Chat2DB is a free, cross-platform, local-first database client and SQL workspace for developers, DBAs, analysts, and data teams. Connect to 40+ databases, manage data, edit and run SQL, and use your own AI model to generate, explain, and optimize queries. Available on desktop, web, Docker, and CLI, with MCP support.
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Redisson: Valkey & Redis Java Client and Real-Time Data Platform. Sync/Async/RxJava/Reactive API. Extends Valkey and Redis with over 60 objects and services: Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Spring, Tomcat, Scheduler, JCache API, Hibernate, RPC, local cache..
- java
- redis
- lock
- map
QuestDB is a high performance, open-source, time-series database
- time-series
- low-latency
- database
- sql
The official home of the Presto distributed SQL query engine for big data
- java
- presto
- hive
- hadoop
Apache Doris is a real-time analytics and hybrid search database for AI agents.
- olap
- database
- hudi
- iceberg
Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)
- java
- presto
- hive
- hadoop
Apache ZooKeeper
- zookeeper
- database
- hacktoberfest
- java
The world's fastest open query engine for sub-second analytics both on and off the data lakehouse. With the flexibility to support nearly any scenario, StarRocks provides best-in-class performance for multi-dimensional analytics, real-time analytics, and ad-hoc queries. A Linux Foundation project.
A library for debugging android databases and shared preferences - Make Debugging Great Again
Use SQL to query Elasticsearch
jOOQ is the best way to write SQL in Java
- jooq
- java
- sql
- jpa
MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
OrientDB is the most versatile DBMS supporting Graph, Document, Reactive, Full-Text and Geospatial models in one Multi-Model product. OrientDB can run distributed (Multi-Master), supports SQL, ACID Transactions, Full-Text indexing and Reactive Queries.
- orientdb
- graph-database
- document-database
- dbms
Unified Queries for Java
TranslatedParking lot system source code, new energy charging pile system, parking lot mini program, smart parking, Parking system. [Feature introduction]: ① Compatible with many mainstream cameras on the market; in theory compatible with all hardware, and flexibly extensible. ② After a camera recognizes a plate, the data is automatically uploaded to the cloud and recorded; the camera's unique id and hardware serial number are verified to prevent illegal data entry. ③ Users can check parking record details on their phones and pay fees themselves (supports WeChat, Alipay, and bank interface payment; each parking lot can be assigned a different merchant to collect payments). After payment, the barrier gate lifts automatically on exit within the free time. ④ Supports searching for nearby parking lots in the app (navigation, number of available spaces, parking fees, coupons, ratings, reviews, etc.), and parking spaces can be reserved. ⑤ During a power outage or network outage, booth attendants can use the app to take over the hardware and enter parking records. [Technical architecture]: The backend is developed in Java, with the frameworks oauth2 + springboot2 + dubble (Dubbo); databases are mysql/mongodb/redis; the underlying instant messaging framework is netty4; Android and iOS are both developed natively; the admin backend template is a professionally customized vue one.
CrateDB is a distributed and scalable SQL database for storing and analyzing massive amounts of data in near real-time, even with complex queries. It is PostgreSQL-compatible, and based on Lucene.
TranslatedJava open-source e-commerce mall system, a B2B2C multi-merchant mall source code based on Spring Boot / Spring Cloud / Vue / Uniapp, supporting mini program malls, microservices, distribution, live streaming, flash sales, and Docker private deployment.
requery - modern SQL based query & persistence for Java / Kotlin / Android
- sql
- persistence
- java
- kotlin
Replicate your Key Value Store across your network, with consistency, persistance and performance.
Ultra-fast SQL-like queries on Java collections
Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.
- embedded-database
- java
- kotlin
- key-value
SirixDB is an an embeddable, bitemporal, append-only database system and event store, storing immutable lightweight snapshots. It keeps the full history of each resource. Every commit stores a space-efficient snapshot through structural sharing. It is log-structured and never overwrites data. SirixDB uses a novel page-level versioning approach.
- xquery
- java
- temporal-data
- storage
LINQ-style queries for Java 8
A distributed system designed to ingest and process time series data