接着上一篇的play framework redis緩存、作爲一個優秀的框架怎麼沒有數據庫操作呢、這篇介紹一下怎麼配置jdbc連接、使用的數據庫是mysql。
使用教程
build.sbt 添加依賴
libraryDependencies += javaJdbc
libraryDependencies += "mysql" % "mysql-connector-java" % "5.1.47"
jdbc配置
db {
default.driver = com.mysql.jdbc.Driver
default.url = "jdbc:mysql://localhost:3306/testdb?characterEncoding=UTF-8&useSSL=false"
default.username = root
default.password = root
default.logSql = true
}
控制器注入使用
@Singleton
class HomeController @Inject()(@NamedDatabase("default") db: Database, cc: ControllerComponents)(implicit assetsFinder: AssetsFinder)
extends AbstractController(cc) {
def index = Action {
val res = new mutable.ListBuffer[String]()
db.withConnection {
conn =>
val state = conn.createStatement()
val result = state.executeQuery("select * from user")
while (result.next()) {
res += result.getString("nickName")
}
}
Ok(views.html.index(res.mkString(",")))
}
}
刷新頁面就可以看到啦
連接池配置
play.db {
# The combination of these two settings results in "db.default" as the
# default JDBC pool:
config = "db"
default = "default"
# Play uses HikariCP as the default connection pool. You can override
# settings by changing the prototype:
prototype {
# Sets a fixed JDBC connection pool size of 50
hikaricp.minimumIdle = 50
hikaricp.maximumPoolSize = 50
}
}
默認初始50個連接
驗證mysql是不是
root@385ff263e2bd:/# mysqladmin -uroot -proot status
mysqladmin: [Warning] Using a password on the command line interface can be insecure.
Uptime: 6053 Threads: 51 Questions: 2898 Slow queries: 0 Opens: 569 Flush tables: 1 Open tables: 384 Queries per second avg: 0.478
可以看到Threads:是51個、有一個連接是其它項目的。
最後
play framework真的很好用、添加代碼動態加載。真的很棒。
下一篇文章繼續介紹在playframework中如何上傳文件。