field

问题 Informix iSQL has a command " info tables; " that shows all tables. The syntax for viewing the fields and their respective data types is " info columns for table; " Is there a similar command that shows table.field for all tables and all fields? 回答1: Using the preferred JOIN notation: SELECT TRIM(t.tabname) || '.' || TRIM(c.colname) AS table_dot_column FROM "informix".systables AS t JOIN "informix".syscolumns AS c ON t.tabid = c.tabid WHERE t.tabtype = 'T' AND t.tabid >= 100 ORDER BY t

问题 I'm trying to plot a simple quiver plot (e.g. as in the matplotlib gallery: http://matplotlib.org/examples/pylab_examples/quiver_demo.html), although I don't want the autoscaling feature enabled. I only want to show the field direction, not the magnitude. Is there a way to set the arrow size as constant please? I tried playing with the scale and scale units but this just seems to change all arrows by some common factor. Thanks 回答1: Changing scale won't work for this. You need to normalize the

问题 I see a lot of example code for C# classes that does this: public class Point { public int x { get; set; } public int y { get; set; } } Or, in older code, the same with an explicit private backing value and without the new auto-implemented properties: public class Point { private int _x; private int _y; public int x { get { return _x; } set { _x = value; } } public int y { get { return _y; } set { _y = value; } } } My question is why. Is there any functional difference between doing the above

问题 How can I add a new field to every document in an existent collection? I know how to update an existing document's field but not how to add a new field to every document in a collection. How can I do this in the mongo shell? 回答1: Same as the updating existing collection field, $set will add a new fields if the specified field does not exist. Check out this example: > db.foo.find() > db.foo.insert({"test":"a"}) > db.foo.find() { "_id" : ObjectId("4e93037bbf6f1dd3a0a9541a"), "test" : "a" } >

问题 How can I add a new field to every document in an existent collection? I know how to update an existing document's field but not how to add a new field to every document in a collection. How can I do this in the mongo shell? 回答1: Same as the updating existing collection field, $set will add a new fields if the specified field does not exist. Check out this example: > db.foo.find() > db.foo.insert({"test":"a"}) > db.foo.find() { "_id" : ObjectId("4e93037bbf6f1dd3a0a9541a"), "test" : "a" } >

问题 I have a class like below public class SampleReflection { public static final String TWO_name = "html"; public static final String TWO_find = "css"; public static final String ONE_KEY_java = "java"; public static final String ONE_KEY_jsp = "jsp"; public static final String ONE_KEY_oracle = "oracle"; public static final String ONE_KEY_spring = "spring"; public static final String ONE_KEY_struts = "struts"; } I would like to get all the fields which starts with ONE_KEY and their value. because

问题 I added background: transparent; to the form field, however that also includes the image I'm trying to attach. When I use just the image, all I see is the regular form field. The field itself is like a sketchy underline, so that's why I need the image versus CSS styling. Can anyone please help? Thank you! *Update! I couldn't get my images to show up because I hadn't set the height / width on the field itself. But the underline is showing up. The image itself is a transparent png, but the

问题 I added background: transparent; to the form field, however that also includes the image I'm trying to attach. When I use just the image, all I see is the regular form field. The field itself is like a sketchy underline, so that's why I need the image versus CSS styling. Can anyone please help? Thank you! *Update! I couldn't get my images to show up because I hadn't set the height / width on the field itself. But the underline is showing up. The image itself is a transparent png, but the

问题 I understand things in here are value types and not referenced so the field _num won't be modified when I just update the list. But my question is how to update the field _num when I modify the list that contains it gets modified? class Foo { public List<object> mylist; private int _num; public int num { get { return _num; } set { this._num = value; mylist[0] = value; } } public Foo() { mylist = new List<object>(); mylist.Add(_num); } } class Program { static void Main(string[] args) { Foo my

问题 this work <input type="text" aaa="{{field.isRequired | requiredx}}" ng-model="field.input.model"> output <input type="text" aaa="required" class="form-control ng-pristine ng-valid" ng-model="field.input.model"> but this not work <input type="text" required="{{field.isRequired | requiredx}}" ng-model="field.input.model"> output <input type="text" required="{{field.isRequired | requiredx}}" class="form-control ng-pristine ng-valid ng-valid-required" ng-model="field.input.model"> .... Edit, add