所以我的代码是假设创建一个数据库和表，然后将我的位置数据存储在表中。它击中了我制作的所有正确日志，例如“创建的表”和“插入的位置”，但是当我去查找文件时，它要么 (a) 不存在，要么 (b) 存在但其中没有位置数据。
我开始使用 CoreData，但它很快变成了一场噩梦，所以我改为直接使用 sqlite。
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
locationManager =[[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = 10;
[locationManager startUpdatingLocation];
// Create a string containing the full path to the bold2.db inside the documents folder
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *databasePath = [documentsDirectory stringByAppendingPathComponent:@"bold2.sql"];
// Check to see if the database file already exists
bool databaseAlreadyExists = [[NSFileManager defaultManager] fileExistsAtPath:databasePath];
// Open the database and store the handle as a data member
if (sqlite3_open([databasePath UTF8String], &databasehandle) == SQLITE_OK)
{
// Create the database if it doesn't yet exists in the file system
if (!databaseAlreadyExists)
{
// Create the LOCATION table
const char *sqlStatement = "CREATE TABLE IF NOT EXISTS LOCATION (ID INTEGER PRIMARY KEY AUTOINCREMENT, latitude DOUBLE, longitude DOUBLE, timeStamp DATE)";
char *error;
if (sqlite3_exec(databasehandle, sqlStatement, NULL, NULL, &error) == SQLITE_OK)
{
NSLog(@"Created Table");
}
}
这是我获取新位置并将其插入数据库的位置委托。奇怪的是它实际上命中了“插入的位置”日志。
-(void) locationManager: (CLLocationManager *) manager
didUpdateToLocation: (CLLocation *) newLocation
fromLocation: (CLLocation *) oldLocation
{
NSString *insertStatement = [NSString stringWithFormat:@"INSERT INTO location (latitude, longitude, timeStamp) VALUES (%g, %g, %g)",newLocation.coordinate.latitude, newLocation.coordinate.longitude, newLocation.timestamp];
char *error;
if ( sqlite3_exec(databasehandle, [insertStatement UTF8String], NULL, NULL, &error) == SQLITE_OK)
{
NSLog(@"Location inserted. %g", newLocation.coordinate.latitude);
}
else NSLog(@"Error: %s", error);
}