TableofContents
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 ................................................................................. 48
Opening and Closing Secondary Databases .................................................... 48
Implementing Key Extractors ................................................................... 50
Working with Multiple Keys ............................................................... 51
Reading Secondary Databases ................................................................... 52
Deleting Secondary Database Records ......................................................... 53
Page iiGetting Started with DB8/14/2009
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