statements

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . Unfortunately the snippet of code below is not functioning as it should. It's attached to a JLabel so that when clicked, notices whether PlayerOne or

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . Unfortunately the snippet of code below is not functioning as it should. It's attached to a JLabel so that when clicked, notices whether PlayerOne or

问题 I don't know what's missing or why it isn't displaying data. My code is working if I'm not using prepared statements. When I used prepared statements, it seems that code is not working anymore. db.php Class Database{ public $mysqli; public function __construct($db_host, $db_user, $db_password, $db_name){ $this->con = new mysqli($db_host, $db_user, $db_password, $db_name); } public function selectUserInfo($id){ $stmt = $this->con->prepare("SELECT * FROM users WHERE os_id = ?"); $stmt->bind

问题 I'm trying to insert into a database for the first time using PDO but I keep getting the error Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY093]: Invalid parameter number: parameter was not defined' on line 25 Google tells me there is a mis match somewhere with the values I'm inserting but from what I can tell they add up $db = new PDO("mysql:host=$servername;dbname=$dbname",$username,$password); $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $stmt =

问题 I have created a form with several user inputs but have the tedious task of checking whether each individual input is not empty before submission. Is there a quicker way, (such as using arrays perhaps) of listing all arguments to the if statement? At the moment my code looks like this but if possible I would like it to be more efficient in future, like if I were to add more inputs. <form action="sign-up.php" method="post" autocomplete="off" > Name:<input type="text" name="name" /> Username:<

问题 I am working on a mutation test framework for SQL Server, for this I need to be able to calculate what lines of a stored procedure, function or trigger are executed when I execute a certain stored procedure. The difficult part is that I want to know the exact lines or statements being executed from the stored procedure I call. With a query like this I can see what stored procedures/triggers/functions are being executed, since I know when I call the stored procedure I can use the time to see

问题 I'm new in python programming and I'm having some issues in developing a specific part of my GUI with Tkinter. What I'm trying to do is, a space where the user could enter (type) his math equation and the software make the calculation with the variables previously calculated. I've found a lot of calculators for Tkinter, but none of then is what I'm looking for. And I don't have much experience with classes definitions. I made this simple layout to explain better what I want to do: import

问题 I have a cat that runs across the screen and stops to scratch in the middle of the screen twice. My current code looks like private void scratch(){ for (int i = xPos; i < getWidth(); i+=0) { xPos = i; // swap images if (currentImage == nekoPics[0]) currentImage = nekoPics[2]; else if (currentImage == nekoPics[2]) currentImage = nekoPics[4]; else if (currentImage == nekoPics[4]) currentImage = nekoPics[5]; else if (currentImage == nekoPics[5]) currentImage = nekoPics[4]; else if (currentImage

问题 I'm currently working with a SQLite database in java. But I would like to export all the tables and their data to SQL statements. I've tried using: "SELECT * FROM TABLENAMES INTO OUTFILE '...' But that gives me an error: " near "INTO": syntax error " 回答1: To achieve that, you can use outer software, such as SQLDeveloper or SQLAdministrator. IntelliJ in Ultimate edition also supports exporting table data. UPDATE: If you want to export it using only sql you can use sqlite3 db .dump See also

问题 I am using two select statments in a php page as follows: $num1 = mysql_query("SELECT SId FROM mtable WHERE Pathogen='$pathogen1' && Topic='$topic1' && Indicator='$ind1' && IndicatorSubGroup='$subind1' "); and $num2 = mysql_query("SELECT SId FROM mtable WHERE Pathogen='$pathogen2' && Topic='$topic2' && Indicator='$ind2' && IndicatorSubGroup='$subind2' "); at present the result is displayed using separate while loops as follows while($nval= mysql_fetch_array($num1)) { $vv=$nval['SId']; $result