SQL statement logs that are automatically generated and executed by the ef-logger

In EntityFramework's Codefirst mode, we want to log the SQL statements and execution procedures generated automatically by the program to the logs for easy viewing and analysis later.

In the 6.x version of EF, there is a Database attribute in DbContext, and Database.Log is used to specifically record such logs.

Database.Log is a action<string> delegate that assigns a value to a function on the line.

The code is as follows:

usingModel;usingSystem;usingSystem.Collections.Generic;usingSystem.Data.Entity;usingSystem.Linq;usingSystem.Text;usingSystem.Threading;usingSystem.Threading.Tasks;namespaceDAL { Public classDemocontext:dbcontext {//connection string using the Name=efdemo         PublicDemocontext ():Base("EFDemo") {            //set the database initialization to the latest version of the Migration (update) database//democontext mapping databases and tables//DAL. Migrations.configuration is the migration configurationDatabase.setinitializer (NewMigratedatabasetolatestversion<democontext, DAL. Migrations.configuration>()); //logs the executed SQL statement to the logDatabase.Log = Message=>console.writeline ("[{0}]{1}--{2}", Thread.currentthread.managedthreadid,datetime.now.tostring ("YYYY/MM/DD HH:mm:ss.fff"), message.        Trim ()); }        //students property corresponds to the student table in the database         Public VirtualDbset<student> Students {Get;Set; } protected Override voidonmodelcreating (Dbmodelbuilder modelBuilder) {Base.        Onmodelcreating (ModelBuilder); }    }}

The code in the application is as follows:

using(Democontext context =NewDemocontext ()) {                //forcing a database to be created before using the model class true: Force creationContext. Database.initialize (true); #regionNewStudent Stu=NewStudent {Name="Zhaozicheng", BirthDay= DateTime.Parse ("1990-08-01"), age= -                }; //Add a new student entity, equivalent to a new data in the student tablecontext.                              Students.add (Stu); //Savecontext.                              SaveChanges (); #endregion}

The results of the log record are as follows:

[Ten] ./ -/ in  -: $:28.971--Opened connection at ./ -/ in  -: $: -+ ,:xx[Ten] ./ -/ in  -: $:28.972--Started transaction at ./ -/ in  -: $: -+ ,:xx[Ten] ./ -/ in  -: $:28.977--DECLARE @generated_keys table ([ID] uniqueidentifier) INSERT [dbo]. [Student] ([Name], [BirthDay], [age], [Address]) OUTPUT inserted. [ID] into @generated_keysVALUES (@0, @1, @2, NULL) SELECT T.[id], T.[rowversion]from @generated_keys as G JOIN [dbo]. [Student] As T on G.[id]=T.[id]where @ @ROWCOUNT>0[Ten] ./ -/ in  -: $:28.977--[Ten] ./ -/ in  -: $:28.978-- -- @0:'Zhaozicheng'(Type = String, Size = -)[Ten] ./ -/ in  -: $:28.978-- -- @1:'1990/08/01 00:00:00'(Type =DateTime2) [Ten] ./ -/ in  -: $:28.978-- -- @2:' -'(Type =Int32) [Ten] ./ -/ in  -: $:28.978----Executing at ./ -/ in  -: $: -+ ,:xx[Ten] ./ -/ in  -: $:28.993----Completedinch  -ms with result:sqldatareader[Ten] ./ -/ in  -: $:28.993--[Ten] ./ -/ in  -: $:28.995--Committed transaction at ./ -/ in  -: $: -+ ,:xx[Ten] ./ -/ in  -: $:28.996--Closed connection at ./ -/ in  -: $: -+ ,:xx

SQL statement logs that are automatically generated and executed by the ef-logger