The Jdbi library provides convenient, idiomatic access to relational databases in Java. Jdbi is built on top of JDBC. If your database has a JDBC driver, you can use Jdbi with it. It uses the Java collections framework for query results, provides a convenient means of externalizing sql statements, and provides named parameter support for any database being used. 

jDBI - Provides convenient tabular data access in Java

SQLite JDBC is a library for accessing and creating SQLite database files in Java. The library requires no configuration since native libraries for major OSs, including Windows, Mac OS X, Linux etc., are assembled into a single JAR (Java Archive) file. 

Sqlite JDBC - SQLite JDBC Driver

MySQL provides connectivity for client applications developed in the Java programming language with MySQL Connector/J, a driver that implements the Java Database Connectivity (JDBC) API and also MySQL X DevAPI. MySQL Connector/J 8.0 is a JDBC Type 4 driver that is compatible with the JDBC 4.2 specification. The Type 4 designation means that the driver is a pure Java implementation of the MySQL protocol and does not rely on the MySQL client libraries.

MySQL Connector/J - Driver that implements the Java Database Connectivity (JDBC) API and also MySQL X DevAPI

PostgreSQL JDBC Driver (PgJDBC for short) allows Java programs to connect to a PostgreSQL database using standard, database independent Java code. It is an open source JDBC driver written in Pure Java (Type 4), and communicates in the PostgreSQL native network protocol.

PgJDBC - Postgresql JDBC Driver

Trino is a highly parallel and distributed query engine, that is built from the ground up for efficient, low latency analytics. It is an ANSI SQL compliant query engine, that works with BI tools such as R, Tableau, Power BI, Superset and many others. It helps to natively query data in Hadoop, S3, Cassandra, MySQL, and many others, without the need for complex, slow, and error-prone processes for copying the data. 
 
Access data from multiple systems within a single query. For example, join historic log data stored in an S3 object storage with customer data stored in a MySQL relational database.

Trino is a highly parallel and distributed query engine, that is built from the ground up for efficient, low latency analytics. It is an ANSI SQL compliant query engine, that works with BI tools such as R, Tableau, Power BI, Superset and many others. It helps to natively query data in Hadoop, S3, Cassandra, MySQL, and many others, without the need for complex, slow, and error-prone processes for copying the data. 

Trino - A query engine that runs at ludicrous speed

Ebean is fast and simple data access on the JVM. With Ebean it is very easy to insert, update, delete. There is no Session or EntityManager to manage, no merge/flush/attach/detach semantics. Ebean can profile the object graph use and use that to automatically optimise ORM queries such that they only fetch the required properties and minimises N + 1. 
 
Its features include JPA Mapping annotations, Type safe queries, ElasticSearch integration and lot more.

Ebean is fast and simple data access on the JVM.  With Ebean it is very easy to insert, update, delete. There is no Session or EntityManager to manage, no merge/flush/attach/detach semantics.  Ebean can profile the object graph use and use that to automatically optimise ORM queries such that they only fetch the required properties and minimises N + 1. 

Ebean - ORM for Java / Kotlin

IronJacamar is an implementation of the Java EE Connector Architecture 1.7 specification. Java EE Connector Architecture defines a contract for how so-called Enterprise Information Systems  integrate with the Java Enterprise Edition Platform. Enterprise Information Systems include databases, messaging systems, and other servers/systems external to an application server.


IronJacamar - Java Connector

doobie is a pure functional JDBC layer for Scala. It is not an ORM, nor is it a relational algebra; it just provides a principled way to construct programs (and higher-level libraries) that use JDBC. doobie introduces very few new abstractions; if you are familiar with basic scalaz typeclasses like Functor and Monad you should have no trouble here.

doobie -  principled database access for scala

ScalikeJDBC is a tidy SQL-based DB access library for Scala developers. This library naturally wraps JDBC APIs and provides you easy-to-use and very flexible APIs. What’s more, QueryDSL makes your code type-safe and reusable.

ScalikeJDBC - SQL-based DB access library for Scala developers

Fast and Easy mapping from database and CSV to POJO. It is a java micro ORM, lightweight alternative to iBatis and Hibernate. It supports Fast Csv Parser and Csv Mapper. 
 
SimpleFlatMapper provides a very fast and easy to use mapper for JDBC, CSV, Excel, Cassandra. It integrates with jOOQ, Spring Jdbc, JDBI ResultSetMapper and Binder, JDBI3, Sql2o and QueryDSL.

Fast and Easy mapping from database and CSV to POJO. It is a java micro ORM, lightweight alternative to iBatis and Hibernate. It supports Fast Csv Parser and Csv Mapper. 

SimpleFlatMapper - Fast and Easy mapping from database and CSV to POJO

Gimel provides unified Data API to access data from any storage like HDFS, GS, Alluxio, Hbase, Aerospike, BigQuery, Druid, Elastic, Teradata, Oracle, MySQL, etc.

Gimel - PayPal's Big Data Processing Framework

jcabi-jdbc is a lightweight wrapper of JDBC. It is very convenient to use when you don't need a full-scale ORM (like Hibernate), but want just to select, insert, or update a few rows in a relational database.

jcabi-jdbc - Fluent Wrapper of JDBC

log4jdbc is a Java JDBC driver that can log SQL and/or JDBC calls (and optionally SQL timing information) for other JDBC drivers using the Simple Logging Facade For Java (SLF4J) logging system. 

Log4jdbc - Java JDBC driver that can log SQL and/or JDBC calls

Eclipse JNoSQL is a Java framework that streamlines the integration of Java applications with NoSQL databases. It defines a set of APIs and provides a standard implementation for most NoSQL databases. This clearly helps to achieve very low coupling with the underlying NoSQL technologies used in applications.
 
It provide a set of APIs that defines communication with NoSQL databases. Compared with traditional the RDBMS world, they are like the JDBC API. It contains four modules, one for each NoSQL database type: Key-Value, Column Family, Document, and Graph.

Eclipse JNoSQL is a Java framework that streamlines the integration of Java applications with NoSQL databases. It defines a set of APIs and provides a standard implementation for most NoSQL databases. This clearly helps to achieve very low coupling with the underlying NoSQL technologies used in applications.

Eclipse JNoSQL - Framework which has the goal to help Java developers to create Jakarta EE applications with NoSQL

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