objective-c - SQLITE3 约束失败

Question

我关于 stackoverflow 的第一个问题，我真的希望你们能帮助我。

我一直试图让准备好的语句在 Objective-C 中运行，到目前为止一切顺利。
但是现在，当我尝试添加轨道时，我的数据库中不断出现“约束失败”。

我已经删除了数据库并重新创建了它，但错误仍然存​​在。
此外，我一直在研究重复键，但我没有看到我在任何地方添加了重复项。
位置表添加得很好，并且它的构建方式相同。

我的数据库:

CREATE TABLE locations
    (LocationID INTEGER PRIMARY KEY AUTOINCREMENT,
    TimestampGPS DATE NOT NULL,
    Longitude REAL NOT NULL,
    Latitude REAL NOT NULL,
    Altitude REAL NOT NULL,
    Accuracy REAL NOT NULL,
    Bearing REAL NOT NULL,
    Speed REAL NOT NULL,
    TimestampDevice DATE NOT NULL);

CREATE TABLE tracks
    (TrackID INTEGER PRIMARY KEY AUTOINCREMENT,
    Title VARCHAR,
    Description VARCHAR,
    StartTrackDeviceTime DATE NOT NULL,
    EndTrackDeviceTime DATE NOT NULL);

CREATE TABLE track_locations
    (TrackID INTEGER NOT NULL REFERENCES tracks(TrackID), 
    LocationID INTEGER NOT NULL REFERENCES locations(LocationID),
    PRIMARY KEY (TrackID, LocationID));

我添加轨道的代码。 (我有代码可以添加一个类似的位置，并且可以正常工作)

const char *sqlTrack = "INSERT INTO tracks(Title, Description, StartTrackDeviceTime, EndTrackDeviceTime) VALUES(?, ?, ?, ?)";
if(sqlite3_prepare_v2(db.dataBase, sqlTrack, -1, &addTrackStatement, NULL) != SQLITE_OK) {
    NSLog(@"Error: %s", sqlite3_errmsg(db.dataBase));
}

sqlite3_bind_text(addTrackStatement, 1, [track.title UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(addTrackStatement, 2, [track.description UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(addLocationStatement, 3, [[dateFormatter stringFromDate:track.startTime] UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(addTrackStatement, 4, [[dateFormatter stringFromDate:track.endTime] UTF8String], -1, SQLITE_TRANSIENT);

NSLog(@"Going to execute the statement");
if(SQLITE_DONE != sqlite3_step(addTrackStatement)) {
    NSLog(@"First step failed");
    NSLog(@"Error: %s", sqlite3_errmsg(db.dataBase));
    return NO;
}
else {
    long insertedTrack = sqlite3_last_insert_rowid(db.dataBase);
    NSLog(@"Inserted id on TRACK: %ld", insertedTrack);

    //HERE I ALSO ADD LOCATIONS

    sqlite3_clear_bindings(addTrackStatement);
    sqlite3_reset(addTrackStatement);
}

Answer 1

这条线是否应该:

sqlite3_bind_text(addLocationStatement, 3, [[dateFormatter stringFromDate:track.startTime] UTF8String], -1, SQLITE_TRANSIENT);

读:

sqlite3_bind_text(addTrackStatement, 3, [[dateFormatter stringFromDate:track.startTime] UTF8String], -1, SQLITE_TRANSIENT);