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Articles by Vikyath Ram
Page 10 of 10
Java DatabaseMetaData getSQLKeywords() method with example
This method retrieves the list of all the SQL keywords of the underlying database and returns in the form of a String variable which holds all the keywords separated by commas.To get the list of keywords in the database −Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of a user in the database, as String variables.Get the DatabaseMetaData ...
Read MoreJava DatabaseMetaData getUserName() method with example
This method retrieves the user name used to establish the current connection −To retrieve the user name as known to the database −Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of a user in the database, as String variables.Get the DatabaseMetaData object with respect to the current connection using the getMetaData() method of the Connection interface.Finally, retrieve the ...
Read MoreJava ResultSet getRow() method with example
When we execute certain SQL queries (SELECT query in general) they return tabular data.The java.sql.ResultSet interface represents such tabular data returned by the SQL statements.i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general).The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned before first row.The getRow() method of the ResultSet interface retrieves the current row number/position of the ResultSet pointer.This method returns an integer value representing the current row number to which the ResultSet pointer points to.ExampleLet us ...
Read MoreUse boolean value to stop a thread in Java
A thread can be created by implementing the Runnable interface and overriding the run() method. Then a Thread object can be created and the start() method called.A thread can be stopped using a boolean value in Java. The thread runs while the boolean value stop is false and it stops running when the boolean value stop becomes true.A program that demonstrates this is given as follows:Exampleclass ThreadDemo extends Thread { public boolean stop = false; int i = 1; public void run() { while (!stop) { try { ...
Read MorePython program to generate all possible valid ID address from given string
String is given. String contains only digit. Our task is to check all possible valid IP address combinations. Here first we check the length of the string then split by ".". Then we check the different combination of ".". Example Input : "255011123222" It's not a valid IP address. Input : 255011345890 Valid IP address is 255.011.123.222 Algorithm Step 1: First check the length of the string. Step 2: Split the string by ".". We will place 3 dots in the given string. W, X, Y, and Z are numbers from 0-255 the numbers cannot be ...
Read MoreWhat does abstract modifier in Java do?
An abstract keyword is used to declare methods abstract methods and abstract classes. Once a method is declared abstract we should not specify body for those. Example public abstract class Sample{ public abstract demo(){ } } Error Sample.java:2: error: invalid method declaration; return type required public abstract demo(){ ^ 1 error And once a class is declared abstract it cannot be instantiated. Example public abstract class Sample{ public abstract void demo(); public static void main(String args[]){ new Sample(); } } Error C:\Sample>javac Sample.java Sample.java:4: error: Sample is abstract; cannot be instantiated new Sample(); ^ 1 error
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