Data Access and SQL > SQL Tables > Structural Definition > Creating the Definition in C++
 
Creating the Definition in C++
All of the steps described in the previous section can also be carried out by coding in C++. This following example shows how this can be done:
*Create the IliSQLTable object
IlvDisplay* display;
...
IliSQLTable* sqlTbl = new IliSQLTable(display);
sqlTbl->lock();
*Specify the database tables
IliSQLTableRef refEMP(“EMP”, “SCOTT”);
IliSQLTableRef refDEPT(“DEPT”, “SCOTT”);
IlInt tblEMP = sqlTbl->addTable(refEMP);
IlInt tblDEPT = sqlTbl->addTable(refDEPT);
*Specify the joins
sqlTbl->addJoin(tblEMP, “DEPTNO”, tblDEPT, “ID”);
*Specify the columns
IlInt cID = sqlTbl->appendColumn(“ID”, IliIntegerType);
sqlTbl->setColumnPartOfKey(cID, IlvTrue);
sqlTbl->setColumnSQLText(cID, “ID”);
sqlTbl->setColumnTable(cID, tblEMP);
 
IlInt cNAME = sqlTbl->appendColumn(“NAME”, IliStringType);
sqlTbl->setColumnSQLText(cNAME, “NAME”);
sqlTbl->setColumnTable(cNAME, tblEMP);
 
IlInt cDEPT = sqlTbl->appendColumn(“DEPT”, IliStringType);
sqlTbl->setColumnSQLText(cDEPT, “NAME”);
sqlTbl->setColumnTable(cDEPT, tblDEPT);
A computed column could be defined in the following way (note that the following code excerpt is not part of the example).
IlInt cTOTAL = sqlTbl->appendColumn(“TOTAL”, IliIntegerType);
sqlTbl->setColumnSQLText(cTOTAL, “PRICE * QTY”);
*Specify the criteria
IlInt where = 0;
sqlTbl->insertConjunct(where,IlvTrue);
sqlTbl->setColumnPredicat(cNAME, where, “<> ‘Smith’”, IlvTrue);
*Specify the sort
sqlTbl->setColumnOrderBy(cNAME, IliSQLAscending);
*Specify the updatable table
sqlTbl->setTableUpdatable(tblEMP, IlTrue);
*Generate the SQL SELECT statement
sqlTbl->makeQuery();
At this point, the IliSQLTable object is defined and ready for use. Calling the getQuery member function generates the following SQL statement:
SELECT EMP.ID, EMP.NAME, DEPT.NAME
FROM SCOTT.EMP, SCOTT.DEPT
WHERE EMP.DEPTNO = DEPT.ID
AND EMP.NAME <> ‘Smith’
ORDER BY 2

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