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Can PostgreSQL index array columns?
...ators and the GIN-index type.
Example:
CREATE TABLE "Test"("Column1" int[]);
INSERT INTO "Test" VALUES ('{10, 15, 20}');
INSERT INTO "Test" VALUES ('{10, 20, 30}');
CREATE INDEX idx_test on "Test" USING GIN ("Column1");
-- To enforce index usage because we have only 2 records...
Retrieve column names from java.sql.ResultSet
...column count starting at 1. You can iterate through column names with for (int i = 1; i <= rsmd.getColumnCount(); i++) String name = rsmd.getColumnName(i);
– Alphaaa
Nov 19 '15 at 7:03
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How to parse Excel (XLS) file in Javascript/HTML5
...with it. I need to read xls file row-wise, read data in every column and convert it to JSON.
11 Answers
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No ConcurrentList in .Net 4.0?
... (also: on GitHub). My implementation had some problems, which I won't get into here. Let me tell you, more importantly, what I learned.
Firstly, there's no way you're going to get a full implementation of IList<T> that is lockless and thread-safe. In particular, random insertions and removal...
What is JavaScript's highest integer value that a number can go to without losing precision?
...
JavaScript has two number types: Number and BigInt.
The most frequently-used number type, Number, is a 64-bit floating point IEEE 754 number.
The largest exact integral value of this type is Number.MAX_SAFE_INTEGER, which is:
253-1, or
+/- 9,007,199,254,740,991, or...
What's the difference between an argument and a parameter?
...d definition. When a method is called, the arguments are the data you pass into the method's parameters.
public void MyMethod(string myParam) { }
...
string myArg1 = "this is my argument";
myClass.MyMethod(myArg1);
share...
How do I disable the 'Debug / Close Application' dialog on Windows Vista?
... Components -> Windows Error Reporting
Set "Prevent display of the user interface for critical errors" to Enabled
It is similar what was accomplished for Customer Experience reporting in:
http://www.blogsdna.com/2137/fix-windows-installer-explorer-update-has-stopped-working-in-windows-7.htm
...
C# naming convention for constants?
...le bit too anally retentive for many people's tastes). e.g.
private const int TheAnswer = 42;
The Pascal capitalization convention is also documented in Microsoft's Framework Design Guidelines.
share
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How do I fix “for loop initial declaration used outside C99 mode” GCC error?
...d luck on solving 3n+1 :-)
Here's an example:
#include <stdio.h>
int main() {
int i;
/* for loop execution */
for (i = 10; i < 20; i++) {
printf("i: %d\n", i);
}
return 0;
}
Read more on for loops in C here.
...
.Contains() on a list of custom class objects
...le:
public class CartProduct : IEquatable<CartProduct>
{
public Int32 ID;
public String Name;
public Int32 Number;
public Decimal CurrentPrice;
public CartProduct(Int32 ID, String Name, Int32 Number, Decimal CurrentPrice)
{
this.ID = ID;
this.Name = Na...