IB/FB　UDF的调用方法：

DECLARE EXTERNAL FUNCTION MOD_USER
CSTRING (32),
CSTRING (9),
CSTRING (32),
CSTRING (9),
CSTRING (32),
CSTRING (32),
CSTRING (32),
INTEGER,
INTEGER
RETURNS INTEGER BY VALUE
ENTRY_POINT 'fn_user_modify' MODULE_NAME 'libudedf_services';

DECLARE EXTERNAL FUNCTION DEL_USER
CSTRING (32),
CSTRING (9),
CSTRING (32),
RETURNS INTEGER BY VALUE
ENTRY_POINT 'fn_user_delete' MODULE_NAME 'libudedf_services';

我加上，但不知在SQL中如何使用？
谢谢！

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我只能举个例子，你多试几个就会明白的，和 pascal/c/c++ 里函数调用很类似
select * from [table]
where MOD_USER([char_field/"ABC"], ...) = 1