view generated SQL for Entity Framewok SaveChanges command in Visual studio?

问题

I can see the SQL generated by Entity Framework for select operations in Visual studio, but not for insert, update and delete. how can I see the SQL generated for "DataContext.SaveChanges" command in Visual studio while debugging?

回答1:

If you have visual studio ultimate you can see the updates and inserts in intellitrace. Just put a breakpoint right after SaveChanges is called.

http://www.youtube.com/watch?v=fLBpZNXs-Lw

If you are using it on a web project you could also use mini-profiler.

http://miniprofiler.com/

回答2:

Here's something really simple that I found:

context.Database.Log = x => System.Diagnostics.Debug.WriteLine(x);

回答3:

Have a look at this thread on the MSDN forums; specifically, the post by g_yordanov. He has provided some code which can retrieve the corresponding SQL statements for all of the changes in an EF datacontext.

As a disclaimer, this code involves reflecting on EF's internals, and may break in future versions. But for now, it is working flawlessly in all of our EF apps.

Here is the code, for reference, just in case the link ever disappears.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.Data.Objects;
using System.Data.Common;
using System.Data.EntityClient;
using System.Collections;

namespace EntityExtensionMethods
{
    public static class CustomExtensions
    {
        private static readonly string entityAssemblyName =
            "system.data.entity, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089";

        public static string ToTraceString(this IQueryable query)
        {
            System.Reflection.MethodInfo toTraceStringMethod = query.GetType().GetMethod("ToTraceString");

            if (toTraceStringMethod != null)
                return toTraceStringMethod.Invoke(query, null).ToString();
            else
                return "";
        }

        public static string ToTraceString(this ObjectContext ctx)
        {
            Assembly entityAssemly = Assembly.Load(entityAssemblyName);

            Type updateTranslatorType = entityAssemly.GetType(
                "System.Data.Mapping.Update.Internal.UpdateTranslator");

            Type functionUpdateCommandType = entityAssemly.GetType(
                "System.Data.Mapping.Update.Internal.FunctionUpdateCommand");

            Type dynamicUpdateCommandType = entityAssemly.GetType(
                "System.Data.Mapping.Update.Internal.DynamicUpdateCommand");

            object[] ctorParams = new object[]
                        {
                            ctx.ObjectStateManager,
                            ((EntityConnection)ctx.Connection).GetMetadataWorkspace(),
                            (EntityConnection)ctx.Connection,
                            ctx.CommandTimeout
                        };

            object updateTranslator = Activator.CreateInstance(updateTranslatorType,
                BindingFlags.NonPublic | BindingFlags.Instance, null, ctorParams, null);

            MethodInfo produceCommandsMethod = updateTranslatorType
                .GetMethod("ProduceCommands", BindingFlags.Instance | BindingFlags.NonPublic);
            object updateCommands = produceCommandsMethod.Invoke(updateTranslator, null);

            List<DbCommand> dbCommands = new List<DbCommand>();

            foreach (object o in (IEnumerable)updateCommands)
            {
                if (functionUpdateCommandType.IsInstanceOfType(o))
                {
                    FieldInfo m_dbCommandField = functionUpdateCommandType.GetField(
                        "m_dbCommand", BindingFlags.Instance | BindingFlags.NonPublic);

                    dbCommands.Add((DbCommand)m_dbCommandField.GetValue(o));
                }
                else if (dynamicUpdateCommandType.IsInstanceOfType(o))
                {
                    MethodInfo createCommandMethod = dynamicUpdateCommandType.GetMethod(
                        "CreateCommand", BindingFlags.Instance | BindingFlags.NonPublic);

                    object[] methodParams = new object[]
                    {
                        updateTranslator,
                        new Dictionary<long, object>()
                    };

                    dbCommands.Add((DbCommand)createCommandMethod.Invoke(o, methodParams));
                }
                else
                {
                    throw new NotSupportedException("Unknown UpdateCommand Kind");
                }
            }


            StringBuilder traceString = new StringBuilder();
            foreach (DbCommand command in dbCommands)
            {
                traceString.AppendLine("=============== BEGIN COMMAND ===============");
                traceString.AppendLine();

                traceString.AppendLine(command.CommandText);
                foreach (DbParameter param in command.Parameters)
                {
                    traceString.AppendFormat("{0} = {1}", param.ParameterName, param.Value);
                    traceString.AppendLine();
                }

                traceString.AppendLine();
                traceString.AppendLine("=============== END COMMAND ===============");
            }

            return traceString.ToString();
        }
    }
}

回答4:

I know this is old, but it was the first link that came up in my search so I'd thought I'd post that the easiest solution for me was to use SQL Profiler per:

String or binary data would be truncated.The statement has been terminated

Ooops...just saw that OP does not have access to Profiler, but the link is still good for giving instructions for those that do!

来源：https://stackoverflow.com/questions/9535924/view-generated-sql-for-entity-framewok-savechanges-command-in-visual-studio