大约有 45,000 项符合查询结果（耗时：0.0523秒） [XML]
mysql create user if not exists
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I use
SELECT EXISTS (SELECT DISTINCT user FROM mysql.user WHERE user = "username") as is_user
should return 1 if exists or 0 if it does not
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Add a method breakpoint to all methods of a class in EclipseIDE
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The fastest way is to go to the "Outline" view and select all of the methods you want, right-click and click "Toggle Method Breakpoint"
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Generate MD5 hash string with T-SQL
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Use HashBytes
SELECT HashBytes('MD5', 'email@dot.com')
That will give you 0xF53BD08920E5D25809DF2563EF9C52B6
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SELECT CONVERT(NVARCHAR(32),HashBytes('MD5', 'email@dot.com'),2)
That will give you F53BD08920E5D25809DF2563EF9C52B6
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What does this symbol mean in IntelliJ? (red circle on bottom-left corner of file name, with 'J' in
...lder ("java" under src/main/java if it is a Maven project for example) and select Mark Directory As > Sources Root (see screenshot below).
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Hibernate - Batch update returned unexpected row count from update: 0 actual row count: 0 expected:
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The solution is to use select for update when fetching the record to lock the row, so nothing else can delete it before you do.
– Matthew Read
May 19 '19 at 15:02
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What is the best way to filter a Java Collection?
...without writing loops or inner classes:
List<Person> beerDrinkers = select(persons, having(on(Person.class).getAge(),
greaterThan(16)));
Can you imagine something more readable?
Disclaimer: I am a contributor on lambdaj
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Using str_replace so that it only acts on the first match?
...r downside is you have to use preg_quote() on the "needle" and escape meta-characters $ and \ in the replacement.
– Josh Davis
Aug 10 '09 at 2:53
32
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Android notification doesn't disappear after clicking the notifcation
...tTitle, contentText, pendingIntent);
// Cancel the notification after its selected
notification.flags |= Notification.FLAG_AUTO_CANCEL;
and to launch the app:
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Intent intent = ...
Postgres: SQL to list table foreign keys
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You can do this via the information_schema tables. For example:
SELECT
tc.table_schema,
tc.constraint_name,
tc.table_name,
kcu.column_name,
ccu.table_schema AS foreign_table_schema,
ccu.table_name AS foreign_table_name,
ccu.column_name AS foreign_column_nam...
String concatenation vs. string substitution in Python
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did you make tests with real large strings (like 100000 chars)?
– drnk
Apr 29 '09 at 7:16
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