How to use sqlite3 in a cocos2d-x project in XCode

I download C/C++ interface for SQLite from here. And I get 4 source files shell.c, sqlite3.c, sqlite3.h and sqlite3ext.h.

Now I add all these 4 files into my cocos2d-x project and use the following code for test:

#include "sqlite/sqlite3.h"

sqlite3 *pDB = NULL;
char * errMsg = NULL;
std::string sqlstr;
int result;

result = sqlite3_open("save.db", &pDB);
if( result != SQLITE_OK )
    CCLog( "failed，status_code:%d ，error_msg:%s\n" , result, errMsg );

sqlite3_close(pDB);

Then I run it. But it builds failed, the error is showing below:

duplicate symbol _main in:

/Users/tangyue/Library/Developer/Xcode/DerivedData/CrossKaiser-bkepfijxelboxkchsxvcmpozrwlt/Build/Intermediates/CrossKaiser.build/Debug-iphonesimulator/CrossKaiser.build/Objects-normal/i386/main.o

/Users/tangyue/Library/Developer/Xcode/DerivedData/CrossKaiser-bkepfijxelboxkchsxvcmpozrwlt/Build/Intermediates/CrossKaiser.build/Debug-iphonesimulator/CrossKaiser.build/Objects-normal/i386/shell.o

ld: 1 duplicate symbol for architecture i386 clang: error: linker

command failed with exit code 1 (use -v to see invocation)

I think there must be a main in these file, which occurs this error. And I find main method in the file shell.c. Because I don't include this file in my test code, I remove it from the project.

Then I run it again. This time, it build success, but the value of result is NOT SQLITE_OK, it is 14(SQLITE_CANTOPEN), which means 'Unable to open the database file'.

Now what should I do to run the program correctly? What is the shell.c file used for, and is it wrong for me to remove it from project.

[update]

I solove it use the following code:

string dbPath = CCFileUtils::sharedFileUtils()->getWriteablePath();
dbPath.append("save.db");

CCLog("%s", dbPath.c_str());

result = sqlite3_open_v2(dbPath.c_str(), &pDB, SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE, NULL);

instead of

result = sqlite3_open("save.db", &pDB);