ResultSetMetaData

Introduction#

As we all know Metadata mean data about data.

To fetch metadata of a table like total number of column, column name, column type etc. , ResultSetMetaData interface is useful because it provides methods to get metadata from the ResultSet object.

ResultSetMetaData

import java.sql.*;

class Rsmd {

    public static void main(String args[]) {
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            Connection con = DriverManager.getConnection(
                    "jdbc:oracle:thin:@localhost:1521:xe", "system", "oracle");

            PreparedStatement ps = con.prepareStatement("select * from emp");
            ResultSet rs = ps.executeQuery();
            ResultSetMetaData rsmd = rs.getMetaData();

            System.out.println("Total columns: " + rsmd.getColumnCount());
            System.out.println("Column Name of 1st column: " + rsmd.getColumnName(1));
            System.out.println("Column Type Name of 1st column: " + rsmd.getColumnTypeName(1));

            con.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}