C# Dapper SQL Server 连接错误：连接字符串中不存在 Dapper 连接到另一个数据库

Posted 2023-04-12

【中文标题】C# Dapper SQL Server 连接错误：连接字符串中不存在 Dapper 连接到另一个数据库

【英文标题】：C# Dapper SQL Server Connection Error : Dapper Connect to anther database not exist in connection string

【发布时间】：2020-11-25 12:39:16

【问题描述】：

我正在使用 Dapper 连接到 SQL server 数据库

我的数据库是 SeasonDB，我创建了另一个名为 SeasonDb2 的数据库来测试修改

在我从 SQL 服务器中删除 SeasonDb2 并将连接字符串更改为 SeasonDB 之前，它一直运行良好

从配置文件中获取连接字符串

  <connectionStrings>

<add name="SQLServer_Connection" connectionString="data source=.;integrated security=SSPI;initial catalog=SeasonDB"/>

当我启动应用程序时显示此错误消息

System.Data.DataException
  HResult=0x80131501
  Message=Error parsing column 1 (DegreeID=1 - Int32)
  Source=Dapper
  StackTrace:
   at Dapper.SqlMapper.ThrowDataException(Exception ex, Int32 index, IDataReader reader, Object value) in /_/Dapper/SqlMapper.cs:line 3665
   at Dapper.SqlMapper.<QueryImpl>d__140`1.MoveNext() in /_/Dapper/SqlMapper.cs:line 1102
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Dapper.SqlMapper.Query[T](IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Boolean buffered, Nullable`1 commandTimeout, Nullable`1 commandType) in /_/Dapper/SqlMapper.cs:line 725
   at Season_Models.DataAccess.SQLServerConnector.UsersSearch2(String searchValue) in C:\Users\MohamedSaqr\Source\Repos\PrintAndPublishBranch\SeasonApp\Season Models\DataAccess\SQLServerConnector.cs:line 221
   at Season_Models.GlobalData.GlobalData.get_Users() in C:\Users\MohamedSaqr\Source\Repos\PrintAndPublishBranch\SeasonApp\Season Models\GlobalData\GlobalData.cs:line 149
   at Season_Application.UI.Login.UserLogin() in C:\Users\MohamedSaqr\Source\Repos\PrintAndPublishBranch\SeasonApp\Season Application\UI\Login.cs:line 100
   at Season_Application.UI.Login.SaveOnEnterKeyPressed(Object sender, KeyPressEventArgs e) in C:\Users\MohamedSaqr\Source\Repos\PrintAndPublishBranch\SeasonApp\Season Application\UI\Login.cs:line 170
   at System.Windows.Forms.Control.OnKeyPress(KeyPressEventArgs e)
   at System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
   at System.Windows.Forms.Control.WmKeyChar(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.TextBox.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at Season_Application.Program.Main() in C:\Users\MohamedSaqr\Source\Repos\PrintAndPublishBranch\SeasonApp\Season Application\Program.cs:line 36
Inner Exception 1:
SqlException: Invalid object name 'SeasonDB2.dbo.TableLastModificationTime'.

运行代码

 public List<UserModel> UsersSearch2(string searchValue)
    
        List<UserModel> users;
        using (IDbConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["SQLServer_Connection"].ToString()))
        
            var p = new DynamicParameters();
            p.Add("@SearchValue", searchValue);

            users =
                connection.Query<UserModel>("SPGetUsers2", p, commandType: CommandType.StoredProcedure).ToList();
            foreach (var user in users)
                user.UserDegree = GlobalData.GlobalData.Degrees
                    .Where(degree => degree.DegreeID == user.DegreeID).ToList()[0];
        

        return users;
    

错误显示在这里

                users =
                connection.Query<UserModel>("SPGetUsers2", p, commandType: CommandType.StoredProcedure).ToList();

dapper 连接 SeasonDb2 的问题

SqlException：无效的对象名称“SeasonDB2.dbo.TableLastModificationTime”。

我的存储过程使用 SeasonDB

USE [SeasonDB]
GO
/****** Object:  StoredProcedure [dbo].[SPTableLastModificationTime]    
Script Date: 25/11/2020 02:43:32 م ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- Batch submitted through debugger: 
SQLQuery1.sql|7|0|C:\Users\Navy5\AppData\Local\Temp\~vs5FCC.sql

ALTER PROCEDURE [dbo].[SPTableLastModificationTime]
-- Add the parameters for the stored procedure here
@TableName sysname,
@TableLastModificationTime DateTime output
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

-- Insert statements for procedure here
Select  @TableLastModificationTime =  [TableLastModiticationTime]
    FROM [SeasonDB2].[dbo].[TableLastModificationTime]
    Where TableName = @TableName

    if @TableLastModificationTime is null
    Begin
         select @TableLastModificationTime = 
        ius.last_user_update
        FROM
        sys.dm_db_index_usage_stats ius INNER JOIN
        sys.tables tbl ON (tbl.OBJECT_ID = ius.OBJECT_ID)
        WHERE ius.database_id = DB_ID() and tbl.name  = @TableName


        if @TableLastModificationTime is null
        Begin
            select @TableLastModificationTime = GETDATE()
        END


        INSERT INTO [dbo].[TableLastModificationTime]
        ([TableName],TableLastModiticationTime)
        VALUES
        (@TableName,@TableLastModificationTime)


    END
    Else
    Begin
        Declare @TempTime DATETIME


        SELECT @TempTime =  ius.last_user_update
        FROM
        sys.dm_db_index_usage_stats ius INNER JOIN
        sys.tables tbl ON (tbl.OBJECT_ID = ius.OBJECT_ID)
        WHERE ius.database_id = DB_ID() and tbl.name  = @TableName

        IF @TempTime is not null AND @TempTime <> @TableLastModificationTime
        BEGIN
            SET @TableLastModificationTime = @TempTime

            UPDATE [dbo].[TableLastModificationTime]
            SET 
              [TableLastModiticationTime] = @TableLastModificationTime,
              EditLastTime = GetDate()
            WHERE [TableName] = @TableName
        END

        


    END
        
END

提前致谢

【问题讨论】：

看来存储过程代码还是引用了SeasonDB2。检查存储过程中的代码

存储过程使用SeasonDB

【参考方案1】：

您的问题出在存储过程中。更准确地说，在这里：

Select  @TableLastModificationTime =  [TableLastModiticationTime]
    FROM [SeasonDB2].[dbo].[TableLastModificationTime] ...

SeasonDB2 在查询中被硬编码。

您需要更改您的 SP 并将其删除，因为只要存储过程位于正确的 DB 上，就不需要此前缀