How do I view the SQL generated by the Entity Framework

Question

How do I view the SQL generated by entity framework     In my particular case I m using the mysql provider - if it matters

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For me  using EF6 and Visual Studio 2015 I entered query in the immediate window and it gave me the generated SQL Statement

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Starting with EF6 1 you can use Interceptors to register a database logger  See chapters  Interceptors  and  Logging Database Operations  to a File here   lt interceptors gt      lt interceptor type  System Data Entity Infrastructure Interception DatabaseLogger  EntityFramework  gt        lt parameters gt          lt parameter value  C  Temp LogOutput txt   gt          lt parameter value  true  type  System Boolean   gt        lt  parameters gt      lt  interceptor gt    lt  interceptors gt

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In my case for EF 6   instead of using this in the Immediate Window to find the query string   var sql     System Data Entity Core Objects ObjectQuery query  ToTraceString      I ended up having to use this to get the generated SQL command   var sql     System Data Entity Infrastructure DbQuery lt  lt  gt f  AnonymousType3 lt string string string short string gt  gt  query  ToString      Of course your anonymous type signature might be different   HTH

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Necromancing   This page is the first search result when searching for a solution for any  NET Framework  so here as a public service  how it s done in EntityFrameworkCore  for  NET Core 1  amp  2    var someQuery         from projects in  context projects     join issues in  context issues on projects Id equals issues ProjectId into tmpMapp     from issues in tmpMapp DefaultIfEmpty       select issues      ToList         string sql   someQuery ToString       string sql   Microsoft EntityFrameworkCore IQueryableExtensions ToSql someQuery      string sql   Microsoft EntityFrameworkCore IQueryableExtensions1 ToSql someQuery      using Microsoft EntityFrameworkCore  string sql   someQuery ToSql    System Console WriteLine sql     And then these extension methods  IQueryableExtensions1 for  NET Core 1 0  IQueryableExtensions for  NET Core 2 0     using System  using System Linq  using System Reflection  using Microsoft EntityFrameworkCore Internal  using Microsoft EntityFrameworkCore Query  using Microsoft EntityFrameworkCore Query Internal  using Microsoft EntityFrameworkCore Storage  using Remotion Linq Parsing Structure    namespace Microsoft EntityFrameworkCore           https   stackoverflow com questions 1412863 how-do-i-view-the-sql-generated-by-the-entity-framework        http   rion io 2016 10 19 accessing-entity-framework-core-queries-behind-the-scenes-in-asp-net-core       public static class IQueryableExtensions               private static readonly TypeInfo QueryCompilerTypeInfo   typeof QueryCompiler  GetTypeInfo             private static readonly FieldInfo QueryCompilerField   typeof EntityQueryProvider  GetTypeInfo   DeclaredFields              First x   gt  x Name      queryCompiler             private static readonly PropertyInfo NodeTypeProviderField               QueryCompilerTypeInfo DeclaredProperties Single x   gt  x Name     NodeTypeProvider             private static readonly MethodInfo CreateQueryParserMethod               QueryCompilerTypeInfo DeclaredMethods First x   gt  x Name     CreateQueryParser             private static readonly FieldInfo DataBaseField               QueryCompilerTypeInfo DeclaredFields Single x   gt  x Name      database             private static readonly PropertyInfo DatabaseDependenciesField               typeof Database  GetTypeInfo   DeclaredProperties Single x   gt  x Name     Dependencies             public static string ToSql lt TEntity gt  this IQueryable lt TEntity gt  query  where TEntity   class                       if    query is EntityQueryable lt TEntity gt    amp  amp    query is InternalDbSet lt TEntity gt                                  throw new ArgumentException  Invalid query                               var queryCompiler    QueryCompiler  QueryCompilerField GetValue query Provider               var nodeTypeProvider    INodeTypeProvider  NodeTypeProviderField GetValue queryCompiler               var parser    IQueryParser  CreateQueryParserMethod Invoke queryCompiler  new object    nodeTypeProvider                var queryModel   parser GetParsedQuery query Expression               var database   DataBaseField GetValue queryCompiler               var databaseDependencies    DatabaseDependencies  DatabaseDependenciesField GetValue database               var queryCompilationContext   databaseDependencies QueryCompilationContextFactory Create false               var modelVisitor    RelationalQueryModelVisitor  queryCompilationContext CreateQueryModelVisitor                modelVisitor CreateQueryExecutor lt TEntity gt  queryModel               var sql   modelVisitor Queries First   ToString                 return sql                         public class IQueryableExtensions1               private static readonly TypeInfo QueryCompilerTypeInfo   typeof QueryCompiler  GetTypeInfo             private static readonly FieldInfo QueryCompilerField   typeof EntityQueryProvider  GetTypeInfo                DeclaredFields              First x   gt  x Name      queryCompiler             private static readonly PropertyInfo NodeTypeProviderField               QueryCompilerTypeInfo DeclaredProperties Single x   gt  x Name     NodeTypeProvider             private static readonly MethodInfo CreateQueryParserMethod               QueryCompilerTypeInfo DeclaredMethods First x   gt  x Name     CreateQueryParser             private static readonly FieldInfo DataBaseField               QueryCompilerTypeInfo DeclaredFields Single x   gt  x Name      database             private static readonly FieldInfo QueryCompilationContextFactoryField   typeof Database  GetTypeInfo                DeclaredFields Single x   gt  x Name      queryCompilationContextFactory              public static string ToSql lt TEntity gt  IQueryable lt TEntity gt  query  where TEntity   class                       if    query is EntityQueryable lt TEntity gt    amp  amp    query is InternalDbSet lt TEntity gt                                  throw new ArgumentException  Invalid query                               var queryCompiler    IQueryCompiler  QueryCompilerField GetValue query Provider                var nodeTypeProvider    INodeTypeProvider  NodeTypeProviderField GetValue queryCompiler               var parser                    IQueryParser  CreateQueryParserMethod Invoke queryCompiler  new object    nodeTypeProvider                var queryModel   parser GetParsedQuery query Expression               var database   DataBaseField GetValue queryCompiler               var queryCompilationContextFactory                    IQueryCompilationContextFactory  QueryCompilationContextFactoryField GetValue database               var queryCompilationContext   queryCompilationContextFactory Create false               var modelVisitor    RelationalQueryModelVisitor  queryCompilationContext CreateQueryModelVisitor                modelVisitor CreateQueryExecutor lt TEntity gt  queryModel               var sql   modelVisitor Queries First   ToString                 return sql

User · Answer

You can do the following   IQueryable query   from x in appEntities              where x id    32              select x   var sql     System Data Objects ObjectQuery query  ToTraceString      or in EF6   var sql     System Data Entity Core Objects ObjectQuery query               ToTraceString      That will give you the SQL that was generated

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SQL Management Studio    Tools    SQL Server profiler  File    New Trace     Use the Template    Blank  Event selection    T-SQL  Lefthandside check for  SP StmtComplete  Column filters can be used to select a specific ApplicationName or DatabaseName  Start that profile running then trigger the query   Click here for Source information

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If you want to have parameter values  not only  p linq 0 but also their values  too  you can use IDbCommandInterceptor and add some logging to ReaderExecuted method

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You can do the following in EF 4 1   var result   from x in appEntities              where x id   32              select x   System Diagnostics Trace WriteLine result  ToString       That will give you the SQL that was generated

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Well  I am using Express profiler for that purpose at the moment  the drawback is that it only works for MS SQL Server  You can find this tool here  https   expressprofiler codeplex com

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My answer addresses EF core  I reference this github issue  and the docs on configuring DbContext    Simple  Override the OnConfiguring method of your DbContext class  YourCustomDbContext  as shown here to use a ConsoleLoggerProvider  your queries should log to the console   public class YourCustomDbContext   DbContext        region DefineLoggerFactory     public static readonly LoggerFactory MyLoggerFactory           new LoggerFactory new    new ConsoleLoggerProvider           gt  true  true          endregion        region RegisterLoggerFactory     protected override void OnConfiguring DbContextOptionsBuilder optionsBuilder            gt  optionsBuilder              UseLoggerFactory MyLoggerFactory      Warning  Do not create a new ILoggerFactory instance each time                      endregion     Complex  This Complex case avoids overriding the DbContext OnConfiguring method    which is discouraged in the docs   This approach does not lend itself to testing  unless the tests target the full database    This Complex case uses    The IServiceCollection in Startup class ConfigureServices method   instead of overriding the OnConfiguring method  the benefit is a looser coupling between the DbContext and the ILoggerProvider you want to use  An implementation of ILoggerProvider  instead of using the ConsoleLoggerProvider implementation shown above  benefit is our implementation shows how we would log to File  I don t see a File Logging Provider shipped with EF Core     Like this    public class Startup      public void ConfigureServices IServiceCollection services                            var lf   new LoggerFactory            lf AddProvider new MyLoggerProvider              services AddDbContext lt YOUR DB CONTEXT gt  optionsBuilder   gt  optionsBuilder                  UseSqlServer connection string                    Using the LoggerFactory                   UseLoggerFactory lf                          Here s the implementation of a MyLoggerProvider  and its MyLogger which appends its logs to a File you can configure  your EF Core queries will appear in the file    public class MyLoggerProvider   ILoggerProvider       public ILogger CreateLogger string categoryName                return new MyLogger               public void Dispose                private class MyLogger   ILogger               public bool IsEnabled LogLevel logLevel                        return true                     public void Log lt TState gt  LogLevel logLevel  EventId eventId  TState state  Exception exception  Func lt TState  Exception  string gt  formatter                        File AppendAllText   C  temp log txt   formatter state  exception                Console WriteLine formatter state  exception                       public IDisposable BeginScope lt TState gt  TState state                        return null

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IQueryable query   from x in appEntities                    where x id   32                    select x  var queryString   query ToString      Will return the sql query  Working using datacontext of EntityFramework 6

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I am doing integration test  and needed this to debug the generated SQL statement in Entity Framework Core 2 1  so I use DebugLoggerProvider or ConsoleLoggerProvider like so    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 lt DbContext gt             builder              UseSqlServer  my connection string      Server   Initial Catalog TestDb Integrated Security True               UseLoggerFactory loggerFactory            var dbContext   new DbContext builder Options                       Here is a sample output from Visual Studio console

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There are two ways    To view the SQL that will be generated  simply call ToTraceString     You can add it into your watch window and set a breakpoint to see what the query would be at any given point for any LINQ query  You can attach a tracer to your SQL server of choice  which will show you the final query in all its gory detail   In the case of MySQL  the easiest way to trace the queries is simply to tail the query log with tail -f   You can learn more about MySQL s logging facilities in the official documentation   For SQL Server  the easiest way is to use the included SQL Server profiler

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While there are good answers here  none solved my problem completely  I wished to get the entire SQL statement  including Parameters  from the DbContext from any IQueryable   The following code does just that  It is a combination of code snippets from Google   I have only tested it with EF6    Just an aside  this task took me way longer than I thought it would   Abstraction in Entity Framework is a bit much  IMHO    First the using   You will need an explicit reference to  System Data Entity dll    using System  using System Collections Generic  using System Linq  using System Text  using System Threading Tasks  using System Data SqlClient  using System Data Common  using System Data Entity Core Objects  using System Data Entity  using System Data  using System Data Entity Infrastructure  using System Reflection    The following class converts an IQueryable into a DataTable   Modify as your need may be   public class EntityFrameworkCommand       DbContext Context       string SQL       ObjectParameter   Parameters       public EntityFrameworkCommand Initialize lt T gt  DbContext context  IQueryable lt T gt  query                Context   context          var dbQuery   query as DbQuery lt T gt              get the IInternalQuery internal variable from the DbQuery object         var iqProp   dbQuery GetType   GetProperty  InternalQuery   BindingFlags Instance   BindingFlags NonPublic   BindingFlags Public           var iq   iqProp GetValue dbQuery  null              get the ObjectQuery internal variable from the IInternalQuery object         var oqProp   iq GetType   GetProperty  ObjectQuery   BindingFlags Instance   BindingFlags NonPublic   BindingFlags Public           var objectQuery   oqProp GetValue iq  null  as ObjectQuery lt T gt           SQL   objectQuery ToTraceString            Parameters   objectQuery Parameters ToArray            return this             public DataTable GetData                 DataTable dt   new DataTable            var connection   Context Database Connection          var state   connection State          if    state    ConnectionState Open               connection Open            using  var cmd   connection CreateCommand                          cmd CommandText   SQL              cmd Parameters AddRange Parameters Select p   gt  new SqlParameter       p Name  p Value   ToArray                 using  var da   DbProviderFactories GetFactory connection  CreateDataAdapter                                  da SelectCommand   cmd                  da Fill dt                                   if    state    ConnectionState Open               connection Close            return dt            To use  simply call it as below   var context   new MyContext    var data         Query  return type can be anonymous      AsQueryable    var dt   new EntityFrameworkCommand        Initialize context  data       GetData

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Entity Framework 4 Solution  Most of the answers here were EF6-specific  Here s one for those of you still using EF4   This method replaces the  p  linq  0 etc  parameters with their actual values  so you can just copy and paste the output into SSMS and run it or debug it            lt summary gt          Temporary debug function that spits out the actual SQL query LINQ is generating  with parameters           lt  summary gt           lt param name  q  gt IQueryable object lt  param gt      private string Debug GetSQLFromIQueryable lt T gt  IQueryable lt T gt  q                System Data Objects ObjectQuery oq    System Data Objects ObjectQuery q          var result   oq ToTraceString            List lt string gt  paramNames   new List lt string gt             List lt string gt  paramVals   new List lt string gt             foreach  var parameter in oq Parameters                        paramNames Add parameter Name               paramVals Add parameter Value    null    NULL           parameter Value ToString                                replace params in reverse order  otherwise  p  linq  1 incorrectly replaces  p  linq  10 for instance         for  var i   paramNames Count - 1  i  gt   0  i--                        result   result Replace       paramNames i   paramVals i                      return result

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EF Core 5 0 This loooong-awaited feature is available in EF Core 5 0  This is from the weekly status updates   var query   context Set lt Customer gt    Where c   gt  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   woohoo

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I ve just done this   IQueryable lt Product gt  query   EntitySet Where p   gt  p Id    id   Debug WriteLine query     And the result shown in the 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

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Use Logging with Entity Framework Core 3 x Entity Framework Core emits SQL via the logging system  There are only a couple of small tricks  You must specify an ILoggerFactory and you must specify a filter  Here is an example from this article Create the factory  var loggerFactory   LoggerFactory Create builder   gt        builder      AddConsole  options    gt            AddFilter  category  level    gt          category    DbLoggerCategory Database Command Name          amp  amp  level    LogLevel Information        Tell the DbContext to use the factory in the OnConfiguring method  optionsBuilder UseLoggerFactory  loggerFactory    From here  you can get a lot more sophisticated and hook into the Log method to extract details about the executed SQL  See the article for a full discussion  public class EntityFrameworkSqlLogger   ILogger        region Fields     Action lt EntityFrameworkSqlLogMessage gt   logMessage       endregion      region Constructor     public EntityFrameworkSqlLogger Action lt EntityFrameworkSqlLogMessage gt  logMessage                 logMessage   logMessage             endregion      region Implementation     public IDisposable BeginScope lt TState gt  TState state                return default            public bool IsEnabled LogLevel logLevel                return true            public void Log lt TState gt  LogLevel logLevel  EventId eventId  TState state  Exception exception  Func lt TState  Exception  string gt  formatter                if  eventId Id    20101                          Filter messages that aren t relevant                There may be other types of messages that are relevant for other database platforms                return                    if  state is IReadOnlyList lt KeyValuePair lt string  object gt  gt  keyValuePairList                        var entityFrameworkSqlLogMessage   new EntityFrameworkSqlLogMessage                               eventId                   string keyValuePairList FirstOrDefault k   gt  k Key     quot commandText quot   Value                   string keyValuePairList FirstOrDefault k   gt  k Key     quot parameters quot   Value                   CommandType keyValuePairList FirstOrDefault k   gt  k Key     quot commandType quot   Value                   int keyValuePairList FirstOrDefault k   gt  k Key     quot commandTimeout quot   Value                   string keyValuePairList FirstOrDefault k   gt  k Key     quot elapsed quot   Value                             logMessage entityFrameworkSqlLogMessage                        endregion

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Applicable for EF 6 0 and above  For those of you wanting to know more about the logging functionality and adding to the some of the answers already given   Any command sent from the EF to the database can now be logged  To view the generated queries from EF 6 x  use the DBContext Database Log property  What Gets Logged    - SQL for all different kinds of commands  For example      - Queries  including normal LINQ queries  eSQL queries  and raw queries from methods such as SqlQuery      - Inserts  updates  and deletes generated as part of SaveChanges     - Relationship loading queries such as those generated by lazy loading  - Parameters  - Whether or not the command is being executed asynchronously  - A timestamp indicating when the command started executing  - Whether or not the command completed successfully  failed by throwing an exception  or  for async  was canceled  - Some indication of the result value  - The approximate amount of time it took to execute the command  Note that this is the time from sending the command to getting the result object back  It does not include time to read the results     Example   using  var context   new BlogContext            context Database Log   Console Write        var blog   context Blogs First b   gt  b Title     One Unicorn          blog Posts First   Title    Green Eggs and Ham         blog Posts Add new Post   Title    I do not like them             context SaveChangesAsync   Wait         Output   SELECT TOP  1       Extent1   Id  AS  Id        Extent1   Title  AS  Title      FROM  dbo   Blogs  AS  Extent1      WHERE  N One Unicorn     Extent1   Title   AND   Extent1   Title  IS NOT NULL  -- Executing at 10 8 2013 10 55 41 AM -07 00 -- Completed in 4 ms with result  SqlDataReader  SELECT      Extent1   Id  AS  Id        Extent1   Title  AS  Title        Extent1   BlogId  AS  BlogId      FROM  dbo   Posts  AS  Extent1      WHERE  Extent1   BlogId     EntityKeyValue1 -- EntityKeyValue1   1   Type   Int32  -- Executing at 10 8 2013 10 55 41 AM -07 00 -- Completed in 2 ms with result  SqlDataReader  UPDATE  dbo   Posts  SET  Title     0 WHERE   Id     1  --  0   Green Eggs and Ham   Type   String  Size   -1  --  1   1   Type   Int32  -- Executing asynchronously at 10 8 2013 10 55 41 AM -07 00 -- Completed in 12 ms with result  1  INSERT  dbo   Posts   Title    BlogId   VALUES   0   1  SELECT  Id  FROM  dbo   Posts  WHERE   ROWCOUNT  gt  0 AND  Id    scope identity   --  0   I do not like them    Type   String  Size   -1  --  1   1   Type   Int32  -- Executing asynchronously at 10 8 2013 10 55 41 AM -07 00 -- Completed in 2 ms with result  SqlDataReader   To log to an external file   using  var context   new BlogContext             using  var sqlLogFile   new StreamWriter  C   temp  LogFile txt                             context Database Log   sqlLogFile Write                var blog   context Blogs First b   gt  b Title     One Unicorn              blog Posts First   Title    Green Eggs and Ham             context SaveChanges             More info here  Logging and Intercepting Database Operations

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To have the query always handy  without changing code add this to your DbContext and check it on the output window in visual studio       protected override void OnModelCreating DbModelBuilder modelBuilder                Database Log    query   gt  Debug Write query           Similar to  Matt Nibecker answer  but with this you do not have to add it in your current code  every time you need the query

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If you are using a DbContext  you can do the following to get the SQL   var result   from i in myContext appEntities              select new Model                                 field   i stuff                  var sql   result ToString

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For those using Entity Framework 6 and up  if you want to view the output SQL in Visual Studio  like I did  you have to use the new logging interception functionality   Adding the following line will spit out the generated SQL  along with additional execution-related details  in the Visual Studio output panel   using  MyDatabaseEntities context   new MyDatabaseEntities          context Database Log   s   gt  System Diagnostics Debug WriteLine s          query the database using EF here      More information about logging in EF6 in this nifty blog series  http   blog oneunicorn com 2013 05 08 ef6-sql-logging-part-1-simple-logging   Note  Make sure you are running your project in DEBUG mode

[entity-framework] How do I view the SQL generated by the Entity Framework?

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