大约有 40,000 项符合查询结果（耗时：0.0399秒） [XML]
How do I rename a column in a database table using SQL?
...any other RDBMS), you can do it with regular ALTER TABLE statement:
=> SELECT * FROM Test1;
id | foo | bar
----+-----+-----
2 | 1 | 2
=> ALTER TABLE Test1 RENAME COLUMN foo TO baz;
ALTER TABLE
=> SELECT * FROM Test1;
id | baz | bar
----+-----+-----
2 | 1 | 2
...
Is it true that one should not use NSLog() on production code?
...ions to control the defining (or lack of defining) the DEBUG_MODE.
If you select "Debug" active configuration, DEBUG_MODE will be defined, and the macro expands to the full NSLog definition.
Selecting the "Release" active configuration will not define DEBUG_MODE and your NSLogging is omitted from ...
How do you fork your own repository on GitHub?
...our repo's main page on github.
Click the + icon in the top right corner.
Select "Import repository".
Where it asks for the "Old URL", paste the URL you copied at step #1
Enter the name of your new repo and click Begin Import.
That's it! You now have a copy of the full repo, with all commit histor...
“An attempt was made to load a program with an incorrect format” even when the platforms are the sam
...this was the answer... Can anyone suggest a downside to having this option selected?
– notidaho
Jul 31 '12 at 14:10
3
...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
... 总共32个vcpu。 16个table，每个5M row。
OLTP_RO测试包含5个select查询：select_ranges, select_order_ranges, select_distinct_ranges, select_sum_ranges,
可以看到在多核心或者多线程的场景下， jemalloc和tcmalloc带来的tps增加非常明显。
参考资料
glibc...
How do you perform a left outer join using linq extension methods
...=> bar.Foo_Id,
(x,y) => new { Foo = x, Bars = y })
.SelectMany(
x => x.Bars.DefaultIfEmpty(),
(x,y) => new { Foo=x.Foo, Bar=y});
share
|
improve t...
How can I write a regex which matches non greedy? [duplicate]
...
The non-greedy ? works perfectly fine. It's just that you need to select dot matches all option in the regex engines (regexpal, the engine you used, also has this option) you are testing with. This is because, regex engines generally don't match line breaks when you use .. You need to tell ...
Android Studio Gradle Configuration with name 'default' not found
...:
Go to your sub-project-module/library-module settings. (press F4 after selecting the module)
Right Click on Add > Android-Gradle.
Add build.gradle to your module.
Add the following script
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.android.tools.bu...
android pick images from gallery
....ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE);
Don't forget also to create the constant PICK_IMAGE, so you can recognize when the user comes back from the image gallery Activity:
public static final int PICK_IMAGE = 1;
@Override
public v...
Sublime 3 - Set Key map for function Goto Definition
..."count": 1,
"modifiers": ["ctrl"],
"press_command": "drag_select",
"command": "goto_definition"
}
]
You can change modifiers key as you like.
Since Ctrl-button1 on Windows and Linux is used for multiple selections, adding a second modifier key like Alt might be a go...