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Can I have multiple primary keys in a single table?
...r example:
CREATE TABLE userdata (
userid INT,
userdataid INT,
info char(200),
primary key (userid, userdataid)
);
Update: Here is a link with a more detailed description of composite primary keys.
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Html List tag not working in android textview. what can i do?
Html List tag not working in android TextView. This is my string content:
15 Answers
1...
Fastest way to check if a file exist using standard C++/C++11/C?
...idn't.
#include <sys/stat.h>
#include <unistd.h>
#include <string>
#include <fstream>
inline bool exists_test0 (const std::string& name) {
ifstream f(name.c_str());
return f.good();
}
inline bool exists_test1 (const std::string& name) {
if (FILE *file =...
Getting command-line password input in Python
...ompt is on the stderr (you will also need import sys): getpass.getpass(<string>,sys.stderr)
– Philip Kearns
May 28 '19 at 9:29
...
C++静态和多态，亦敌亦友 - C/C++ - 清泛网 - 专注C/C++及内核技术
...(void){ cout << "DerivedAgain::foo()"<< endl; }
} ;
int main(int argc, char** argv)
{
DerivedAgain da;
Base* pB = &da;
da.foo();
pB->foo();
return 0;
}
上述代码运行结果是什么？等等，你确定上述代码能通过编译？在笔者Ubuntu 12.04 + gcc...
Finding most changed files in Git
...ranch you are on.
git log --pretty=format: --name-only | Where-Object { ![string]::IsNullOrEmpty($_) } | Sort-Object | Group-Object | Sort-Object -Property Count -Descending | Select-Object -Property Count, Name -First 10
...
Encrypt Password in Configuration Files? [closed]
...tKeySpec;
public class ProtectedConfigFile {
public static void main(String[] args) throws Exception {
String password = System.getProperty("password");
if (password == null) {
throw new IllegalArgumentException("Run with -Dpassword=<password>");
}
...
How to print to console when using Qt
...t useful:
#include <QTextStream>
QTextStream out(stdout);
foreach(QString x, strings)
out << x << endl;
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How do I change read/write mode for a file using Emacs?
...t args)
"Run a unix command and, if it returns 0, return the output as a string.
Otherwise, signal an error. The error message is the first line of the output."
(let ((output-buffer (generate-new-buffer "*stdout*")))
(unwind-protect
(let ((return-value (apply 'call-process command nil
...
How to POST raw whole JSON in the body of a Retrofit request?
...s JSON as the sole body of the request.
public class FooRequest {
final String foo;
final String bar;
FooRequest(String foo, String bar) {
this.foo = foo;
this.bar = bar;
}
}
Calling with:
FooResponse = foo.postJson(new FooRequest("kit", "kat"));
Will yield the following body:...