I’ve been looking for a while for a tool to generate graphs from sql schemas. This obvious operation seems implemented in many graphical design tools for database, but up until now, I didn’t manage to find a command line tool to output a simple graph. Well, the answer came from sqlfairy ( http://sqlfairy.sourceforge.net/ ), a perl library to manipulate structured data definitions.

for example, to generate a nice picture from an existing sqlite database, this is the pipeline :

echo ".schema" | sqlite3 database > schema.sql

sqlt-graph --from=SQLite -o schema.png schema.sql

UPDATE: if you actually want to display relations between your tables, you can use FOREIGN KEY / REFERENCE definitions. Sqlite3 actually parses these definitions, but does not enforce them. On the other hand sqlfairy does not accept foreign key definitions if using the sqlite parser backend. The solution is to use the MySQL parser backend instead so to generate a nice graph.

An example is attached.

UPDATE: if you use postgresql, you should definitely have a look at pg_autodoc : http://www.rbt.ca/autodoc/index.html

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