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(); } } } } /** * mysql> select *from user; *+----------+----------+ *| name | password | *+----------+----------+ *| lisi | 123456 | *| wangwu | 123456 | *| zhangsan | 123456 | *+----------+----------+ *3 rows in set (0.54 sec) * *在java中的输出结果 *name:lisi password:123456 *name:wangwu password:123456 *name:zhangsan password:123456 */
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(); } } } /** * java中的输出结果 * 用户名:张三 密码:123456 *用户名:李四 密码:111111 *用户名:王五 密码:123654 *用户名:王延暾 密码:0123456789 *用户名:曾安新 密码:123456 */
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