README.md

Scala Common Lib

This project aims to provide a generic common backend interface/impl for java/scala developers.

I32IdGenerator

val idGen = I32IdGenerator("project_a","user_id", ssdb)
val id = idGen.getNextId()

List

val listUserFriends = SsdbList[Int]("user_a", ssdb)

listUserFriends.multiPushFront(Array(1,2,3,4))

val listUserMessages = SsdbList[String]("id")

val listTransaction = SsdbList[Transaction]("user_id")

KeyValueDB

val kvs = SsdbKVS[String,String]("user_db",ssdb)

    kvs.add("user_id","{ json_user_value }")

val value = kvs.get("user_id")

val dbUserProfile = SsdbKVS[Long,UserProfile]("user_profile")

val jackProfile = UserProfile(123,"Jack",19,"jack@x.education")

dbUserProfile.add(123L, jackProfile)

val profile = dbUserProfile.get(123)

SortedSet

    val leaderboard = SSdbSortedSet("game_a",ssdb)
    leaderboard.add("user_1",100)
    val rank = leaderboard.rank("user_1")
    val top10 = leaderboard.range(0,10)

JDBC Client

    val client = NativeJdbcClient("jdbc:mysql://127.0.0.1:9000", "user", "password")
    // Insert a row
    client.executeUpdate(
          s"insert into users(id, name, age, created_date) values(?, ?, ?, ?);",
          1, "user1", 1, new Date(1589446762000L))
          
    // Delete a row          
    val afftedRows = client.executeUpdate(s"delete from users where id = ?", 1)

Usage

```
<dependency>
	<groupId>education.x</groupId>
	<artifactId>common-backend</artifactId>
	<version>2.3-SnapShot</version>
</dependency>
```