Java实现JDBC连接数据库简单案例

import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class DBM {  public static void main(String[] args){    //数据库连接参数    String driverStr="com.microsoft.sqlserver.jdbc.SQLServerDriver";    String connStr="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=school";// 可以localhost代替ip地址，端口号1433    String dbUserName="sa";    String dbPassword="";    Connection conn = null;    Statement stmt = null;    ResultSet rs = null;    //1.连接数据库    try{      Class.forName(driverStr);      conn = DriverManager.getConnection(connStr,dbUserName,dbPassword);      stmt = conn.createStatement();      System.out.println("数据库建立连接成功！");    }catch(Exception ex){      System.out.println("无法与数据库建立连接！");      System.out.println(ex.toString());    }    //2.查询    try {      rs = stmt.executeQuery("select * from student");    } catch (SQLException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }    //3.显示    try {      while(rs.next()){        System.out.println(rs.getInt("sid")+" "+rs.getString("sname")+" "+rs.getString("ssex")+" "+rs.getInt("sage"));      }    } catch (SQLException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }  }}