2

我已經爲使用T4模板的MVC3編寫了一個自定義腳手架來爲作爲參數傳遞給腳手架的數據庫和表進行腳手架刪除存儲過程。當我運行的輸出文件在正確的位置創建的棚架,但我得到了以下錯誤:MVC3/T4自定義腳手架即使文件不存在也會導致文件存在錯誤

Invoke-ScaffoldTemplate : Unable to add 'UpdateCustomerCoupon.sql'. A file with that name already exists. At line:1 char:23 + param($c, $a) return . <<<< $c @a + CategoryInfo : NotSpecified: (:) [Invoke-ScaffoldTemplate], COMException + FullyQualifiedErrorId : T4Scaffolding.Cmdlets.InvokeScaffoldTemplateCmdlet

如果文件存在於輸出位置,或者不沒關係。我每次都會遇到這個錯誤。

下面是棚架PowerShell腳本:

[T4Scaffolding.Scaffolder(Description = "Enter a description of DeleteSQL here")][CmdletBinding()] 
param(
    [parameter(Mandatory = $true, ValueFromPipelineByPropertyName = $true)][string]$DatabaseName, 
    [parameter(Mandatory = $true, ValueFromPipelineByPropertyName = $true)][string]$TableName, 
    [string]$Project, 
    [string]$CodeLanguage, 
    [string[]]$TemplateFolders, 
    [switch]$Force = $true 
) 

$outputPath = "Scripts/SQL/$TableName/Delete$TableName" 

Add-ProjectItemViaTemplate $outputPath -Template DeleteSQLTemplate ` 
    -Model @{ TableName = $TableName; DatabaseName = $DatabaseName; Project = $Project } ` 
    -SuccessMessage "Added DeleteSQL output at {0}" ` 
    -TemplateFolders $TemplateFolders -Project $Project -CodeLanguage $CodeLanguage -Force:$Force 

Write-Host "Scaffolded DeleteSQL" 

這裏是T4模板代碼:

<#@ Template Language="C#" HostSpecific="True" Inherits="DynamicTransform" Debug="True" #> 
<#@ Output Extension="sql" #> 
<#@ assembly name="System.Collections" #> 
<#@ assembly name="System.Configuration" #> 
<#@ assembly name="System.Data" #> 
<#@ assembly name="System.Web" #> 
<#@ import namespace="System.Collections.Generic" #> 
<#@ import namespace="System.Configuration" #> 
<#@ import namespace="System.Data" #> 
<#@ import namespace="System.Data.SqlClient" #> 
<#@ import namespace="System.Web" #> 
USE [<#= Model.DatabaseName #>] 
GO 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
ALTER PROCEDURE [dbo].[Delete<#= Model.TableName #>] (
    @P<#= Model.TableName #>ID AS BIGINT, 
    @PChangedByUserID BIGINT, 
    @PChangedByURL VARCHAR(1024), 
    @PChangedByIpAddress varchar(16) 
) 
AS 
    SET NOCOUNT ON 

    BEGIN TRY 
     BEGIN TRANSACTION 
      -- update user history 
      DECLARE @userHistoryID BIGINT = 0; 
      DECLARE @details VARCHAR(4096) = '[<#= Model.TableName #>] ID ''' + CAST(@P<#= Model.TableName #>ID AS VARCHAR) + ''' was deleted.' 
      EXEC InsertUserHistory @PChangedByUserID, @details, @PChangedByURL, @PChangedByIpAddress, @userHistoryID OUTPUT 

      -- Rollback transaction if user history was not created 
      IF(@userHistoryID = 0) BEGIN 
       ROLLBACK 
       SELECT CAST(-1 AS INT) 
       RETURN 
      END 

      DELETE FROM 
       [<#= Model.TableName #>] 
      WHERE 
       [ID] = @P<#= Model.TableName #>ID 
     COMMIT 

     SELECT CAST(1 AS INT) 
    END TRY 
    BEGIN CATCH 
     ROLLBACK 
     SELECT CAST(-2 AS INT) 
    END CATCH 

    RETURN 

我通過鍵入「腳手架DeleteSQL -databasename $數據庫名調用棚架 - TableName $ TableName「放入程序包管理器控制檯。

我自己也嘗試通過這樣的-Force選項調用棚架:「腳手架DeleteSQL -databasename $數據庫名-TableName $表名-Force」。我也用「-真力」和「-力:真」沒有運氣。還要注意$ Force參數設置爲true,所以我認爲它應該默認覆蓋,對吧?

我需要做些什麼來擺脫這個錯誤?

感謝您的幫助。

回答

4

看起來問題與輸出產生的路徑有關。

我改變了這一行的PowerShell腳本:

$outputPath = "Scripts/SQL/$TableName/Delete$TableName" 

這樣:

$outputPath = "Scripts\SQL\$TableName\Delete$TableName" 

我唯一改變的是從斜槓 「/」 到 「\」。現在,我不再收到錯誤消息。

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