How can you tell if a record is last ResultSet?
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How can you tell if a record is last ResultSet?
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.
How do you find the values of a ResultSet?
The “check for any results” call ResultSet. next() moves the cursor to the first row, so use the do {…} while() syntax to process that row while continuing to process remaining rows returned by the loop. This way you get to check for any results, while at the same time also processing any results returned.
What is use of isFirst () method?
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.
What is beforeFirst () in Java?
The beforeFirst() method of the ResultSet interface moves the pointer of the current (ResultSet) object to the default position (before first), from the current position.
What is the use of wasNull () in ResultSet interface?
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.
Is NULL or empty SQL?
NULL is used in SQL to indicate that a value doesn’t exist in the database. It’s not to be confused with an empty string or a zero value. While NULL indicates the absence of a value, the empty string and zero both represent actual values.
How do you determine the size of a ResultSet?
Simply iterate on ResultSet object and increment rowCount to obtain size of ResultSet object in java. rowCount = rs. getRow();
Is not null or empty Java?
Using the isEmpty() Method The isEmpty() method returns true or false depending on whether or not our string contains any text. It’s easily chainable with a string == null check, and can even differentiate between blank and empty strings: String string = “Hello there”; if (string == null || string. isEmpty() || string.
