How to insert autoincrement record and query it with multiple keys

Question

Hi all,
I am not familiar with BerkeyleyDB, I am now doing a project that needs to insert records and then query it out with multiple keys at later time. Since there is no field that can be distinct primary key, I want to user DbSequence as auto increment primary key to db, and set other index keys as secondary db, then using join cursor to do query with multiple keys.
I don't know how to use DbSequence, can anyone direct me to a example of using DbSequence as auto increment primary key?
Regards
-Bruce

Answer 1

I figured out the method to insert record with auto increment primary key. I listed the code block below:
char m_SeqNamePositions[32] = "MyPositions";
DbSequence *m_pSeqPositions;
m_pDBPositions = new Db(NULL, 0);
          m_pDBPositions->open(NULL, pszFileName, szFileName, DB_BTREE, DB_CREATE, 0);          // 无数据文件
          m_pSeqPositions = new DbSequence(m_pDBPositions, 0);
          Dbt key((void *)m_SeqNamePositions, (u_int32_t)strlen(m_SeqNamePositions));
          m_pSeqPositions->open(NULL, &key, DB_CREATE);
db_seq_t SeqNum;
     m_pSeqPositions->get(0, 1, &SeqNum, 0);
     Dbt key((void *)&SeqNum, (u_int32_t)sizeof(SeqNum));
     Dbt data(pRecord, sizeof(*pRecord));
     return m_pDBPositions->put(NULL, &key, &data, DB_NOOVERWRITE);
m_pSeqPositions->close(0);
          m_pDBPositions->close(0);
delete m_pSeqPositions;
delete m_pDBPositions;
          m_pDBPositions = NULL;