大约有 48,000 项符合查询结果（耗时：0.0683秒） [XML]
find vs find_by vs where
...irb(main):037:0> @kit = Kit.find_by(number: "3456")
Kit Load (0.9ms) SELECT "kits".* FROM "kits" WHERE "kits"."number" =
'3456' LIMIT 1
=> #<Kit id: 1, number: "3456", created_at: "2015-05-12 06:10:56",
updated_at: "2015-05-12 06:10:56", job_id: nil>
irb(main):038:0> @kit.upd...
How can one see the structure of a table in SQLite? [duplicate]
...
You can query sqlite_master
SELECT sql FROM sqlite_master WHERE name='foo';
which will return a create table SQL statement, for example:
$ sqlite3 mydb.sqlite
sqlite> create table foo (id int primary key, name varchar(10));
sqlite> select sql f...
Eclipse: Can you format code on save?
...ces, choose Java --> Editor --> Save Actions. Check the Perform the selected actions on save, and check the Format source code box.
This may or may not be available in previous versions of Eclipse. I know it works in:
Version: 3.3.3.r33x_r20080129-_19UEl7Ezk_gXF1kouft<br>
Build id: M...
What is the size of column of int(11) in mysql in bytes?
...ytes (64 bit).
The length just specifies how many characters to pad when selecting data with the mysql command line client. 12345 stored as int(3) will still show as 12345, but if it was stored as int(10) it would still display as 12345, but you would have the option to pad the first five digits. ...
set gvim font in .vimrc file
...tart a graphical vim session.
Do :e $MYGVIMRC Enter
Use the graphical font selection dialog to select a font.
Type :set guifont= Tab Enter.
Type G o to start a new line at the end of the file.
Type Ctrl+R followed by :.
The command in step 6 will insert the contents of the : special register
whic...
How to ALTER multiple columns at once in SQL Server
...same character in multiple fields (such as removing \t from all columns).
SELECT
TABLE_CATALOG
,TABLE_SCHEMA
,TABLE_NAME
,COLUMN_NAME
,'ALTER TABLE ['+TABLE_SCHEMA+'].['+TABLE_NAME+'] ALTER COLUMN ['+COLUMN_NAME+'] VARCHAR(300)' as 'code'
FROM INFORMATION_SCHEMA.COLUMNS
WHERE T...
GROUP_CONCAT ORDER BY
...
You can use ORDER BY inside the GROUP_CONCAT function in this way:
SELECT li.client_id, group_concat(li.percentage ORDER BY li.views ASC) AS views,
group_concat(li.percentage ORDER BY li.percentage ASC)
FROM li GROUP BY client_id
...
Find UNC path of a network drive?
...le from Windows Explorer into the body of a Word document or Outlook email
Select 'Create Hyperlink Here'
The inserted text will be the full UNC of the dragged item.
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How to apply two CSS classes to a single element
...To target elements that contain all of the specified classes, use this CSS selector (no space) (ref):
.c1.c2 {
}
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Convert a CERT/PEM certificate to a PFX certificate
... tools:
Import certificate to the certificate store. In Windows Explorer select "Install Certificate" in context menu.
Follow the wizard and accept default options "Local User" and "Automatically".
Find your certificate in certificate store. On Windows 10 run the "Manage User Certificates" MMC. ...