我正在使用Firebug 1.5.4.当我引用一个未定义的变量或类似的变量时,它会在问题发生时向右突破,并将我抛入调试视图,在那里我可以看到堆栈并检查变量.
但是,当我抛出自己的异常时,它只需要我到控制台并打印出"未捕获的异常:等等".我希望它打破并让我检查变量.我如何告诉Firebug这样做?
是否可以在Grails中对addTo*函数进行单元测试?
谢谢你的帮助.
我正在实现一个Android应用程序,我无法弄清楚如何解决这个问题:当用户点击更新按钮,我想连接到我的服务器,并检查数据是否有任何更新,如果有,我想从服务器获取数据并更新数据库.我应该使用xml结构检查并从服务器获取更新,还是有更聪明的方法来实现这一点?
级别:初学者
def play_game(word_list):
hand = deal_hand(HAND_SIZE) # random init
while True:
cmd = raw_input('Enter n to deal a new hand, r to replay the last hand, or e to end game: ')
if cmd == 'n':
hand = deal_hand(HAND_SIZE)
play_hand(hand.copy(), word_list)
print
elif cmd == 'r':
play_hand(hand.copy(), word_list)
print
elif cmd == 'e':
break
else:
print "Invalid command."
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我的问题:什么是真的?
我认为"虽然真实"是简写但是为了什么?而变量'hand'被赋值?如果变量'hand'没有赋值?该怎么办?
我试图mysql2通过Bundler 安装gem,但它一直死于以下错误:
** executing command
/home/cc_rails/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rubygems/installer.rb:483:in 'rescue in block in build_extensions':
ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)
/home/cc_rails/.rvm/rubies/ruby-1.9.2-p0/bin/ruby extconf.rb --with-mysql-config=/usr/bin/mysql_config
checking for rb_thread_blocking_region()... yes
checking for mysql.h... no
checking for mysql/mysql.h... no
-----
mysql.h is missing. please check your installation of mysql and try again.
-----
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration …Run Code Online (Sandbox Code Playgroud) 假设我有一个这样的表:
表格1:
name favorite_music
a country
b rock
a jazz
b jazz
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如何进行此查询:找到favorite_music风格同时包含 "country" 和 "jazz"的名称.对于上面的例子,它应该只是"a".
如果使用GUI在MS SQL Management Studio中创建新触发器,它将为您提供以下模板:
--====================================
-- Create database trigger template
--====================================
USE <database_name, sysname, AdventureWorks>
GO
IF EXISTS(
SELECT *
FROM sys.triggers
WHERE name = N'<trigger_name, sysname, table_alter_drop_safety>'
AND parent_class_desc = N'DATABASE'
)
DROP TRIGGER <trigger_name, sysname, table_alter_drop_safety> ON DATABASE
GO
CREATE TRIGGER <trigger_name, sysname, table_alter_drop_safety> ON DATABASE
FOR <data_definition_statements, , DROP_TABLE, ALTER_TABLE>
AS
IF IS_MEMBER ('db_owner') = 0
BEGIN
PRINT 'You must ask your DBA to drop or alter tables!'
ROLLBACK TRANSACTION
END
GO
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我应该使用这个模板吗?
我对触发器一无所知,但我认为我需要使用它们.在这种情况下的目的是在表的插入,我需要更新其中一个字段.
请帮我一下!
我想按数量展示最畅销的产品
Product Table
ProductID ProductName
1 AA
2 BB
3 CC
[Order Details] Table
OrderID ProductID Quantity DateOfOrder
1 1 10 SomeDate
2 1 100 ,,
3 2 15 ,,
4 1 15 ,,
5 2 20 ,,
6 2 30 ,,
7 1 100 ,,
Expected Output
Product By Quantity AA
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因为总和(数量)= 225
我用了:
select 'Product By Quantity' + ProductName
from
Products
where ProductID in
(select
ProductID
from
[Order Details] det
where Quantity=
(
select max(SUM(Quantity))
from [Order Details] …Run Code Online (Sandbox Code Playgroud) 我正在尝试弄清楚如何在运行时以编程方式在Silverlight 4应用程序中应用主题.我认为这应该像从XAML加载资源字典并将其与应用程序的合并字典合并一样简单.到目前为止,这是我的代码:
var themeUri = new Uri(
"OurApp;component/Themes/Classic/Theme.xaml", UriKind.Relative);
var resourceInfo = GetResourceStream(themeUri);
using (var stream = resourceInfo.Stream)
{
using (var reader = new StreamReader(stream))
{
var xamlText = reader.ReadToEnd();
var dict = XamlReader.Load(xamlText) as ResourceDictionary;
Resources.MergedDictionaries.Add(dict);
}
}
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不幸的XamlParseException是,在致电期间提出了XamlReader.Load:
在'Bar'类型中找不到可附加属性'Foo'.
这种连接正确是正确声明,并在XAML命名空间声明正确引用所需的命名空间.如果通过App.xaml标记以声明方式加载到合并的字典中,附加属性XAML可以正常工作.
这是我正在尝试在运行时加载的XAML的缩写副本:
<ResourceDictionary xmlns:u="clr-namespace:Company.Product.Utils"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style x:Key="ControlPanelStyle" TargetType="ContentControl">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContentControl">
<Grid Margin="0" u:Bar.Foo="True">
<!-- Stuff and things -->
<ContentPresenter Content="{TemplateBinding Content}" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
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为什么在运行时加载XAML时附加属性的引用在"静态"加载时工作得很好?
silverlight xaml resourcedictionary attached-properties silverlight-4.0
让我们说在一个项目中有1.h,1.m,2.h和2.m如果我在2.m内有一个函数怎么能从1.m调用它
谢谢鲍勃
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