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问题 I want to set date as default value for date in mysql (not timestamp), but the following error appear ALTER TABLE `RMS`.`transactionentry` CHANGE `Date` `Date` DATE DEFAULT NOW() NOT NULL Error Invalid default value for 'Date' Same Case alter table `RMS`.`transactionentry` change `Date` `Date` date default 'CURRENT_DATE' NOT NULL 回答1: alter table `RMS`.`transactionentry` change `Date` `Date` date default current_timestamp NOT NULL Updated: I don't think you can achieve that with mysql date .

问题 I want to set date as default value for date in mysql (not timestamp), but the following error appear ALTER TABLE `RMS`.`transactionentry` CHANGE `Date` `Date` DATE DEFAULT NOW() NOT NULL Error Invalid default value for 'Date' Same Case alter table `RMS`.`transactionentry` change `Date` `Date` date default 'CURRENT_DATE' NOT NULL 回答1: alter table `RMS`.`transactionentry` change `Date` `Date` date default current_timestamp NOT NULL Updated: I don't think you can achieve that with mysql date .

问题 Currently I have JSON that either comes in via an HTTP call or is stored in a database but during server processing they are mapped to C# objects. These objects have properties like public List<int> MyArray . When the JSON contains MyArray:null I want the resulting property to be an empty List<T> instead of a null List<T> property. The goal is that the object will "reserialize" to JSON as MyArray:[] , thus either saving to the database or responding out via HTTP as an empty array instead of

问题 I set the color to red , and after that I want to set the color again back to default, but I do not know what is default color, does anyone knows ? 回答1: You can save old color and then use it to restore the original value. Here is an example: ColorStateList oldColors = textView.getTextColors(); //save original colors textView.setTextColor(Color.RED); .... textView.setTextColor(oldColors);//restore original colors But in general default TextView text color is determined from current Theme

问题 I have an XElement, resulting from a transform that looks like the following. <src:Person xmlns:src="http://www.palantir.za"> <src:Name>Jenifer Harvey</src:Name> <src:BirthDate>1969-11-13</src:BirthDate> <src:IdentityNumber>6906678550017</src:IdentityNumber> <src:Sex>Male</src:Sex> </src:Person> I would like to transform this XElement into a new XElement that has 'src' as a default namespace rather than a 'named' namespace as above. I realise they are probably semantically identical, I just

问题 How can I make a Python script to be a specific file type's (e.g., *.foo) default application? As in, when I double click the file in the Finder / Explorer I want the file to open in the Python script. Is this possible to do in Win and/or OS X? The application is a PySide app if that matters. 回答1: Mac OS X On Mac OS X you can use Automator to create an application that calls your python app and passes the input file path as a string argument. In the application workflow wizard, add action

问题 Whenever I create a new Web Form on Visual Studio 2010, the default name is always "Default.aspx". This is a slight pain as I'm having to change it to "Index.aspx" each time. How can I change this so that "Index.aspx" is the default name? Thanks. 回答1: You can by modifying the associated .vstemplate DefaultName element. For example, you might find the webform template you need to modify in a directory similar to the following: C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE

问题 In .net, I have an inherited control: public CustomComboBox : ComboBox I simply want to change the default value of DropDownStyle property, to another value (ComboBoxStyle.DropDownList) besides the default one specified in the base class (ComboBoxStyle.DropDown). One might think that you can just add the constructor: public CustomComboBox() { this.DropDownStyle = ComboBoxStyle.DropDownList; } However, this approach will confuse the Visual Studio Designer. When designing the custom Control in

问题 How to set default value for a field to other column in Mysql I have done it oracle with virtual field but I do not know how to do it in Mysql this is my table: create table TSM_TRANSACTION_TBL ( TRANS_ID INT primary key auto_increment, LOCATION_ID INT, TRANS_DATE DATE, RESOURCE_ID INT, TS_ID INT, MAX_VALUE INT, BOOKED_UNITS INT default 0, REMAINING INT default MAX_VALUE - BOOKED_UNITS, BOOKED INT not null, USER_ID INT, TRANS_TIME TIMESTAMP ) 回答1: As documented under Data Type Default Values:

问题 Whenever I add a new class to a Visual Studio (C#) project, I get the following usings automatically: using System; using System.Collections.Generic; using System.Linq; using System.Text; Additionally, the following DLL references are added if they weren't there already: System.Core System.Data System.Xml I'd like to prevent VS from doing this (except "using System" of course). Does any one know of a way to prevent this from happening? 回答1: Marc and Brian both have a good idea: create a new