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中文网（自研/维护）拓展 · App Inventor 2 中文网
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事件
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方法
RandomNumCode(length)
返回一个指定位数随机数字码。
SendSms(phoneNumber,signName,templateCode,templateParam)
发送短信。参数：手机号，签名名称，模板CODE，模板参数JSON
Clie...
How do I use cascade delete with SQL Server?
I have 2 tables: T1 and T2, they are existing tables with data. We have a one to many relationship between T1 and T2. How do I alter the table definitions to perform cascading delete in SQL Server when a record from T1 is deleted, all associated records in T2 also deleted.
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Generate array of all letters and digits
Using ruby, is it possible to make an array of each letter in the alphabet and 0-9 easily?
7 Answers
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Postgres: clear entire database before re-creating / re-populating from bash script
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I'd just drop the database and then re-create it. On a UNIX or Linux system, that should do it:
$ dropdb development_db_name
$ createdb developmnent_db_name
That's how I do it, actually.
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“ImportError: No module named” when trying to run Python script
...t. I get a ImportError: No module named ..., however, if I launch ipython and import the same module in the same way through the interpreter, the module is accepted.
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How to get the instance id from within an ec2 instance?
... of a more advanced use (retrieve instance ID as well as availability zone and region, etc.):
EC2_INSTANCE_ID="`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id || die \"wget instance-id has failed: $?\"`"
test -n "$EC2_INSTANCE_ID" || die 'cannot obtain instance-id'
EC2_AVAIL_ZONE=...
Unable to modify ArrayAdapter in ListView: UnsupportedOperationException
...elf...Found it didn't work. So i check out the source code of ArrayAdapter and found out the problem. The ArrayAdapter, on being initialized by an array, converts the array into a AbstractList (List) which cannot be modified.
Solution
Use an ArrayList<String> instead using an array while init...
Can you supply arguments to the map(&:method) syntax in Ruby?
You're probably familiar with the following Ruby shorthand ( a is an array):
7 Answers
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Connecting to TCP Socket from browser using javascript
I have a vb.net application that opens a socket and listens on it.
6 Answers
6
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String literals: Where do they go?
...e string literals changeable (it will be highly dependent on your platform and could change over time), just use arrays:
char foo[] = "...";
The compiler will arrange for the array to get initialized from the literal and you can modify the array.
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