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    Squeryl Home Learn more Scaladoc Community Follow _squeryl on TwitterTwitter A Scala ORM and DSL for talking with Databases with minimum verbosity and maximum type safety Write compiler validated statements. Squeryl statements that pass compilation won’t fail at runtime. Refactor your schema as often as is required, the Scala compiler and your IDE will tell you exactly which lines of code are affected. Never repeat yourself The Composability of Squeryl statements allows you to define them once and reuse them as sub queries within other statements. Write declaratively Write as declaratively as SQL, only with less boilerplate. SQL’s declarativeness is preserved, not encapsulated in a lower level API that requires imperative and procedural code to get things done. Explicitly control retrieval granularity and laziness A significant part of optimizing a database abstraction layer is to choose for every situation the right balance between fine and large grained retrieval, and the optimal mix of laziness and eagerness. Data retrieval strategies are explicit in Squeryl rather than driven by configuration like current generation Java ORMs read more
    7 years ago by @gresch
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    Sausalito is a product that enables you to develop, test, deploy, and host scalable web applications in the cloud. On this page, you find some reading material in case you're interested in * technical details about Sausalito, * user experience reports, or * presentations and demos that we gave.
    8 years ago by @gresch
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    FlockDB is a distributed graph database for storing adjancency lists, with goals of supporting: * a high rate of add/update/remove operations * potientially complex set arithmetic queries * paging through query result sets containing millions of entries * ability to "archive" and later restore archived edges * horizontal scaling including replication * online data migration Non-goals include: * multi-hop queries (or graph-walking queries) * automatic shard migrations FlockDB is much simpler than other graph databases such as neo4j because it tries to solve fewer problems. It scales horizontally and is designed for on-line, low-latency, high throughput environments such as web-sites. Twitter uses FlockDB to store social graphs (who follows whom, who blocks whom) and secondary indices. As of April 2010, the Twitter FlockDB cluster stores 13+ billion edges and sustains peak traffic of 20k writes/second and 100k reads/second.
    8 years ago by @gresch
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    SYMPLiK EXZELLENZ is a Java program to manipulate table data in Oracle database by using Microsoft Excel file. Unlike Oracle WebADI, More4Apps or other Excel-driven solution, this program does not use Office VBA (Macro) to process the data. It is a pure Java solution incorporated with Apache POI and Oracle JDBC driver to download, upload, insert, update and delete data from Oracle database tables.
    8 years ago by @gresch
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    Sqoop is a tool designed to import data from relational databases into Hadoop. Sqoop uses JDBC to connect to a database. It examines each table’s schema and automatically generates the necessary classes to import data into the Hadoop Distributed File System (HDFS). Sqoop then creates and launches a MapReduce job to read tables from the database via DBInputFormat, the JDBC-based InputFormat. Tables are read into a set of files in HDFS. Sqoop supports both SequenceFile and text-based target and includes performance enhancements for loading data from MySQL.
    8 years ago by @gresch
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    AutoPatch was born from the needs of using an agile development process while working on systems that have persistent storage. Without AutoPatch, developers usually can't afford the maintenance headache of their own database, and DBAs are required just to apply changes to all of the various environments a serious development effort requires. The very application of database changes becomes an inefficient, error-prone, expensive process, all conspiring to discourage any refactoring that touches the model, or being a bottleneck when model changes are made. AutoPatch solves this problem, completely. With AutoPatch, an agile development process that requires a database change looks like this: * Developer alters the model, which requires a change to the database * Developer possibly consults a DBA, and develops a SQL patch against their personal database that implements the alteration * Developer commits the patch to source control at the same time as they commit their dependent code * Other developers' and environments' databases are automatically updated by AutoPatch the next time the new source is run This represents streamlined environment maintenance, allowing developers to cheaply have their own databases and all databases to stay in synch with massively lower costs and no environment skew. That's what AutoPatch does. Clusters with one database? Multiple schemas? Logical migrations, instead of just DDL changes? Need to do something special/custom? Need to distribute your changes commercially? All without paying anything? No problem.
    8 years ago by @gresch
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    Inventor of a "sonesGraphDB" storage system which seems to be extremely powerful.
    9 years ago by @gresch
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    Very interesting approach! "Apache Empire-db is an Open Source relational data persistence component which allows database vendor independent dynamic query definition as well as safe and simple data retrieval and updating. Compared to most other solutions like e.g. Hibernate, TopLink, iBATIS or JPA implementations, Empire-db takes a considerably different approach, with a special focus on compile-time safety, reduced redundancies and improved developer productivity."
    9 years ago by @gresch
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    Das Problem … PHP-Scripte werden nach einer bestimmten Laufzeit abgebrochen (normalerweise nach 30 Sekunden), und so funktioniert ein Backup mit diversen Tools nur bis zu einer bestimmten Größe. Braucht das Script länger als die 30 Sekunden, so wird es vom Server einfach abgebrochen, und man kommt nicht mehr an sein Backup heran. Gleiches gilt für das Wiedereinspielen eines Backups. Wer einmal ein Dumpfile von Hand in viele kleinere Einzelabschnitte zerlegt hat, um eine Datenbank wieder herzustellen, der weiß genau, wovon wir reden. MySQLDumper ist die Lösung … MySQLDumper umgeht den Timeout-Error mit Hilfe eines kleinen Tricks: Er liest nur eine bestimmte Anzahl von Datensätzen aus der Tabelle aus, merkt sich, wie weit er gekommen ist, und ruft sich anschließend selbst auf. Dadurch erhält das Script bei jedem Aufruf wieder die vollen 30 Sekunden und umgeht so den Timeout-Error. Das gleiche Prinzip benutzt MySQLDumper auch beim Wiederherstellen der Daten. MySQLDumper kann die Daten beim Sichern sofort packen. Auch das Wiederherstellungsscript kann direkt aus dieser gepackten Datei lesen, ohne dass sie auf dem Server entpackt werden muss! Natürlich kann man die Datei auch ungepackt lassen, aber spätestens beim Hochladen eines Backups weiß man dies zu schätzen.
    9 years ago by @gresch
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    DbFit is a set of FIT fixtures which enables FIT/FitNesse tests to execute directly against a database. This enables developers to manipulate database objects in a relational tabular form, making database testing and management much easier then with xUnit-style tools. The library is free to use, released under GNU GPL.
    9 years ago by @gresch
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    Spring, JPA, and JTA with Hibernate and JOTM 2007-04-24 20:35 have been struggling for a couple of hours today to modify a Spring JPA configuration with a single datasource, Hibernate as the JPA provider and the JpaTransactionManager to a configuration with two XA datasources, Hibernate as the JPA provider, and the JtaTransactionManager with JOTM as the standalone JTA provider. since the Spring and Hibernate reference manual and Javadoc documentation merely contain a number of hints on how to configure JPA with a JTA transaction manager and others are struggling as well i decided to post how i finally got it to work.
    9 years ago by @gresch
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    Using a Hibernate Interceptor To Set Audit Trail Properties
    9 years ago by @gresch
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    With the addition of generics in Java 5, writing a custom DAO for each domain object is no longer required. There are a wide variety of articles on creating generic DAOs, but my current project uses the approach from this IBM DeveloperWorks article. This approach was choses mainly because of the clearly written article and the integration with Spring. You should be able to extend any generic DAO based on Spring to implement the stored procedure configuration.
    9 years ago by @gresch
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    The agimatec tools contain some utilities to enable generation of files, source code etc. from sql files and annotated java classes. The agimatec-dbmigrate tool is a database migration/script execution framework that can execute sql scripts, groovy scripts and provides a lot of features to assist in database schema migration. (tested with Oracle and Postgres)
    9 years ago by @gresch
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    Hattori is a Java framework that simplifies Data Transfer Object population in n-tier web applications by using Java 5 annotations. The framework is meant to be used at service layer and presentation layer. Given a domain object graph, a DTO object model subset is populated by Hattori which becomes available for modification which will could be later taken to the original domain object graph. Normally, the DTOs are populated at the service layer and sent to the presentation layer for that modification. The population process is done by evaluating each Data Transfer Object annotated with the ObjectPopulation annotation, identifying operations to be executed on each one using one of these options: implicit rules, annotation rules or your own specific per-object defined java code.
    9 years ago by @gresch
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    About AutoDAO is a Generic DAO on steroids implementation for Java. This project was inspired by Don't repeat the DAO! article by Per Mellqvist. Main features * Ready to use CRUD operations * Zero persistence code for common DAO queries * Annotation-driven auto-configuration * Spring Framework custom namespace for easy to use configuration * Hibernate/JPA support
    9 years ago by @gresch
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    What does it do? Given an accessible database schema, the Hibernate POJO Generator produces all the Java code necessary to access each field in each table via the Hibernate persistence framework. Additionally, the generator also creates all the necessary helper classes and test units for each component.
    9 years ago by @gresch
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    The DataNucleus project provides products for the management of application data in a Java environment. Our aim is to provide good quality open source products to handle data in all of its forms, wherever it is stored. This goes from persistence of data into heterogeneous datastores, to providing methods of retrieval using a range of query languages, and eventually on to the analysis of data and tools for managing data quality. Your use of DataNucleus products will mean that you don't need to take significant time in learning the oddities of particular datastores, or query languages and instead use a single common interface for all of your data, and instead your team can concentrate their application development time on adding business logic and let DataNucleus take care of data management issues.
    9 years ago by @gresch
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    The Mogwai ERDesigner is a entity relation modeling tool such as ERWin and co. The only difference is that it is Open Source and does not cost anything. It was designed to make database modeling as easy as it can be and to support the developer in the whole development process, from database design to schema and code generation. This tool was also designed to support a flexible plug in architecture, to extend the system simply by installing a new plug in. This way, everybody can implement new features and tools to make ERDesigner fit the requirements. ERDesigner NG * is based on Java and can be run on Windows and Unix systems * has a powerfull WYSIWYG for physical database design * handles tables, relations, indexes and comments * supports subject areas * supports MySQL, Oracle, Microsoft SQLServer and Postgres * creates the SQL DDL statements for schema creation * has an integrated schema version control system * can generate schema migration scripts for every change * stores the database definition as XML files for further processing * can export the database schema as GIF, BMP, JPEG or SVG files * has an integrated reverse engineering module for existing schemas * it is based on GPL license * support is available by authors and newsgroups
    9 years ago by @gresch
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    The Eclipse Persistence Services Project (EclipseLink) project's goal is to provide a complete persistence framework that is both comprehensive and universal. It will run in any Java environment and read and write objects to virtually any type of data source, including relational databases, XML, or EIS systems. EclipseLink will focus on providing leading edge support, including advanced feature extensions, for the dominant persistence standards for each target data source; Java Persistence API (JPA) for relational databases, Java Architecture for XML Binding (JAXB) for XML, J2EE Connector Architecture (JCA) for EIS and other types of legacy systems, and Service Data Objects (SDO).
    9 years ago by @gresch
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