做了一个插入学生信息的页面,用户填写完相应内容后,调用studentDaoImpl中的addStu方法向数据库写入对应数据
addStu方法
public int addStu(student stu) {
// TODO Auto-generated method stub
sql = "insert into student values(?,?,?,?,?,?)";//int string string int string double
try {
PreparedStatement ps = conn.prepareStatement(sql);
ps.setInt(1, stu.getId());
ps.setString(2, stu.getName());
ps.setDouble(3, stu.getScore());
ps.setString(4, stu.getSex());
ps.setInt(5, stu.getAge());
ps.setString(6, stu.getClassname());
num = ps.executeUpdate();
ps.close();
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return num;
}
**Servlet中取页面输入的数据(数据格式已经用js控制了)
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
int id = Integer.parseInt(request.getParameter("id"));
String name = request.getParameter("name");
double score = Double.parseDouble(request.getParameter("score"));
String sex = request.getParameter("sex");
int age = Integer.parseInt(request.getParameter("age"));
String classname = request.getParameter("classname");
/*添加进数据库前先判断此学生存在了没有
* :存在,返回页面并提示已存在
* :不存在,添加
* */
studentDaoImpl sdi = new studentDaoImpl();
if(sdi.findStuById(id)!=null){
//存在
request.setAttribute("exist", "<font color='red'>此学生已存在</font><br/>");
request.getRequestDispatcher("addStu.jsp").forward(request, response);
}
else{
//不存在
student stu = new student();
stu.setId(id);
stu.setName(name);
stu.setScore(score);
stu.setSex(sex);
stu.setAge(age);
stu.setClassname(classname);
sdi.addStu(stu);
request.setAttribute("exist", "添加成功");
request.getRequestDispatcher("addStu.jsp").forward(request, response);
}
}
这是js代码,用正则表达式控制input的各个数据格式
// JavaScript Document
function check(){
var id = document.getElementsByName('id')[0].value.replace(/(^\s*)|(\s*$)/g, "");
var score = document.getElementsByName('score')[0].value.replace(/(^\s*)|(\s*$)/g, "");
var age = document.getElementsByName('age')[0].value.replace(/(^\s*)|(\s*$)/g, "");
var classname = document.getElementsByName('classname')[0].value.replace(/(^\s*)|(\s*$)/g, "");
var errors = document.getElementsByName('error');
var flag = true;
/*每次点击时都先清空错误提示消息*/
for(var i=0; i<errors.length; i++){
errors[i].innerHTML = "";
}
if(/^[1-9]\d{0,1}/.test(id)==false){
errors[0].innerHTML = "学号输入有误,应为非0开头的1-2位数字";
flag = false;
}
if(/^\d+(\.\d+)?$/.test(score)==false){
errors[1].innerHTML = "分数格式有误,应为非负小数或整数";
flag = false;
}
if(/^[1-9]\d{0,2}$/.test(age)==false){
errors[2].innerHTML = "年龄格式有误,应为1-3位不为0开头的数字";
flag = false;
}
if(/^[1-9]{2}[\u4e00-\u9fa5]{2,3}[1-9]{1}[\u73ed]{1}$/.test(classname)==false){
errors[3].innerHTML = "班级名称格式有误,应为'2位数字+2字专业+1位数字+班'";
flag = false;
}
return flag;
}
在执行时报错Data truncated for column 'score' at row 1,网上搜大多是说格式没有对应上,可能java里的score是个字符串而数据库里的是double,我也特意检查了一下表格式,发现无误,这是创建表的语句
mysql> create table student(
-> id int(10) not null auto_increment,
-> name varchar(20) not null,
-> score double(5,2) not null,
-> sex varchar(2) not null,
-> age int(3) not null,
-> classname varchar(20) not null,
-> primary key(id)
-> )ENGINE=InnoDB, DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.01 sec)
不太会排版,有点凌乱了,实在抱歉