# Db.set_append_recno

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    import com.sleepycat.db.*;

    public interface DbAppendRecno
    {
        public abstract void db_append_recno(Db db, Dbt data, int recno);
    	throws DbException;
    }
    public class Db
    {
        public void set_append_recno(DbAppendRecno db_append_recno)
    	throws DbException;
        ...
    }

# Description

When using the Db.DB_APPEND option of the Db.put method, it may be useful to modify the stored data based on the generated key. If a callback method is specified using the Db.set_append_recno method, it will be called after the record number has been selected, but before the data has been stored. The callback function must throw a DbException object to encapsulate the error on failure. That object will be thrown to caller of Db.put.

The called function must take three arguments: a reference to the enclosing database handle; the data Dbt to be stored; and the selected record number. The called function may then modify the data Dbt.

The Db.set_append_recno method configures operations performed using the specified Db handle, not all operations performed on the underlying database.

The Db.set_append_recno interface may not be called after the Db.open interface is called.

The Db.set_append_recno method throws an exception that encapsulates a non-zero error value on failure.

# Class

Db

# See Also

Databases and Related Methods`

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