README.md

EntityFrameworkCore.DBCopy

Copy database using EFcore This is a project for transferring data between different databases,Even databases of different structures.

Features

Support SQL Server 2008+,SQL Azure,SQL Compact,Oracle,MySQL,PostgreSQL,SQLite.. Staging data to continue importing exports.. Check and list the ShadowPropery. 100% Linq without use rawsql.

Before use this

1.Prepare the migration files for the destination database,An easy way is to inherit your Dbcontext.

 public class AAContext : DbContext
 {
    //you use this Context,like sql server
 }
 
  public class MysqlAAContext : AAContext
 {
    //this Context is using to Mysql
 }
 
  public class PostgresqlAAContext : AAContext
 {
    //this Context is using to Postgresql
 }

You still use AAContext to crud,other Context only use to migrations.

You can map the column type you like

public class AAContext : DbContext
{
   //you use this Context
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
       if (Database.IsNpgsql())
       {
         modelBuilder.HasPostgresExtension("citext");
         modelBuilder.Entity<xxx>().Property(d => d.xxx).HasColumnType("citext");
       }
       if (Database.IsMySql())
       {
        xxxx
       }
    }
}

2.Update your IDesignTimeDbContextFactory

///Default factory
  public class AAContextContextFactory : IDesignTimeDbContextFactory<AAContext>
   {
    
       public AAContext CreateDbContext(string[] args)
       {
           var builder = new DbContextOptionsBuilder<AAContext>();
           builder.UseSqlServer(connectionString);

           return new AAContext(builder.Options);
       }
   }
   ///New factory
  public class MysqlAAContextContextFactory : IDesignTimeDbContextFactory<MysqlAAContext>
   {
    
       public MysqlAAContext CreateDbContext(string[] args)
       {
           var builder = new DbContextOptionsBuilder<MysqlAAContext>();
           builder.UseMySql(connectionString);

           return new MysqlAAContext(builder.Options);
       }
   }

Then call

   dotnet ef migrations add xxx --context MysqlAAContext --output-dir Migrations/MySqlMigrations --project xxxEntityFrameworkCore --startup-project xxx
   dotnet ef database update  --context MysqlAAContext --project xxxEntityFrameworkCore --startup-project xxx

3.Fix Shadow Properties See https://docs.microsoft.com/en-us/ef/core/modeling/shadow-properties You must explicitly declare the shadow property,if you don't, the shadow-properties's data will lose. Fortunately, we check when initialized.You can set IgnoreShadowPropery=true to igonre the error.

Use this project

  var fromoptionsBuilder = new DbContextOptionsBuilder<AAContext>();
      fromoptionsBuilder.UseSqlServer(xxxx);
  var tooptionsBuilder = new DbContextOptionsBuilder<AAContext>();
      tooptionsBuilder.UseMySql(xxxx);
  var fromdboption = fromoptionsBuilder.Options;
  var todboption = tooptionsBuilder.Options;
  var copy = new DBCopyWorker<SkuContext>(fromdboption, todboption);
      copy.Copy();

Attention

This repository use Entity Framework Extensions to bulkinsert temporary.It is not free,but you can get free trial.I will replace this in the funture!