29. Working with SQL databases

29. Working with SQL databases

Production database connections can also be auto-configured using a pooling DataSource. Here's the algorithm for choosing a specific implementation:

• We prefer the Tomcat pooling DataSource for its performance and concurrency, so if that is available we always choose it.
• Otherwise, if HikariCP is available we will use it.
• If neither the Tomcat pooling datasource nor HikariCP are available and if Commons DBCP is available we will use it, but we don't recommend it in production.
• Lastly, if Commons DBCP2 is available we will use it.

If you use the spring-boot-starter-jdbc or spring-boot-starter-data-jpa 'starters' you will automatically get a dependency to tomcat-jdbc.

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