ddp cookbook

Label:The fifth Chapter Metadata query query database itself Information table structure index, etc.5.1 Querying all table information under the test libraryMysql from ' Test ';ORACLESelect from where ' Test ';5.2 Querying the information for columns in a tableMysqlSELECT * from WHERE = ' Test ' and = ' Student ';ORACLESelect * from where = ' Test ' and = ' Student ';5.3 List Indexes of tablesMysqlIndex from EMP;ORACLESelect from where = ' EMP ' and = ' Test ';5.4 Listing table constrain

NULL.To resolve this problem, you can use is to determine null:1 mysql>Selectfromwherenot=1or =2or=3orisnull) \g5. Left JoinA a LEFT outer join b bReturns all rows in a, match in B returns, or null if no match6. N-1 RulesIf the FROM clause has n tables, the minimum number of n-1 joins is required to avoid producing a Cartesian product7. Full OUTER JOIN onReturns the missing rows from two tables and all matching rows8. Use null for calculations and comparisonsUse the COALESCE function to conver

() functionb, use the Format function date_format () or Time_format () and a specific format string to get a date or time value to decompose the required partC, treat a time or date as a string, and then use the left () or mid () function to get the desired portion from it.Extract () function to decompose a date or time valueUse the Format function to decompose a date or time value:Benefit: Display the resulting decomposition results in a user-specified formatUse a string to decompose time or d

# coding=utf-8 # Remove First, last, average def avg (rest): return sum (REST)/rest.__len__ () def Drop_first_last (grades): Fir St, *middle, last = grades return avg (middle) print (Drop_first_last (99,2,3,4,5,6,7,8,1)) # asterisk expression is

1, create a sequence private generate sequence valueUsing Auto_increment If the ID is explicitly set to a non-null value, there are two results: A, this value appears in the table, because the ID column is the primary key, and therefore does not

Http://www.cppblog.com/mzty/archive/2007/03/04/19163.html C ++ random Classification List (advanced) C ++ casual Classification List (advanced ): C ++ highlights:61 object-oriented design principles Http://www.cppblog.com/mzty/archive/2005/12/29/22

Simulate generic Java's generic system cannot work well with its dynamic reflection API. for jmock, this means that when you simulate generics, the compiler will warn you of possible static type errors. the warning is incorrect. the best way to

Briefly introduces the basic classes of OC. CategoryOC's built-in capability to expand already-existing classes is one of its most powerful features. This behavioral expansion is called a category. Categories extend class functionality without

This book is not intended for beginners. This book mainly explains how to use some ready-made class libraries, including the C ++ standard library and boost library. Chapter 4 Create a c ++ Application 1. Compile, Link, static/dynamic library 2.

IntroductionSQL is a language in the computer world. When developing reports using relational databases, you need SQL knowledge to put data into databases and obtain data from databases. Many people use SQL in a careless manner and do not realize

Given a dictionary D, direct d [Key] = value. If the key is not D, an entry is automatically added to D. D = {'name': 'Small C '}Print dD ['age'] = 21Print d ---------- Python ----------{'Name': '\ xd0 \ xa1c '}{'Age': 21, 'name': '\ xd0 \ xa1c '}

The model class for deleting data CakePHP provides several methods to delete records from the database. Deletedelete (int $ id = null, boolean $ cascade = true); delete a record with $ id. By default, records that depend on deleted records are also

Although there are a lot of questions, they are the most common ones. If you are ready to participate in the relevant interview, it is best to see. In particular, the last dozens of multinational companies face questions. Now many domestic

1, String propertyView the systems that have those character sets:If you need to store from multiple languages into the same column, you will consider the Unicode character set (UTF8 or UCS2), only it can represent multiple language charactersSome

1, Clone table (create a table that exactly matches an existing table structure)Create TABLE ... like clone table structure; clone some or all of the table data using the INSERT INTO ... SELECT statement2. Save the query results to a tableA, use

A component is a logical package shared among multiple controllers. If you find that you want to copy and paste something between controllers, you should consider encapsulating some functions in a component. CakePHP also comes with a set of

Uiview and uiwindowThe iPhone rule goes like this: one window, comment views. Metaphorically speaking, uiwindow is the TV set, and uiviews are the actors on your favorite show. Uiviews are user interface building blocks. Every iPhone user

A component component is a logical package that is shared across multiple controllers. If people find themselves wanting to copy and paste something between controllers, you should consider wrapping some functionality in one component. CakePHP also

Import reDef multiple_replace (text, adict ):Rx = re. compile ('|'. join (map (re. escape, adict )))Def one_xlat (match ):Return adict [match. group (0)]Return rx. sub (one_xlat, text) Print multiple_replace ('abc123erts', {'A': 'A', 'B': 'B '})

1 serveralias p71Multiple Domain names can be configured for one VMServername www.maxthon.com serveralias www.maxthon1.com www.maxthon2.com 2 apachectl graceful P17Restart Apache and close the link after the active connection is enabled. 3.