Document how to use Spring JdbcTemplate, with multi-language examples.

[wetted]

close #2423

[sdelamo]

can the JdbcTemplate be injected directly without the need of instantiating it manually?

[wetted]

No, that didn't work for me, and even in that case it did, it still needs a DataSource set before you can use it. I patterned this after what is done in: https://github.com/micronaut-projects/micronaut-data/blob/master/data-spring-jdbc/src/main/java/io/micronaut/data/spring/jdbc/SpringJdbcConnectionOperations.java

[wetted]

I suppose we could create a factory that does the same thing, and then it could be injected.

[sdelamo]

ping @dstepanov

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[radovanradic]

@sdelamo Looks like these doc-examples/jdbc-spring-template-xxx are failing
https://ge.micronaut.io/s/sznpcbjjr6po2

Failed to inject value for parameter [transactionManager] of class: io.micronaut.transaction.test.DefaultTestTransactionExecutionListener
Message: Multiple possible bean candidates found: [SpringJdbcTransactionOperations, DataSourceTransactionManager]

[wetted]

@sdelamo Looks like these doc-examples/jdbc-spring-template-xxx are failing https://ge.micronaut.io/s/sznpcbjjr6po2

Failed to inject value for parameter [transactionManager] of class: io.micronaut.transaction.test.DefaultTestTransactionExecutionListener
Message: Multiple possible bean candidates found: [SpringJdbcTransactionOperations, DataSourceTransactionManager]

@radovanradic Is this repeatable for you? I just ran the check task locally on master and the tests pass for me.

[radovanradic]

@wetted Not anymore it seems. Was getting it today on 4.1.x consistently. Maybe didn't pick up Sergio's merge. Seems to be working fine now. Sorry for false alarm.