RDM 11.0 Technical Overview Whitepaper - Raima

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TECHNICAL WHITEPAPERCONTENTS1. Operational Overview ............................................................................................................................................ 32. Programming with the Database API .................................................................................................................... 32.1 Allocate Handles .................................................................................................................................................. 32.2 Create or Open a Database ................................................................................................................................. 42.3 Populate and Read a Database ........................................................................................................................... 52.4 Close a Database ................................................................................................................................................ 52.5 Share/Use a Database ........................................................................................................................................ 6Sharing a Database ............................................................................................................................................... 6Using a Database .................................................................................................................................................. 62.6 Connecting Real-time Programs to Windows Databases .................................................................................... 72.7 Arrays .................................................................................................................................................................. 83. Technical Details ................................................................................................................................................... 83.1 Windows .............................................................................................................................................................. 83.2 CompactRIO VxWorks ......................................................................................................................................... 93.3 The Complete API ............................................................................................................................................. 113.4 Error Codes ....................................................................................................................................................... 154. Additional Resources .......................................................................................................................................... 234.1 Support .............................................................................................................................................................. 234.2 LabVIEW Page .................................................................................................................................................. 23P a g e | 2
TECHNICAL WHITEPAPER1. OPERATIONAL OVERVIEWThe Database API consists of a set of primitive functions that are generally consistent with the ODBC standard.Databases are defined and manipulated in the SQL language. Each Database API function calls a Native C functionthrough the Call Library Function Node VI. The Native C function will then call the RDM API (the same functionsavailable directly to the C programmer using RDM 11.0 Workgroup Edition).The basic call stack is shown in Figure 1:Figure 1: Basic Call StackThe RDM ODBC API contains all of the database manipulation logic. The basic call stack is the same whetherdeployed in Windows or CompactRIO VxWorks.Section 4 will discuss how to implement database sharing, but the basic concept of sharing is shown below:Figure 2: Sharing/Using a Database2. PROGRAMMING WITH THE DATABASE APIThose familiar with the ODBC API will recognize the steps needed to work with databases. The following sectionsshow the basic operations.2.1 Allocate HandlesThe following figure shows preparation work necessary for the rest of the steps. The Connection and/or StatementHandles are required inputs for the rest of the functions.P a g e | 3
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