https://github.com/greendelta/olca-h2

Implementation of the openLCA IDatabase interface with an H2 in-memory database
https://github.com/greendelta/olca-h2

Last synced: 7 days ago
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Implementation of the openLCA IDatabase interface with an H2 in-memory database

• Host: GitHub
• URL: https://github.com/greendelta/olca-h2
• Owner: GreenDelta
• License: mpl-2.0
• Created: 2018-03-05T16:13:30.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2018-03-09T12:03:48.000Z (almost 7 years ago)
• Last Synced: 2024-04-16T19:12:38.464Z (8 months ago)
• Language: Java
• Homepage:
• Size: 21.5 KB
• Stars: 0
• Watchers: 5
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# olca-h2

`olca-h2` provides an implementation of the openLCA `IDatabase` interface using

an in-memory instance of an [H2](http://www.h2database.com) database. The import

into `olca-h2` is ~twice as fast compared to an import into a file based Derby

database in openLCA (on a modern SSD drive). Additionally, you can dump such

an `olca-h2` database to a file and reload it into memory later (see below). 

## Usage

Install the [openLCA core modules](https://github.com/GreenDelta/olca-modules)

and this project via [Maven](https://maven.apache.org/) (you may have to check

the version of the dependencies):

```bash

git clone 

cd olca-h2  # check the version in the pom.xml

mvn install

``` 

After this you can use `olca-h2` e.g. as plain Maven dependency:

```xml

...

    1.7.0

...

    

        org.openlca

        olca-core

        ${olca.version}

        

            

            

                org.apache.derby

                derby

                

            

    

    

        org.openlca

        olca-h2

        ${olca.version}

    

```

#### Create an empty database

```java

import org.openlca.core.database.IDatabase;

import org.openlca.h2.DB;

IDatabase db = DB.empty();

// use it like a standard openLCA database

```

#### Dump a database and reload it

```java

import org.openlca.h2.DB;

DB db = DB.empty();

// import data ...

db.dump("dump.gz");

DB db2 = DB.fromDump("dump.gz");

```

## Updating

`olca-h2` has its own `schema.sql` and `persistence.xml` files. So if there

are database schema or model updates in openLCA these files need to be checked.

The persistence unit is configured to directly take a

[HikariCP](https://github.com/brettwooldridge/HikariCP) connection pool (

`transaction-type="JTA"`)