import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class MainSql {
  // JDBC 驅(qū)動(dòng)名及數(shù)據(jù)庫 URL
  static final String JDBC_DRIVER = "com.mysql.jdbc.Driver"; 
  static final String DB_URL = "jdbc:mysql://localhost:3306/chat";
 
  // 數(shù)據(jù)庫的用戶名與密碼，需要根據(jù)自己的設(shè)置
  static final String USER = "root";
  static final String PASS = "";
  public static void main(String[] args) {
    // TODO Auto-generated method stub
    Connection conn = null;
    Statement stmt = null;
    try{
      Class.forName(JDBC_DRIVER);
      System.out.println("鏈接數(shù)據(jù)庫..");
      conn = DriverManager.getConnection(DB_URL,USER,PASS);
      stmt = conn.createStatement();
      String sql = "SELECT * FROM users";
      ResultSet rs = stmt.executeQuery(sql);
      while(rs.next()){
        // 通過字段檢索
        String id = rs.getString("id");
        String password = rs.getString("passwd");
  
        // 輸出數(shù)據(jù)
        System.out.println("用戶名: " + id);
        System.out.println("密碼: " + password);
      }
      rs.close();
      stmt.close();
      conn.close();
    }catch(SQLException se){
      // 處理 JDBC 錯(cuò)誤
      se.printStackTrace();
    }catch(Exception e){
      // 處理 Class.forName 錯(cuò)誤
      e.printStackTrace();
    }finally{
      // 關(guān)閉資源
      try{
        if(stmt!=null) stmt.close();
      }catch(SQLException se2){
      }// 什么都不做
      try{
        if(conn!=null) conn.close();
      }catch(SQLException se){
        se.printStackTrace();
      }
    }
    System.out.println("Goodbye!");
  }
}