vela.rb

v = Vela::DB.new
v.src_connection(user: 'root', password: 'pass', host: '127.0.0.1', database: 'testdb', adapter: 'mysql')
v.dst_connection(user: 'user', password: 'pass', host: '127.0.0.1', database: 'testpdb', adapter: 'postgresql')
v.dbsync("src_tbl", "dst_tbl")  # destination table should already been exist

# if your destination tables' columns are different than the source table (e.g; clonse `col1` data to m_col1 column):
v.dbsync("your_src_tbl", "your_dst_tbl", {"col1" => "m_col1", "col2" => "m_col2"})  # you can add as much as column as you want