#include <db.h>

int
db_create(DB **dbp, DB_ENV *dbenv, u_int32_t flags);

Description

The db_create method creates a DB structure that is the handle for a Berkeley DB database. A pointer to this structure is returned in the memory to which db refers. Calling the DB->close, DB->remove or DB->rename methods will discard the returned handle.

If the dbenv argument is NULL, the database is standalone; that is, it is not part of any Berkeley DB environment.

If the dbenv argument is not NULL, the database is created within the specified Berkeley DB environment. The database access methods automatically make calls to the other subsystems in Berkeley DB, based on the enclosing environment. For example, if the environment has been configured to use locking, the access methods will automatically acquire the correct locks when reading and writing pages of the database.

The flags value must be set to 0 or the following value:

DB_XA_CREATE

Instead of creating a standalone database, create a database intended to be accessed via applications running under an X/Open conformant Transaction Manager. The database will be opened in the environment specified by the OPENINFO parameter of the GROUPS section of the ubbconfig file. See the XA Introduction section in the Berkeley DB Reference Guide for more information.

The DB handle contains a special field, "app_private", which is declared as type "void *". This field is provided for the use of the application program. It is initialized to NULL and is not further used by Berkeley DB in any way.

The db_create method returns a non-zero error value on failure and 0 on success.

Errors

The db_create method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the db_create method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

Class

See Also