[英]How to get output parameter results and query result from stored procedure?
I have this stored procedure我有这个存储过程
CREATE PROCEDURE UpdateWeatherReport (
@TemperatureData VARCHAR(100),
@StationID VARCHAR(7),
@ErrorCode INT OUTPUT,
@ErrorMessage VARCHAR(200) OUTPUT
)
AS
BEGIN
SET @ErrorCode=12;
SET @ErrorMessage='test error message';
DECLARE @PredictionValid BIT = 'true'
DECLARE @ExpiryDays TINYINT = 2
SELECT
@PredictionValid AS [PredictionValid]
,@ExpiryDays AS [ExpiryDays]
END
which I call from C# using Entity Framework Core using a DbContext我使用 Entity Framework Core 使用 DbContext 从 C# 调用
var pTemperatureData = new SqlParameter("@TemperatureData", System.Data.SqlDbType.VarChar) { Value = "...", Direction = System.Data.ParameterDirection.Input };
var pStationID = new SqlParameter("@StationID", System.Data.SqlDbType.VarChar) { Value = "...", Direction = System.Data.ParameterDirection.Input };
var pErrorCode = new SqlParameter("@ErrorCode", System.Data.SqlDbType.Int) { Direction = System.Data.ParameterDirection.Output };
var pErrorMessage = new SqlParameter("@ErrorMessage", System.Data.SqlDbType.Int, size: 200) { Direction = System.Data.ParameterDirection.Output };
var sql = $"EXECUTE {name} ";
parameters.ForEach(p => sql += $"{p.ParameterName},");
sql = sql.TrimEnd(',');
//"EXECUTE UpdateWeatherReport @TemperatureData, @StationID, @ErrorCode, @ErrorMessage"
await Context.Database.ExecuteSqlRawAsync(sql, parameters.ToArray());
pErrorCode.Value; <-------------------- empty after call to stored procedure
pErrorMessage.Value; <----------------- empty after call to stored procedure
When I call the SP from code, the output parameters are empty.当我从代码中调用 SP 时,output 参数为空。 How to get the output parameter values in code?
如何在代码中获取 output 参数值?
When I call the SP directly from SQL the output parameters are populated correctly.当我直接从 SQL 调用 SP 时,正确填充了 output 参数。
DECLARE @TemperatureData VARCHAR(100)='abc 123 def 456 ...';
DECLARE @StationID VARCHAR(7)='19372';
DECLARE @ErrorCode INT;
DECLARE @ErrorMessage VARCHAR(200);
EXEC UpdateWeatherReport @ParcelBarcode, @StationID, @ParcelStatus, @DateDelivered, @PickupCode, @ErrorCode OUTPUT, @ErrorMessage OUTPUT;
You're missing the OUTPUT
keyword when building the parameters in the SQL text:在 SQL 文本中构建参数时,您缺少
OUTPUT
关键字:
EXECUTE UpdateWeatherReport @TemperatureData, @StationID, @ErrorCode, @ErrorMessage
Should be:应该:
EXECUTE UpdateWeatherReport @TemperatureData, @StationID, @ErrorCode OUTPUT, @ErrorMessage OUTPUT
You can fix that by modifying the line where you add the parameters to the SQL text:您可以通过修改将参数添加到 SQL 文本的行来解决此问题:
parameters.ForEach(p => sql += $"{p.ParameterName}{(p.Direction == System.Data.ParameterDirection.Output ? " OUTPUT" : string.Empty)},");
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