[英]Singleton connection object creation in java using jdbc
I am trying to create a connection object using singleton design pattern.Is this the right way to do.我正在尝试使用单例设计模式创建一个连接对象。这是正确的做法吗? Please help me with the appropriate way of doing this.
请帮助我以适当的方式执行此操作。
package com.cisco.installbase.hiveconnector;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Connection;
public class CreateConnection {
private static Connection connection = null;
static final String drivername = "org.apache.hive.jdbc.HiveDriver";
private static CreateConnection instance;
private CreateConnection() {
try{
Class.forName(drivername);
connection = DriverManager.getConnection("jdbc:hive2://hddev-c01-edge-01:50045/","phodisvc","B1GD4T4dev");
}catch(ClassNotFoundException e){
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}
public static CreateConnection getInstance()
{
if(instance == null)
{
instance = new CreateConnection();
}
return instance;
}
}
Take my example it works.以我的例子为例。 (Just replace the URL, username and password with yours)
(只需将 URL、用户名和密码替换为您的)
public class DatabaseConnection {
public static Connection con = null;
public static void dbConnect(String drv, String url, String usr, String pwd) {
// CHARGEMENT DU PILOTE
try {
Class.forName(drv);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// CONNEXION BDD
try {
con = DriverManager.getConnection(url, usr, pwd);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} }
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