Using SQLite with iOS... strange warnings - ios

Question

I'm having an issue where I execute my app, I get the following warning:
"Incompatible pointer types passing 'const char *' to parameter of type 'sqlite3_stmt *' (aka 'struct sqlite3_stmt *')".
It only happens on the following lines:
if (sqlite3_prepare_v2(database, sql, -1, &databasePath, NULL)!=SQLITE_OK)
while (sqlite3_step(sql) == SQLITE_ROW)
szStore = [NSString stringWithUTF8String:(char*)sqlite3_column_text(sql, 0)];
szReg = [NSString stringWithUTF8String:(char*)sqlite3_column_text(sql, 1)];
sqlite3_finalize(sql);
Here is the function:
-(IBAction)setInput:(id)sender
{
NSString *strStoreNumber;
NSString *strRegNumber;
strStoreNumber = StoreNumber.text;
strRegNumber = RegNumber.text;
lblStoreNumber.text = strStoreNumber;
lblRegNumber.text = strRegNumber;
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* documentsDirectory = [paths lastObject];
// NSString* databasePath = [documentsDirectory stringByAppendingPathComponent:#"tblStore.sqlite"];
NSString* databasePath = [[NSBundle mainBundle] pathForResource:#"tblStore" ofType:#"sqlite"];
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
NSLog(#"Opened sqlite database at %#", databasePath);
//...stuff
}
else
{
NSLog(#"Failed to open database at %# with error %s", databasePath, sqlite3_errmsg(database));
sqlite3_close (database);
}
NSString *querystring;
// create your statement
querystring = [NSString stringWithFormat:#"SELECT strStore FROM tblStore WHERE strStore = %#;", strStoreNumber];
const char *sql = [querystring UTF8String];
NSString *szStore = nil;
NSString *szReg = nil;
if (sqlite3_prepare_v2(database, sql, -1, &databasePath, NULL)!=SQLITE_OK) //queryString = Statement
{
NSLog(#"sql problem occured with: %s", sql);
NSLog(#"%s", sqlite3_errmsg(database));
}
else
{
// you could handle multiple rows here
while (sqlite3_step(databasePath) == SQLITE_ROW) // queryString = statement
{
szStore = [NSString stringWithUTF8String:(char*)sqlite3_column_text(databasePath, 0)];
szReg = [NSString stringWithUTF8String:(char*)sqlite3_column_text(databasePath, 1)];
} // while
}
sqlite3_finalize(databasePath);
// Do something with data...
}
Any help or insight would be greatly appreciated. Thanks!

Answer 1

The database path is passed instead a statement handle pointer. Replace
if (sqlite3_prepare_v2(database, sql, -1, &databasePath, NULL)!=SQLITE_OK)
with
sqlite3_stmt *statement = nil;
if (sqlite3_prepare_v2(database, sql, -1, &statement, NULL)!=SQLITE_OK)
and set the finalization line to
sqlite3_finalize(statement);
The documentation on sqlite3_prepare_v2 gives more details on this method.