HSQLDB (Hyper SQL Database) is a relational database management system written in Java. It offers a fast, small database engine which brings both in-memory and disk-based tables.

LSC provides HSLQDB library and a utility script that allows to use this database to store temporary synchronization data, for example to use a CSV file as a source.

Script location

LSC provides a wrapper to manage the packaged HSQLDB database, it is located in the LSC bin directory and is named hsqldb.

You can execute it to see the possible options:

$ bin/hsqldb

 bin/hsqldb [<option>]

 One option from available options is:
   --import <file> [<table>] [<separator>]    Import data from CSV file
   --drop [<table>]   Drop data
   --show [<table>]   Show data from database
   --start   Start the server
   --stop    Stop the server
   --status  Display server status
   --help    Print informations

Start/stop HSQLDB

Start HSQLB will the following command:

$ bin/hsqldb --start

You can then check the status:

$ bin/hsqldb --status
HSQLDB Server is running (PID 7020)

To stop it:

$ bin/hsqldb --stop


If you stop HSQLDB, all registered data will be lost.

Import CSV data

By default, your HSQLDB database is empty. You can load the data with this command:

$ bin/hsqldb --import tutorial.csv
1 lines imported into table csvdata


By default, data are loaded in table csvdata but you can change the table name, for example:

$ bin/hsqldb --import tutorial.csv tutorial
1 lines imported into table tutorial

You can then display imported data:

$ bin/hsqldb --show
----  ---  ---------  --------  ----------------
jdoe  Doe  John       John Doe  jdoe@example.com


You can specify the table name after the --show option.

Remove data

You can remove data by dropping a table:

$ bin/hsqldb --drop


You can specify the table name after the --drop option.

Run SQL queries

You can run SQL queries on HSQLDB database :

# Generic (see lsc-sample in doc)
$ "${JAVA_COMMAND}" -jar "$HSQLDB_LIB" --rcFile "$HSQLDB_RC" --sql "YOUR_SQL_QUERY" lscdb

# Debian
$ java -jar /usr/lib/lsc/hsqldb-VERSION.jar --rcFile /var/lsc/hsqldb/hsqldb.rc --sql 'YOUR_SQL_QUERY' lscdb


Don’t forget ; at the end of SQL query

Example of HSQLDB connector

If you want a complete example of HSQLDB source connector with LSC, give a look at Synchronize from CSV to LDAP howto.