我的代码在下面根据用户输入查询数据库中的一组行.我已经尝试并测试了SQL Developer中的查询,它可以很好地返回正确的行.输入的示例是:2013-01-22
但由于某种原因在java内部我收到此错误:
java.sql.SQLException: Invalid column index
控制台指示它在此处开火:
preparedStatement.setString(1, to);
完整的连接代码:
ResultSet rs = null;
PreparedStatement preparedStatement = null;
try {
String strQuery =
"SELECT homes.home_id, homes.title, homes.description, homes.living_room_count, homes.bedroom_count, homes.bathroom_count, homes.price, homes.sqft,"
+ " listagg(features.feature_name, '\n') WITHIN GROUP(ORDER BY features.feature_name) features, home_type.type_name"
+ " FROM homes"
+ " INNER JOIN bookings ON bookings.home_id <> homes.home_id"
+ " INNER JOIN home_feature ON homes.home_id = home_feature.home_id"
+ " INNER JOIN home_type ON home_type.type_code = homes.type_code"
+ " INNER JOIN features ON …嘿，谁能帮我将下面的 5 个表合并到一个查询中？我目前有下面的查询，但似乎不起作用，就好像在招聘表中有两个具有相同 ID 的产品一样，所有产品都是从产品表中返回的，这显然是错误的。
SELECT products.prod_id, products.title, products.price, product_types.name,
listagg(suppliers.name, ',') WITHIN GROUP(ORDER BY suppliers.name) suppliers
FROM products
INNER JOIN product_suppliers ON products.prod_id = product_suppluer.prod_id
INNER JOIN product_types ON product_types.type_id = products.type_id
INNER JOIN suppliers ON product_suppliers.supp_id = suppliers.supp_id
LEFT OUTER JOIN hires ON hires.prod_id = products.prod_id
WHERE (hires.hire_end < to_date('21-JAN-13') OR hires.hire_start > to_date('26-JAN-13'))
OR hires.prod_id IS NULL
GROUP BY products.prod_id, products.title, products.price, product_types.name
表数据：
PRODUCTS
--------------------------------------------
| Prod_ID | Title | Price | Type_ID |
|------------------------------------------|
| …我有一个简单的注册表单,使用jQuery验证来验证表单的内容.但它似乎没有工作.无论我的页面顶部是否有jQuery,我的servlet都会触发,并且表单会以无效数据提交.以下是我的代码.有人可以帮忙吗？
脚本代码:
<head>
<title>Sign Up</title>
<meta charset="iso-8859-1">
<link rel="stylesheet" href="style/style.css" type="text/css">
<!--[if lt IE 9]><script src="scripts/html5shiv.js"></script><![endif]-->
<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.10.0/jquery.validate.js" type="text/javascript">
</script>
<script src="http://code.jquery.com/jquery-1.8.3.min.js" type="text/javascript">
</script>
<script type="text/javascript">
$().ready(function() {
// validate the comment form when it is submitted
$("#signup").validate();
// validate signup form on keyup and submit
$("#signup").validate({
rules: {
firstname: "required",
lastname: "required",
address1: "required",
city: "required",
county: "required",
postcode: "required",
password_s: {
required: true,
minlength: 5
},
password_s_con: {
required: true,
minlength: 5,
equalTo: "#password_s"
},
email: {
required: …我下面的SQL查询说它在第一次内部连接上没有正确结束？如果我删除了第二个表和where子句,查询就可以了吗？
SELECT homes.home_id, homes.title, homes.description, homes.living_room_count, homes.bedroom_count, homes.bathroom_count, homes.price, homes.sqft,
listagg(features.feature_name, '\n') WITHIN GROUP(ORDER BY features.feature_name) features, home_type.type_name
FROM homes, bookings
WHERE bookings.booking_end < date '2013-01-23' OR bookings.booking_start > date '2013-01-22' AND bookings.home_id <> homes.home_id
INNER JOIN home_feature ON homes.home_id = home_feature.home_id
INNER JOIN home_type ON home_type.type_code = homes.type_code
INNER JOIN features ON home_feature.feature_id = features.feature_id
GROUP BY homes.home_id, homes.title, homes.description, homes.living_room_count, homes.bedroom_count, homes.bathroom_count, homes.price, homes.sqft, home_type.type_name
任何人都可以看到我的查询有任何明显错误吗？
嗨,我有一个servlet,它在提交按钮上从jsp获取参数.其中一个参数是报告为null.然而,这种情况并非如此.有问题的文本输入由会话变量自动填充,绝对不为空,可以在页面的文本框中看到.但是当在servlet内部时,java控制台指示该变量为null？下面是填充框并读取参数的代码.
<input type="text" id="cID" value="<%= session.getAttribute("cID")%>" readonly="readonly">
阅读参数:
String cID = request.getParameter("cID");
在netbeans中将cID打印到控制台时,据说它为空？