Get Started

Welcome to SchemaSpy. We will do the best to simplify documentation process of your database.


Parameters can be specified in the comand line (described below) or you can predefine configuration in the file. SchemaSpy will search configuration file in <current-dir>/ To use an alternative configuration file run SchemaSpy with parameter: java -jar schemaspy.jar -configFile path/to/config.file

Config file example:

# type of database. Run with -dbhelp for details
# optional path to alternative jdbc drivers.
# database properties: host, port number, name user, password
# output dir to save generated files
# db scheme for which generate diagrams

Running SchemaSpy

You can easily run SchemaSpy from the command line:

java -jar schemaspy.jar -t dbType -dp C:/sqljdbc4-3.0.jar -db dbName -host server -port 1433 [-s schema] -u user [-p password] -o outputDir

Parameters priority

It is important to notice, that command-line parameters override those configured in file.

Commonly used parameters

[-t databaseType]
Type of database (e.g. ora, db2, etc.). Use -dbhelp for a list of built-in types. Defaults to ora.
[-db dbName]
Name of database to connect to
[-u user]
Valid database user id with read access. A user id is required unless -sso is specified.
[-s schema]
Database schema. This is optional if it’s the same as user or isn’t supported by your database. Use -noschema if your database thinks it supports schemas but doesn’t (e.g. older versions of Informix).
[-p password]
Password associated with that user. Defaults to no password.
[-o outputDirectory]
Directory to write the generated HTML/graphs to
[-dp pathToDrivers]
Looks for drivers here before looking in driverPath in [databaseType].properties. The drivers are usually contained in .jar or .zip files and are typically provided by your database vendor. Supports a directory as argument, which will add directory and all content to classpath, will recurse. Supports multiple paths separated by OS dependent path separator
[-hq] or [-lq]
Generate higher or lower-quality diagrams. Various installations of Graphviz (depending on OS and/or version) will default to generat /ing either higher or lower quality images. That is, some might not have the “lower quality” libraries and others might not have the “higher quality” libraries. Higher quality output takes longer to generate and results in significantly larger image files (which take longer to download / display), but the resultant Entity Relationship diagrams generally look better.
[-imageformat outputImageFormat]
The format of the image that gets generated. Supported formats are svg and png. Defaults to png. E.g. -imageformat svg

For a comprehensive listing see Command-Line Arguments

Advanced Usage

Supply Connection-properties

As an example running mysql with a new driver you’ll get warning
According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn’t set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to ‘false’. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.

This can be omited by addind connection property useSSL=false

To add this connection property add following to commandline: -connprops useSSL\\=false

-connprops can also take a properties file as argument but when escaping the = with double \ it will use it as “useSSL=false” If key or value contains / it needs to be escaped with a single \. Multiple pairs can be separated by ;

Create your own DB type

As an example we will add the connection property from above to the mysql db-type

  1. Create a new file in same directory as the schemaspy-jar, let’s call it

  2. Add the following content to mysql-nossl.properies:

  3. Now you can run schamaspy with -t mysql-nossl

If you want to have a closer look at the db-types you can find them at github

Create you own DB type super advanced

Now we are going to connect to mysql thru unix socket, put on your helmets

  1. Download a unix socket library for java and all of it’s dependencies, for simplicity put them in a sub-folder called drivers in the same folder as the schemaspy-jar:

    junixsocket-native-2.0.4-x86_64-MacOSX-gpp-jni.nar <- Im on OSX
  2. Create your own db-type let’s call it in same folder as the schemaspy-jar with following content:

    socketFactory=ClassName of socket factory which must be in your classpath
    socket=Path To Socket
  3. Now run schemaspy with the following options:

    java -jar [schemaspy.jar] -t my-mysq-socket \
    -dp lib/mysql-connector-java-[version].jar \
    -loadjars \
    -db [DBName] \
    -host localhost \
    -port 3306 \
    -u [User] \
    -socketFactory \
    -socket [pathToSocket] \
    -o [outputDir]

    Replace values accordingly.
    Yes, you need to specify -db, -host, -port
    Yes, the socketFactory could have been written directly into the properties-file, this is just an example, mysql-socket exists as a db-type exactly like this.
    And since you might want to use another unix socket library this doesn’t close any doors.

Add markdown comments using additional metadata

Schemaspy supports markdown in comments markdown
Not all dbms supports comments or long enough comments or comments might just be missing.

Schemaspy also supports supplying additional metadata SchemaMeta
More precise the ability to add/replace comments. Add comments/remarks

<schemaMeta xmlns:xsi="" xsi:noNamespaceSchemaLocation="" >
    <comments>Database comment</comments>
        <table name="ACCOUNT" comments="I've added comment that links using markdown to markdown documentation [markdown](">
            <column name="accountId" comments="And now the schemaspy avatar ![avatar]( "SchemaSpy")"/>

Now just run with -meta [path-to-above-xml]