java Java - JDBC - preparedStatement

Posted 2021-05-08

public void preparedStatement() throws SQLException {
		
		Connection conn = null;
		PreparedStatement pstmnt = null;
		ResultSet rs = null;
		
		try {
									
			String sql = "Select Code, Name, Continent, Region, Population from Country where Continent = ? and Population >= ? order by Population Desc";
			String format = "%-6s%-25s%-12s%-20s%-20s\n";
			
			conn = DB_Util.getConn(DB_Types.MYSQLDB);
			pstmnt = conn.prepareStatement(sql, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);			
			pstmnt.setString(1, "Europe");
			pstmnt.setInt(2, 1500000);						
			rs = pstmnt.executeQuery();
			
			System.out.format(format, "Code", "Name", "Continent", "Region", "Population");
			System.out.println("-------------------------------------------------------------------------");
			
			while(rs.next()) {
				
				System.out.format(format, rs.getString("Code"), rs.getString("Name"),rs.getString("Continent"),rs.getString("Region"),rs.getInt("Population"));
			}
			
			rs.last();
			
			System.out.println("Total Countries: " + rs.getRow());			
		}
		
		catch(SQLException e) {
			
			DB_Util.getErrorMessage(e);			
		}
	}