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# Adding new fields in DB Object
For example `add_pitchDiag` in object `DbTechLayer`.
| | Action | File | Source Code |
|---|--------------------------------------------------------|-------------------|------------------------------------------------------------------------------------|
| 1 | Add Fields at the .h file | `dbTechLayer.h` | |
| 2 | Define a keyword for db rev number | `dbDatabase.h` | `#define ADS_DB_DF58 52` |
| 3 | Set the current rev number same as | `dbDatabase.h` | `#define ADS_DB_SCHEMA_MINOR 52` |
| 4 | Stream in new fields Conditionally upon Schema number | `dbTechLayer.cpp` | `if ( stream.getDatabase()->isSchema(ADS_DB_DF58) ) { stream >> layer._pitchDiag;` |
| 5 | Stream out new fields Conditionally upon Schema number | `dbTechLayer.cpp` | `if ( stream.getDatabase()->isSchema(ADS_DB_DF58) ) { stream << layer._pitchDiag;` |
| 6 | Conditionally Diff new fields | `dbTechLayer.cpp` | `if ( stream.getDatabase()->isSchema(ADS_DB_DF58) ) { DIFF_FIELD(_pitchDiag);` |
| 7 | Conditionally Diff Out new fields | `dbTechLayer.cpp` | `if ( stream.getDatabase()->isSchema(ADS_DB_DF58) ) { DIFF_OUT_FIELD(_pitchDiag);` |
| 8 | Created access APIs to the fields | `dbTechLayer.cpp` | `"dbTechLayer::getPitchDiag(), dbTechLayer::setPitchDiag( int pitch )"` |
| 9 | Add new APIs in include/db.h | db.h | `class dbTechLayer` |
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