2. Embedded SQL for C : Advanced Processing : User-Defined Data Handlers for Large Objects : ESQL/C Usage Notes
 
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ESQL/C Usage Notes
When using ESQL/C, the following notes apply:
The data handler, and the data handler argument, should not be declared in an ESQL declare section. Therefore do not use a colon before the data handler or its argument.
You must ensure that the data handler argument is a valid C pointer. ESQL will not do any syntax or datatype checking of the argument.
The data handler must be declared to return an integer. However, the actual return value will be ignored.