我在理解以下代码无效的原因时遇到了一些麻烦:
sqlite3_stmt *statement5;
NSString *databasePath2 = @"default-gameData.db";
NSInteger speed_int = 0;
const char *dbPath2 = [databasePath2 UTF8String];
if(sqlite3_open(dbPath2, &db)==SQLITE_OK){
NSString *getspeeds = @"SELECT * FROM planeInfo";
NSLog(@"%@",getspeeds);
const char *getspeed_stmt = [getspeeds UTF8String];
if(sqlite3_prepare_v2(db, getspeed_stmt, -1, &statement5, nil)==SQLITE_OK){
NSLog(@"%d",sqlite3_step(statement5));
NSString *org_plane_info_id = [[NSString alloc] init];
while(sqlite3_step(statement5) == SQLITE_ROW){
if((const char*)sqlite3_column_text(statement5, 1)==NULL){
org_plane_info_id = @"no";
}
else{
org_plane_info_id = [[NSString alloc] initWithUTF8String:(const char*)sqlite3_column_text(statement5, 1)];
}
NSLog(@"%@",org_plane_info_id);
if(org_plane_info_id==plane_info_id){
NSString *speed = [[NSString alloc] initWithUTF8String:(const char*)sqlite3_column_text(statement5, 2)];
NSLog(@"%@",speed);
speed_int = [speed integerValue];
return speed_int;
}
}
}
}
if(speed_int==0){
return 0;
}
sqlite3_close(db);
我发现问题的根源是数据库路径,文件存储在.h和.m文件的位置,所以我认为这是我出错的地方,但是我需要做些什么来实现工作?
答案 0 :(得分:2)
Cocoa / Foundation不知道你的文件在哪里。你需要告诉它它在应用程序包中。
NSString *databasePath2 = [[NSBundle mainBundle] pathForResource:@"default-gameData" ofType:@"db"];