//监测数据库中我要需要的表是否已经存在

	NSString *existsSql = [NSString stringWithFormat:@"select count(name) as countNum from sqlite_master where type = 'table' and name = '%@'", @"Member" ];

	FMResultSet *rs = [membersDB executeQuery:existsSql];

	if ([rs next]) {

		NSInteger count = [rs intForColumn:@"countNum"];

		NSLog(@"The table count: %li", count);

		if (count == 1) {

			NSLog(@"存在");

			return;

		}
       }

//检测某个数据是否存在

FMResultSet *rs =[membersDB executeQuery:@"SELECT COUNT(Name) AS countNum FROM Member WHERE Name = ?",self.nameTextField.text];

	while ([rs next]) {

		NSInteger count = [rs intForColumn:@"countNum"];

		if (count > 0) {

		       //存在

		}

		else

		{

			//不存在

		}

	}