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MySQL pagination without double-querying?
... help a lot.
The other way is to use SQL_CALC_FOUND_ROWS clause and then call SELECT FOUND_ROWS(). apart from the fact you have to put the FOUND_ROWS() call afterwards, there is a problem with this: There is a bug in MySQL that this tickles that affects ORDER BY queries making it much slower on lar...
How to duplicate object properties in another object?
...r the idea of applying any rules to any situation harmful and unwise. Like all these pattern-driven development practices that are going on, so don't take it personal…
– Michael Krelin - hacker
Oct 3 '12 at 20:03
...
Reshaping data.frame from wide to long format
...s melt/cast. Here is a solution with reshape, assuming your data frame is called d:
reshape(d,
direction = "long",
varying = list(names(d)[3:7]),
v.names = "Value",
idvar = c("Code", "Country"),
timevar = "Year",
times = 1950:1954)
...
How to grep (search) committed code in the Git history
...s and the like), you need to do:
git grep <regexp> $(git rev-list --all)
git rev-list --all | xargs git grep <expression> will work if you run into an "Argument list too long" error.
If you want to limit the search to some subtree (for instance, "lib/util"), you will need to pass tha...
HTTP GET Request in Node.js Express
...,
path: '/some/path',
method: 'GET',
headers: {
'Content-Type': 'application/json'
}
};
And providing a callback function.
For example, in a service, I require the REST module above and then do this:
rest.getJSON(options, (statusCode, result) => {
// I could work with the result...
How to check if an object is an array?
... {
Array.isArray = function(obj) {
return Object.prototype.toString.call(obj) === '[object Array]';
}
};
If you use jQuery you can use jQuery.isArray(obj) or $.isArray(obj). If you use underscore you can use _.isArray(obj)
If you don't need to detect arrays created in different frames you...
Define global variable in a JavaScript function
...
Yes, as the others have said, you can use var at global scope (outside of all functions) to declare a global variable:
<script>
var yourGlobalVariable;
function foo() {
// ...
}
</script>
Alternately, you can assign to a property on window:
<script>
function foo() {
wi...
The point of test %eax %eax [duplicate]
...the arguments to CMP are equal.
So,
TEST %eax, %eax
JE 400e77 <phase_1+0x23>
jumps if the %eax is zero.
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Search for one value in any column of any table inside a database
...
How to search all columns of all
tables in a database for a keyword?
http://vyaskn.tripod.com/search_all_columns_in_all_tables.htm
EDIT: Here's the actual T-SQL, in case of link rot:
CREATE PROC SearchAllTables
(
@SearchStr nvarchar...
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然后就想主要业务方向，我第一句话就统一了思想，必须是O2O——社区O2O，猪都能飞起来的风...