Question

Assume that a valid Resultset object exists, populated with data. What method do you call to retrieve column 3 as a string? What do you pass as an argument to the method?

Short answer

Answer: You can retrieve the value from column 3 as a string using the getString() method on the ResultSet object and passing the integer 3 as an argument. For example: ```java String column3Value = resultSet.getString(3); ``` In this code snippet, "resultSet" represents the existing ResultSet object, and "column3Value" is the variable where the retrieved value will be stored.

Step-by-step solution

Understand the ResultSet object

The ResultSet object is a Java interface used to represent a database result set, usually obtained from executing a statement that queries the database. The ResultSet interface provides methods to retrieve and manipulate the data stored within it.

Identify the method to retrieve data from ResultSet

In order to fetch data from a specific column in a ResultSet object, we need to utilize the "getString()" method. The getString() method accepts an integer parameter that corresponds to the column index, starting from 1.

Retrieve the value from column 3 as a string

To retrieve the value from column 3 as a string, we will call the getString() method on the ResultSet object and pass the integer 3 as an argument. The code snippet for doing this is: ```java String column3Value = resultSet.getString(3); ``` In this snippet, "resultSet" denotes the existing ResultSet object, while "column3Value" is the variable where the retrieved value will be stored.