Teleporter
OrientDB Teleporter is a tool that synchronizes a RDBMS to OrientDB database. You can use Teleporter to:
- Import your existing RDBMS to OrientDB
- Keep your OrientDB database synchronized with changes from the RDBMS. In this case the database on RDBMS remains the primary and the database on OrientDB a synchronized copy. Synchronization is one way, so all the changes in OrientDB database will not be propagated to the RDBMS
Teleporter is fully compatible with several RDBMS that have a JDBC driver: we successfully tested Teleporter with Oracle, SQLServer, MySQL, PostgreSQL and HyperSQL. Teleporter manages all the necessary type conversions between the different DBMSs and imports all your data as Graph in OrientDB.
NOTE: This feature is available both for the OrientDB Enterprise Edition and the OrientDB Community Edition. But beware: in community edition you can migrate your source relational database but you cannot enjoy the synchronize feature, only available in the enterprise edition.
How Teleporter works
Teleporter looks for the specific DBMS meta-data in order to perform a logical inference of the source DB schema for the building of a corresponding graph model. Eventually the data importing phase is performed.
Teleporter has a pluggable importing strategy. Two strategies are provided out of the box:
- naive strategy, the simplest one
- naive-aggregate strategy. It performs a "naive" import of the data source. The data source schema is translated semi-directly in a correspondent and coherent graph model using an aggregation policy on the junction tables of dimension equals to 2
To learn more about the two different execution strategies click here.
Usage
Teleporter is a tool written in Java, but can be used as a tool thanks to the teleporter.sh script (or .bat on Windows).
./oteleporter.sh -jdriver <jdbc-driver> -jurl <jdbc-url> -juser <username>
-jpasswd <password> -ourl <orientdb-url> [-s <strategy>]
[-nr <name-resolver>] [-v <verbose-level>]
([-include <table-names>] | [-exclude <table-names>])
[-inheritance <orm-technology>:<ORM-file-url>]
[-conf <configuration-file-location>]
Arguments
- -jdriver is the driver name of the DBMS from which you want to execute the import (it's not case sensitive)
- -jurl is the JDBC URL giving the location of the source database to import
- -ourl is the URL for the destination OrientDB graph database
- -juser (optional) is the username to access the source database
- -jpasswd (optional) is the password to access the source database
- -s (optional) is the strategy adopted during the importing phase. If not specified naive-aggregate strategy is adopted. Possible values:
- naive: performs a "naive" import of the data source. The data source schema is translated semi-directly in a correspondent and coherent graph model
- naive-aggregate: performs a "naive" import of the data source. The data source schema is translated semi-directly in a correspondent and coherent graph model using an aggregation policy on the junction tables of dimension equals to 2
- -nr (optional) is the name of the resolver which transforms the names of all the elements of the source database
according to a specific convention (if not specified original convention is adopted). Possible values:
- original: maintains the original name convention
- java: performs name transformations on all the elements of the data source according to the Java convention
- -v (optional) is the level of verbosity printed to the output during the execution (if not specified INFO level will be adopted). Levels:
- 0: NO logging messages will be printed
- 1: DEBUG level logging messages
- 2: INFO level logging messages (default)
- 3: WARNING level logging messages
- 4: ERROR level logging messages
- -include (optional) allows you to import only the listed tables
- -exclude (optional) excludes the listed tables from the importing process
- -inheritance (optional) executes the import taking advantage of OrientDB's polymorphism
- -config allows you to define a custom configuration for your importing job
Access Credentials
By convention three users are always created by default each time a new database is built. Passwords are the same as the user name. Default users are:
admin, with default password "admin", has access to all functions without limitation.reader, with default password "reader", is the classic read-only user. The reader can read any records but can't modify or delete them and has no access to internal information such as users and roles, themselves.writer, with the default password "writer", is like the user reader but can also create, update, and delete records.
For further informations about the Security of the OrientDB database click here.
Example of "testdb" importing from PostgreSQL DBMS with default parameters
./oteleporter.sh -jdriver postgresql -jurl jdbc:postgresql://localhost:5432/testdb
-juser username -jpasswd password -ourl plocal:$ORIENTDB_HOME/databases/testdb
With these parameters it will be performed an import according to the default settings:
- strategy adopted: naive-aggregate
- name resolver: original name resolver
- level of verbosity: INFO (2nd level)
Example of "testdb" importing from PostgreSQL DBMS with customized optional parameters
./oteleporter.sh -jdriver postgresql -jurl jdbc:postgresql://localhost:5432/testdb
-juser username -jpasswd password -ourl plocal:$ORIENTDB_HOME/databases/testdb
-s naive -nr java -v 1
With these parameters it will be performed an import according to the chosen settings:
- strategy adopted: naive
- name resolver: java name resolver
- level of verbosity: DEBUG (1st level)
Teleporter Execution
Teleporter execution consists of 4 steps:
- Source DB Schema Building: the source database schema is built by querying the source DB metadata.
- Graph Model Building: a correspondent and coherent Graph Model is built.
- OrientDB Schema Writing: the OrientDB schema is written according to the Graph Model in memory.
- OrientDB importing: importing data from source database to OrientDB.
Thus the whole workflow is:
Below is reported a Teleporter execution dump:
