exposed-wiki/DataBase-and-DataSource.md

Working with DataBase and DataSource

Every database access using Expose is starting by obtaining a connection and creating a transaction.

To get a connection:

val db = Database.connect("jdbc:h2:mem:test", driver = "org.h2.Driver")

It is also possible to provide javax.sql.DataSource for advanced behaviors such as connection pooling:

val db = Database.connect(dataSource)

• Note: Starting Exposed 0.10 executing this code more than once per db will create leaks in your application, hence it is recommended to store it for later use.

For example:

object DbSettings {
   val db by lazy { 
       Database.connect(...)
   }
}

DataSource

• PostgreSQL
• MySQL

  Code:
  Database.connect("jdbc:mysql://localhost:3306/niuniu_server",driver = "com.mysql.jdbc.Driver", user = "root", password = "your_pwd")
  Gradle:
  maven{ url 'https://mvnrepository.com/artifac/'}
  compile "mysql:mysql-connector-java:5.1.46"

• Oracle

• SQLite

  Code:
  Database.connect("jdbc:sqlite:/data/data.db", "org.sqlite.JDBC")
  Gradle:
  maven{ url 'https://mvnrepository.com/artifac/'}
  compile group: 'org.xerial', name: 'sqlite-jdbc', version: '3.21.0.1'

• H2
• SQL Server