如何查看实体框架生成的SQL ?
(在我的特殊情况下,我使用mysql提供商-如果它重要)
如何查看实体框架生成的SQL ?
(在我的特殊情况下,我使用mysql提供商-如果它重要)
当前回答
我刚刚做了这个:
IQueryable<Product> query = EntitySet.Where(p => p.Id == id);
Debug.WriteLine(query);
结果显示在Output:
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Code] AS [Code],
[Extent1].[Name] AS [Name],
[Extent2].[Id] AS [Id1],
[Extent2].[FileName] AS [FileName],
FROM [dbo].[Products] AS [Extent1]
INNER JOIN [dbo].[PersistedFiles] AS [Extent2] ON [Extent1].[PersistedFileId] = [Extent2].[Id]
WHERE [Extent1].[Id] = @p__linq__0
其他回答
我正在做集成测试,需要在实体框架核心2.1中调试生成的SQL语句,所以我使用DebugLoggerProvider或ConsoleLoggerProvider,如下所示:
[Fact]
public async Task MyAwesomeTest
{
//setup log to debug sql queries
var loggerFactory = new LoggerFactory();
loggerFactory.AddProvider(new DebugLoggerProvider());
loggerFactory.AddProvider(new ConsoleLoggerProvider(new ConsoleLoggerSettings()));
var builder = new DbContextOptionsBuilder<DbContext>();
builder
.UseSqlServer("my connection string") //"Server=.;Initial Catalog=TestDb;Integrated Security=True"
.UseLoggerFactory(loggerFactory);
var dbContext = new DbContext(builder.Options);
........
下面是Visual Studio控制台的输出示例:
在我的EF 6+的情况下,而不是在立即窗口中使用这个来查找查询字符串:
var sql = ((System.Data.Entity.Core.Objects.ObjectQuery)query).ToTraceString();
我最终不得不使用这个来获得生成的SQL命令:
var sql = ((System.Data.Entity.Infrastructure.DbQuery<<>f__AnonymousType3<string,string,string,short,string>>)query).ToString();
当然,您的匿名类型签名可能有所不同。
HTH.
如果您正在使用DbContext,您可以执行以下操作来获取SQL:
var result = from i in myContext.appEntities
select new Model
{
field = i.stuff,
};
var sql = result.ToString();
对于那些使用Entity Framework 6及以上版本的用户,如果你想在Visual Studio中查看输出SQL(就像我做的那样),你必须使用新的日志/拦截功能。
添加下面这行代码将在Visual Studio输出面板中输出生成的SQL(以及其他与执行相关的详细信息):
using (MyDatabaseEntities context = new MyDatabaseEntities())
{
context.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);
// query the database using EF here.
}
有关登录EF6的更多信息,请参阅这个漂亮的博客系列:http://blog.oneunicorn.com/2013/05/08/ef6-sql-logging-part-1-simple-logging/
注意:确保在DEBUG模式下运行项目。
EF Core 5.0+
这个期待已久的功能在EF Core 5.0中可用!这是每周的状态更新:
var query = context.Set<Customer>().Where(c => c.City == city); Console.WriteLine(query.ToQueryString()) results in this output when using the SQL Server database provider: DECLARE p0 nvarchar(4000) = N'London'; SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region] FROM [Customers] AS [c] WHERE [c].[City] = @__city_0 Notice that declarations for parameters of the correct type are also included in the output. This allows copy/pasting to SQL Server Management Studio, or similar tools, such that the query can be executed for debugging/analysis.
哦吼! !
(注意:你需要使用Microsoft.EntityFrameworkCore;)