大约有 510 项符合查询结果（耗时：0.0144秒） [XML]
Object reference not set to an instance of an object.Why doesn't .NET show which object is `null`?
...utes but rather IL:
IL_0001: ldnull
IL_0002: stloc.0 // s
IL_0003: ldloc.0 // s
IL_0004: callvirt System.String.get_Length
IL_0009: call System.Console.WriteLine
It is the callvirt opcode that throws the NullReferenceException and it does that when the first argument...
Launch custom android application from android browser
...example, let's say the user clicked on a link to http://twitter.com/status/1234:
Uri data = getIntent().getData();
String scheme = data.getScheme(); // "http"
String host = data.getHost(); // "twitter.com"
List<String> params = data.getPathSegments();
String first = params.get(0); // "status"...
How do I use an INSERT statement's OUTPUT clause to get the identity value?
...INTO MyTable(Name, Address, PhoneNo)
OUTPUT INSERTED.ID
VALUES ('Yatrix', '1234 Address Stuff', '1112223333')
You can use this also from e.g. C#, when you need to get the ID back to your calling app - just execute the SQL query with .ExecuteScalar() (instead of .ExecuteNonQuery()) to read the resu...
Python - Create a list with initial capacity
... '__main__':
main()
Evaluation:
prealloc_array_by_appending took 118.00003051757812 ms
prealloc_array_by_extending took 102.99992561340332 ms
prealloc_array took 3.000020980834961 ms
prealloc_array took 49.00002479553223 ms
prealloc_array took 316.9999122619629 ms
prealloc_array took 473.000049...
How to get name of exception that was caught in Python?
...nswered Aug 11 '13 at 21:06
user1234user1234
4,93533 gold badges2222 silver badges3434 bronze badges
...
Python's “in” set operator
...ions like issubset():
>>> k
{'ip': '123.123.123.123', 'pw': 'test1234', 'port': 1234, 'debug': True}
>>> set('ip,port,pw'.split(',')).issubset(set(k.keys()))
True
>>> set('ip,port,pw'.split(',')) in set(k.keys())
False
...
Check if a string matches a regex in Bash script
... strings, which IMHO it shouldn't. Suppose badvar is not defined, then [[ "1234" =~ "$badvar" ]]; echo $? gives (incorrectly) 0, while expr match "1234" "$badvar" >/dev/null ; echo $? gives correct result 1.
We have to use >/dev/null to hide expr match's output value, which is the number of c...
Create new user in MySQL and give it full access to one database
...
To me this worked.
CREATE USER 'spowner'@'localhost' IDENTIFIED BY '1234';
GRANT ALL PRIVILEGES ON test.* To 'spowner'@'localhost';
FLUSH PRIVILEGES;
where
spowner : user name
1234 : password of spowner
test : database 'spowner' has access right to
...
How do I cast a string to integer and have 0 in case of error in the cast with PostgreSQL?
...value;
END;
$$ LANGUAGE plpgsql;
Testing:
=# select convert_to_integer('1234');
convert_to_integer
--------------------
1234
(1 row)
=# select convert_to_integer('');
NOTICE: Invalid integer value: "". Returning NULL.
convert_to_integer
--------------------
(1 row)
=# sele...
Convert JS Object to form data
... which is like this:
{
"orderPrice":"11",
"cardNumber":"************1234",
"id":"8796191359018",
"accountHolderName":"Raj Pawan",
"expiryMonth":"02",
"expiryYear":"2019",
"issueNumber":null,
"billingAddress":{
"city":"Wonderland",
"code":"8796682911767",
"f...