找不到适合 jdbc:derby://localhost:1527/prosto 的驱动程序

Question

我的库中有驱动器 derbyclient.jar，但它仍然找不到我的数据库。我只是无法连接到数据库。

String host = "jdbc:derby://localhost:1527/prosto";
String uName = "username";
String uPass = "password";

Connection con = DriverManager.getConnection(host, uName, uPass);

Answer 1

您首先需要加载 derby 驱动程序 class。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 的驱动程序注册表中加载并注册 Derby 驱动程序 class，之后您将能够连接到数据库。

参考这里了解更多详情：

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

Update

derby安装的lib文件夹下应该有一个derbyclient.jar。您还需要将其添加到 class 路径，并使其在运行时可用。这似乎解决了我的问题。

希望对您有所帮助！

Answer 2

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
}


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这是一篇关于在 NetBeans 中更改语言的文章的链接 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/

找不到适合 jdbc:derby://localhost:1527/prosto 的驱动程序

No suitable driver found for jdbc:derby://localhost:1527/prosto

java

driver