在golang中从结构生成最小的嵌入式数据库

Mímir

Generates code for an embedded database with minimal API from structs in golang.

map[string]interface{}

Mímir[]bytemap[string]interface{}

time.Time

The store operates on top of leveldb. Mímir is a wisdom deity from the Norse mythology.

Contribution of all kind is welcome!

example structs (structs.go):

package main

//Person ...
type Person struct {
	Name, Lastname string
	Age            int `index:"Age"`
	Addresses      []*address
}

type address struct {
	Street     string
	Number     int
	PostalCode string
	City       string `index:"AddressCity"`
}

mimir structs.go

Usage:

//Open db file
db, err := OpenDB("/tmp/mimirdb")
if err != nil {
	panic(err)
}
defer db.Close()

//Get the Persons Collection
persons := db.Persons

//Add an person to db
id, err := persons.Add(&Person{
	Name: "Foo",
	Lastname: "Bar",
	Addresses: []*address{&address{Street: "Valhalla", Number: 404, City: "Asgard"}},
})
if err != nil {
    panic(err)
}

//Get the person by id
person, err := persons.Get(id)
if err != nil {
    panic(err)
}

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

//Delete person by id
err := persons.Delete(id)
if err != nil {
    panic(err)
}

//Iterate trough the all persons in the Persons Collection
iter := persons.All()
defer iter.Release() //iter must be released
for iter.Next() {
	p, err := iter.Value()
	if err != nil {
    	panic(err)
	}
	fmt.Println(p.Name, p.Lastname, p.Age)
}

Person.Age"Age"address.City"AddressCity""AddressCity"

//Iterating through persons with Age in range 30-40 (if passed nil it means -/+ infinity)
fromAge, toAge := 30, 40
iter := db.Persons.AgeRange(&fromAge, &toAge)
defer iter.Release()
for iter.Next() {
	p, err := iter.Value()
	if err != nil {
    	panic(err)
	}
	fmt.Println(p.Name, p.Lastname, p.Age)
}

//Iterating through persons which have city in address equal to "London"
iter := db.Persons.AddressCityEq("London")
defer iter.Release()
for iter.Next() {
	p, err := iter.Value()
	if err != nil {
    	panic(err)
	}
	fmt.Println(p.Name, p.Lastname, p.Age)
}