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

### Db::set_re_len |

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    #include <db_cxx.h>

    int
    Db::set_re_len(u_int32_t re_len);

    int
    Db::get_re_len(u_int32_t *re_lenp);

### Description: Db::set_re_len

For the Queue access method, specify that the records are of length re_len. For the Queue access method, the record length must be enough smaller than the database's page size that at least one record plus the database page's metadata information can fit on each database page.

For the Recno access method, specify that the records are fixed-length, not byte-delimited, and are of length re_len.

Any records added to the database that are less than re_len bytes long are automatically padded (see Db::set_re_pad for more information).

Any attempt to insert records into the database that are greater than re_len bytes long will cause the call to fail immediately and return an error.

The Db::set_re_len method configures a database, not only operations performed using the specified Db handle.

The Db::set_re_len method may not be called after the Db::open method is called. If the database already exists when Db::open is called, the information specified to Db::set_re_len will be ignored.

The Db::set_re_len 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

re_len
  The re_len parameter is the length of a Queue or Recno database record, in bytes.

### Errors

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

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

### Description: Db::get_re_len

The Db::get_re_len method returns the record length.

The Db::get_re_len method may be called at any time during the life of the application.

The Db::get_re_len 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

re_lenp
  The Db::get_re_len method returns the record length in re_lenp.

### Class

Db

### See Also

Databases and Related Methods`

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