExecuteScalar();

        return id;
    }

但我现在收到错误"SQL语句结束后找到的字符"

我正在使用具有OleDb连接的MS Access数据库,Provider = Microsoft.Jet.OLEDB.4.0

1)将INSERT和SELECT语句(使用";"连接)组合成1 db命令

2)使用SCOPE_IDENTITY()代替@@ IDENTITY

INSERT INTO blabla ......; SELECT OID FROM表WHERE OID = SCOPE_IDENTITY()

- 更新:

事实证明这个问题与MS ACCESS有关,我发现这篇文章表明只需重用第一个命令并将其CommandText设置为"SELECT @@ IDENTITY"即可.

Microsoft.Jet.OLEDB.4.0提供程序支持Jet v3和Jet v4数据库引擎,但Jet v3不支持SELECT @@ IDENTITY.

MSAccess 97是Jet v3,不支持SELECT @@ IDENTITY; 它支持MSAccess 2000及更高版本.