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Imitate Facebook hide/show expanding/contracting Navigation Bar
... @Thuy great work man! So I have this working on perfectly on a table view controller except one thing... I have pull to refresh implemented at the top. It gets weird when trying to pull down and refresh. Might there be a workaround for this?
– aherrick
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Subqueries vs joins
...ed as a join in which case it executes the subquery for each record in the table rather then join the table in the subquery against the table you are querying. Some of the more "enterprisey" database are better at this, but they still miss it sometimes.
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#1071 - Specified key was too long; max key length is 767 bytes
...
767 bytes is the stated prefix limitation for InnoDB tables in MySQL version 5.6 (and prior versions). It's 1,000 bytes long for MyISAM tables. In MySQL version 5.7 and upwards this limit has been increased to 3072 bytes.
You also have to be aware that if you set an index on a...
Cause of a process being a deadlock victim
... another process doing updates and inserts into the same database and same tables. The first process has started, recently to end prematurely with a message
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Is there a way to remove the separator line from a UITableView?
I'm looking for a way to completely remove the separator line in a UITableView when in the plain mode. This is done automatically in grouped, but this also changes the dimensions of the table in a way that is hard to measure. I have set the seperator line color to colorClear. But this does not compl...
Storing SHA1 hash values in MySQL
...ary.
I compared storage requirements for BINARY(20) and CHAR(40).
CREATE TABLE `binary` (
`id` int unsigned auto_increment primary key,
`password` binary(20) not null
);
CREATE TABLE `char` (
`id` int unsigned auto_increment primary key,
`password` char(40) not null
);
With milli...
LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... M=4; N=2; seed=1234567;
enddata
sets:
rows/1..M/;
cols/1..N/;
table(rows,cols): x;
endsets
data:
X=@qrand(seed);
enddata
end
如果没有为函数指定种子，那么LINGO将用系统时间构造种子。
14．@rand(seed)
返回0和1间的伪随机数，依赖于指定的种...
Advantage of switch over if-else statement
...tree (saves compares and jumps in the average case) or simply build a jump-table (works without compares at all).
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SELECT DISTINCT on one column
...R() OVER (PARTITION BY PRODUCT ORDER BY ID) AS RowNumber
FROM MyTable
WHERE SKU LIKE 'FOO%') AS a
WHERE a.RowNumber = 1
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Where do “pure virtual function call” crashes come from?
...will not happen if the base class has been declared with the __declspec(novtable) optimization (Microsoft specific). With that, it's entirely possible to call an overridden virtual method after the object has been deleted, which could mask the problem until it bites you in some other form. The _pure...