没有为jdbc找到合适的驱动程序:derby:// localhost:1527 / prosto

时间:2016-12-20 09:08:27

标签: java driver

屏幕截图中的代码 它是俄语但我想你会用图标来理解它。

以下是图片中的代码。

enter image description here

所以我在我的图书馆里开了derbyclient.jar,但它还没有工作

2 个答案:

答案 0 :(得分:2)

首先需要加载derby驱动程序类。为此,请在DriverManager.getConnection()调用之前添加此代码。

try{
    Class.forName("org.apache.derby.jdbc.ClientDriver");// or may be it is "org.apache.derby.jdbc.EmbeddedDriver"? Not sure. Check the correct name and put it here.
} catch(ClassNotFoundException e){
    //handle exception
}

这将在JDBC驱动程序注册表中加载并注册Derby驱动程序类,之后您将能够连接到数据库。

有关详细信息,请参阅此处:

https://db.apache.org/derby/docs/10.4/devguide/cdevdvlp40653.html

  

更新

derby安装的lib文件夹中应该有一个derbyclient.jar。您还需要将其添加到类路径并在运行时使其可用。这似乎解决了我的问题。

希望这有帮助!

答案 1 :(得分:0)

It simole example for you:

    import java.sql.*;

public class FirstExample {
   // JDBC driver name and database URL
   static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
   static final String DB_URL = "jdbc:mysql://localhost/EMP";  
//You must use driver, but you can use this driver:
// static String DB_URL = "com.mysql.cj.jdbc.Driver";


   static final String USER = "username";
   static final String PASS = "password";

   public static void main(String[] args) {
   Connection conn = null;
   Statement stmt = null;
   try{
      //Register JDBC driver
      Class.forName("com.mysql.jdbc.Driver");

      //Open a connection
      System.out.println("Connecting to database...");
      conn = DriverManager.getConnection(DB_URL,USER,PASS);

      //STEP 4: Execute a query
      System.out.println("Creating statement...");
      stmt = conn.createStatement();
      String sql;
      sql = "SELECT id, first, last, age FROM Employees";
      ResultSet rs = stmt.executeQuery(sql);

      //STEP 5: Extract data from result set
      while(rs.next()){
         //Retrieve by column name
         int id  = rs.getInt("id");
         int age = rs.getInt("age");
         String first = rs.getString("first");
         String last = rs.getString("last");

         //Display values
         System.out.print("ID: " + id);
         System.out.print(", Age: " + age);
         System.out.print(", First: " + first);
         System.out.println(", Last: " + last);
      }
      rs.close();
      stmt.close();
      conn.close();
   }catch(SQLException se){
      se.printStackTrace();
   }catch(Exception e){
      e.printStackTrace();
   }finally{

      try{
         if(stmt!=null)
            stmt.close();
      }catch(SQLException se2){
      }// nothing we can do
      try{
         if(conn!=null)
            conn.close();
      }catch(SQLException se){
         se.printStackTrace();
      }//end finally try
   }//end try
   System.out.println("Goodbye!");
}//end main
}


Также хороший совет- читай и пиши на английском, IDE также свою переведи на английский (а вообще советую Intellij idea, у которой, кстати есть бесплатные лицензии для школьников и студентов.).
NetBeans的

Вотссылканастатьюосменеязыка     http://blog.matros.com.ua/%D0%BA%D0%B0%D0%BA-%D0%B8%D0%B7%D0%BC%D0%B5%D0%BD%D0%B8%D1%82%D1%8C-%D1%8F%D0%B7%D1%8B%D0%BA-%D0%B8%D0%BD%D1%82%D0%B5%D1%80%D1%84%D0%B5%D0%B9%D1%81%D0%B0-%D0%B2-netbeans-7-3-%D0%BD%D0%B0-%D0%B0%D0%BD/