大约有 7,000 项符合查询结果（耗时：0.0276秒） [XML]
Fastest check if row exists in PostgreSQL
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How about simply:
select 1 from tbl where userid = 123 limit 1;
where 123 is the userid of the batch that you're about to insert.
The above query will return either an empty set or a single row, depending on whether there are records with the given userid.
If this turns o...
How do I run Asynchronous callbacks in Playground
...swered Nov 25 '16 at 10:58
bradd123bradd123
9111 silver badge22 bronze badges
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Insert all values of a table into another table in SQL
...dited Feb 26 '14 at 1:12
hichris123
9,5151212 gold badges5050 silver badges6666 bronze badges
answered Apr 21 '10 at 9:35
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If statement in aspx page
...erver">
<% If Request.QueryString("id_query_param") = 123 Then 'Add some VB comment here,
'which will not be visible in the rendered source code of the aspx page later %>
<!-- add some html content depending on -->
<!-- the conditi...
Linux Glibc幽灵漏洞允许黑客远程获取系统权 - 操作系统(内核) - 清泛网 - ...
...，几乎其它任何运行库都会依赖于glibc。glibc除了封装Linux操作系统所提供的系统服务外，它本身也提供了许多其它一些必要功能服务的实现。
什么是glibc
glibc是GNU发布的libc库，即c运行库。glibc是linux系统中最底层的api，几乎...
How do I fetch a single model in Backbone?
...ers with the hashbang in your URL like so, http://www.mydomain.com/#clocks/123 , but it should work even if you haven't yet.
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boost::filesystem指南 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ystem的原因就在于此，这个特殊性表现在：
文件系统是操作系统级别上的全局性，即文件系统中的操作可以在多个进程中异步进行，这可能引起许多问题，也就是说文件系统不是串行系统。
文件系统具有很大的系统相关性，...
Where to put Gradle configuration (i.e. credentials) that should not be committed?
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~/.gradle/gradle.properties:
mavenUser=admin
mavenPassword=admin123
build.gradle:
...
authentication(userName: mavenUser, password: mavenPassword)
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“Variable” variables in Javascript?
... try using eval():
var data = "testVariable";
eval("var temp_" + data + "=123;");
alert(temp_testVariable);
Or using the window object:
var data = "testVariable";
window["temp_" + data] = 123;
alert(window["temp_" + data]);
http://www.hiteshagrawal.com/javascript/dynamic-variables-in-javascrip...
How to remove non-alphanumeric characters?
...'hello-world'); // helloworld
preg_replace('/[^\p{L}\p{N} ]+/', '', 'abc@~#123-+=öäå'); // abc123öäå
preg_replace('/[^\p{L}\p{N} ]+/', '', '你好世界!@£$%^&*()'); // 你好世界
Note: This is a very old, but still relevant question. I am answering purely to provide supplementary i...