BerkeleyDB-Core-c++-GSG

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Table of Contents Preface .......... iv Conventions Used in this Book ......... iv For More Information ......... v 1. Introduction to Berkeley DB ......... 1 About This Manual .......... 2 Berkeley DB Concepts ........... 2 Access Methods ......... 4 Selecting Access Methods ......... 4 Choosing between BTree and Hash ..........5 Choosing between Queue and Recno ........... 5 Database Limits and Portability .......... 6 Environments ........6 Exception Handling ........... 7 Error Returns ...........8 Getting and Using DB ........... 8 2. Databases ........... 9 Opening Databases ............ 9 Closing Databases ........... 10 Database Open Flags ............ 11 Administrative Methods ........... 11 Error Reporting Functions .......... 13 Managing Databases in Environments ...........15 Database Example .......... 17 3. Database Records .......... 20 Using Database Records ..........20 Reading and Writing Database Records ........... 21 Writing Records to the Database ..........21 Getting Records from the Database ...........22 Deleting Records .......... 23 Data Persistence ..........23 Database Usage Example ........... 24 4. Using Cursors .......... 33 Opening and Closing Cursors .......... 33 Getting Records Using the Cursor .......... 34 Searching for Records .............35 Working with Duplicate Records ........38 Putting Records Using Cursors .......... 40 Deleting Records Using Cursors ........... 42 Replacing Records Using Cursors .......... 43 Cursor Example .......... 44 5. Secondary Databases ........... 49 Opening and Closing Secondary Databases ............ 50 Implementing Key Extractors .......... 51 Working with Multiple Keys ..........52 Reading Secondary Databases ........ 53 Deleting Secondary Database Records ........ 54 等等

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