Java与Scala的两种简易版连接池
Java版简易版连接池:
import java.sql.Connection;import java.sql.DriverManager;
import java.util.LinkedList;
/**
* 简易版的连接池
*/
public class ConnectionPool {
//静态的Connection
private static LinkedList<Connection>connections;
//加载驱动
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
//获取连接 多线程访问并发问题控制
public synchronized static Connection getConnectoin(){
try {
if (connections==null){
connections=new LinkedList<Connection>();
for (int i =0;i<10;i++){
Connection conn=DriverManager.getConnection(
"jdbc:mysql://localhost:3306/spark",
"username",
"password"
);
connections.push(conn);
}
}
}catch (Exception e){
e.printStackTrace();
}
return connections.poll();
}
/**
* 还连接
* 返回连接
*/
public static void returnConnection(Connection conn){
connections.push(conn);
}
}
scala版简易版连接池:
object ConnectionPoolUtil {/**
* 需要设置的连接池数据
*/
private val max=10//连接池总数
private val connectionNum=10//每次产生连接数
private val pool=new util.LinkedList[Connection]()
private var conNum=0//当前连接池已经产生的连接数
//获取连接
def getConnections(): Connection ={
//同步代码块
AnyRef.synchronized({
//加载驱动
for(i<-1 to connectionNum){
val conn = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/spark",
"username",
"password"
)
pool.push(conn)
conNum+=1
}
pool.poll()
})
}
//加载驱动
def GetConn(): Unit ={
//控制加载
if (conNum<max && pool.isEmpty){
Class.forName("com.mysql.jdbc.mysql.")
}else if(conNum>=max&&pool.isEmpty){
println("Jdbc Pool had no connection now,please wait a moments")
Thread.sleep(2000)
GetConn()
}
}
//还连接
def returnConn(conn:Connection): Unit ={
pool.push(conn)
}
}
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