Java Articles - Page 244 of 440

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 requires 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 the first row. Java ResultSet isLast() Method The isLast() method of the ResultSet interface is used to determine whether the cursor is on the last row of the ... Read More

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 isBeforeFirst() method of the ResultSet interface is used to determine whether the cursor is at the default position of the ResultSet.rs.isBeforeFirst();This method returns an boolean this value is true, if the cursor is ... Read More

The ResultSet interface in Java is used to retrieve data from a database in a tabular form. The isAfterLast() method is one of the navigation methods in the ResultSet that helps in checking the position of the cursor. Specifically, isAfterLast() checks whether the cursor is positioned after the last row of the result set. Method Definition The isAfterLast() method of the ResultSet interface is used to determine whether the cursor is after the end of the ResultSet.This method returns a boolean this value is true, if the cursor is after the end of the ResultSet else, it returns false. ... Read More

The getSearchStringEscape() method of the DatabaseMetaData interface is used to get the that is used to escape the wildcard characters ('_' or, '%') by the underlying database.This method returns a string parameter representing the value that is used to escape wildcard charactersTo get the DatabaseMetaData object −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, ... Read More

In this article, we will learn how to retrieve the list of time and date functions in the database using the getTimeDateFunctions() method of the DatabaseMetaData class in Java. getTimeDateFunctions() The getTimeDateFunctions() method retrieves the list of time and date functions supported by the current database. The names returned by this method are the Open CLI time and date function names. Steps to Retrieve Time and Date Functions in Database To get the list of the time and date functions supported by the underlying database − Step 1: Register the Driver: Make sure your database is ... Read More

This method retrieves the list of System functions supported by the current database. The names returned by this method are the Open CLI System function names.This method returns a String value holding the list of functions separated by commas (", ").To get the list of the System functions supported by the underlying 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 ... Read More

The getNumeric() method of the Connection interface retrieves the list of math functions supported by the current database. The names returned by this method are the Open CLI math function names.This method returns a String value holding the list of functions separated by commas (", ").To get the list of the numeric functions supported by the underlying 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 ... Read More

The commit() method of the Connection interface saves all the modifications made since the last commit.con.save()If any issue occurs after the commit you can revert all the changes done till this commit by invoking the rollback() method.Con.rollback()To commit a transactionRegister the driver using the registerDriver() method of the DriverManager class as −//Registering the Driver DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get the connection using the getConnection() method of the DriverManager class as −//Getting the connection String url = "jdbc:mysql://localhost/mydatabase"; Connection con = DriverManager.getConnection(url, "root", "password");Turn off the auto-commit using the setAutoCommit() method as −//Setting the auto commit false con.setAutoCommit(false);Commit the transaction using the commit() method as −con.commit();Let us create a table with ... Read More

In a database system, where more than one transaction is being executed simultaneously and in parallel, the property of isolation states that all the transactions will be carried out and executed as if it is the only transaction in the system. No transaction will affect the existence of any other transaction. Transaction Isolation Levels in Java Connection JDBC (Java Database Connectivity) provides support 5 transaction isolation levels through Connection interface. TRANSACTION_NONE: It is represented by integer value 0 does not support transactions. TRANSACTION_READ_COMMITTED: It is represented by integer value 2 supports ... Read More

In this article, we learn the Connection getTransactionIsolation() method in Java, which allows you to determine a database connection's current transaction isolation level. Transaction isolation levels dictate how transactions interact, particularly regarding data locking during reads or writes. What is the getTransactionIsolation() Method? The getTransactionIsolation() method is part of the Connection Interface in Java. It returns an integer constant representing the current isolation level of the database connection. JDBC provides support for 5 transaction isolation levels through the Connection interface − TRANSACTION_NONE: It is represented by an integer value 0 and does not support transactions. ... Read More