Berkeley DB: Db::rename
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++

### Db::rename |

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###

    #include <db_cxx.h>

    int
    Db::rename(const char *file,
        const char *database, const char *newname, u_int32_t flags);

### Description: Db::rename

The Db::rename method renames the database specified by the file and database parameters to newname. If no database is specified, the underlying file represented by file is renamed, incidentally renaming all of the databases it contained.

Applications should not rename databases that are currently in use. If an underlying file is being renamed and logging is currently enabled in the database environment, no database in the file may be open when the Db::rename method is called. In particular, some architectures do not permit renaming files with open handles. On these architectures, attempts to rename databases that are currently in use by any thread of control in the system will fail.

The Db::rename method may not be called after calling the Db::open method on any Db handle. If the Db::open method has already been called on a Db handle, close the existing handle and create a new one before calling Db::rename.

The Db handle may not be accessed again after Db::rename is called, regardless of its return.

The Db::rename method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

### Parameters

database
  The database parameter is the database to be removed.

file
  The file parameter is the physical file which contains the database(s) to be removed.

flags
  The flags parameter is currently unused, and must be set to 0.

newname
  The newname parameter is the new name of the database or file.

### Environment Variables

If the database was opened within a database environment, the environment variable DB_HOME may be used as the path of the database environment home.

Db::rename is affected by any database directory specified using the DbEnv::set_data_dir method, or by setting the "set_data_dir" string in the environment's DB_CONFIG file.

### Errors

The Db::rename method may fail and throw DbException, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:

DB_FILEOPEN
  An attempt was made to rename the underlying file and a database in the file was currently open.

EINVAL
  If Db::rename called after Db::open was called; or if an invalid flag value or parameter was specified.

ENOENT
  The file or directory does not exist.

### Class

Db

### See Also

Databases and Related Methods`

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