日日操夜夜添-日日操影院-日日草夜夜操-日日干干-精品一区二区三区波多野结衣-精品一区二区三区高清免费不卡

使用單例設計模式。下面是返回單個對象的 Java 代碼 –

ConnectDatabase.java

import java.sql.Connection;
import java.sql.DriverManager;
public class ConnectDatabase {
   static Connection conn = null;
   public static Connection getConnection() {
      if (conn != null) return conn;
      String database = "test";
      String Username = "root";
      String password = "123456";
      return getConnection(database, Username, password);
   }
   private static Connection getConnection(String databaseName, String UserName, String password) {
      try {
         Class.forName("com.mysql.jdbc.Driver");
         conn = DriverManager.getConnection("jdbc:mysql://localhost/" + databaseName + "?user=" + UserName + "&password=" + password);
      } catch (Exception e) {
         e.printStackTrace();
      }
      return conn;
   }
}

登錄后復制

以下是調用上述方法的類 –

CallConnection.java

import java.sql.Connection;
public class CallConnection {
   public static void main(String[] args) {
      Connection con = ConnectDatabase.getConnection();
      if (con != null) {
         System.out.println("Connection successful !!!");
      }
   }
}   

登錄后復制

輸出

上述輸出內容如下 –

Mon Feb 11 20:15:32 IST 2019 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Connection successful !!!

登錄后復制

以上就是如何在整個Java-MySQL應用程序中使用一個數據庫連接對象？的詳細內容，更多請關注www.92cms.cn其它相關文章！