Berkeley DB: DB

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Berkeley DB: DB_LOGC->get

DB_LOGC->get

#include <db.h> int DB_LOGC->get(DB_LOGC *logc, DB_LSN *lsn, DBT *data, u_int32_t flags); Description: DB_LOGC->get The DB_LOGC->get method returns records from the log. Unless otherwise specified, the DB_LOGC->get method returns a non-zero error value on failure and 0 on success. Parameters dataThe data field of the data structure is set to the record retrieved, and the size field indicates the number of bytes in the record. See DBT for a description of other fields in the data structure. The DB_DBT_MALLOC, DB_DBT_REALLOC and DB_DBT_USERMEM flags may be specified for any DBT used for data retrieval. flagsThe flags parameter must be set to one of the following values: DB_CURRENTReturn the log record to which the log currently refers. DB_FIRSTThe first record from any of the log files found in the log directory is returned in the data parameter. The lsn parameter is overwritten with the DB_LSN of the record returned. The DB_LOGC->get method will return DB_NOTFOUND if DB_FIRST is set and the log is empty. DB_LASTThe last record in the log is returned in the data parameter. The lsn parameter is overwritten with the DB_LSN of the record returned. The DB_LOGC->get method will return DB_NOTFOUND if DB_LAST is set and the log is empty. DB_NEXTThe current log position is advanced to the next record in the log, and that record is returned in the data parameter. The lsn parameter is overwritten with the DB_LSN of the record returned. If the cursor has not been initialized via DB_FIRST, DB_LAST, DB_SET, DB_NEXT, or DB_PREV, DB_LOGC->get will return the first record in the log. The DB_LOGC->get method will return DB_NOTFOUND if DB_NEXT is set and the last log record has already been returned or the log is empty. DB_PREVThe current log position is advanced to the previous record in the log, and that record is returned in the data parameter. The lsn parameter is overwritten with the DB_LSN of the record returned. If the cursor has not been initialized via DB_FIRST, DB_LAST, DB_SET, DB_NEXT, or DB_PREV, DB_LOGC->get will return the last record in the log. The DB_LOGC->get method will return DB_NOTFOUND if DB_PREV is set and the first log record has already been returned or the log is empty. DB_SETRetrieve the record specified by the lsn parameter. lsnWhen the flag parameter is set to DB_CURRENT, DB_FIRST, DB_LAST, DB_NEXT or DB_PREV, the lsn parameter is overwritten with the DB_LSN value of the record retrieved. When flag is set to DB_SET, the lsn parameter is the DB_LSN value of the record to be retrieved. Errors The DB_LOGC->get method may fail and return one of the following non-zero errors: EINVALIf the DB_CURRENT flag was set and the log cursor has not yet been initialized; the DB_CURRENT, DB_NEXT, or DB_PREV flags were set and the log was opened with the DB_THREAD flag set; the DB_SET flag was set and the specified log sequence number does not appear in the log; or if an invalid flag value or parameter was specified. Class DB_ENV, DB_LOGC, DB_LSN See Also Logging Subsystem and Related Methods