FMDB Transaction Usage

Transaction.m

- (void)handleTransaction:(UIButton *)sender {
    NSString *documentPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
    NSString *dbPath = [documentPath stringByAppendingPathComponent:@"test1.db"];
    FMDatabase *db = [[FMDatabase alloc]initWithPath:dbPath];
    if (![db open]) {
        return;
    }
    BOOL result = [db executeUpdate:@"create table if not exists text1 (name text,age,integer,ID integer)"];
    if (result) {
        NSLog(@"create table success");
    }
    //1.开启事务
    [db beginTransaction];
    NSDate *begin = [NSDate date];
    BOOL rollBack = NO;
    @try {
        //2.在事务中执行任务
        for (int i = 0; i< 500; i++) {
            NSString *name = [NSString stringWithFormat:@"text_%d",i];
            NSInteger age = i;
            NSInteger ID = i *1000;
            
            BOOL result = [db executeUpdate:@"insert into text1(name,age,ID) values(:name,:age,:ID)" withParameterDictionary:@{@"name":name,@"age":[NSNumber numberWithInteger:age],@"ID":@(ID)}];
            if (result) {
                NSLog(@"在事务中insert success");
            }
        }
    }
    @catch(NSException *exception) {
        //3.在事务中执行任务失败，退回开启事务之前的状态
        rollBack = YES;
        [db rollback];
    }
    @finally {
        //4. 在事务中执行任务成功之后
        rollBack = NO;
        [db commit];
    }
    NSDate *end = [NSDate date];
    NSTimeInterval time = [end timeIntervalSinceDate:begin];
    NSLog(@"在事务中执行插入任务 所需要的时间 = %f",time);
}