大约有 48,000 项符合查询结果（耗时：0.0566秒） [XML]
Why do people hate SQL cursors so much? [closed]
...arts of the RDBMS work under the hood. Often CREATE TABLE and INSERT have SELECT statements, and the implementation is the obvious internal cursor implementation.
Using higher-level "set-based operators" bundles the cursor results into a single result set, meaning less API back-and-forth.
Cursor...
Change a Git remote HEAD to point to something besides master
...inking about these specific services.
Now they have a drop-down menu for selecting the HEAD branch at http://repo.or.cz (example: http://repo.or.cz/editproj.cgi?name=for-me-and-for-all_imz.git);
and at http://gitorious.org, too (look somewhere in the settings);
and at http://GitHub.com: admin >...
Work on a remote project with Eclipse via SSH
...pective in Eclipse:
Define a new connection and choose SSH Only from the Select Remote System Type screen in the New Connection dialog.
Enter the connection information then choose Finish.
Connect to the new host. (Assumes SSH keys are already setup.)
Once connected, drill down into the host's Sft...
MySQL - length() vs char_length()
... in two bytes. Or UTF-8, where the number of bytes varies. For example:
select length(_utf8 '€'), char_length(_utf8 '€')
--> 3, 1
As you can see the Euro sign occupies 3 bytes (it's encoded as 0xE282AC in UTF-8) even though it's only one character.
...
How to add items to a spinner in Android?
...d:id="@+id/spinner"
android:layout_width="fill_parent"
android:drawSelectorOnTop="true"
android:prompt="@string/spin"
android:entries="@array/spinnerItems"
/>
Items definition in the file array.xml:
<resources>
<string-array name="spinnerItems">
<item...
How do I remove the “extended attributes” on a file in Mac OS X?
...
Answer (Individual Files)
1. Showcase keys to use in selection.
xattr ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
# com.apple.FinderInfo
# com.apple.lastuseddate#PS
# com.apple.metadata:kMDItemIsScreenCapture
# com.apple.metadata:kMDItemScreenCaptureGlobal...
How to Convert JSON object to Custom C# object?
...Runtime.Serialization by right clicking on the References in the solution, select the .NET tab and select System.Runtime.Serialization
– DanKodi
Sep 16 '13 at 15:08
1
...
Delete column from pandas DataFrame
...the original
data can be modified without creating a copy.
Popped
Column selection, addition, deletion
Delete column column-name:
df.pop('column-name')
Examples:
df = DataFrame.from_items([('A', [1, 2, 3]), ('B', [4, 5, 6]), ('C', [7,8, 9])], orient='index', columns=['one', 'two', 'three'])
...
How do you migrate an IIS 7 site to another server?
...ng the tool:
Right click your server or website in IIS Management Console, select 'Deploy', 'Export Application...' and run through the export.
On the new server, import the exported zip archive in the same way.
share
...
Spring DAO vs Spring ORM vs Spring JDBC
... can then write code like this:
int nbRows = jdbcTemplate.queryForObject("select count(1) from person", Integer.class);
Person p = jdbcTemplate.queryForObject("select first, last from person where id=?",
rs -> new Person(rs.getString(1), rs.getString(2)),
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