# 7.2. ODPI-C Structure dpiAnnotation

This structure is part of the structure dpiDataTypeInfo and provides information about annotations associated with columns that are fetched from the database. Annotations are only available with Oracle Database 23ai (or later). Oracle Client libraries must also be 23.1 (or later).

const char *dpiAnnotation.key

  Specifies the annoation key.

uint32_t dpiAnnotation.keyLength

  Specifies the length of the annotation key, in bytes.

const char *dpiAnnotation.value

  Specifies the annoation value.

uint32_t dpiAnnotation.valueLength

  Specifies the length of the annotation value, in bytes.