大约有 42,000 项符合查询结果（耗时：0.0295秒） [XML]
Appending to an existing string
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You can use << to append to a string in-place.
s = "foo"
old_id = s.object_id
s << "bar"
s #=> "foobar"
s.object_id == old_id #=> true
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improv...
Android search with Fragments
...dy know of a tutorial or an example of how to implement the standard Android search interface with Fragment s? In other words, is it possible to put a standard search with a SearchManager in a Fragment?
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How to fetch the row count for all tables in a SQL SERVER database [duplicate]
... FROM sys.tables AS T INNER JOIN sys.sysindexes AS I ON T.object_id = I.id AND I.indid < 2 ORDER BY I.rows DESC
– Muhammad Sohail
May 25 '18 at 5:07
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SQLite add Primary Key
...ered Jun 3 '09 at 17:42
Nathan RidleyNathan Ridley
31.2k2828 gold badges113113 silver badges186186 bronze badges
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Select datatype of the field in postgres
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For example
I have the following table,
student_details (
stu_id integer,
stu_name varchar(30 ),
joined_date timestamp
);
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How do I remove documents using Node.js Mongoose?
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If you don't feel like iterating, try FBFriendModel.find({ id:333 }).remove( callback ); or FBFriendModel.find({ id:333 }).remove().exec();
mongoose.model.find returns a Query, which has a remove function.
Update for Mongoose v5.5.3 - remove() is now deprecated. Use deleteOne(), de...
Multiple Updates in MySQL
...SERT ... ON DUPLICATE KEY UPDATE.
Using your example:
INSERT INTO table (id,Col1,Col2) VALUES (1,1,1),(2,2,3),(3,9,3),(4,10,12)
ON DUPLICATE KEY UPDATE Col1=VALUES(Col1),Col2=VALUES(Col2);
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How do I find which transaction is causing a “Waiting for table metadata lock” state?
...ist of blocking transactions:
SELECT *
FROM INNODB_LOCKS
WHERE LOCK_TRX_ID IN (SELECT BLOCKING_TRX_ID FROM INNODB_LOCK_WAITS);
OR
SELECT INNODB_LOCKS.*
FROM INNODB_LOCKS
JOIN INNODB_LOCK_WAITS
ON (INNODB_LOCKS.LOCK_TRX_ID = INNODB_LOCK_WAITS.BLOCKING_TRX_ID);
A List of locks on particular...
Remove array element based on object property
... if the array is a tree structure ar beforeDeleteOperationArray=[ { "id": 3.1, "name": "test 3.1", "activityDetails": [ { "id": 22, "name": "test 3.1" }, { "id": 23, "name": "changed test 23" } ] } ] and I want to delete id...
Pandas DataFrame column to list [duplicate]
... Thanks that works! I want to delete the duplicates out of the ID list. I tried using set(ID) but gives an error saying TypeError: unhashable type: 'list'
– user3646105
May 20 '14 at 0:18
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