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#import "RootViewController.h"#import "FMDatabase.h"@interface RootViewController (){    FMDatabase *_dataBase;}@end@implementation RootViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    NSString *dbPath = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/test.db"];    //初始化    _dataBase = [[FMDatabase alloc] initWithPath:dbPath];    if ([_dataBase open]) {       //创建表        NSString *createSql = @"create table if not exists student(id integer,name varchar(256))";        if (![_dataBase executeUpdate:createSql]) {            NSLog(@"create error:%@",_dataBase.lastErrorMessage);        }    }    //NSDate 时间类    NSDate *date1 = [NSDate date];//获取系统当前时间    [self insertDataWithCount:1000 isUseTransaction:NO];    NSDate *date2 = [NSDate date];    //取到时间的差值  (timeIntervalSinceDate 两个时间的差值，单位是秒)    //NSTimeInterval 时间差变量，秒    NSTimeInterval time = [date2 timeIntervalSinceDate:date1];    NSLog(@"time:%f",time);    	// Do any additional setup after loading the view.}//插入批量数据，是否手动启用事务- (void)insertDataWithCount:(NSInteger)count isUseTransaction:(BOOL)isUse{    if (isUse) {        //手动启用事务        BOOL isError = NO;        @try {         //写可能出现异常的代码            [_dataBase beginTransaction];//手动开启一个事务            for (int i=0; i

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