SaaShard是一款针对SaaS系统设计的数据库分片和读写分离方案。
SaaS系统，具有租户的概念，每个租户间的数据是独立的。基于这个特点，可以通过租户字段进行水平拆分（Sharding）数据库。这样，每个特定租户的SQL执行，都只会定位到单个数据库，这也就保证了可以尽量保留单库查询的能力。
目前只考虑MySQL的实现，并且现阶段只实现按DB分片。
go get github.com/berkaroad/saashard
cd $GOPATH/src/github.com/berkaroad/saashard
http://github.com/berkaroad/saashard-binary
https://github.com/berkaroad/docker-images/tree/master/saashard
make # compile in current platform
make build-all # compile in windows, linux and darwin platform.
make test # just for test
make dev # Run immediately, use dev.yaml config file.
make run # Run immediately, use ss.yaml config file.
- Support multi-query and multi-result.
- Support transaction.
- Support hint /*!saashard master */ to force execute on master.
- Support hint /*!saashard nodes=node1,node2 */ to force specify node list in DDL statement.
- Support split read and write. (Read balance use polling algorithm.)
- Support database sharding, supported algorithm is 'hash', 'mod'.
- Support backend connection pool.
- Support Stmt related command.(developing)
- MySQL Workbench
- SQLyog
- ado.net
- entity framework (EF6)
- simple query, join query, sub query is supported.
- DML statement
- DDL that only support table struct and index.
- VIEW is not supported, because it couldn't get shard key's value from those.
- maintain FUNCTION, PROCEDURE or TRIGGER is not supported.
/* Not supported, but you can replace it to above */
select (case t1.f1 when '0' then 'hello' else 'world' end) f1 from t1;
/* This is supported */
select (case when t1.f1='0' then 'hello' else 'world' end) f1 from t1;
/* Not supported, because this is dml statement, and couldn't get shard key's value. */
select f1,f2,f3 into t2 from t1
- QQ Group: SaaShard 487761803