Question

我了解到在sqlite中启用FK约束的唯一方法是启用此编译指示：

PRAGMA foreign_keys = ON;

但不幸的是，如果我理解正确，我将不得不在每个会话开始时执行该查询。我对么？我怎么能用NHibernate“自动”做到这一点？有没有办法挂钩NH并在打开会话后立即执行？我正在使用NH 3.0。

Answer 1

好的，我找到了适合我的答案。积分归James Kovacs所有（similar question）

我已经基于SQLite20Driver创建了自己的驱动程序并重载了CreateConnection方法（代码来自James' GitHub）

public override IDbConnection CreateConnection()
    {
        DbConnection connection = (DbConnection)base.CreateConnection();
        connection.StateChange += Connection_StateChange;
        return connection;
    }

    private static void Connection_StateChange(object sender, StateChangeEventArgs e)
    {
        if ((e.OriginalState == ConnectionState.Broken || e.OriginalState == ConnectionState.Closed || e.OriginalState == ConnectionState.Connecting) &&
            e.CurrentState == ConnectionState.Open)
        {
            DbConnection connection = (DbConnection)sender;
            using (DbCommand command = connection.CreateCommand())
            {
                // Activated foreign keys if supported by SQLite.  Unknown pragmas are ignored.
                command.CommandText = "PRAGMA foreign_keys = ON";
                command.ExecuteNonQuery();
            }
        }
    }

像魅力一样：）。

在nhibernate中启用SQLite foreignkeys

1 个答案: