DDAL
DDAL(Distributed Data Access Layer) is a simple solution to access database shard.
License
DDAL is dual licensed under LGPL V2.1 and Apache Software License, Version 2.0.
Quick start
- add the following dependency in your pom.xml
<dependency>
<groupId>org.hellojavaer.ddal</groupId>
<artifactId>ddal-datasource</artifactId>
<version>1.1.1-RELEASE</version>
</dependency>- use DefaultDDALDataSource to proxy the orginal dataSource
<bean name="dataSource" class="org.hellojavaer.ddal.datasource.DefaultDDALDataSource">
<constructor-arg index="0" value="jdbc:ddal:thick:classpath:/datasource.xml"/>
<!-- <constructor-arg index="0" value="jdbc:ddal:thick:http://{host}:{port}/{appName}"/> -->
</bean>
-
see datasource.xml
-
see a full example
Features
- Only need to proxy the original datasources for business
- Fully support ACID
- Support insert, select, update and delete expression
- Support join(inner join,left join,right join,full jion), sub-select, union all and exists expression
- Support table alias
- Support no shard-key schema/table routing
- Support '=', in' and 'between' operation to route schema/table and support mixed sql parameter and jdbc parameter in routing values
- eg: 'select * from tb where id in(1,?,3)'
- eg: 'select * from tb where id between 1 and ?'
- Support Date, Timestamp, Byte, Short, Integer, Long, String, Character, Hex value type for shard-value
- Support annotation routing
- Support custom route rule (eg: '{scName}_{format('%02d', sdValue % 4)}')
- Support route rule binding on a schema (instead of a table)
- Support scan all schemas and tables
- Support limit check
- Support read-write splitting
- Support load balance of read
- Support config at server-side
- Support db cluster route
- Provide multiple sequence implements
Download
http://repo1.maven.org/maven2/org/hellojavaer/ddal/
Documentation
Release Notes
Extensions in the latest version 1.1.0-RELEASE
- support DB cluster route
- enhance ShardRouteUtils
Extensions in version 1.0.1-RELEASE
- Support route rule binding on a schema (instead of a table)
<bean class="org.hellojavaer.ddal.ddr.shard.simple.SimpleShardRouteRuleBinding">
<property name="scName" value="base"/>
<property name="rule">
<bean class="org.hellojavaer.ddal.ddr.shard.rule.SpelShardRouteRule">
<property name="scRouteRule" value="{scName}_{format('%02d', sdValue % 2)}"/>
<property name="tbRouteRule" value="{tbName}_{format('%04d', sdValue % 8)}"/>
</bean>
</property>
<property name="sdKey" value="id"/>
<property name="sdValues" value="[0..7]"/>
</bean>
Extensions in version 1.0.0-RELEASE
- upgrade jsqlparser's version to 1.2 to support more sql features
- optimize JSQLParserAdapter
Extensions in version 1.0.0.M7
- support custom protocol jdbc:ddal:
Extensions in version 1.0.0.M6
- implement DefaultDDALDataSource in ddal-datasource module
<bean name="dataSource" class="org.hellojavaer.ddal.datasource.DefaultDDALDataSource">
<constructor-arg index="0" value="jdbc:ddal:thick:classpath:/datasource.xml"/>
</bean>
- implement DivideShardRouteRule for range route
Extensions in version 1.0.0.M5
- optimize route rule expression parser
// older
SpelShardRouteRule rule = new SpelShardRouteRule();
rule.setScRouteRule("{#scName}_{#format('%02d', #sdValue % 4)}");
rule.setTbRouteRule("{#tbName}_{#format('%04d', #sdValue % 8)}");
// newer
SpelShardRouteRule rule = new SpelShardRouteRule();
rule.setScRouteRule("{scName}_{format('%02d', sdValue % 4)}");
rule.setTbRouteRule("{tbName}_{format('%04d', sdValue % 8)}");
- optimize range expression parser
"1,2,3" => 1,2,3
"[1..3]" => 1,2,3
"['A'..'C','X']" => A,B,C,X
"[0..1][0..1]" => 00,01,10,11
"Hi![' Allen',' Bob']" => Hi! Allen,Hi! Bob