Kompex SQLite Wrapper for C++ - Examples

Here you can see some examples.
It shows a part of the functionality of the wrapper and how you can use it.
You can find more examples in the example application (contained in download package).


1. open a database and create a statement instance for sql queries/statements

1. //opendatabase
2. Kompex::sqliteDatabase*pDatabase=newKompex::sqliteDatabase("test.db",sqlITE_OPEN_READWRITE,0);
3. //createstatementinstanceforsqlqueries/statements
4. Kompex::sqliteStatement*pStmt=newKompex::sqliteStatement(pDatabase);

2. create a new table and fill it with data

1. //createtableandinsertsomedata
2. pStmt->sqlStatement("CREATETAbleuser\
3. (\
4. userIDINTEGERNOTNULLPRIMARYKEY,\
5. lastNameVARCHAR(50)NOTNULL,\
6. firstNameVARCHAR(50),ageINTEGER\
7. )");
9. pStmt->sqlStatement("INSERTINTOuser(userID,lastName,firstName,age)\
10. VALUES(1,'Lehmann','Jamie',20)");
11. pStmt->sqlStatement("INSERTINTOuser(userID,age)\
12. VALUES(2,'Burgdorf','Peter',55)");
13. pStmt->sqlStatement("INSERTINTOuser(userID,age)\
14. VALUES(3,'Fernando',18)");
15. pStmt->sqlStatement("INSERTINTOuser(userID,age)\
16. VALUES(4,'Carlene',17)");

3. use some aggregate functions

1. pStmt->sqlAggregateFuncResult("SELECTCOUNT(*)FROMuserWHERElastName='Lehmann';");
2. pStmt->sqlAggregateFuncResult("SELECTCOUNT(weight)FROMuser;");
3. pStmt->sqlAggregateFuncResult("SELECTMAX(age)FROMuser;");
4. pStmt->sqlAggregateFuncResult("SELECTMIN(age)FROMuser;");
5. pStmt->sqlAggregateFuncResult("SELECTAVG(age)FROMuser;");
6. pStmt->sqlAggregateFuncResult("SELECTSUM(age)FROMuser;");
7. pStmt->sqlAggregateFuncResult("SELECTTOTAL(age)FROMuser;");

4. execute and process a sql query

1. pStmt->sql("SELECT*FROMuserWHEREfirstName='Jamie';");
2. //processallresults
3. while(pStmt->FetchRow())
4. {
5. std::cout<<"firstname:"<<pStmt->GetColumnInt(0)<<std::endl;
6. std::cout<<"lastname:"<<pStmt->GetColumnString(1)<<std::endl;
7. std::cout<<"firstname:"<<pStmt->GetColumnString(2)<<std::endl;
8. }
9. //donotforgettoclean-up
10. pStmt->FreeQuery();

5. execute a simple transaction

1. //ifanerroroccurs,arollbackisautomaticallyperformed
2. pStmt->BeginTransaction();
3. pStmt->Transaction("INSERTINTOuser(userID,age)VALUES(10,'Makoto',23)");
4. pStmt->Transaction("INSERTINTOuser(userID,age)VALUES(11,'Yura',20)";
5. pStmt->Transaction("INSERTINTOuser(userID,age)VALUES(12,63)");
6. pStmt->CommitTransaction();

6. here you can see the exception handling

1. try
2. {
3. //tablestructure:userIDINTEGERNOTNULLPRIMARYKEY,lastNameVARCHAR(50)
4. pStmt->sqlStatement("INSERTINTOuser(userID,lastName)VALUES(1,'Lehmann')");
5. //thefollowinglinewillthrowanexceptionbecausetheprimarykeyisnotunique
6. pStmt->sqlStatement("INSERTINTOuser(userID,'Bergmann')");
7. }
8. catch(Kompex::sqliteException&exception)
9. {
10. std::cerr<<"ExceptionOccured"<<std::endl;
11. exception.Show();
12. }

7. work with a memory database

1. Kompex::sqliteDatabase*pDatabase=newKompex::sqliteDatabase("scores.db",0);
2. //movedatabasetomemory,sothatweareworkonthememorydatabasehence
3. pDatabase->MoveDatabasetoMemory();
5. Kompex::sqliteStatement*pStmt=newKompex::sqliteStatement(pDatabase);
6. //insertsomedatasetsintothememorydatabase
7. pStmt->sqlStatement("INSERTINTOscore(id,lastscore,avgscore)VALUES(1,429,341)");
8. pStmt->sqlStatement("INSERTINTOscore(id,avgscore)VALUES(2,37,44)");
9. pStmt->sqlStatement("INSERTINTOscore(id,avgscore)VALUES(3,310,280)");
11. //savethememorydatabasetoafile
12. //ifyoudon'tdoit,alldatabasechangeswillbelostafterclosingthememorydatabase
13. pDatabase->SaveDatabaseFromMemoryToFile("newscores.db");

8. get some result values via column name (more flexible and a little bit slower than the common way)

1. pStmt->sql("SELECT*FROMuserWHERElastName='Lehmann';");
3. //processallresults
4. while(pStmt->FetchRow())
5. {
6. std::cout<<"firstName:"<<pStmt->GetColumnString("firstName")<<std::endl;
7. std::cout<<"age:"<<pStmt->GetColumnInt("age")<<std::endl;
8. }
10. //donotforgettoclean-up
11. pStmt->FreeQuery();

9. two possibilities to update data in the database

1. //thefirstway
2. pStmt->sqlStatement("UPDATEuserSETweight=51.5,age=18WHEREfirstName='Carlene'");
4. //thesecondway-withapreparedstatement
5. pStmt->sql("UPDATEuserSETlastName=@lastName,age=@ageWHEREuserID=@userID");
7. //bindanintegertothepreparedstatement
8. pStmt->BindString(1,"Urushihara");//bindlastName
9. pStmt->BindInt(2,56);//bindage
10. pStmt->BindInt(3,2);//binduserID
12. //executeitandclean-up
13. pStmt->ExecuteAndFree();