exception

问题 I have a table with a column that must have UNIQUE values (but it could be also a multiple-column UNIQUE index, the problem is the same). In my PHP script I have to insert a row in that table. I'm searching for a way, not MySQL-specific, to exit the PHP script if there's a problem, and the problem is not a violation of a UNIQUE constraint. To make things more easy I don't want to use a SELECT query before :D Currently I'm doing something like this: try { $stmt = $dbh->prepare($someinsertquery

问题 I have a table with a column that must have UNIQUE values (but it could be also a multiple-column UNIQUE index, the problem is the same). In my PHP script I have to insert a row in that table. I'm searching for a way, not MySQL-specific, to exit the PHP script if there's a problem, and the problem is not a violation of a UNIQUE constraint. To make things more easy I don't want to use a SELECT query before :D Currently I'm doing something like this: try { $stmt = $dbh->prepare($someinsertquery

问题 is it possible to trace all exceptions in Tomcat server (or, in general, JVM)? Thanks for all! P.S. I need it because exception occurs in org.primefaces.application.PrimeResourceHandler.handleResourceRequest() and a trivial message is printed (line 79) 回答1: Sure. Start tomcat using that: ./catalina jpda start And then connect using the eclipse debugger, as described here: http://wiki.apache.org/tomcat/FAQ/Developing#Q1 When for example Eclipse is connected, go to the Breakpoints panel, there

问题 is it possible to trace all exceptions in Tomcat server (or, in general, JVM)? Thanks for all! P.S. I need it because exception occurs in org.primefaces.application.PrimeResourceHandler.handleResourceRequest() and a trivial message is printed (line 79) 回答1: Sure. Start tomcat using that: ./catalina jpda start And then connect using the eclipse debugger, as described here: http://wiki.apache.org/tomcat/FAQ/Developing#Q1 When for example Eclipse is connected, go to the Breakpoints panel, there

问题 I've been mixing and matching code, trying to learn by example for using KeyStores. I have this createKeyStore method: private static KeyStore createKeyStore(String fileName, String pw) throws Exception { File file = new File(fileName); final KeyStore keyStore = KeyStore.getInstance("JCEKS"); if (file.exists()) { // .keystore file already exists => load it keyStore.load(new FileInputStream(file), pw.toCharArray()); } else { // .keystore file not created yet => create it keyStore.load(null,

问题 I'm stuck between some unusual problem.My app was running properly but I did some changes and switch the workspace. Now if I run my project the application closes with " Force to close " dialog. I couldn't understand my log cat error detail. Edit: R File: public static final int main=0x7f030004; Java Code: public class AlphaKidsActivity extends Activity implements OnClickListener{ MediaPlayer mp1; MediaPlayer mp2; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate

问题 I try to catch a termination signal to my code to write a restart file before exiting. My solution is based on this answer. #include <exception> #include <csignal> #include <iostream> class InterruptException : public std::exception { public: InterruptException(int _s) : signal_(_s) { } int signal() const noexcept { return this->signal_; } private: int signal_; }; /// method to throw exception at signal interrupt void sig_to_exception(int s) { throw InterruptException(s); } int main() { //

问题 So I'm trying to serialize only those properties of an interface that exist in the interface, not the underlying type itself. To that end, by following this, I've written the following code: public static IEnumerable<T> ToInterfacedObjects<T>(this IEnumerable<T> data) where T : class { var list = new List<T>(); var properties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance); foreach (var datum in data) { var moq = new Mock<T>(); foreach (var propertyInfo in properties) {

问题 I had this weird trouble running my unittest in Python: I used assertRaises, and running the unittest raised the correct exception, but the test still failed. Ok I cannot really explain it, please see the traceback for yourself: Error Traceback (most recent call last): File "/Users/chianti/PycharmProjects/Programming_Project/Part1and4/Part1and4Test.py", line 32, in test_non_alpha_name self.assertRaises(RestNameContainNonAlphaError, RestaurantName(self.non_alpha_name)) File "/Users/chianti

问题 I'm trying to invalidate a session. When I call: session.invalidate() it throws java.lang.IllegalStateException: getLastAccessedTime: Session already invalidated Any idea why? I can see the session and it's values just before the invalidate line. 回答1: You can use an HttpSessionListener to understand where and when the Session is timing-out or getting invalidated before you call the invalidate yourself. 来源： https://stackoverflow.com/questions/6055187/session-invalidate-illegalstateexception