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The process of retrieving data from a database using Java Database Connectivity (JDBC) is a foundational skill for Java developers. It involves a structured sequence of steps to establish a connection, execute a query, and handle the resulting data through a specific object known as the ResultSet .

In summary, fetching data via JDBC is a systematic process of executing SQL, navigating a cursor-based result set, and mapping database columns to Java variables. Mastering this flow allows developers to build robust, data-driven applications that can interact seamlessly with relational databases. Download What Result Set jdbc How fetch data (720P HD) mp4

Efficiency and resource management are critical when fetching data. Since database connections and result sets consume system memory and network resources, it is a best practice to close these objects once the data processing is complete. Modern Java development often utilizes the try-with-resources statement to ensure that the ResultSet , Statement , and Connection are automatically closed, even if an exception occurs during the fetch process. The process of retrieving data from a database

To begin, a developer must establish a connection to the database using the DriverManager class. Once connected, a Statement or PreparedStatement object is created to send SQL queries to the database. For data retrieval, the executeQuery() method is used. This method returns a ResultSet object, which acts as a logical table containing the data produced by the query. Mastering this flow allows developers to build robust,

The ResultSet maintains a cursor that points to the current row of data. Initially, this cursor is positioned before the first row. To access the data, developers typically use a while loop combined with the next() method. Each call to next() moves the cursor forward by one row and returns a boolean value indicating whether a row exists at that new position. Inside the loop, specific getter methods—such as getString() , getInt() , or getDouble() —are used to extract values from individual columns by providing either the column name or its index.