Question

How to add all the databases from server to String array in java? I am using JOOQ api to execute SQL statements and i need to get all the databases in comboBox where i can select specific database.

Answer 1

You have several options. For instance, you could use the generated
classes from jOOQ-meta (or generate the information_schema yourself),
and then write:

Factory create = new Factory(connection, dialect);
String[] array =
create.selectDistinct(TABLES.TABLE_SCHEMA)
      .from(TABLES)
      .fetchArray(TABLES.TABLE_SCHEMA);

The same can be achieved through plain SQL, of course:

String[] array =
create.selectDistinct(field("table_schema"))
      .from("information_schema.TABLES") // Watch for case-sensitivity on MySQL
      .fetchArray(0, String.class);

Or, using the SHOW TABLES command:

String[] array =
create.fetch("SHOW TABLES")
      .intoArray(0, String.class);

Another option would be to read from JDBC’s DatabaseMetaData:

Connection connection = ...;
DatabaseMetaData meta = connection.getMetaData();
String[] array = create.fetch(meta.getSchemas()).intoArray(0, String.class);

In jOOQ 3.0, you will also be able to read the meta data through the jOOQ API:

List<Schema> schemas = create.meta().getSchemas();