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我已经为 MVC3 编写了一个自定义脚手架,使用 T4 模板为作为参数传递给脚手架的数据库和表的删除存储过程搭建脚手架。当我运行脚手架时,会在正确的位置创建输出文件,但出现以下错误:

Invoke-ScaffoldTemplate:无法添加“UpdateCustomerCoupon.sql”。已存在具有该名称的文件。在 line:1 char:23 + param($c, $a) return 。<<<< $c @a + CategoryInfo : NotSpecified: (:) [Invoke-ScaffoldTemplate], COMException + FullyQualifiedErrorId : T4Scaffolding.Cmdlets.InvokeScaffoldTemplateCmdlet

文件是否存在于输出位置并不重要。我每次都会收到这个错误。

这是脚手架的 PowerShell 脚本:

[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"

这是 T4 模板代码:

<#@ 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

我通过在包管理器控制台中键入“ Scaffold DeleteSQL -DatabaseName $DatabaseName -TableName $TableName ”来调用脚手架。

我还尝试使用 -Force 选项调用脚手架,如下所示:“ Scaffold DeleteSQL -DatabaseName $DatabaseName -TableName $TableName -Force ”。我也使用了“ -Force true ”和“ -Force:true ”,但没有成功。还要注意 $Force 参数无论如何都设置为 true,所以我认为它应该默认覆盖,对吧?

我需要做什么才能摆脱这个错误?

谢谢您的帮助。

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1 回答 1

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看起来问题与生成输出的路径有关。

我在 PowerShell 脚本中更改了这一行:

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

对此:

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

我唯一改变的是从“/”到“\”的斜线。现在,我不再收到错误消息了。

于 2012-05-21T21:38:09.057 回答