jdbcjson

JDBCJSON is a simple utility for generating JSON from SQL queries using JDBC. JDBCJSON takes a simple properties file for it's configuration.

basic usage

First, create your properties file. JDBCJSON breaks properties down by jobs. Each job has three parameters, url, sql and out. url is the JDBC connection URL. sql is the SQL statement executed whose result is used to generate the JSON. out is the path for resulting JSON. Take the following example:

mytable.url = jdbc:postgresql://localhost/mydb
	mytable.sql = SELECT * FROM mytable
	mytable.out = mytable.json

This properties file will create a job called "mytable" that will query a postgresql database on localhost, selecting all the columns from mytable, and output the result to mytable.json. Multiple jobs may be specified in a single properties file.

Next, run JDBCJSON. It's always a good idea to specify the debug switch the first time you run a new properties file against JDBC. The debug switch will give you additional warnings about things like unsupported fields (BLOBs, for example.)

java -jar jdbcjson.jar -d mytable.properties

advanced usage

Only the url parameter of a properties file is required. The other two properties have default values, based on the job name. The sql parameter defaults to "SELECT * FROM ". The out parameter defaults to ".json". Thus,

mytable.url = jdbc:postgresql://localhost/mydb

Is the same as

mytable.url = jdbc:postgresql://localhost/mydb
	mytable.sql = SELECT * FROM mytable
	mytable.out = mytable.json