Hi,

When I want to put a record into my database which has been created
and opened in an environment with below code, It returns an "Invalid
argument"error, error number: 22.

code: (omit some...)

/**create env **/
……………………
penv->open(penv, "/root/db_ccurnt", DB_CREATE|DB_INIT_MPOOL, 0);
db_create(&usr, penv, 0);
usr->open(usr, NULL, "database", NULL, DB_BTREE, DB_CREATE,
0666);

usr->cursor(usr, NULL, &wcursor, 0);
key.data = xx;
key.size = strlen(xx) + 1;
value.data = yy;
value.size = strlen(yy) + 1;

ret = wcursor->c_put(wcursor, &key, &value, DB_KEYFIRST);
if (ret)
{
printf("error num: %d%s\n", ret, db_strerror(ret));
goto error;
}
Will anybody shed some shine for me?Thanks!

Do you do this:

memset(&key, 0, sizeof key);
memset(&value, 0, sizeof value);

before using the DBTs? If not, the other fields in the DBT struct will
lead to invalid argument errors.

Also, you should enable error messages with DB_ENV->set_errfile before
opening the environment. That should give more information when things
go wrong.

Regards,
Michael.

Thanks for your help, Michael.