MyEclipse------execute()使用方法

execute()方法应该仅在语句能返回多个ResultSet对象，多个更新计数或ResultSet对象与更新计数的组合时使用。
testExecute.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://"
            + request.getServerName() + ":" + request.getServerPort()
            + path + "/";
%>
<%@page import="java.sql.*" %>
<%request.setCharacterEncoding("UTF-8"); %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>无敌超官网-你值得拥有</title>
<style type="text/css">
    a:hover{color:red;}
</style>
</head>

<body>
    SQL语句<br>
    <%
        String sql=request.getParameter("content");//获取文本区的内容
        if(sql==null){
    %>
        <form action="mysql/testExecute.jsp" method="post">
        <p><input type="text" name="content" size="40" required maxlength="40"/></p>
        <p><input type="submit" value="提交">
    </form>
    <%
        }
        else{
            String url="jdbc:mysql://localhost:3306/student?useSSL=true";
            String useName="root";
            String password="2277092";
            Connection conn=null;
            Statement stmt=null;//向数据库发送SQL语句,其对象用conn.createStatement()创建，
                                //返回的结果存放在ResultSet对象中
            
            try{
                Class.forName("com.mysql.jdbc.Driver");
                out.print("加载驱动类成功<br>");
            }
            catch(Exception e){
                out.print("加载驱动类出现异常");
            }
            
            try{
                conn=DriverManager.getConnection(url,useName,password);
                stmt=conn.createStatement();
                
                out.print("执行的SQL语句为:"+sql);
                
                //execute()用法
                //使用execute()执行未知的语句,如果sql是正确的语句，则返回true，否则返回false
                boolean isResultSet=stmt.execute(sql);
                int count=0;
                while(true){
                    count++;
                    if(isResultSet){
                        ResultSet rs=stmt.getResultSet();
                        out.print("返回的执行结果 "+count+" 为结果集<br>");
                        //显示返回的结果集
                        while(rs.next()){
                            //注意MySQL里面INT(10),如果数字很长，就用long
                            Long no=rs.getLong(1);
                            String name=rs.getString(2);
                            String phone=rs.getString(3);
                            out.print(no+" "+name+" "+phone+"<br>");
                        }
                        rs.close();
                    }
                    else{
                        int affectdRowCount=stmt.getUpdateCount();
                        if(affectdRowCount==-1)break;
                        out.print("返回的执行结果 "+count+" 为更新计数<br>");
                        out.print("<br>");
                    }
                    //使用execute()方法时需要调用getMoreResus()方法
                    isResultSet=stmt.getMoreResults();
                }
                stmt.close();    
            }
            catch(Exception e){
                out.print("出现SQLExcepion异常");
            }
            finally{
                try{
                    if(conn!=null){
                        conn.close();
                        out.print("<br><a href='mysql/testExecute.jsp'>重新输入SQL语句</a>");
                    }
                }
                catch(Exception e){
                    out.print("关闭数据库连接时出现异常");
                }
                
            }    
        }
     %>
</body>
</html>