我如何在linq2db中管理多个数据库

Question

我想在我的应用程序中管理多个数据库连接。我正在使用ASP.NET Core和linq2db。对于我的第一个数据库连接，我创建了以下配置，并且工作正常。

public class DatabaseXSettings : ILinqToDBSettings
{
    public IEnumerable<IDataProviderSettings> DataProviders
    {
        get { yield break; }
    }

    public string DefaultConfiguration => "Oracle.Managed";
    public string DefaultDataProvider => "Oracle.Managed";

    public string ConnectionString { get; set; }

    public DatabaseXSettings(string connectionString)
    {
        ConnectionString = connectionString;
    }

    public IEnumerable<IConnectionStringSettings> ConnectionStrings
    {
        get
        {
            yield return
            new ConnectionStringSettings
            {
                Name = "DatabaseX",
                ProviderName = "Oracle.Managed",
                ConnectionString = ConnectionString
            };
        }
    }
}

public static class DatabaseXStartup
{
    private static bool _started;
    public static void Init(string connectionString)
    {
        if (!_started)
        {
            DataConnection.DefaultSettings = new DatabaseXSettings(connectionString);
           _started = true;
        }
    }
}

public class DatabaseX : DataConnection
{
    public DatabaseX() : base("DatabaseX") { }
}

对于我的第二个数据库

对于第二个数据库连接，我创建类似的配置。但这不起作用。

public class DatabaseYSettings : ILinqToDBSettings
{
    ....... 
}

public static class DatabaseYStartup
{
    .......
}


public class DatabaseY : DataConnection
{
    public DatabaseY() : base("DatabaseY") { }
}

我的appsettings.json

  {
"Logging": {
    "LogLevel": {
        "Default": "Warning"
    }
},
"AllowedHosts": "*",
"ConnectionStrings": {
    "DatabaseX": "Data Source=..........",
    "DatabaseY": "Data Source=.........."
}

}

LinqToDB.LinqToDBException：'配置'DatabaseY'未定义。'

还有其他方法可以做到这一点。

Answer 1

编辑：添加了示例

您不需要两个ILinqToDBSettings实例。您应该将第二个数据库设置移到第一个设置类，以便ConnectionStrings将返回两个连接字符串。

public class DatabaseSettings : ILinqToDBSettings
{
    public IEnumerable<IDataProviderSettings> DataProviders
    {
        get { yield break; }
    }

    public string DefaultConfiguration => "Oracle.Managed";
    public string DefaultDataProvider => "Oracle.Managed";

    private readonly IConnectionStringSettings[] _connectionStrings;

    public DatabaseSettings(IConnectionStringSettings[] connectionStrings)
    {
        _connectionStrings = connectionStrings;
    }

    public IEnumerable<IConnectionStringSettings> ConnectionStrings => _connectionStrings;
}

public static class DatabaseSetup
{
    // just call it on application startup
    public static void Init()
    {
        // create connectionStrings collection with both connection strings from appsettings.json

        DataConnection.DefaultSettings = new DatabaseSettings(connectionStrings);
    }
}