我对此做了一些深入研究,但是我不太理解。我在对象上有一个Microsoft.Extensions.Logging.EventId,并且我已经使用Dapper在数据库中保留了EventId。我使用了两列:EventId(int)和EventName(varchar(…))。但是,我不太清楚如何从两个数据库列中填充一个属性对象(EventId)。
我试图操纵我的SQL。
SELECT <snip>…[EventId] AS [EventId.Id],[EventName] AS [EventId.Name] . . .
,但效果如您所料。
所以,这是我的xunit测试:
[Fact]
public async Task EventName_Retrievable()
{
logger.Log(logLevel: LogLevel.Critical,
eventId: new EventId(10, "find me"),
exception: null,
state: "yes please",
formatter: (s, e) =>
{
return e?.Message ?? s;
});
var criteria = new LogQueryCriteria
{
MessageContains = "yes please"
};
var service = new LogQueryService(_fixture.ConnectionString, _factory, _performanceAgent);
var logs = await service.FindLogsAsync(criteria);
Assert.NotEmpty(logs);
Assert.Equal("find me", logs.Last().EventId.Name);
}
证明此功能不起作用:
public async Task<IEnumerable<ILogItemOutbound>> FindLogsAsync(LogQueryCriteria criteria)
{
var pe = _performanceAgent?.Start($"{nameof(LogQueryService)}.{nameof(FindLogsAsync)}", PerformanceTrackingLevel.Low);
if (criteria == null) { criteria = new LogQueryCriteria(); }
IEnumerable<ILogItemOutbound> results = null;
var sql = $@"
{Constants.SELECT_LOGS}{ConstructWhereClause(criteria)} {ConstructOrderByClause(criteria)}
OFFSET {criteria.OffsetValue} ROWS FETCH NEXT {criteria.NumberPerPage} ROWS ONLY;";
using (var connection = new SqlConnection(_connectionString))
{
connection.Open();
results = await connection.QueryAsync<LogItemOutbound, EventId, LogItemOutbound>(sql: sql, commandType: System.Data.CommandType.Text,
map: (logItem, eventId) =>
{
logItem.EventId = eventId;
return logItem;
}
, splitOn: "EventId");
_performanceAgent?.Finish(pe);
}
return results ?? new List<ILogItemOutbound>();
}
您可以看到我试图像这个人一样使用map函数:https://taylorhutchison.github.io/2016/03/23/dapper-orm-complex-queries.html,但是不管我采用哪种方法,Name总是变成NULL。
有人看到我要去哪里了吗?
如果相关,这是我的SQL:
internal const string SELECT_LOGS = @"
SET NOCOUNT ON;
SET DEADLOCK_PRIORITY NORMAL;
SELECT [GlobalId]
,[UtcTimestamp]
,[Message]
,[LogLevel]
,[LogLevelName]
,[Source]
,[UserIdentity]
,[SessionId]
,[EventId]
,[EventName]
FROM [dbo].[Logs]";
总是很乐意提供帮助。
V
答案 0 :(得分:1)
EventName将不会映射到Event.Name
将您的SQL更改为
internal const string SELECT_LOGS = @"
SET NOCOUNT ON;
SET DEADLOCK_PRIORITY NORMAL;
SELECT [GlobalId]
,[UtcTimestamp]
,[Message]
,[LogLevel]
,[LogLevelName]
,[Source]
,[UserIdentity]
,[SessionId]
,[EventId] as Id
,[EventName] as Name
FROM [dbo].[Logs]";
和您的spliton: "Id"