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How do you add an array to another array in Ruby and not end up with a multi-dimensional result?
...ow how to concat to an existing array, not create a new array that was the union of two arrays.
– phatmann
Jun 15 '12 at 13:55
1
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Not equal != operator on NULL
...
As a manual workaround, you could commonly SELECT * FROM MyTable WHERE coalesce(MyColumn, 'x') <> 'x' to assign a constant if it is NULL value, providing you give an appropriate datatype for the sentinel value x (in this case a string/char). This is TSQL syntax ...
SQL Developer is returning only the date, not the time. How do I fix this?
...WOW... this was beautiful. Can't believe I was doing the conversion in the select statement.
– Leniel Maccaferri
Sep 21 '13 at 0:07
16
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How to make my custom type to work with “range-based for loops”?
...ample of why this is useful is that your end iterator can read "check your char* to see if it points to '0'" when == with a char*. This allows a C++ range-for expression to generate optimal code when iterating over a null-terminated char* buffer.
struct null_sentinal_t {
template<class Rhs,
...
How do you determine the size of a file in C?
...include <sys/stat.h>
#include <sys/types.h>
off_t fsize(const char *filename) {
struct stat st;
if (stat(filename, &st) == 0)
return st.st_size;
return -1;
}
Changes:
Made the filename argument a const char.
Corrected the struct stat definition, which was...
Why does this code using random strings print “hello world”?
... @Vulcan Most seeds are very close to the maximum value, just like if you select random numbers between 1 and 1000, most numbers you end up picking will have three digits. It's not surprising, when you think about it :)
– Thomas
Mar 3 '13 at 22:28
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OceanBase使用libeasy原理源码分析：服务器端 - 数据库(内核) - 清泛网 - ...
...EASY_OK,则signal信号量，从而工作线程被唤醒。
典型的，select请求这种需要回复多个包给MySQL客户端的场景使用的都是这种模式
其它诸如只需要回复一个包给MySQL客户端的DML操作，例如INSERT,UPDATE等也使用这种模式，只是工作线程...
各编程语言读写文件汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术
...puts简单读写，一般用于处理文本文件。
int main(int argc, char* argv[])
{
FILE *fp = NULL;
/*打开文件*/
if((fp = fopen("test.txt", "w+")) == NULL)
{
printf("文件打开出错，请检查文件是否存在！\n");
return -1;
}
else
{
printf("文件已经...
Query to list number of records in each table in a database
...
If you're using SQL Server 2005 and up, you can also use this:
SELECT
t.NAME AS TableName,
i.name as indexName,
p.[Rows],
sum(a.total_pages) as TotalPages,
sum(a.used_pages) as UsedPages,
sum(a.data_pages) as DataPages,
(sum(a.total_pages) * 8) / 1024 as To...
How to remove all the occurrences of a char in c++ string
...
Basically, replace replaces a character with another and '' is not a character. What you're looking for is erase.
See this question which answers the same problem. In your case:
#include <algorithm>
str.erase(std::remove(str.begin(), str.end(), 'a...