AspNetZero with multiple databases #2317 | Support Center

vnetonline created 8 years ago

Dear Support

I have a requirement to read/write data to another database, however i don't want to run migration on that database ... is that possible.

I have seen a sample project which shows you how to talk to multiple databases however migrations are enabled on both databases.

Thanks in advance for your help

9 Answer(s)

0
ismcagdas created 8 years ago
Support Team
Hi,

You can set database initializer to null, in this way migrations will not be applied.

Database.SetInitializer(new NullDatabaseInitializer<YourDbContext>());
0

vnetonline created 8 years ago

Thanks for your reply.I have managed to setup all the plumbing.

The table in the DB I want to read/write from doesn't have a primary key named Id it has a primary key named Pre_ID and it uses a GUID without the dashes for its Key, I am also can to use the AsyncCrudAppService so that we can expose CRUD via WepAPI.

Can you please let me know how I can achieve this??

Thanks and Kind Regards Vineet Belani
0

ismcagdas created 8 years ago
Support Team

Hi,

You can see this issue for using Pre_ID instead of Id field. <a class="postlink" href="https://github.com/aspnetboilerplate/aspnetboilerplate/issues/586">https://github.com/aspnetboilerplate/as ... issues/586</a>

But I don't know how to convert GUID without the dashes to a regular guid.

vnetonline created 8 years ago

Dear Support

I am still have issues comminicating with a DB on another server here is what I have done

Created a ErpDbContext as follows and defied "Erp" connection string in web.config

public class ErpDbContext : AbpDbContext
    {
        /* Define an IDbSet for each entity of the application */

        //VB - 2017-01-11 - Erp tables
        public virtual IDbSet<Person> Persons { get; set; }


        /* Setting "Default" to base class helps us when working migration commands on Package Manager Console.
         * But it may cause problems when working Migrate.exe of EF. ABP works either way.         * 
         */
        public ErpDbContext()
            : base("Erp")
        {
            
        }


    }

Created a Person Entity in Core project

[Table("Person")]
    public class Person : IEntity<string>
    {

        [Key]
        public virtual string Pre_ID { get; set; }

        public virtual string FirstName { get; set; }

        public virtual string LastName { get; set; }

        public virtual string Salutation { get; set; }

        [NotMapped]
        public string Id
        {
            get
            {
                return Pre_ID;
            }

            set
            {
                Pre_ID = value;
            }
        }

        public bool IsTransient()
        {
            return false;
        }
    }

Created a PersonDto in Application project

[AutoMap(typeof(Person))]
    public class PersonDto : IEntityDto<string>
    {

        public virtual string Pre_ID { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public string Salutation { get; set; }

        public string Id
        {
            get
            {
                return Pre_ID;
            }

            set
            {
                Pre_ID = value;
            }
        }
    }

Created IPersonAppService as follows

public interface IPersonAppService : IAsyncCrudAppService<PersonDto, string, GetAllPersonsInput, CreatePersonInput, UpdatePersonInput>
    {

        Task<ListResultDto<PersonDto>> GetAllPersons();

    }

Created PersonAppService as follows

public class PersonAppService : AsyncCrudAppService<Person, PersonDto, string, GetAllPersonsInput, CreatePersonInput, UpdatePersonInput>,
        IPersonAppService
    {

        public PersonAppService(IRepository<Person, string> personRepository)
            :base(personRepository)
        {

        }

        public async Task<ListResultDto<PersonDto>> GetAllPersons()
        {
            var personList = await Repository.GetAllListAsync();

            return new ListResultDto<PersonDto>(personList.MapTo<List<PersonDto>>());
        }


    }

When I go to Swagger UI I can see the CRUD

app/person Show/Hide List Operations Expand Operations
POST /api/services/app/person/GetAllPersons
POST /api/services/app/person/Get
POST /api/services/app/person/GetAll
POST /api/services/app/person/Create
POST /api/services/app/person/Update
POST /api/services/app/person/Delete

When I try to execute GetAll call I am getting the following error

{
  "result": null,
  "targetUrl": null,
  "success": false,
  "error": {
    "code": 0,
    "message": "An internal error occurred during your request!",
    "details": null,
    "validationErrors": null
  },
  "unAuthorizedRequest": false,
  "__abp": true
}

Thanks in advance for your help

vnetonline created 8 years ago

I have resolved this by looking in the logs file located in App_Data\Logs directory, It turns out i was spelling the Pre_ID wrong where it should be Per_ID.

So Get and GetAll AsyncCrudAppService methods now are working.

My next problem is to do with Create and Update, the existing DB has the Per_ID column set to required and needs to be populated with a unique identifier made out of a GUID with out dashes.

Is there a way i can generate this in my CreatePersonInput. here is what i am trying but i get a Sustem.Overflow error.

[AutoMapTo(typeof(Person))]
    public class CreatePersonInput : IEntityDto<string>
    {

        //public string Id { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public string Salutation { get; set; }

        public string Id
        {
            get
            {
                return Id;
            }

            set
            {
                if (value == "" )
                {
                    Id = Guid.NewGuid().ToString("N").ToUpper();
                }
            }
        }
    }

0

ismcagdas created 8 years ago
Support Team

Hi,

It is better to set Id property in your entities constructor. Can you try that ?
0

vnetonline created 8 years ago

When I try that the Id is written as an empty string, can you please give me sample code how you would do it ??
0

ismcagdas created 8 years ago
Support Team

Can you share your latest code for Person entity ? We can go over that.

vnetonline created 8 years ago

Here is my latest code for person entity in the core project

[Table("Person")]
    public class Person : Entity<string>
    {

        //[Key]
        //public virtual string Pre_ID { get; set; }

        [Column("Per_ID")]
        [DatabaseGenerated(DatabaseGeneratedOption.None)]
        public override string Id { get; set; } 

        public virtual string FirstName { get; set; }

        public virtual string LastName { get; set; }

        public virtual string Salutation { get; set; }

        //[NotMapped]
        //public string Id
        //{
        //    get
        //    {
        //        return Pre_ID;
        //    }

        //    set
        //    {
        //        Pre_ID = value;
        //    }
        //}

        public override bool IsTransient()
        {
            return false;
        }
    }

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