大约有 900 项符合查询结果（耗时：0.0161秒） [XML]
Create unique constraint with null columns
...0000-0000-0000-0000-000000000000'), RecipeId);
You'd just need to pick a UUID for the COALESCE that will never occur in "real life". You'd probably never see a zero UUID in real life but you could add a CHECK constraint if you are paranoid (and since they really are out to get you...):
alter tabl...
How do I get user IP address in django?
... answered May 12 '11 at 9:38
SævarSævar
1,38788 silver badges1212 bronze badges
...
JAX-RS — How to return JSON and HTTP status code together?
...
Here's an example:
@GET
@Path("retrieve/{uuid}")
public Response retrieveSomething(@PathParam("uuid") String uuid) {
if(uuid == null || uuid.trim().length() == 0) {
return Response.serverError().entity("UUID cannot be blank").build();
}
Entity en...
How do I initialize a byte array in Java?
I have to store some constant values (UUIDs) in byte array form in java, and I'm wondering what the best way to initialize those static arrays would be. This is how I'm currently doing it, but I feel like there must be a better way.
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Is iterating ConcurrentHashMap values thread safe?
...tHashMap:
import java.util.Map;
import java.util.Random;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class ConcurrentMapIteration
{
private final Map<String, String> map = n...
How to get POSTed JSON in Flask?
..., request, jsonify
app = Flask(__name__)
@app.route('/api/add_message/<uuid>', methods=['GET', 'POST'])
def add_message(uuid):
content = request.json
print content['mytext']
return jsonify({"uuid":uuid})
if __name__ == '__main__':
app.run(host= '0.0.0.0',debug=True)
...
What is the iBeacon Bluetooth Profile
...
For an iBeacon with ProximityUUID E2C56DB5-DFFB-48D2-B060-D0F5A71096E0, major 0, minor 0, and calibrated Tx Power of -59 RSSI, the transmitted BLE advertisement packet looks like this:
d6 be 89 8e 40 24 05 a2 17 6e 3d 71 02 01 1a 1a ff 4c 00 02 15 e2 c5...
Generating a random & unique 8 character string using MySQL
...ting an 8-character long pseudo-random string in pure (My)SQL:
SELECT LEFT(UUID(), 8);
You can try the following (pseudo-code):
DO
SELECT LEFT(UUID(), 8) INTO @plate;
INSERT INTO plates (@plate);
WHILE there_is_a_unique_constraint_violation
-- @plate is your newly assigned plate number
S...
How to find the statistical mode?
...ered Dec 14 '12 at 8:00
Rasmus BååthRasmus Bååth
3,62222 gold badges2121 silver badges2525 bronze badges
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How to suppress GCC warnings from library headers?
...gma GCC diagnostic ignored "-Wunused-but-set-variable"
#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_generators.hpp>
#include <boost/uuid/uuid_io.hpp>
#include <boost/lexical_cast.hpp>
// turn the warnings back on
#pragma GCC diagnostic pop
...