ent 基本使用十八 查询谓词

ent 生成的代码包含了比较完整的查询谓词

字段谓词

• Bool:
  • =, !=
• Numeric:
  • =, !=, >, <, >=, <=,
  • IN, NOT IN
• Time:
  • =, !=, >, <, >=, <=
  • IN, NOT IN
• String:
  • =, !=, >, <, >=, <=
  • IN, NOT IN
  • Contains, HasPrefix, HasSuffix
  • ContainsFold, EqualFold (SQL specific)
• Optional fields:
  • IsNil, NotNil

edge 谓词

• HasEdge

 client.Pet.

      Query().

      Where(user.HasOwner()).

      All(ctx)

 

• HasEdgeWith

 client.Pet.

      Query().

      Where(user.HasOwnerWith(user.Name("a8m"))).

      All(ctx)

Not

client.Pet.

    Query().

    Where(user.Not(user.NameHasPrefix("Ari"))).

    All(ctx)

OR

client.Pet.

    Query().

    Where(

        user.Or(

            user.HasOwner(),

            user.Not(user.HasFriends()),

        )

    ).

    All(ctx)

AND

client.Pet.

    Query().

    Where(

        user.And(

            user.HasOwner(),

            user.Not(user.HasFriends()),

        )

    ).

    All(ctx)

参考资料

https://entgo.io/docs/predicates/