JDBC加载数据库驱动的三种方法

import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;//JDBC加载数据库驱动的三种方法，此处是以sqlserver为例class PreparedStatementDemo {static{Connection conn = null;String sql = "select * from 账户";String url="jdbc:sqlserver://localhost:1433;Database=JDBCWEB";try
{//第一种Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");//第二种//System.setProperty("jdbc.drivers", "com.microsoft.sqlserver.jdbc.SQLServerDriver");//第三种//new com.microsoft.sqlserver.jdbc.SQLServerDriver();conn = DriverManager.getConnection(url,"sa","123456");System.out.println("连接成功");PreparedStatement
pstmt = conn.prepareStatement(sql);ResultSet rs = pstmt.executeQuery();while(rs.next()){System.out.println (rs.getInt(1));System.out.println (rs.getString(2));System.out.println (rs.getString(3));}rs.close();pstmt.close();conn.close();} catch (Exception e){System.out.println("失败！");e.printStackTrace();}}public
static void main(String args[]){}}