====== Spring Using DataSource or JdbcTemplate ======
===== DataSource =====
Simply do 
<code>
    @Autowired
    DataSource dataSource;
</code>
and we can use the dataSource in our code like:
<code>
   String sql = "YOUR_SQL_QUERY"; //such as "UPDATE Book  SET NAME = '" + String.valueOf(iRandom) + "' WHERE ID = 1"
   Connection connection = dataSource.getConnection();
   Statement statement = connection.createStatement();
   int iAffectedRowCount = statement.executeUpdate(sql);
   connection.close();
</code>
of course, you need to do a try catch yourself.

===== JdbcTemplate =====
Likewise Spring also provided the JDBC template, all we need to do is:
<code>
    @Autowired
    JdbcTemplate jdbcTemplate;
</code>
and we can use it like:
<code>
   String sql = "YOUR_SQL_QUERY"; //such as "UPDATE Book  SET NAME = '" + String.valueOf(iRandom) + "' WHERE ID = 1"
   int iAffectedRowCount  = jdbcTemplate.update(sql);
</code>
of course, you need to do a try catch yourself. For more detail on how to use JdbcTemplate, go to the reference https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/jdbc/core/JdbcTemplate.html