大约有 40,000 项符合查询结果（耗时：0.0377秒） [XML]
How to create a multi-tenant database with shared table structures?
Our software currently runs on MySQL. The data of all tenants is stored in the same schema. Since we are using Ruby on Rails we can easily determine which data belongs to which tenant. However there are some companies of course who fear that their data might be compromised, so we are evaluating othe...
Get names of all keys in the collection
...p with $addToSet to get distinct keys across the entire collection. (Use $$ROOT for referencing the top level document.)
db.things.aggregate([
{"$project":{"arrayofkeyvalue":{"$objectToArray":"$$ROOT"}}},
{"$unwind":"$arrayofkeyvalue"},
{"$group":{"_id":null,"allkeys":{"$addToSet":"$arrayofkey...
How to get next/previous record in MySQL?
...ding that a primary key colum is not meant as a column to sort by, because MySQL does not guarantee that higher, auto incremented, values are necessarily added at a later time.
If you don't care about this, and simply need the record with a higher (or lower) id then this will suffice. Just don't us...
CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的整个过程。CDN网络是在用户和服务器之间增加Cache层，如何将用户的请求引导到Cache上获得源服务器的数据，主要是通过接管DNS实现，下面让我们看看访问使用CDN缓存后的网站的过程：
通过上图，我们可以了解到，使用了CDN...
How to declare a variable in MySQL?
How to declare a variable in mysql, so that my second query can use it?
7 Answers
7
...
项目管理实践【五】自动编译和发布网站【Using Visual Studio with Source ...
...【Daily Build Using CruiseControl NET and MSBuild】中，我们讲解了如何使用CCNET+MSBuild 在上一篇教程项目管理实践【三】每日构建【Daily Build Using CruiseControl.NET and MSBuild】 中，我们讲解了如何使用CCNET+MSBuild来自动编译项目，今天我们讲...
How can I suppress column header output for a single SQL statement?
I'm executing some SQL statements in batch (using the mysql command-line binary). I want one of my several SELECT statements to not print the column headers, just the selected records. Is this possible?
...
What are Flask Blueprints, exactly?
...aves")
def leaves():
return "This tree has leaves"
@tree_mold.route("/roots")
def roots():
return "And roots as well"
@tree_mold.route("/rings")
@tree_mold.route("/rings/<int:year>")
def rings(year=None):
return "Looking at the rings for {year}".format(year=year)
This is a simp...
Ordering by the order of values in a SQL IN() clause
...
Use MySQL's FIELD() function:
SELECT name, description, ...
FROM ...
WHERE id IN([ids, any order])
ORDER BY FIELD(id, [ids in order])
FIELD() will return the index of the first parameter that is equal to the first parameter (o...
How to solve “Could not establish trust relationship for the SSL/TLS secure channel with authority”
...ient (bad move, man in the
middle attacks abound)
use makecert to create a root CA and
create certificates from that (ok
move, but there is still no CRL)
create an internal root CA using
Windows Certificate Server or other
PKI solution then trust that root
cert (a bit of a pain to manage)
purchase ...