unibase

Type Members

1. class DocumentSerializer extends AnyRef

   

   Document serializer.

   Document serializer. By default, document key size is up to 64KB, column size is up to 10MB.

2. class Table extends UpdateOps

   

   Tables are the data containers of documents.

   Tables are the data containers of documents. A document is simply a JSON object with a unique id (the _id field), which is similar to the primary key in relational database. The key can be arbitrary JSON value including Object and Array. However, they are some limitations in practice:

   • The size limitation. The id of document serves as the row key in the underlying BigTable implementation. Most BigTable implementations have the upper limit of row key (often as 64KB).
   • For compound primary key (i.e. multiple fields), it is better use Array instead of Object as the container because it maintains the order of fields, which is important in the scan operations. When serializing an Object, the order of fields may be undefined (because of hashing) or simply ascending in field name.
   • The fields of compound primary key should be fixed size. In database with schema (e.g. relational database). The variable length field is padded to the maximum size. However, Unibase is schemaless database and thus we are lack of this type information. It is the developer's responsibility to make sure the proper use of primary key. Otherwise, the index and scan operations won't work correctly.

3. class Unibase[+T <: BigTable] extends AnyRef

   

   A Unibase is a database of documents.

   A Unibase is a database of documents. A collection of documents are called table.

4. trait UpdateOps extends AnyRef

   

   Document update operators for columnar JSON serialization.