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Designing databasesThe first step in creating a relational database is to construct a data model, which is a precise, complete definition of the data you want to store. After you prepare your data model, you must implement it as a database and tables. To implement your data model, you first select a data type for each column and then you create a database and tables and populate the tables with data. You can also implement fragmentation strategies and control access to your data.
Designing and Implementing a DatabaseThe HCL OneDB™ Database Design and Implementation Guide provides information to help you design, implement, and manage your HCL® OneDB® databases. It includes data models that illustrate different approaches to database design and shows you how to use structured query language (SQL) to implement and manage your databases.
Object-relational databases
Create and use user-defined casts
Cast to smart large objects

Cast to smart large objects

The database server provides casts to allow the conversion of TEXT and BYTE objects to BLOB and CLOB data types. This feature allows users to migrate BYTE and TEXT data from legacy databases into BLOB and CLOB columns.

The following example shows how to use an explicit cast to convert a BYTE column value from the catalog table in the stores_demo database to a BLOB column value and update the catalog table in the superstores_demo database:

UPDATE catalog SET advert = ROW (
(SELECT cat_photo::BLOB FROM stores_demo:catalog 
   WHERE catalog_num = 10027), 
   advert.caption)
      WHERE catalog_num = 10027

The database server does not provide casts to convert BLOB to BYTE values or CLOB to TEXT values.

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