大约有 40,000 项符合查询结果（耗时：0.0389秒） [XML]
What's the difference between Spring Data's MongoTemplate and MongoRepository?
...can do complex queries using spring-data and mongodb. I have been starting by using the MongoRepository but struggled with complex queries to find examples or to actually understand the Syntax.
...
How to get the unique ID of an object which overrides hashCode()?
... So if an object is created at memory address 0x2000, then is moved by the VM, then an other object is created at 0x2000, will they have the same System.identityHashCode()?
– Limited Atonement
Jun 7 '13 at 22:54
...
Pandas percentage of total with groupby
...
Paul H's answer is right that you will have to make a second groupby object, but you can calculate the percentage in a simpler way -- just groupby the state_office and divide the sales column by its sum. Copying the beginning of Paul H's answer:
# From Paul H
import numpy as np
import pand...
Best way of invoking getter by reflection
...n is part of the well-established JavaBeans specification and is supported by the classes in the java.beans package.
share
|
improve this answer
|
follow
|
...
How to prevent custom views from losing state across screen orientation changes
...
You do this by implementing View#onSaveInstanceState and View#onRestoreInstanceState and extending the View.BaseSavedState class.
public class CustomView extends View {
private int stateToSave;
...
@Override
public Parcelable...
Same Navigation Drawer in different Activities
...ty with exactly the same id.
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerToggle = new ActionBarDrawerToggle((Activity) this, drawerLayout, R.drawable.ic_drawer, 0, 0)
{
public void onDrawerClosed(View view)
{
...
Throw an error in a MySQL trigger
...
Unfortunately, the answer provided by @RuiDC does not work in MySQL versions prior to 5.5 because there is no implementation of SIGNAL for stored procedures.
The solution I've found is to simulate a signal throwing a table_name doesn't exist error, pushing a ...
Count with IF condition in MySQL query
...s`.`category` = 'news_layer2'
AND `ccc_news`.`status` = 'Active'
GROUP BY
ccc_news.news_id
ORDER BY
ccc_news.set_order ASC
LIMIT 20
share
|
improve this answer
|
...
Can I return the 'id' field after a LINQ insert?
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...
What is “the inverse side of the association” in a bidirectional JPA OneToMany/ManyToOne association
...it where in the order table it can save this data (which happens via mappedBy).
Another common example are trees with nodes which can be both parents and children. In this case, the two fields are used in one class:
public class Node {
// Again, this is managed by Hibernate.
// There is no...