实体框架5.0代码优先于WPF中的MySQL

Question

This walkthrough works great with SQL Express: http://msdn.microsoft.com/en-us/library/gg197522(v=VS.103).aspx

I would like it to work with MySQL. I've done some research but none of the techniques I've found has been able to do it for me. Ideally I would like to do something like this:

      <entityFramework>
    <defaultConnectionFactory type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data" />
  </entityFramework>

This doesn't work (I have MySQL Connector Net 6.5.4 installed & MySql.Data referenced). I've tried deriving from IDbConnection factory as shown in this class here: http://www.vworker.com/RentACoder/misc/BidRequests/ShowBidRequest.asp?lngBidRequestId=1563829

and then using:

      <entityFramework>
<defaultConnectionFactory type="SchoolModel.MySqlConnectionFactory, SchoolModel" />

but that doesn't work either. Can anybody please give me some pointers as to how to get this to work?

Many thanks.

Answer 1

To use Connector 6.5.4 with code-first EF5 on VS2012 you need:

1. Install MySql Connector 6.5.4 msi

2. Open VS2012 x86 Command Prompt as Admin and execute:

   gacutil /i "C:\\Program Files (x86)\\MySQL\\Connector NET 6.5.4\\Assemblies\\v4.0\\mysql.data.dll" gacutil /i "C:\\Program Files (x86)\\MySQL\\Connector NET 6.5.4\\Assemblies\\v4.0\\mysql.data.entity.dll"

3. Add in your project's App.config this code to <configuration> section:

    <system.data> <DbProviderFactories> <remove invariant="MySql.Data.MySqlClient" /> <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.5.4.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" /> </DbProviderFactories> </system.data> 

4. Now add references to MySql.Data and MySql.Data.Entity to your solution and some code like this (I create MySqlConnection, then pass it to constructor of MyDbContext)

    public class MyDbContext : DbContext { public MyDbContext(DbConnection connection) : base(connection, true) { } ​public DbSet<Product> Products { get; set; } } [Table("sund_jshopping_products")] public class Product { [Key] [Column("product_id")] public int Id { get; set; } [Column("product_ean")] public string Ean { get; set; } [Column("product_manufacturer_id")] public int OperatorId { get; set; } [Column("months_status")] public string MonthsStatus { get; set; } [Column("extra_field_5")] public string SideId { get; set; } } 

Answer 2

Connector 6.5.4 does not support code-first with EF 5. Actually it does not support code first.

You can try using dot net connector (at least the trial version).

Answer 3

Did you set the Datasource to MySQL while setting up your db connection. Also, click and make sure "Test Connection" succeeds before trying a connection directly from the code.