大约有 40,000 项符合查询结果（耗时：0.0613秒） [XML]
TypeError: Missing 1 required positional argument: 'self'
...p.getPumps()
Small example -
>>> class TestClass:
def __init__(self):
print("in init")
def testFunc(self):
print("in Test Func")
>>> testInstance = TestClass()
in init
>>> testInstance.testFunc()
in Test Func
...
Shorten string without cutting words in JavaScript
...turn str;
– Silvain
Aug 23 '17 at 7:32
this doesn't handle the edge case where the separator doesn't occur in the stri...
Editing legend (text) labels in ggplot
...
@Sathish As you can see, the title of the y-axis is smaller than the title in the x-axis. The different sizes are used to illustrate the possibilities and its consequences. Thus the code used in the answer is correct imo.
– Jaap
Oct 14 '16 ...
How to add column if not exists on PostgreSQL?
...statement:
DO $$
BEGIN
BEGIN
ALTER TABLE <table_name> ADD COLUMN <column_name> <column_type>;
EXCEPTION
WHEN duplicate_column THEN RAISE NOTICE 'column <column_name> already exists in <table_name>.';
END;
END;
$$
...
How do I reset a sequence in Oracle?
...
alter sequence serial restart start with 1;
This feature was officially added in 18c but is unofficially available since 12.1.
It is arguably safe to use this undocumented feature in 12.1. Even though the syntax is not included in the official documentation, it is generated by the Oracle pa...
How to create composite primary key in SQL Server 2008
...name
– longhairedsi
Dec 6 '12 at 14:32
14
Not quite true. Both create "named constraints". It's j...
Oracle SQL: Update a table with data from another table
...
This is called a correlated update
UPDATE table1 t1
SET (name, desc) = (SELECT t2.name, t2.desc
FROM table2 t2
WHERE t1.id = t2.id)
WHERE EXISTS (
SELECT 1
FROM table2 t2...
How can I get the current language in Django?
...t: Returns None if translations are temporarily deactivated (by deactivate_all() or when None is passed to override()). Before Django 1.8, get_language() always returned LANGUAGE_CODE when translations were deactivated.
– Pieter
Jan 3 '17 at 13:11
...
How do I run msbuild from the command line using Windows SDK 7.1?
I'm setting up .NET 4.0 support on our CI server. I've installed .NET 4.0, and the .NET tools from the Windows 7.1 SDK.
7 A...
How to get all possible combinations of a list’s elements?
...ave a list with 15 numbers in, and I need to write some code that produces all 32,768 combinations of those numbers.
27 An...