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# SDO Relational Data Access Service

Table of Contents

- Introduction
- Installing/Configuring
  - Requirements
  - Installation
  - Runtime Configuration
  - Resource Types
- Predefined Constants
- Examples
  - Creating, retrieving, updating and deleting data
  - Specifying the metadata
  - One-table examples
  - Two-table examples
  - Three-table example
- Limitations
- SDO-DAS-Relational Functions
  - SDO_DAS_Relational::applyChanges — Applies the changes made to a data graph back to the database.
  - SDO_DAS_Relational::__construct — Creates an instance of a Relational Data Access Service
  - SDO_DAS_Relational::createRootDataObject — Returns the special root object in an otherwise empty data graph. Used when creating a data graph from scratch.
  - SDO_DAS_Relational::executePreparedQuery — Executes an SQL query passed as a prepared statement, with a list of values to substitute for placeholders, and return the results as a normalised data graph.
  - SDO_DAS_Relational::executeQuery — Executes a given SQL query against a relational database and returns the results as a normalised data graph.