데이터베이스 서버에 연결할 수 없습니다 - 이클립스 MySQL 오류

Question

도와 주실 수 있습니까? 이미 jdbc 빌드 경로를 수행하고 DB savetime이 존재합니다.

내 수업 :

package br.com.savetime; 

    import java.sql.*; 

    public class CriarConexao { 

    private static Connection con = null; 

    public static Connection abrirBanco(){ 
     Connection con; 
     try{ 
      Class.forName("com.mysql.jdbc.Driver"); 
      con = DriverManager.getConnection("jdbc:mysql://localhost:3306/savetime", "root", "root"); 
      System.out.println("conectando"); 
      return con; 
     } 
     catch(ClassNotFoundException cnfe){ 
      System.out.println("driver nao encontrado: " + cnfe.getMessage()); 
      return null; 
     } 
     catch(SQLException sql){ 
      System.out.println("SQLException: " + sql.getMessage()); 
      System.out.println("SQLState: " + sql.getSQLState()); 
      System.out.println("Erro: " + sql.getErrorCode()); 
      System.out.println("StackTrace: " + sql.getStackTrace()); 
      return null; 
     } 
     catch(Exception e){ 
      System.out.println(e.getMessage()); 
      return null; 
     } 
    } 

    public static void fecharBDcon(){ 
     try{ 
      con.close(); 
     } 
     catch(Exception e){ 
      System.out.println("erro ao fechar o banco" + e.getMessage()); 
     } 
    } 

} 

내 오류 : 코드가 잘 작동

06-17 03:55:07.139: I/System.out(1367): SQLException: Could not create connection to database server. 

06-17 03:55:07.139: I/System.out(1367): SQLState: 08001 

06-17 03:55:07.139: I/System.out(1367): Erro: 0 

06-17 03:55:07.149: I/System.out(1367): StackTrace: [Ljava.lang.StackTraceElement;@41bc1af0 

Answer 1

바로 찾을 수 있습니다 classpath.We의 mysql-connector.jar을 제공하는 것이 here 내가 시도 당신의 코드 is :

import java.sql.*; 

public class ConnectionTest { 

private static Connection con = null; 

public static Connection abrirBanco(){ 
    Connection con; 
    try{ 
     Class.forName("com.mysql.jdbc.Driver"); 
     con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "welcome"); 
     System.out.println("conectando"); 
     return con; 
    } 
    catch(ClassNotFoundException cnfe){ 
     System.out.println("driver nao encontrado: " + cnfe.getMessage()); 
     return null; 
    } 
    catch(SQLException sql){ 
     System.out.println("SQLException: " + sql.getMessage()); 
     System.out.println("SQLState: " + sql.getSQLState()); 
     System.out.println("Erro: " + sql.getErrorCode()); 
     System.out.println("StackTrace: " + sql.getStackTrace()); 
     return null; 
    } 
    catch(Exception e){ 
     System.out.println(e.getMessage()); 
     return null; 
    } 
} 

public static void fecharBDcon(){ 
    try{ 
     con.close(); 
    } 
    catch(Exception e){ 
     System.out.println("erro ao fechar o banco" + e.getMessage()); 
    } 
} 
public static void main(String arr[]) 
{ 
    System.out.println("Making connection.."); 
    Connection connection = ConnectionTest.abrirBanco(); 
    System.out.println("Connection made..."); 
} 
}