Question

我尝试做的是更新一个条目，如果它不存在 - 创建一个条目。

This正是我想要遵循的。

我收到了语法错误异常，我不知道错误是什么。

这就是我如何制作我的桌子：

CREATE TABLE [dbo].[Rides] (
    [phone]       VARCHAR (32)  NOT NULL,
    [destination] VARCHAR (50)  NOT NULL,
    [departure]   VARCHAR (50)  NOT NULL,
    [time]        DATETIME      NOT NULL,
    [comment]     NVARCHAR (50) NOT NULL,
    PRIMARY KEY CLUSTERED ([phone] ASC)
);

这是我的疑问：

SqlCommand command = connection.CreateCommand();
command.CommandText =
@"UPDATE Rides SET (destination=@Dest, departure=@Depart, time=@Time, comment=@Comment) WHERE phone=@UName
IF (@@ROWCOUNT=0)
    INSERT INTO Rides VALUES (destination=@Dest, departure=@Depart, time=@Time, comment=@Comment)";

command.Parameters.AddWithValue("@UName", entry.phone);
command.Parameters.AddWithValue("@Dest", entry.destinationID);
command.Parameters.AddWithValue("@Depart", entry.departureID);
command.Parameters.AddWithValue("@Time", entry.time.ToString("yyyy-MM-dd HH:mm:ss:fff"));
command.Parameters.AddWithValue("@Comment", entry.comment);
command.ExecuteNonQuery();

那是entry：

public struct Entry
{
    public string phone;
    public string destinationID;
    public string departureID;
    public DateTime time;
    public string comment;
}

这是我的错误：

类型＆＃39; System.Data.SqlClient.SqlException＆＃39;的异常发生在System.Data.dll中但未在用户代码中处理

其他信息：＆＃39;（＆＃39;。
附近的语法不正确
＆＃39; =＆＃39;。
附近的语法不正确

堆栈追踪：

[SqlException (0x80131904): Incorrect syntax near '('.
Incorrect syntax near '='.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +2442126
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5736904
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +628
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +3731
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +225
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds, Boolean describeParameterEncryptionRequest) +2026
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +375
   System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite) +337
   System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +280
   RidesDatabaseAccessor.updateEntry(Entry entry) in c:\Users\Climax708\Documents\Programming\TrempLehayal\App_Code\RidesDatabaseAccessor.cs:145
   newride.Page_Load(Object sender, EventArgs e) in c:\Users\Climax708\Documents\Programming\TrempLehayal\newride.aspx.cs:75
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2952

Answer 1

我做了以下更改：

我在你的两个语句（UPDATE和}之间添加了一个分号 INSERT）。
我从UPDATE声明中删除了括号（它们不是需要）

我更正了INSERT语句的语法。列名称必须在他们自己的括号中单独给出在VALUES之前。

command.CommandText = @"UPDATE Rides 
     SET destination=@Dest, departure=@Depart, time=@Time, comment=@Comment 
     WHERE phone=@UName; 
     IF (@@ROWCOUNT=0)
         INSERT INTO Rides (destination, departure, time, comment) 
         VALUES (@Dest, @Depart, @Time, @Comment)";

Answer 2

在您的更新中，您不得使用set

列周围的（）

UPDATE Rides 
SET destination = @Dest, 
    departure = @Depart, 
    time = @Time, 
    comment = @Comment 
WHERE phone = @UName

Answer 3

我想你应该试试

@＆＃34; UPDATE Rides SET destination = @ Dest，departure = @Dispart，time = @ Time，comment = @ Comment WHERE phone = @ UName

发布您的更新查询

＆＃39;附近的语法不正确（＆＃39;以及＆＃39; =＆＃39;

3 个答案: