我有一个存储过程。对它的调用返回-1。这是什么意思？
以下是调用存储过程的代码（由Entity Framework自动生成）：
public virtual int DeleteProjectData(Nullable<int> projectId, string deleteType, string username)
{
var projectIdParameter = projectId.HasValue ?
new ObjectParameter("projectId", projectId) :
new ObjectParameter("projectId", typeof(int));
var deleteTypeParameter = deleteType != null ?
new ObjectParameter("deleteType", deleteType) :
new ObjectParameter("deleteType", typeof(string));
var usernameParameter = username != null ?
new ObjectParameter("username", username) :
new ObjectParameter("username", typeof(string));
int result = ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction("DeleteProjectData",
projectIdParameter, deleteTypeParameter, usernameParameter);
return result; // result is -1
}
这是存储过程：
ALTER PROCEDURE [dbo].[DeleteProjectData]
@projectId INT,
@deleteType VARCHAR(10),
@username NVARCHAR(255)
AS
SET NOCOUNT ON
BEGIN TRY
DECLARE @realProjectId INT = NULL,
@isTemplate BIT,
@ErrorMessage NVARCHAR(4000),
@deleteTypeAll VARCHAR(10),
@deleteTypeNodes VARCHAR(10)
DECLARE @usernameBinary VARBINARY(255)
SET @usernameBinary = CAST(@username AS VARBINARY(255))
SET CONTEXT_INFO @usernameBinary
SELECT @deleteTypeAll = 'All',
@deleteTypeNodes = 'Nodes'
-- ensure the input project exists and is not a template
SELECT @realProjectId = ProjectId
FROM Project
WHERE ProjectId = @projectId
IF @deleteType NOT IN (@deleteTypeAll, @deleteTypeNodes)
BEGIN
-- create a the error message for a project that does not exist
SELECT @ErrorMessage = N'The input Delete Type is not valid. Valid values are: ''' + @deleteTypeAll
+ ''' and ''' + @deleteTypeNodes + ''''
-- raise the error
RAISERROR (@ErrorMessage, 16, 1)
END
IF @realProjectId IS NULL
BEGIN
-- create a the error message for a project that does not exist
SELECT @ErrorMessage = N'The input ProjectId does not have a corresponding Project record. No calculations will
be performed. ProjectId: ' + CAST(@projectId AS VARCHAR)
-- raise the error
RAISERROR (@ErrorMessage, 16, 1)
END
BEGIN TRANSACTION
-- If deleting all, delete all reports associated with project first:
IF @deleteType = @deleteTypeAll
BEGIN
DELETE [dbo].[ReportComment]
WHERE ReportId in (SELECT ReportId
FROM [dbo].[Report]
WHERE ProjectId = @realProjectId)
DELETE [dbo].[ReportMetric]
WHERE ReportId in (SELECT ReportId
FROM [dbo].[Report]
WHERE ProjectId = @realProjectId)
DELETE [dbo].[ReportTopN]
WHERE ReportId in (SELECT ReportId
FROM [dbo].[Report]
WHERE ProjectId = @realProjectId)
DELETE [dbo].[Report]
WHERE ReportId in (SELECT ReportId
FROM [dbo].[Report]
WHERE ProjectId = @realProjectId)
END
ELSE
BEGIN
DELETE [dbo].[ReportTopN]
WHERE ReportId in (SELECT ReportId
FROM [dbo].[Report]
WHERE ProjectId = @realProjectId)
END
IF @deleteType IN (@deleteTypeAll, @deleteTypeNodes)
BEGIN
DECLARE @Keys TABLE (
ProjectId INT,
NodeId INT,
DeviationId INT,
CauseId INT,
ConsequenceId INT,
SafeguardId INT,
RecommendationId INT,
RemarkId INT,
DrawingId INT,
RiskDataId INT,
BowtieLoopId INT,
BowtieId INT)
-- build a list of keys associated with the project (simplifies delete queries)
INSERT INTO @Keys (ProjectId,
NodeId,
DeviationId,
CauseId,
ConsequenceId,
SafeguardId,
RecommendationId,
RemarkId,
DrawingId,
RiskDataId,
BowtieLoopId,
BowtieId)
SELECT p.ProjectId,
n.NodeId,
d.DeviationId,
ca.CauseId,
co.ConsequenceId,
s.SafeguardId,
r.RecommendationId,
re.RemarkId,
dr.DrawingId,
rd.RiskDataId,
bl.BowtieLoopId,
b.BowtieId
FROM Project p
LEFT OUTER JOIN Node n
ON p.ProjectId = n.ProjectId
LEFT OUTER JOIN Deviation d
ON n.NodeId = d.NodeId
LEFT OUTER JOIN Cause ca
ON d.DeviationId = ca.DeviationId
LEFT OUTER JOIN Consequence co
ON ca.CauseId = co.CauseId
LEFT OUTER JOIN Safeguard s
ON co.ConsequenceId = s.ConsequenceId
LEFT OUTER JOIN Recommendation r
ON co.ConsequenceId = r.ConsequenceId
LEFT OUTER JOIN Remark re
ON co.ConsequenceId = re.ConsequenceId
LEFT OUTER JOIN Drawing dr
ON r.RecommendationId = dr.RecommendationId
LEFT OUTER JOIN Bowtie b
ON b.ProjectId = p.ProjectId
LEFT OUTER JOIN BowtieLoop bl
ON bl.BowtieId = b.BowtieId
LEFT Outer JOIN RiskData rd
ON rd.BowtieLoopId = bl.BowtieLoopId
WHERE p.ProjectId = @realProjectId
-- delete the data that was imported
DELETE FROM Drawing
WHERE DrawingId IN (SELECT DISTINCT DrawingId
FROM @Keys)
DELETE FROM Recommendation
WHERE RecommendationId IN (SELECT DISTINCT RecommendationId
FROM @Keys)
DELETE FROM Safeguard
WHERE SafeguardId IN (SELECT DISTINCT SafeguardId
FROM @Keys)
DELETE FROM Remark
WHERE RemarkId IN (SELECT DISTINCT RemarkId
FROM @Keys)
DELETE FROM Consequence
WHERE ConsequenceId IN (SELECT DISTINCT ConsequenceId
FROM @Keys)
DELETE FROM CauseToBowtieLoopDetails
Where CauseId IN (Select Distinct CauseId
FROM @Keys)
DELETE FROM Cause
WHERE CauseId IN (SELECT DISTINCT CauseId
FROM @Keys)
DELETE FROM Deviation
WHERE DeviationId IN (SELECT DISTINCT DeviationId
FROM @Keys)
DELETE FROM Node
WHERE NodeId IN (SELECT DISTINCT NodeId
FROM @Keys)
DELETE FROM RiskData
WHERE RiskDataId IN (SELECT DISTINCT RiskDataId
FROM @Keys)
DELETE FROM BowtieLoop
WHERE BowtieLoopId IN (SELECT DISTINCT BowtieLoopId
FROM @Keys)
DELETE FROM BowtieToEquipmentLookup
WHERE BowtieId IN (SELECT DISTINCT BowtieId
FROM @Keys)
DELETE FROM Bowtie
WHERE BowtieId IN (SELECT DISTINCT BowtieId
FROM @Keys)
DELETE FROM ProjectDeviation
WHERE ProjectId = @realProjectId
DELETE FROM ProjectSafeguard
WHERE ProjectId = @realProjectId
DELETE FROM ProjectRecommendation
WHERE ProjectId = @realProjectId
-- also delete from the metrics tables
DELETE FROM ProjectMetrics
WHERE ProjectId = @realProjectId
DELETE FROM CauseMetrics
WHERE ProjectId = @realProjectId
DELETE FROM ConsequenceMetrics
WHERE ProjectId = @realProjectId
DELETE FROM RecommendationMetrics
WHERE ProjectId = @realProjectId
DELETE FROM SafeguardMetrics
WHERE ProjectId = @realProjectId
END
IF @deleteType = @deleteTypeAll
BEGIN
-- delete the project specific data (i.e., data not imported)
DELETE FROM RiskMatrixAxis
WHERE ProjectId = @realProjectId
DELETE FROM SafeRecCategory
WHERE ProjectId = @realProjectId
DELETE FROM Participant
WHERE ProjectId = @realProjectId
DELETE FROM RiskRanking
WHERE ProjectId = @realProjectId
DELETE FROM Category
WHERE ProjectId = @realProjectId
DELETE FROM ImportFile
WHERE ProjectId = @realProjectId
DELETE FROM Project
WHERE ProjectId = @realProjectId
END
COMMIT TRANSACTION
END TRY
BEGIN CATCH
IF(@@TRANCOUNT > 0)
BEGIN
-- rollback all changes if any error occurred
ROLLBACK TRANSACTION
END
-- raise the original error
EXEC RethrowError;
END CATCH
如您所见，存储过程不会返回任何内容。我告诉过，如果它没有返回任何内容，那么运行存储过程的Entity Framework调用将返回行数。那么它返回-1意味着什么呢？我是否正确将-1解释为错误？
答案 0 :(得分：2)
来自Microsoft doc on ExecuteNonQuery（here）：
对于UPDATE，INSERT和DELETE语句，返回值为 受命令影响的行数。当a上存在触发器时 正在插入或更新的表，返回值包括数字 受插入或更新操作影响的行数和数字 受触发器或触发器影响的行数。对于所有其他类型的 语句，返回值为-1。如果发生回滚，则返回 值也是-1。
由于您正在调用proc，但尝试将其视为函数，我认为检索它的返回值会导致相同的行为。