microo8 / mimir

Generates minimal embedded database from structs in golang; moved to gitlab.com/microo8/mimir

Project moved to gitlab.com/microo8/mimir

mimir's Issues

Qt

I like this codgen approach.

I need to get this working with therecipe/Qt code, which I noticed your also using. So that would be a good test case.

So am happy to work on this with you if you want

rand.Int() not the best way for the id.

1. Collisions should not be allowed.
2. ID range may be very large(In my current project I'm not sure that's enough uint64).

I propose to use []byte as an identifier.
You can allow the user to select the number of bytes for the index.
And a choice of two options:

1. autoincrement (without affecting the user part of mimir)
   something like that:

func inc(b []byte) {
    for j := 0; j < len(b); j++ {
        b[j]++
        if b[j] > 0 {
            break
        }
    }
}

1. User-defined identifier in operations
   something like that:
   persons.AddWithId([]byte{0,0,0,1}, person)
   Anyway, rand.Int() not the best way for the identifier field in production.

I would expect you to address this issue, because I greatly enjoyed mimir use in my new project.

Structure with field type []byte is not working.

Simple struct

type ByteStruct struct {
    ByteTest []byte `index:"ByteTest"`
}

does not work with mimir.

Generate error: format source error: $374:21: expected operand, found ']' (and 10 more errors)

any option to support multiple tags?

This is how to write multiple in tag.
http://stackoverflow.com/questions/18635671/how-to-define-multiple-name-tags-in-a-struct

For example:

what about considering support struct like this:

type HeartBeat struct {
	Ip        string    `index:"ip" json:"ip"`
	Version   string    `index:"version" json:"version"`
	CreatedAt time.Time `index:"created_at" json:"created_at"`
	Status    string    `json:"status"`
	// DeletedAt time.Time `index:"deleted_at"`
}

test2

could you put a .sh script in to show how to run the generation ?

Update function in template does not work correctly

Following code results in the following error (the first iteration of the last loop):
"unexpected end of JSON input"

This error does not occur without "persons.Update".

$GOPATH/mypackage/db/structs.go:

package db

type Person struct {
    Name string
    Age            int `index:"Age"`
}

$GOPATH/mypackage/main.go:

package main

import (
    "os"
    "mypackage/db"
    "fmt"
    "encoding/json"
)

func main() {
    os.RemoveAll("testdb")
    db2, err := db.OpenDB("dbb", json.Marshal, json.Unmarshal)
    if err != nil {
        fmt.Println(err)
        os.Exit(1)
    }

    persons := db2.Persons()
    id, err := persons.Add(&db.Person{
        Name: "Foo",
        Age: 20,
    })

    if err != nil {
        panic(err)
    }

    person, err := persons.Get(id)
    if err != nil {
        panic(err)
    }
    fmt.Println(person.Name, person.Age)

    person.Name = "Meh"
    err = persons.Update(id, person)
    if err != nil {
        panic(err)
    }

    iter := persons.All()
    for iter.Next() {
        p,err := iter.Value()
        if err!=nil {
            fmt.Println(err)
            os.Exit(1)
        }
        fmt.Println(p.Name, p.Age)
    }
}

Functions "Add" and "Update" in the template must be the same, except for a few lines
But I can see the difference:
Add:

err = col.db.{{$structName}}s().addIndex([]byte("${{$structName}}"), batch, id, obj)

Update:

err = col.addIndex([]byte("{{$structName}}"), batch, id, obj)

Also in the template is not a function "Delete", which is in the examples.

Sometimes the ID cannot be loaded from index