GitHub - awslabs/rds-data-api-client-library-java (original) (raw)

RDS Data API Client Library for Java

The RDS Data API Client Library for Java provides an alternative way to use RDS Data API. Using this library, you can map your client-side classes to requests and responses of the Data API. This mapping support can ease integration with some specific Java types, such as Date, Time, and BigDecimal.

Getting the Java Client Library for RDS Data API

The Data API Java client library is open source in GitHub. You can build the library manually from the source files, but the best practice is to consume the library using Maven:

Version 2.x

Version 1.x (AWS SDK 1.x compatible)

Using the Client Library

Following, you can find some common examples of using the Data API Java client library. These examples assume that you have a table accounts with two columns: accountId and name. You also have the following data transfer object (DTO).

public class Account { int accountId; String name; // getters and setters omitted }

The client library enables you to pass DTOs as input parameters. The following example shows how customer DTOs are mapped to input parameters sets.

var account1 = new Account(1, "John"); var account2 = new Account(2, "Mary"); client.forSql("INSERT INTO accounts(accountId, name) VALUES(:accountId, :name)") .withParamSets(account1, account2) .execute();

In some cases, it's easier to work with simple values as input parameters. You can do so with the following syntax.

client.forSql("INSERT INTO accounts(accountId, name) VALUES(:accountId, :name)") .withParameter("accountId", 3) .withParameter("name", "Karen") .execute();

The following is another example that works with simple values as input parameters.

client.forSql("INSERT INTO accounts(accountId, name) VALUES(?, ?)", 4, "Peter") .execute();

The client library provides automatic mapping to DTOs when an execution result is returned. The following examples show how the execution result is mapped to your DTOs.

List result = client.forSql("SELECT * FROM accounts") .execute() .mapToList(Account.class);

Account result = client.forSql("SELECT * FROM accounts WHERE account_id = 1") .execute() .mapToSingle(Account.class);

In many cases, the database result set contains only a single value. In order to simplify retrieving such results, the client library offers the following API:

int numberOfAccounts = client.forSql("SELECT COUNT(*) FROM accounts") .execute() .singleValue(Integer.class);