| Firebird Documentation Index → Firebird 2.5 Language Reference → System Tables → RDB$FUNCTIONS |
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RDB$FUNCTIONS stores the information needed by the engine about external functions (user-defined functions, UDFs).
In future major releases (Firebird 3.0 +) RDB$FUNCTIONS will also store the information about stored functions: user-defined functions written in PSQL.
| Column Name | Data Type | Description |
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| RDB$FUNCTION_NAME | CHAR(31) | The unique (declared) name of the external function |
| RDB$FUNCTION_TYPE | SMALLINT | Not currently used |
| RDB$QUERY_NAME | CHAR(31) | Not currently used |
| RDB$DESCRIPTION | BLOB TEXT | Any text with comments related to the external function |
| RDB$MODULE_NAME | VARCHAR(255) | The name of the dynamic library or shared object where the code of the external function is located |
| RDB$ENTRYPOINT | CHAR(31) | The exported name of the external function in the function library. Note, this is often not the same as RDB$FUNCTION_NAME, which is the identifier with which the external function is declared to the database |
| RDB$RETURN_ARGUMENT | SMALLINT | The position number of the returned argument in the list of parameters corresponding to input arguments |
| RDB$SYSTEM_FLAG | SMALLINT | Flag indicating whether the filter is user-defined
or internally defined:
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| Firebird Documentation Index → Firebird 2.5 Language Reference → System Tables → RDB$FUNCTIONS |