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

• Documentation Home
• Frequently Asked Questions

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