<% request.setCharacterEncoding("utf-8"); String id=request.getParameter("id"); Class.forName("com.mysql.jdbc.Driver"); Connection conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/library","root","123456"); Statement stat=conn.createStatement(); String sql="update books set count=count-1 where id="+id; stat.executeUpdate(sql); stat.close(); conn.close(); response.sendRedirect("borrow.jsp"); %>在上述代码中使用批处理技术同时实现 //String sql=insert into borrow(id,dname,btime) values('"+id+"','"+dname+"','"+btime+"');语句

可以使用PreparedStatement来实现批处理技术同时实现以上两个语句，示例代码如下：

request.setCharacterEncoding("utf-8");
String id = request.getParameter("id");
String dname = "xxx"; // 假设dname和btime是已知的值
String btime = "xxx";
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/library", "root", "123456");
conn.setAutoCommit(false); // 关闭自动提交事务
String sql1 = "update books set count=count-1 where id=?";
String sql2 = "insert into borrow(id,dname,btime) values(?,?,?)";
PreparedStatement ps1 = conn.prepareStatement(sql1);
PreparedStatement ps2 = conn.prepareStatement(sql2);
ps1.setString(1, id);
ps2.setString(1, id);
ps2.setString(2, dname);
ps2.setString(3, btime);
ps1.addBatch(); // 添加到批处理中
ps2.addBatch();
ps1.executeBatch(); // 执行批处理
ps2.executeBatch();
conn.commit(); // 提交事务
ps1.close();
ps2.close();
conn.close();
response.sendRedirect("borrow.jsp");

其中，conn.setAutoCommit(false)关闭自动提交事务，需要手动提交事务。ps1.addBatch()和ps2.addBatch()添加到批处理中，ps1.executeBatch()和ps2.executeBatch()执行批处理，conn.commit()提交事务。这样可以将多个SQL语句打包在一起，减少了与数据库的交互次数，提高了效率。