• 数据查看工具: https://github.com/br0xen/boltbrowser
  • 驱动: https://github.com/asdine/storm

初始化

db, err := storm.Open("my.db")
defer db.Close()

  

对象模型

type User struct {
  ID int // primary key
  Group string `storm:"index"` // this field will be indexed
  Email string `storm:"unique"` // this field will be indexed with a unique constraint
  Name string // this field will not be indexed
  Age int `storm:"index"`
}

对象模型storm tag整理

  可以符合使用, 各个值用 , (逗号) 分割

  1. storm:"index"                添加索引
  2. storm:"id"                     主键标识
  3. storm:"increment"          自增字段
  4. storm:"increment=20"     自增字段, 从20开始自增
  5. storm:"unique"               不能重复
  6. storm:"inline"                 内联标记嵌套
  7. storm:"__storm_index_"   ???

保存数据

user := User{
  ID: 10,
  Group: "staff",
  Email: "john@provider.com",
  Name: "John",
  Age: 21,
  CreatedAt: time.Now(),
}

err := db.Save(&user)
// err == nil

user.ID++
err = db.Save(&user)
// err == storm.ErrAlreadyExists

  

修改

// Update multiple fields
err := db.Update(&User{ID: 10, Name: "Jack", Age: 45})

// Update a single field
err := db.UpdateField(&User{ID: 10}, "Age", 0)

  

删除数据

err := db.DeleteStruct(&user)

  

表管理操作

  • 初始化索引 err := db.Init(&User{})
  • 重建索引: err := db.ReIndex(&User{})
  • 删表: err := db.Drop(&User) 或 err := db.Drop("User")

简单查询

var user User
err := db.One("Email", "john@provider.com", &user)
// err == nil

err = db.One("Name", "John", &user)
// err == nil

err = db.One("Name", "Jack", &user)
// err == storm.ErrNotFound

// Fetch multiple objects
var users []User
err := db.Find("Group", "staff", &users)

// Fetch all objects
var users []User
err := db.All(&users)

// Fetch all objects sorted by index
var users []User
err := db.AllByIndex("CreatedAt", &users)

// Fetch a range of objects
var users []User
err := db.Range("Age", 10, 21, &users)

// Fetch objects by prefix
var users []User
err := db.Prefix("Name", "Jo", &users)

// Skip, Limit and Reverse
var users []User
err := db.Find("Group", "staff", &users, storm.Skip(10))
err = db.Find("Group", "staff", &users, storm.Limit(10))
err = db.Find("Group", "staff", &users, storm.Reverse())
err = db.Find("Group", "staff", &users, storm.Limit(10), storm.Skip(10), storm.Reverse())

err = db.All(&users, storm.Limit(10), storm.Skip(10), storm.Reverse())
err = db.AllByIndex("CreatedAt", &users, storm.Limit(10), storm.Skip(10), storm.Reverse())
err = db.Range("Age", 10, 21, &users, storm.Limit(10), storm.Skip(10), storm.Reverse())

  

高级查询

import (
  "github.com/asdine/storm/q"
)
...

// Equality q.Eq("Name", John) // Strictly greater than q.Gt("Age", 7) // Lesser than or equal to q.Lte("Age", 77) // Regex with name that starts with the letter D q.Re("Name", "^D") // In the given slice of values q.In("Group", []string{"Staff", "Admin"}) // Comparing fields q.EqF("FieldName", "SecondFieldName") q.LtF("FieldName", "SecondFieldName") q.GtF("FieldName", "SecondFieldName") q.LteF("FieldName", "SecondFieldName") q.GteF("FieldName", "SecondFieldName") // Match if all match q.And( q.Gt("Age", 7), q.Re("Name", "^D") ) // Matchers can also be combined with And, Or and Not: // Match if one matches q.Or( q.Re("Name", "^A"), q.Not( q.Re("Name", "^B") ), q.Re("Name", "^C"), q.In("Group", []string{"Staff", "Admin"}), q.And( q.StrictEq("Password", []byte(password)), q.Eq("Registered", true) ) ) query := db.Select(q.Gte("Age", 7), q.Lte("Age", 77)) // Calls can also be chained query = query.Limit(10).Skip(20).OrderBy("Age").Reverse() // But also to specify how to fetch them. var users []User err = query.Find(&users) var user User err = query.First(&user) // demo // Examples with Select: / Find all users with an ID between 10 and 100 err = db.Select(q.Gte("ID", 10), q.Lte("ID", 100)).Find(&users) // Nested matchers err = db.Select(q.Or( q.Gt("ID", 50), q.Lt("Age", 21), q.And( q.Eq("Group", "admin"), q.Gte("Age", 21), ), )).Find(&users) query := db.Select(q.Gte("ID", 10), q.Lte("ID", 100)).Limit(10).Skip(5).Reverse().OrderBy("Age", "Name") // Find multiple records err = query.Find(&users) // or err = db.Select(q.Gte("ID", 10), q.Lte("ID", 100)).Limit(10).Skip(5).Reverse().OrderBy("Age", "Name").Find(&users) // Find first record err = query.First(&user) // or err = db.Select(q.Gte("ID", 10), q.Lte("ID", 100)).Limit(10).Skip(5).Reverse().OrderBy("Age", "Name").First(&user) // Delete all matching records err = query.Delete(new(User)) // Fetching records one by one (useful when the bucket contains a lot of records) query = db.Select(q.Gte("ID", 10),q.Lte("ID", 100)).OrderBy("Age", "Name") err = query.Each(new(User), func(record interface{}) error) { u := record.(*User) ... return nil }

  

事务

tx, err := db.Begin(true)
if err != nil {
  return err
}
defer tx.Rollback()

accountA.Amount -= 100
accountB.Amount += 100

err = tx.Save(accountA)
if err != nil {
  return err
}

err = tx.Save(accountB)
if err != nil {
  return err
}

return tx.Commit()

  

不同的数据编码方式

import (
  "github.com/asdine/storm/v3"
  "github.com/asdine/storm/v3/codec/gob"
  "github.com/asdine/storm/v3/codec/json"
  "github.com/asdine/storm/v3/codec/sereal"
  "github.com/asdine/storm/v3/codec/protobuf"
  "github.com/asdine/storm/v3/codec/msgpack"
)

var gobDb, _ = storm.Open("gob.db", storm.Codec(gob.Codec))
var jsonDb, _ = storm.Open("json.db", storm.Codec(json.Codec))
var serealDb, _ = storm.Open("sereal.db", storm.Codec(sereal.Codec))
var protobufDb, _ = storm.Open("protobuf.db", storm.Codec(protobuf.Codec))
var msgpackDb, _ = storm.Open("msgpack.db", storm.Codec(msgpack.Codec))

  

参考连接: http://ystyle.top/2019/12/22/how-to-use-storm-db/