typesql_parser maintainer

[moshe5745]

Hi.

wanted to ask some question about this package from pub.dev: https://pub.dev/packages/typesql_parser

[juancastillo0]

Hi thanks for the issue.

Yes, you can send the question through this repo. I may be able to help you.

[moshe5745]

First thing first - Where is the repo for this package? I cant find it. The second question is that I understand this is a wrapper on other rust package. So I wanted to understand how it works. I wanted to see the src code(in github) - so this is connected to the first question. Anyway I checked my local files of the package and saw that you using wasm module(super cool). So the third question is that the reason(using wasm module) that the createTypesqlParser is async?

[juancastillo0]

All the directories for each package in the repo are presented in the readme. The typesql_parser source code can be found in the /packages/wasm_packages/typesql_parser directory and the Rust implementation is within the typesql_parser_wasm directory.

That's right, since the compilation of the wasm module may take some time it's better to make it async.

[moshe5745]

I dont see the visitor functionality that present in rust lib. Do you have plans to implement it?

[juancastillo0]

Thanks for your great questions, and sorry there aren't many docs about the package.

The visitor implementation is exposed within the /lib/visitor.dart file and an usage example is the DependenciesVisitor class in the typesql package.

[moshe5745]

I see you started to implement typesql_generator I see its not finished. Am I right?

I am trying to build a generator too. Like sqlc package in golang(But maybe better :))

[juancastillo0]

You can try it out and let me know what you think, it's on pub.dev. I believe it supports most primitives and even JSON. If there is something missing you may create an issue or open a PR.

[moshe5745]

Hmm...

Right now its generating me code with errors. For example:

-- name: complexQuery :many
select employee_id, name, department_id, salary
from employees
where
    (department_id = ? or ? is null)
    and (salary >= ? or ? is null)
    and (hire_date between ? and ? or (? is null and ? is null))
    and (skills->>? = ? OR ? IS NULL)
ORDER BY
    CASE WHEN ? = 'salary' THEN salary END DESC,
    CASE WHEN ? = 'hire_date' THEN hire_date END DESC
LIMIT ? OFFSET ?;

-- name: getUsersByStatus :many
select * from users
where status = ?;

-- name: insertNewUser :exec
insert into users (name, email, status)
values (?, ?, ?);

-- name: getUsersByIds :many
select * from users
where id in (?, ?, ?);

-- name: getUsersByAgeRange :many
select * from users
where age between ? and ?;

-- name: getLimitedUsers :many
select * from users
LIMIT ? offset ?;

-- name: getGroupsByCount :many
select status, count(*)
from users
group by status
having count(*) > ?;

-- name: orderUsersByColumn :many
select * from users
order by ? asc;

Maybe I am using it the wrong way? Tried to delete the comments in this file too with same result.

[juancastillo0]

I believe the error could be due to the name property. You have to configure it as a JSON like the example.

Is there an error? Or perhaps you could provide the generated dart code?

[juancastillo0]

You will also need to provide the CREATE TABLE SQL statements within the .sql file, otherwise the generator will not know which tables and views are available, and their types.