assertion

问题 in order to make the following type of assertion create assertion assert check "EMPTY SET" = (select User from Video where date=current_date() group by user having count(*) >= 10 is this assertion right? create assertion assert check 0 = (select count(*) from Video where date=current_date() group by user having count(*) >= 10 回答1: For full details on CREATE ASSERTION see the ISO SQL-92 Standard spec. The CHECK definition should be in parentheses. CURRENT_DATE does not have parentheses. USER

问题 Is there a way to break the debugger when assertion is false and running the application using Visual Studio debugger. Earlier when I was debugging Windows application I would get an exception and the debugger would break, but now on Smart Device an assertion failed window is showed with stack trace, but I would also like to see variable values etc. 回答1: Stupid me, the solution was simple. When the window pops out, press pause in debugger :) 回答2: Not sure about VS 2008, but in at least 2010

问题 This code fails when I try to debug it using VC2010: char frd[32]="word-list.txt"; FILE *rd=fopen(frd,"r"); if(rd==NULL) { std::cout<<"Coudn't open file\t"<<frd; exit(1); } char readLine[100]; while(fgets(readLine, 100, rd) != NULL) { readLine[strlen(readLine) - 1] = '\0'; char *token = NULL; token = strtok(readLine, " ,"); insert(readLine); } Debugging results in --------------------------- Microsoft Visual C++ Debug Library----------- Debug Assertion Failed! Program: ...\documents\visual

问题 I'm having trouble playing music in Pygame. I type: pygame.mixer.music.load("Maid with the Flaxen Hair.mp3") pygame.mixer.music.play(-1, 0.0) but I get this message: Assertion failed! Program: C\Python33\pythonw.exe File:..\..\audio\mpegtoraw.cpp Line: 505 Expression: audio->rawdatawriteoffset > len Then it tells me to see C++ documentation. It's not the loading of the music, it's the playing that causes the message. I tried different music files too. 回答1: Just to update, I had the same error

问题 I am using preg_replace to replace a list of words in a text that may contain some urls. The problem is that I don't want to replace these words if they're part of a url. These examples should be ignored: foo.com foo.com/foo foo.com/foo/foo For a basic example (written in php), I tried to ignore strings containing .com and optional slashes and chars, using a negative look ahead assertion, but with no success: preg_replace("/(\b)foo(\b)/", "$1bar$2(?!(\w+\.\w+)*(\.com)([\.\/]\w+)*)", $text);

问题 What is the xUnit equivalent of the following MSTest code: Assert.Inconclusive("Reason"); This gives a yellow test result instead of the usual green or red. I want to assert that the test could not be run due to certain conditions and that the test should be re-run after those conditions have been met. 回答1: One way is to use the Skip parameter within the Fact or Theory attributes. [Fact(Skip = "It's not ready yet")] public void ReplaceTokensUnfinished() { var original = ""; var expected = "";

问题 Since I upgraded from Xcode 3.2.3 to 3.2.4 and iOS 4.0.1 to iOS 4.1 SDK, when I set a breakpoint in my code and single-step over instructions, at each step, the debugger will spit one or more of that line: Assertion failed: (cls), function getName, file /SourceCache/objc4_Sim/objc4-427.1.1/runtime/objc-runtime-new.m, line 3939 It doesn't happen on a specific line or for a specific instructions. I have a few breakpoints in my code and each time I hit one of those, the debugger starts spewing

问题 Does SQL Server 2008 support the CREATE ASSERTION syntax? I haven't been able to find a straight answer on this. 回答1: No SQL Server 2008 does not support this syntax. 回答2: No, you'd use a CHECK constraint or a TRIGGER instead, depending on complexity. CHECK constraint: at the row level only TRIGGER: across rows or using other tables 回答3: SQL Server 2008 does not support CREATE ASSERTION . In fact, no current SQL products support CREATE ASSERTION properly. Sybase SQL Anywhere supports it but

问题 What is the expected syntax for checking exception messages in MiniTest's assert_raises / must_raise ? I'm trying to make an assertion something like the following, where "Foo" is the expected error message: proc { bar.do_it }.must_raise RuntimeError.new("Foo") 回答1: You can use the assert_raises assertion, or the must_raise expectation. it "must raise" do assert_raises RuntimeError do bar.do_it end -> { bar.do_it }.must_raise RuntimeError lambda { bar.do_it }.must_raise RuntimeError proc {

问题 Following is an Assertion Error report (displayed on console) when calling cvtColor() function in opencv giving the argument CV_GRAY2BGR on a Mat object which is already a BGR image. I want to know how to interpret this error message by a person who yet doesn't know what the error here. (Hope some erudites won't vote to close this question as off topic, as I know there is a big value in learning to read Assertion or any other error messages for newbees for c++. ) And as I guess this might be