constraints

问题 For an app (iOS 7 compatible) I need to have the possibility for totally different layouts in landscape and portrait mode. I see the only way in setting the constraints programmatically and change them on rotation. So I set my interface using IB and then set the constraints programmatically. I saw somewhere the approach to remove first all constraints, then create and add new constraints and then set the update flag for constraints on the parent view. I want the elements just to be full width

问题 I'm trying to use mysqldump to copy data from one server to another. The target server had a previous version of the same database installed, so all objects referenced already exist. I checked the output from mysqldump and it includes appropriate statements to (1) disable foreign key checks during the recreation and (2) drop the old tables. An edited excerpt looks like this: /*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */; ... DROP TABLE IF EXISTS `bins`; /*

问题 I understand that there are several options for kernel_constraint in Conv2D in Keras: max_norm, non_neg or unit_norm.. But what I needed is to set the anchor (center) position in the filter kernels to be zero. For example, if we have a filter kernel with its size of (width, height) = (5, 5), and that we have 3 channels in the input. I need to constrain the anchor (center) point of this kernel for every channel to be 0, like w(2,2,:)=0, assuming we put the channel dimension the 3rd dimension.

问题 I've a scenario where in I've to display four circles. These should be in center of screen. I tried to place x and top constraint but this doesn't works fine for iPhone 4 device. What constraints should I set so that all four circles should appear in center for all iPhone device? Further, there is UICollectionView in bottom. I tried to set the top, left, w and height but this didn't worked. Any solution? 回答1: 1) Embed your 4 circle in UIView. 2) Set UIView constraint top, fixed width,fixed

问题 To make application compatible with all sizes of devices, At some point we need to give width or height of UIControl in proportion with main view that is our self.view . So we used to assign constraint in storyboard, equal height/width to main view and then we set multiplier. Like 0.3 So it will set height of my control (iPhone 5s --> 568 ==> 568*0.3 = 170.4) and so on for all devices. But right now I am creating app in Xcode 11.0 . In that I cannot set equal height or width to main view. I

问题 I am very new to SQL and if my question is silly please forgive my ignorance. What is the difference between Primary Key only and Primary Key constraint? Difference between This CREATE TABLE CUSTOMERS( ID INT NOT NULL, PRIMARY KEY (ID, NAME) and This CREATE TABLE CUSTOMERS( ID INT NOT NULL, CONSTRAINT [Pk_ID_Name] PRIMARY KEY (ID, NAME) Thank you, Dash 回答1: In the second version, you can give a name to your constraint, allowing you to drop it using the name instead of having to name every

问题 A quick SQLAlchemy question... I have a class "Document" with attributes "Number" and "Date". I need to ensure that there's no duplicated number for the same year , is there a way to have a UniqueConstraint on "Number + year(Date)"? Should I use a unique Index instead? How would I declare the functional part? (SQLAlchemy 0.5.5, PostgreSQL 8.3.4) Thanks in advance! 回答1: You should use a functional unique index to apply this constraint. Unfortunately the database generic database independent

问题 A quick SQLAlchemy question... I have a class "Document" with attributes "Number" and "Date". I need to ensure that there's no duplicated number for the same year , is there a way to have a UniqueConstraint on "Number + year(Date)"? Should I use a unique Index instead? How would I declare the functional part? (SQLAlchemy 0.5.5, PostgreSQL 8.3.4) Thanks in advance! 回答1: You should use a functional unique index to apply this constraint. Unfortunately the database generic database independent

问题 I have one screen where I have added 1 scroll view on self view. Tab bar and navigation bar both are there and for iPhone 4 view height is 455.I have added more content on scroll view.the height of scroll view and self view is same.but when i am unable to set content size for scroll view.even i set too it is not working.Please help me. Thanks 回答1: Here is how to set up the size of the contentView in Auto Layout: Add a view to your scrollView. This should be the only top level view on your

问题 Let's say I have following model structure: @Entity @Table(....) public class AnnotationGroup{ ... private List<AnnotationOption> options; @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, orphanRemoval = true) @JoinColumn(name = "annotation_group_id", nullable = false) public List<AnnotationOption> getOptions() { return options; } } @Entity @Table(...) public class AnnotationOption { private Long id; @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Override public Long