Spring+jdbc combination
Configure data sources, transactions. There are two basic ways to configure transactions: annotation-based and xml configuration. The data source defaults to singleton mode when it is configured .
Configure the data source
Or configure the properties file
Spring files can use placeholders directly
Annotation transaction 
detailed xml configuration
get data source
Create a class that implements the business interface and inject the data source. Then hand over this class to spring for management. 
Manipulate jdbcTemplate
Write a query to receive a class personRowMapper
The class is annotated with @Transactional
