- 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
- storm:"index" 添加索引
- storm:"id" 主键标识
- storm:"increment" 自增字段
- storm:"increment=20" 自增字段, 从20开始自增
- storm:"unique" 不能重复
- storm:"inline" 内联标记嵌套
- storm:"__storm_index_" ???
保存数据
user := User{ ID: 10, Group: "staff", Email: "[email protected]", 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", "[email protected]", &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/