entity framework mysql

Adding a MySQL model to the Entity Framework requires that the SQL statement be executed directly during code writing.@currank: = 0 is used in SQL statements to define parameters in an SQL statement, along with incoming parameters: Ai.action_time >= ' @startTime ',An error will be taken during the execution.Workaround, add the following in the connection database

Label:For an introduction to how to use the EF Power tool, see http://www.cnblogs.com/LingzhiSun/archive/2011/05/24/EFPowerTool_1.html, which is no longer verbose. MySQL has a default sample database in the world, with three tables in it, Download the entity Framework Power Tools installation package, which is now the BETA3 version, http://visualstudiogallery.ms

Original: About MySQL Entity Framework 6 execute like query problem solutionI am not good at words, straight to the pointEnvironment: Ef6.0.0.0+mysql server5.6+mysqlconnector6.9.5.0The problem points are as follows:1 varUsername ="Admin";2 varLST = Userservice.getquery (). Where (p =p.username.contains (U

The Entity Framework uses the MySQL configuration file

\entitysix\EFLog\LogOutput.txt"/> "false"Type="System.Boolean"/> After running, you can view theOpened connection at the/9/ - -: +: the+ ,:xxSELECT ' Extent2 '. ' id ', ' Extent2 '. ' Code ', ' Extent2 '. ' Name ' from ' Prod_category_vs_prod ' as ' Extent1 ' INNER JOIN ' prod ' As ' Extent2 ' on ' Extent1 '. ' prod_category_id '=' Extent2 '. ' id ' WHERE ' Extent1 '. ' prod_id '=@EntityKeyValue1--EntityKeyValue1:'2'(Type = Int32, isnullable =false)--Executing at the/9/ - -: +: the+ ,:xx--Comp

When doing projects, we usually have several processing modes for optimistic concurrency1. Tell the user that the data has been changed by someone else. You'll have to start again.2. Cover the data directly, I'm the biggest.3. Use the data of the person.Here's how code first is done.[Table ("Product")][jsonobject (isreference=true)] Public classproduct{[Key] Public intID {Get;Set; } Public stringCode {Get;Set; } PublicDateTime dateCreated {Get;Set; } [Concurrencycheck]//Key PublicDateTime

1"1.0"encoding="Utf-8"?>234"EntityFramework"Type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, version=6.0.0.0, culture= Neutral, publickeytoken=b77a5c561934e089"requirepermission="false"/>56 78"defaultconnection"connectionstring="server=192.168.1.251; User id=root;password=; Persist Security info=true; Character Set=utf8;database=yunzhi"Providername="MySql.Data.MySqlClient"/>9Ten One A"System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFram

Tags: des style blog http color io os ar forStatement: The database is MySQL, I only to the extent of writing SQL statements (no saving process), C # will be the basic ADO Database Access, LINQ Foundation.This one only does personal study | review function. Novice can refer to, also please master wrong, Thanksgiving.The Entity Framework (abbreviated EF) is a

; option = (from X in Db.options where x.optionname = = option_name X.userid = = 0 select x). Singleordefault ()?? null; if (null! = option) { return option. OptionValue; } } Return ""; } catch (Exception ex) { return ""; } } If you

] =NewMysqlparameter ("@fixperson", Fixperson); prams[8] =NewMysqlparameter ("@currentstatus", Currentstatus); prams[9] =NewMysqlparameter ("@orderhandle", Orderhandle); prams[Ten] =NewMysqlparameter ("@handletype", Handletype); using(Cnpsim_dbentities DbManager =Newcnpsim_dbentities ()) { varindex = dbmanager.database.sqlquerystring> ("Call Insertworkorderinfo (@personindex, @businessindex, @systemstatus, @providerindex, @alarmindex, @orderlevel, @ Exceptfixtime, @fixperson,

'. ' Lasteditip ', ' Extent1 '. ' Password ', ' Extent1 '. ' Realname ', ' Extent1 '. ' Statusid ', ' Extent1 '. ' TypeId ', ' Extent1 '. ' UserName ' from 'UserasWHERE (LOCATE (TRIM ( ' Admin ' > 0 Although not translated into like query, but translated into a locate query!! It's a wonderful, expert explanation.But locate query efficiency is higher than like query!!As follows:===========================================Although the problem is temporarily resolved, but the reason is unc

Mysqlparameter ("@systemstatus", systemstatus); PRAMS[3] = new Mysqlparameter ("@providerindex", Providerindex); PRAMS[4] = new Mysqlparameter ("@alarmindex", aLarmindex); PRAMS[5] = new Mysqlparameter ("@orderlevel", orderlevel); PRAMS[6] = new Mysqlparameter ("@exceptfixtime", 24); PRAMS[7] = new Mysqlparameter ("@fixperson", Fixperson); PRAMS[8] = new Mysqlparameter ("@currentstatus", currentstatus);

the database content has been modified. The contents of the discovery database have been modified Attention: When using EF. extened, when changing the entity, need to migrate the database, need to want to dbcontext inside the Modelbuilder.hasdefaultschema (""); // add comments to the configuration migration remove annotations when running Comments. After the migration is complete, remove the comment. DescriptionThis is the problem I enco

Label:Transferred from: http://fenglongsheng.com/post/6640.htmlToday write a mvc4+entity framework+mysql Small example, found that the Chinese write to the database is n a question mark (garbled oh ~);I followed the code and found that the data submitted by the page was normal, which indicates that there was a problem with EF writing to the database.In order to f

Tags: blog http io ar os using SP data onFor an introduction to how to use the EF Power tool, see http://www.cnblogs.com/LingzhiSun/archive/2011/05/24/EFPowerTool_1.html, which is no longer verbose.MySQL has a default sample database in the world, with three tables in it,Download the entity Framework Power Tools installation package, which is now the BETA3 version, http://visualstudiogallery.msdn.microsoft.

The formation of Entity Framework object Framework -- separation and combination of the data transmission model DTO and Entity model Entity, dtoentity When using the Entity Framework, m

stringPWD {Get;Set; } } Public Partial classOrclcontext:dbcontext { PublicOrclcontext ():Base("Name=orclcontext") { } Public VirtualDbsetGet;Set; } Public VirtualDbsetGet;Set; } Public VirtualDbsetGet;Set; } protected Override voidonmodelcreating (Dbmodelbuilder modelBuilder) { Modelbuilder.hasdefaultschema ( "User_snapsia"); DBO schema in Oracle database for user name modelbuilder.entity() . Property (e=e.id). Isunicode (false); } } Two issues du

1.cmd2.C:\USERS\ADMINISTRATOR>CD C:\Program files\mysql\mysql Server 5.7\bin3c:\program files\mysql\mysql Server 5.7\bin>mysql-h localhost-u root-p4.Enter Password: Database password5.use table name ;6.set Global optimizer_switch= ' Derived_merge=off ';7. Finally success!Whe

{ Public stringOffice {Get;Set; } }Fluent API protected Override void onmodelcreating (Dbmodelbuilder modelBuilder) { modelbuilder.entity(). On person Map"Student")). Map additional 2 table, "Student" is tablename Map"Teacher ")); Base . Onmodelcreating (ModelBuilder); }Insert words directly instantiate the word class can be DB.STUDENTS.ADD (new Student { "keatkeat", " 1 B " }); Db. SaveChanges ();View Code1 Table mode:

()) { /*Insert*/Db.members.Add (NewMember {Name="keatkeat", Address=NewAddress {Postcode="81300", Country="Malaysia" } }); Db. SaveChanges (); /*Select*/ varMembers = Db.members.Include (M = m.address). ToList ();//you want the include to come out together, huh ? /*Update*/ varmember = Db.members.Include (M = m.address). First (). Name ="xinyao123"; Db. SaveChanges (); /*Delete*/Db.members.Remove (Db.members.Include (M= m.address). First ());//include to del