一、商品的修改：
在商品页面点击修改(这边要把pid传出来)
<td><a href="/Web13_1/EditProductServlet?pid=${ p.pid }">修改</a>|<a href="">删除</a></td>
1、通过PID查到该商品：
ProductDao:
/**
* 利用Id寻找对应的product
* @param id
* @return
* @throws SQLException
*/
public Product findById(String id) throws SQLException {
QueryRunner queryRunner = new QueryRunner(C3P0JDBCUtils.getDataSource());
String sql = "select * from product where pid = ?";
Product product = queryRunner.query(sql, new BeanHandler<Product>(Product.class), id);
return product;
}
ProductService:
/**
* 利用ID寻找对应的product
* @return
* @throws SQLException
*/
public Product findById(String id) throws SQLException {
ProductDao productDao = new ProductDao();
Product product = productDao.findById(id);
return product;
}
EditProductServlet:
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
String id = request.getParameter("pid");
ProductService productService = new ProductService();
Product product = productService.findById(id);
request.setAttribute("product", product);
request.getRequestDispatcher("/product/update.jsp").forward(request, response);
} catch (SQLException e) {
e.printStackTrace();
}
}
2、查到该商品后跳到update.jsp进行修改，再提交到UpdateProductServle把修改保存到数据库
update.jsp
<body>
<h1>商品修改</h1>
<form action="${ pageContext.request.contextPath}/UpdateProductServlet" method="post">
<input type="hidden" name="pid" value="${ product.pid }"/>
<table border="1px" width=500>
<tr>
<td>商品名称</td>
<td><input type="text" name="pname" value="${ product.pname }"></td>
</tr>
<tr>
<td>市场价格</td>
<td><input type="text" name="market_price" value="${ product.market_price }"></td>
</tr>
<tr>
<td>商城价格</td>
<td><input type="text" name="shop_price" value="${ product.shop_price }"></td>
</tr>
<tr>
<td>是否热门</td>
<td>
<input type="radio" name="is_hot" value="1" <c:if test="${ product.is_hot == 1 }">checked</c:if> >是
<input type="radio" name="is_hot" value="0" <c:if test="${ product.is_hot == 0 }">checked</c:if>>否
</td>
</tr>
<tr>
<td>是否下架</td>
<td>
<select name="pflag">
<option value="0" <c:if test="${ product.pflag == 0 }">selected</c:if> >否</option>
<option value="1" <c:if test="${ product.pflag ==1 }">selected</c:if> >是</option>
</select>
</td>
</tr>
<tr>
<td>商品描述</td>
<td><textarea rows="10" cols="10" name="pdesc" >${ product.pdesc }</textarea></td>
</tr>
<tr>
<td>商品分类</td>
<td>
<select name="cid" >
<option value="1" <c:if test="${ product.cid == 1 }">selected</c:if> >手机数码</option>
<option value="2" <c:if test="${ product.cid == 2 }">selected</c:if> >电脑办公</option>
<option value="3" <c:if test="${ product.cid == 3 }">selected</c:if> >汽车用品</option>
<option value="4" <c:if test="${ product.cid == 4 }">selected</c:if> >鞋靴箱包</option>
</select>
</td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="修改"></td>
</tr>
</table>
</form>
</body>
UpdateProductServlet：
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("UTF-8");
Map<String,String[]> map = request.getParameterMap();
Product product = new Product();
BeanUtils.populate(product, map);
product.setPdate(new Date());
ProductService productService = new ProductService();
productService.update(product);
request.getRequestDispatcher("/ProductFindAllServlet").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
}
}
UpdateProductServlet:
/**
* 修改数据
* @param product
* @throws SQLException
*/
public void update(Product product) throws SQLException {
ProductDao productDao = new ProductDao();
productDao.update(product);
}
ProductDao:
/**
* 修改数据
* @param product
* @throws SQLException
*/
public void update(Product product) throws SQLException {
QueryRunner queryRunner = new QueryRunner(C3P0JDBCUtils.getDataSource());
String sql = "update product set pname =?,market_price=?,shop_price=?,pimage=?,pdate=?,is_hot=?,pdesc=?,pflag=?,cid=? where pid=? ";
Object[] params = { product.getPname(), product.getMarket_price(), product.getShop_price(),
product.getPimage(), product.getPdate(), product.getIs_hot(), product.getPdesc(), product.getPflag(),
product.getCid(),product.getPid()};
queryRunner.update(sql, params);
}