当我尝试在mysql中创建表时出现错误.
解决它的任何提示?
create table stock_in(
ind int not null auto_increment,
itemcode varchar(10) not null,
quantity int not null,
description text not null,
sales_ref int not null default -1,
return_outwards_ref int not null default -1,
stock_in_receipt_ref int not null default -1,
date text not null,
time text not null,
username text not null,
foreign key (sales_ref) references sales (receiptno),
foreign key (return_outwards_ref) references returnoutwards(ind),
primary key (ind)
);
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错误:
ERROR 1005 (HY000): Can't create table 'posinventory.stock_in' (errno: 150)
Run Code Online (Sandbox Code Playgroud) 我在处理取消选中所有复选框时遇到问题.当我点击一个切换所有复选框时,它可以检查所有复选框.但如果我取消选中切换所有复选框,则不会发生任何事情.不会取消选中所有复选框.以下是我在javascript中的编码:
<script>
var isAllCheck = false;
function togglecheckboxes(cn){
var cbarray = document.getElementsByName(cn);
for(var i = 0; i < cbarray.length; i++){
if( isAllCheck == false ){
cbarray[i].checked = "true";
//alert( "it is false" );
}else{
cbarray[i].removeAttribute("checked");
//alert( "it is true" );
}
}
isAllCheck = !isAllCheck;
}
</script>
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我甚至尝试过这种编码,但仍然失败了:
<script>
var isAllCheck = false;
function togglecheckboxes(cn){
var cbarray = document.getElementsByName(cn);
for(var i = 0; i < cbarray.length; i++){
if( isAllCheck == false ){
cbarray[i].checked = "true";
//alert( "it is false" ); …
Run Code Online (Sandbox Code Playgroud) 这是我第一次遇到这个错误.此代码基本上获取特定日期内销售的每件商品的总和.
有关解决此问题的任何提示吗?谢谢.
Run Code Online (Sandbox Code Playgroud)Statement statement = connection.createStatement(); String query = "SELECT itemcode, SUM(quantity) AS 'Total Sales Per Day' " + "FROM sales " + "WHERE real_pur_date = '" + date + "' " + "GROUP BY itemcode "; ResultSet rs = statement.executeQuery( query ); // this line gets the error / exception while( rs.next() ){ Vector row = new Vector(); row.add( rs.getString( "itemcode" ) ); row.add( rs.getInt( "Total Sales Per Day" ) ); dailyData.add( row ); } statement.close();
Exception in thread …
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$welcomeMessage;
if( isset( $_SESSION['username'] ) ){
$username = $_SESSION['username'];
$welcomeMessage = "Hello $username! | ";
$welcomeMessage .= '<a href="'.$_SERVER['DOCUMENT_ROOT'].'/nmc/Admin/LogoutProcessor.php">Logout</a>';
} else {
$welcomeMessage = "Welcome | ";
$welcomeMessage .= '<a href="'.$_SERVER['DOCUMENT_ROOT'].'/nmc/Admin/LoginPage.php">Login</a>';
}
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上面的代码返回"file:/// C:/xampp/htdocs/nmc/Admin/LoginPage.php"
我正在使用xampp开发一个网站,基本上使用自己的服务器处理,因此我无法使用上面的链接.我在不同目录中有几个网页必须链接到LoginPage.php,我需要一个标准链接.上面的代码位于一个类中,其中不同目录中的其他页面可以调用它.
谁能告诉我如何解决这个问题?
谢谢!
我已经尝试了一些关于将新子项添加到XML文件的代码.我注意到使用XmlDocument.Load(String filename)和XmlDocument.Load(FileStream fs)时结果不同.下面显示了原始XML文件数据.
<?xml version="1.0" encoding="utf-8"?>
<grandparent>
<parent>
<child>
<grandchild>some text here</grandchild>
</child>
<child>
<grandchild>another text here</grandchild>
</child>
</parent>
</grandparent>
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下面显示了使用XmlDocument.Load(String filename)附加子元素的C#代码
XmlDocument doc = new XmlDocument();
doc.Load(filename);
XmlNode child= doc.CreateNode(XmlNodeType.Element, "child", null);
XmlNode grandchild = doc.CreateNode(XmlNodeType.Element, "grandchild", null);
grandchild.InnerText = "different text here";
child.AppendChild(grandchild);
doc.SelectSingleNode("//grandparent/parent").AppendChild(child);
doc.Save(filename);
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结果XML文件正常工作,如下所示.
<?xml version="1.0" encoding="utf-8"?>
<grandparent>
<parent>
<child>
<grandchild>some text here</grandchild>
</child>
<child>
<grandchild>another text here</grandchild>
</child>
<child>
<grandchild>different text here</grandchild>
</child>
</parent>
</grandparent>
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但是,如果我使用XmlDocument.Load(FileStream fs),如下所示
FileStream fs = new FileStream(filename, FileMode.Open)
XmlDocument doc …
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