Dapper 和 Postgres - 打印查询

Question

我在 Postgres 中使用 Dapper，我想记录一些诊断信息，尤其是正在运行的实际查询。

如果我使用的是 SQL Server，我会这样做

let connection = new SqlConnection(connectionString)
connection.StatisticsEnabled = true

// run query 

let stats = connection.RetrieveStatistics()

但我似乎找不到类似的东西NpgsqlConnection。

检索正在运行的实际查询的最佳方法是NpgsqlConnection什么？

Answer 1

我能够通过创建 NpgSql 日志记录提供程序来打印查询，如here所述。

type SqlLogger (logger: ILogger) =

    inherit NpgsqlLogger() with

        let mapLogLevel level =
            match level with
            | NpgsqlLogLevel.Trace -> LogLevel.Debug
            | NpgsqlLogLevel.Debug -> LogLevel.Debug
            | NpgsqlLogLevel.Info ->  LogLevel.Information
            | NpgsqlLogLevel.Warn ->  LogLevel.Warning
            | NpgsqlLogLevel.Error -> LogLevel.Error
            | NpgsqlLogLevel.Fatal -> LogLevel.Critical
            | _ -> LogLevel.Debug


        override __.IsEnabled(_level : NpgsqlLogLevel) = true
        override __.Log(level, connectorId, msg, ex) =
            let level = mapLogLevel level               
            logger.Log(level, ex, msg)


type SqlLoggerProvider (loggerFactory: ILoggerFactory ) =
    member __.loggerFactory = loggerFactory
    interface INpgsqlLoggingProvider with
        member __.CreateLogger(name) = loggerFactory.CreateLogger(name) |> SqlLogger :> NpgsqlLogger

然后像这样注册它：

let configureApp (app : IApplicationBuilder) =    
    NpgsqlLogManager.Provider <- SqlLoggerProvider (app.ApplicationServices.GetService<ILoggerFactory>())
    NpgsqlLogManager.IsParameterLoggingEnabled <- true