Data sources

Describes data initialization, spreadsheet input/output, data consistency, and preprocessing.

Data initialization
Defines internal versus external initialization, describes how to initialize arrays, tuples, and sets, and discusses memory allocation aspects of data initialization.
Database support
Defines OPL database support, including exchanging data with databases, reading to and writing from databases, and creating your own custom database connection.
Spreadsheet Input/Output
Describes how to connect an MS Excel spreadsheet, read from it, and write the results to the connected spreadsheet.
Data consistency
Defines the purpose of data consistency and describes data membership and assertions as ways to ensure consistency.
Preprocessing of data
Provides an overview of preprocessing operations in OPL.
Pitfall of lazy initialization of data
In OPL, external data is always initialized before internal data.

Parent topic: OPL, the modeling language