1使用jdbc步骤 a.导入数据库厂商提供的驱动程序(导入jar包) b.加载驱动程序 Class.forName("驱动程序类"); c.获得连接 Connection conn =DriverManager.getConnection(url,username,password); url = "jdbc:数据库://ip地址:端口;数据库"; username="用户名"; password="密码"; d.获得执行sql对象,执行sql返回结果 Statement stat = conn.createStatement(); ResultSet rs = stat.executeQuery("sql语句"); e.处理结果集 while(rs.next()){ Xxxx s = rs.getXxxx("字段名|数字"); } 注意数据下标从1开始 f.释放资源 rs.close(); stat.close(); conn.close();
public class Test1 { private static Logger logger = Logger.getLogger(Test1.class.getName()); public static void main(String[] args) { Connection conn = null; //1.加载驱动 try { Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); } catch (ClassNotFoundException e) { logger.error(e); } //2.建立连接 try{ conn = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;DatabaseName=epet","sa","sa"); System.out.println("建立连接成功"); }catch(SQLException e){ logger.error(e); }finally{ //3.关闭连接 try{ if(null!= conn){ conn.close(); System.out.println("关闭连接成功"); } }catch(SQLException e){ logger.error(e); } } } } public class Test2 { public static void main(String[] args) { try { Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); String url = "jdbc:sqlserver://localhost:1433;databaseName = schoolDB"; String username = "sa"; String password = "sa"; int deptno = 200; String dname = "ww"; String loc = "dd"; Connection conn =DriverManager.getConnection(url,username,password); Statement stat = conn.createStatement(); //增加 String sql = "insert into DEPT(DEPTNO,dname,LOC)values(800,'szb','yiyang')"; //修改 String sql1 = "update DEPT set dname ='szb7' where DEPTNO = 800"; //删除 String sql2="delete from dept where deptno=800"; String sql3= "insert into DEPT(DEPTNO,dname,LOC)values(?,?,?)"; PreparedStatement pst = conn.prepareStatement(sql3); pst.setInt(1, deptno); pst.setString(2, dname); pst.setString(3, loc); pst.executeUpdate(); // stat.executeUpdate(sql3); stat.close(); conn.close(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); }catch(SQLException e){ e.printStackTrace(); } } }