In-Memory Database

Small in-memory database. It is useful for testing and test environment. Should not be used in production.

Install

get -u github.com/krstak/memorydb

API

// Add adds new item in the collection.
// It return new id as interface{} value
Add func(item interface{}, collection string) interface{}

// FindAll finds all items in the collection.
// It return slice of interface{}
FindAll func(collection string) []interface{}

// FindById finds an item in the collection by given id. 
// It returns item as interface{} and error if item can't be found
FindById func(id interface{}, collection string) (interface{}, error)

// FindBy finds an item in the collection by given field and value.
// It returns item as interface{} and error if item can't be found
FindBy func(field, value, collection string) (interface{}, error)

// Update updates an item with given id in the collection.
// It returns error if item can't be updated
Update func(id interface{}, item interface{}, collection string) error

// Remove removes an item from the collection.
// It returns error if item can't be removed
Remove func(id interface{}, collection string) error

Usage

Create database

db := memorydb.Create()

Entity to persist

In order to save some struct in db, it should have a required identifier. Default identifier is Id. Possible identifier types are: int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, string Everything else is optional.

type book struct {
	Id     string
	isbn   string
	name   string
	author string
}

Custom identifier

db := memorydb.Create()
db.Identifier("ID")

Write to database

memBook := book{isbn: "1234567", name: "In-Memory DB", author: "Marko Krstic"}
id := db.Add(&memBook, "books")

Find all

books := db.FindAll("books")
bk := books[0].(*book)

Find by Id

bk, err := db.FindById(id, "books")
b := bk.(*book)

Find by custom field

bk, err := db.FindBy("isbn", "1234567", "books")
b := bk.(*book)

Update

bk := book{isbn: "222", name: "In-Memory DB", author: "Marko Krstic"}
err := db.Update(id, &bk, "books")

Remove

err := db.Remove(id, "books")