大约有 44,500 项符合查询结果（耗时：0.0643秒） [XML]
Foreign Key to multiple tables
...yTypeName varchar(10)
)
insert into dbo.PartyType
values(1, 'User'), (2, 'Group');
create table dbo.Party
(
PartyId int identity(1,1) primary key,
PartyTypeId tinyint references dbo.PartyType(PartyTypeId),
unique (PartyId, PartyTypeId)
)
CREATE TABLE dbo.[Group]
(
ID int prim...
How to convert a JSON string to a Map with Jackson JSON
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325
[Update Sept 2020] Although my original answer here, from many years ago, seems to be helpful a...
How can I make space between two buttons in same div?
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12 Answers
12
Active
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Constructing pandas DataFrame from values in variables gives “ValueError: If using all scalar values
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621
The error message says that if you're passing scalar values, you have to pass an index. So you...
How do I change screen orientation in the Android emulator?
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26 Answers
26
Active
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Delete column from SQLite table
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206
From: http://www.sqlite.org/faq.html:
(11) How do I add or delete columns from an existing...
HashSet vs LinkedHashSet
...public LinkedHashSet(Collection<? extends E> c) {
super(Math.max(2*c.size(), 11), .75f, true); // <-- boolean dummy argument
addAll(c);
}
And (one example of) a HashSet constructor that takes a boolean argument is described, and looks like this:
/**
* Constructs a new, empty l...
How to parse/read a YAML file into a Python object? [duplicate]
... name: Node 1
branch1-1:
name: Node 1-1
branch2:
name: Node 2
branch2-1:
name: Node 2-1
And you've installed PyYAML like this:
pip install PyYAML
And the Python code looks like this:
import yaml
with open('tree.yaml') as f:
# use saf...
proper hibernate annotation for byte[]
....1 and JPA annotations. It has a few objects with byte[] attributes (1k - 200k in size). It uses the JPA @Lob annotation, and hibernate 3.1 can read these just fine on all major databases -- it seems to hide the JDBC Blob vendor peculiarities (as it should do).
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