java连接mysql数据库 java连接sql server数据库

在java的应用中，我们经常会对数据库进行必要的操作，下来我们就了解一下如何用java连接mysql数据库 以及java连接sql server数据库

一、mysql

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

public class TestOne {

  private static Connection connection;
  private static Statement statement;
  private static ResultSet result;

  public static void main(String[] args) {
    try {
      //加载jdbc驱动程序
      Class.forName("com.mysql.jdbc.Driver");
      //指明主机名（默认为：127.0.0.1）和端口号（默认为：3306）以及数据库名（必须指定）
      String url = "jdbc:mysql://localhost:3306/test1";
      //与数据库建立连接
      connection =  DriverManager.getConnection(url, "root", "123456");
      //创建一个Statement对象将SQL语句发送到数据库
      statement = connection.createStatement();
      //将查询结果返回给result
      result = statement.executeQuery("select *from user");
      while(result.next()){
 System.out.println("name:" + result.getString(1) + "      password:" + result.getString(2));
      }
      connection.close();
      result.close();
      statement.close();
    } catch (ClassNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }finally{
      try {
 if(connection != null)
   connection.close();
 if(result != null)
   result.close();
 if(statement != null)
   statement.close();
      } catch (SQLException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
      }
    }
  }
}

二、sql server

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

public class TestDemo {

  public static void main(String[] args) {
    String url="jdbc:sqlserver://localhost:1433;DatabaseName=Contellation";
    Connection conn = null;
    try {
      Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
      conn = DriverManager.getConnection(url, "sa", "");
      Statement statement=conn.createStatement();
      ResultSet rs = statement.executeQuery("select * from dbo.登陆表 ");
      while(rs.next()){
 System.out.println("用户名：" + rs.getString(1) + "  密码：" + rs.getString(2));
      }
      conn.close();
    } catch (ClassNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } 
  }
}

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