CODEWITHSUNDEEP
postgresqlentity-framework-corec#-9.0
Sachin Kainth
Sachin Kainth

Reputation: 46750

Query Postgres Json Field using EF Core 5

I have the following table definition

  [Table("MyTable")]
  public class MyTable: BaseEntity
  {
    [Required]
    public string A{ get; set; }

    [Required]
    [Column(TypeName = "json")]
    public string B{ get; set; }
  }

Column B looks like this:

{"Data": [{"Id":"b8a3cbbc-a4d6-4697-8a0b-cb1d15be179d"}]} (aside from Id there are other properties but for brevity I removed them)

In Entity Framework I want to match all MyTable's where the Id in B is a certain value and A has a certain value. I have tried a lot of things and get numerous errors. How can I add to the following code to achieve what I want?

var results = 
   _repository.Get<MyTable>(_ => _.A == "Something" && _.B = ???);

Upvotes: 2

Views: 5187

Answers (1)

Mitko Keckaroski
Mitko Keckaroski

Reputation: 1040

You can use "EF.Functions.JsonContains" function, but the B column needs to be "jsonb" type instead of "json".

    [Required]
    [Column(TypeName = "jsonb")]
    public string B { get; set; }

Example:

var search = "[{\"Id\": \"b8a3cbbc-a4d6-4697-8a0b-cb1d15be179d\"}]";
var results = _context.MyTable2
      .Where(_ => _.A == "Something" 
                    && EF.Functions.JsonContains(_.B, search));

Similar answer HERE

Also, you can type your query and use Dapper.

Example:

 with temp AS(
  select t."Id", t."A", json_array_elements(t."B"->'Data') as B1 from "MyTable"  t
  )
  select * from temp t
  where 
  t."A"='Something' and
  t.b1->>'Id'='b9a3cbbc-a4d6-4697-8a0b-cb1d15be179a'

Upvotes: 4

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