2019独角兽企业重金招聘Python工程师标准>>> 
- (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:YES];
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
NSString *idStr =[NSString stringWithFormat:@"%d",i];
NSString *stName = [NSString stringWithFormat:@"student%d",i];
NSString *insertSql = @"insert into student(id,name) values(?,?)";
if (![_dataBase executeUpdate:insertSql,idStr,stName]) {
NSLog(@"insert error:%@",_dataBase.lastErrorMessage);
}
}
}
@catch (NSException *exception) {
//捕获到异常
NSLog(@"error:%@",exception.reason);
isError = YES;
[_dataBase rollback];//回滚，回到最初的状态
}
@finally {
//无论有没有异常，代码都会执行到此处
if (isError==NO) {
[_dataBase commit];//提交事务，让批量操作生效
}
}
}else{
//常规操作
for (int i=0; i
NSString *idStr =[NSString stringWithFormat:@"%d",i];
NSString *stName = [NSString stringWithFormat:@"student%d",i];
NSString *insertSql = @"insert into student(id,name) values(?,?)";
if (![_dataBase executeUpdate:insertSql,idStr,stName]) {
NSLog(@"insert error:%@",_dataBase.lastErrorMessage);
}
}
}
}