The JDBC ResultSet doesn’t provide any isEmpty(), length() or size() method to check if its empty or not. Hence, when a Java programmer needs to determine if ResultSet is empty or not, it just calls the next() method and if next() returns false it means ResultSet is empty.

The isAfterLast() method of the ResultSet interface is used to determine whether the cursor is on the last row of the ResultSet. rs. isLast(); This method returns an boolean this value is true, if the cursor is on the last row of the ResultSet else, it returns false.

You can move the cursor of the ResultSet object to the last row from the current position, using the last() method of the ResultSet interface. This method returns a boolean value specifying whether the cursor has been moved to the last row successfully.

Procedure

1. Invoke the Connection. createStatement method to create a Statement object.
2. Invoke the Statement.
3. In a loop, position the cursor using the next method, and retrieve data from each column of the current row of the ResultSet object using getXXX methods.
4. Invoke the ResultSet.
5. Invoke the Statement.

Getting the number of rows using methods The last() method of the ResultSet interface moves the cursor to the last row of the ResultSet and, the getRow() method returns the index/position of the current row.

The wasNull() method of the ResultSet interface determines whether the last column read had a Null value. i.e. whenever you read the contents of a column of the ResultSet using the getter methods (getInt(), getString etc…) you can determine whether it (column) contains null values, using the wasNull() method.

Here are the keyboard shortcuts that you need: Ctrl-Down — The shortcut moves the cursor to the last row with data before the first blank row that is encountered; this may be the last row in the table ideally, but only if there are not any blank rows in the table.

14 Keyboard Shortcuts for Moving the Cell Cursor in Excel

Simply iterate on ResultSet object and increment rowCount to obtain size of ResultSet object in java. rowCount = rs. getRow();

A ResultSet is a Java object that contains the results of executing an SQL query. In other words, it contains the rows that satisfy the conditions of the query. The data stored in a ResultSet object is retrieved through a set of get methods that allows access to the various columns of the current row.

For each row returned by a query, the ROWNUM pseudocolumn returns a number indicating the order in which Oracle selects the row from a table or set of joined rows. The first row selected has a ROWNUM of 1, the second has 2, and so on. The results can vary depending on the way the rows are accessed.

This isFirst method is specified by the isFirst method in the java. sql. ResultSet interface. If this method is used with forward and dynamic cursors, an exception is thrown.

The ResultSetinterface provides gettermethods (getBoolean, getLong, and so on) for retrieving column values from the current row. Values can be retrieved using either the index number of the column or the name of the column. In general, using the column index will be more efficient. Columns are numbered from 1.

A ResultSet object maintains a cursor pointing to its current row of data. Initially the cursor is positioned before the first row. The next method moves the cursor to the next row, and because it returns false when there are no more rows in the ResultSet object, it can be used in a while loop to iterate through the result set.

A default ResultSet object is not updatable and has a cursor that moves forward only. Thus, you can iterate through it only once and only from the first row to the last row. It is possible to produce ResultSet objects that are scrollable and/or updatable.

If your result returns just one record, then you are behind the end of the ResultSet, and you will get an error if you ask rows.getInt (“id”). If you only need the first record, then remove the second ‘rows.next ()’.