elgeql-qb

EdgeQL Query Builder

Query builder for EdgeDB

Description

• Project currently in pre-alpha status. It is not production-ready yet, and It may be buggy and unstable as well.
• The project is not affiliated with the official developers of EdgeDB.
• This project only supports a small part of the EdgeDB syntax.
• The library does not contain any code to connect to the database or to execute queries.
• The library does not introspect the database and will not check if you made a typo somewhere in a column name. What you write is what you get.
• Minimal required version of python is 3.10. Not sure if I'll ever do a backport.
• There is no external dependencies, even on EdgeDB itself.

Usage examples

Many examples of queries are given in the documentation directory.

from edgeql_qb import EdgeDBModel
from edgeql_qb.types import int16
from edgedb.blocking_client import create_client


client = create_client()
Movie = EdgeDBModel('Movie')
Person = EdgeDBModel('Person')

insert = Movie.insert.values(
    title='Blade Runner 2049',
    year=int16(2017),
    director=(
        Person.select()
        .where(Person.c.id == director_id)
        .limit1
    ),
    actors=Person.insert.values(
        first_name='Harrison',
        last_name='Ford',
    ),
).build()


select = (
    Movie.select(
        Movie.c.title,
        Movie.c.year,
        Movie.c.director(
            Movie.c.director.first_name,
            Movie.c.director.last_name,
        ),
        Movie.c.actors(
            Movie.c.actors.first_name,
            Movie.c.actors.last_name,
        ),
    )
    .where(Movie.c.title == 'Blade Runner 2049')
    .build()
)

delete = Movie.delete.where(Movie.c.title == 'Blade Runner 2049').build()

decade = (Movie.c.year // 10).label('decade')
group = Movie.group().using(decade).by(decade).build()

client.query(insert.query, **insert.context)
result = client.query(select.query, **select.context)

movies_by_decade = client.query(group.query, **group.context)

client.query(delete.query, **delete.context)

Status

• Queries:

  • select
    • nested shapes
      • filters for nested shapes
      • order by for nested shapes
      • limit/offset for nested shapes
      • aggregations for nested shapes
    • function calls
    • computed fields
    • filters
      • filter by nested paths
    • limit & offset
    • order by
    • backlinks
    • subqueries
    • polymorphic fields
    • link properties (@notation)
    • detached
  • group
    • columns
    • using
    • by
    • function calls
  • update
    • function calls
    • nested queries
  • delete
    • delete without filters
    • function calls
    • limit & offset
    • order by
  • insert
    • nested inserts
    • conditional inserts
    • idempotent insert
    • select-or-insert
  • function calls
    • positional arguments
    • keyword arguments
  • with block
    • with literal
    • with subquery
    • with module + closure
    • with x := subquery select x
    • with x := subquery group x
    • with x := subquery update x
    • with x := Type.column
  • if statements
  • globals
  • for statements
    • union statements
  • queries without models, like select [1,2,3]

• Types:

  • type casts
  • cal::date_duration
  • cal::relative_duration
  • std::array
  • std::json
  • std::range
  • std::set
  • std::tuple
  • cal::local_date
  • cal::local_date
  • cal::local_datetime
  • cal::local_time
  • std::bigint
  • std::bool
  • std::bytes
  • std::datetime
  • std::decimal
  • std::duration
  • std::float32
  • std::float64
  • std::int16
  • std::int32
  • std::int64
  • std::str
  • std::uuid

• Functions

  • cal
  • math
  • std
  • sys