what is difference between kindles

For example, the Add method of a user Class, returns the user object instance in case of success, returns false in case of failure and can get the reason string of failure by the GetError method .... Speaking of which, I seem to understand that the Add method should always return the user object, or throw an exception? But in that case, there's no difference in the amount of code they have. The problem is

Original link: http://blog.163.com/baibai_zheng/blog/static/51980755201022125325689/Introduction: Recently contacted Laravel database migration, the code Schema let me to the database and the difference between the two a bit of a circle, and then have this reprint.Creating a schema in MySQL seems to have the same effect as creating a database, which looks different in SQL Server and Orcal databases. At the moment I can only understand that schemaThe r

less than the nominal capacity, which in addition to some small amount of loss (algorithm, particle difference), some phones will also be the GPU occupied a portion of RAM, so some 2G mobile phones will see the actual capacity is 1.7g~1.8g. And the usable capacity will be less than the actual capacity, is due to the system occupation and the background of the us

[Interview Questions] What is the difference between sizeof and strlen? sizeofstrlen Example: constchar * p = "Hello World"; char p [] = "Hello World"; what is the difference between length and occupied space? A: You can use strle

type is greater than the source type: for example, int data can be automatically converted to double type2: Force data type conversion (narrowing conversion)Precede the variable with parentheses, specifying the type of the strong conversion in parenthesesExample: double A = 40.9;int b= (int) A;Note: Casting can lose numeric precision, such as a double type variable a, which is converted to an int type afte

1. Please check the information to understand these terms:/dev/hda,/dev/hdb,/DEV/SDA,/dev/sdb, what is the difference between them?A: Hda generally refers to the IDE interface of the hard disk, HDA refers to the first hard disk, HDB refers to the second hard disk, etc.; SDA refers to the SATA interface of the hard disk, SDA refers to the first hard disk, SDB refe

What is the difference between an interface and an abstract class?What is the difference between an interface and an abstract class? What is

The Internet bandwidth problem is already the main bottleneck affecting Internet development, in many webmasters, many webmasters asked this question: "What is the difference between dual-line Single IP address and dual-line Dual IP address? What

Who told me what is the difference between the PHP5 series and the PHP4 series? who told me what is the difference between the PHP nbsp; 5 Series and PHP nbsp; 4 Series? currently, I only find PHP nbsp; does MYSQL be used as a

What is the difference between AMD Series A and FX series CPUs? In fact, the concept of the previous CPU is wrong, really do not know how to express the right. The difference between AMD Series A and FX series is obvious, the a se

which is good for PHP and python? What is the difference between PHP and python? A lot of friends will come to ask such a question, then today's PHP Chinese network for everyone to say about the difference between PHP and Python,I believe you read this article should have so

What is the difference between variable variables and reference values in php? In addition to the difference of amp, are there any other differences? What are the differences between variable variables and Reference Assignment in php? I just started to learn php by myself.

have a difference with a stone.But the unfortunate thing happened, one day, on the earth appeared a great man, his name is Lenin, he is familiar with Marx, Engels of dialectical materialism thought after the masterpiece, quite experience, so he made a famous definition: the so-called material, is to be reflected in th

PDO: ERRMODE_EXCEPTIONPDO: ERRMODE_WARNING what is the difference? After reading this, I think the formats of the feedback information are different. What else does it look like? That is, when I explain it, I have a word quot; throw quot;. Who can tell me

I have graduated for one year in June. This year is a year of great changes. At the end of my student age, I entered a new and familiar field. Technology is the starting point for programmers who have just stepped out of employment. At work, I have been working for many "Great God" programmers. In my own work environment, there are many such "Great God" programmers, but

add method, the exception can be further thrown up until it is processed or the process crashes? But in the end, what is the difference between this and the natural collapse of the program? ---- The above is self-speaking. The following

Current_User can see, re-emphasize) without the default Schema, when we use the CREATE TABLE a statement, a will look for the DBO schema, And try to create it on the DBO schema, but what if the user who creates the a table has only read-only permission to the DBO schema, without the Write permission? At this time the A-table is neither established nor successful, this