大约有 47,000 项符合查询结果（耗时：0.0498秒） [XML]
How to read and write excel file
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145
Try the Apache POI HSSF. Here's an example on how to read an excel file:
try {
POIFSFileS...
Rails migrations: Undo default setting for a column
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edited Nov 7 '18 at 23:48
Joshua Pinter
34k1717 gold badges188188 silver badges208208 bronze badges
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Get parts of a NSURL in objective-c
...t:
@"%@://%@/%@",
url.scheme,
url.host,
url.pathComponents[1]];
For your example URL, what you seem to want is the protocol, the host and the first path component. (The element at index 0 in the array returned by -[NSString pathComponents] is simply "/", so you'll want the element ...
Postgres manually alter sequence
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The parentheses are misplaced:
SELECT setval('payments_id_seq', 21, true); # next value will be 22
Otherwise you're calling setval with a single argument, while it requires two or three.
share
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Any way to force strict mode in node?
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213
According to Lloyd you can now place
"use strict";
at the top of your file in node >= 0.1...
Unique constraint on multiple columns
...finition would be:
CREATE TABLE [dbo].[user](
[userID] [int] IDENTITY(1,1) NOT NULL,
[fcode] [int] NULL,
[scode] [int] NULL,
[dcode] [int] NULL,
[name] [nvarchar](50) NULL,
[address] [nvarchar](50) NULL,
CONSTRAINT [PK_user_1] PRIMARY KEY CLUSTERED
(
[userID...
cancelling queued performSelector:afterDelay calls
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241
[NSObject cancelPreviousPerformRequestsWithTarget:]
or
[NSObject cancelPreviousPerformReques...
Postgresql query between date ranges
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211
With dates (and times) many things become simpler if you use >= start AND < end.
For exa...
How to change the default font size in ggplot2
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118
Use theme_set()
theme_set(theme_gray(base_size = 18))
qplot(1:10, 1:10)
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What is a dependency property?
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edited Aug 18 '15 at 14:58
Matt
67.9k2020 gold badges137137 silver badges171171 bronze badges
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