Atitit. Composite variables, that is, similar to the $ $a variable principle and implementation of Java c#.net PHP js

atitit. compound variables, that is, variables like $ $a the principle and realization of java c#.net php js

1 . 1. A compound variable, which is a variable like $ $a , is interpreted two times. 1

1 . 2. compound variables inside the database 1

1 . 3. why only PHP implements the compliance variable, because his dollar sign 2

1 . 4. the nature of a conforming variable is actually a pointer. 2

2 .  Implementing a conforming variable using java 2

2 . 1. Invoke 2

2 . 2. Implement 2

3 .  Reference 4

1.1.A compound variable, which is a variable like $ $a , is interpreted two times.

This gives PHP a very flexible dynamic feature.

1.2.compound variables inside the database

Records (record)

What is a record:

a record is a compound variable that consists of several related values and is often used to support SELECT The return value of the statement. Records can be used to treat a row of data as a unit, rather than having to handle each column separately, similar to an object in an object-oriented programming language or a C -language structure.

Plsql Compound Variable

a compound variable refers to a variable that holds multiple values. When you define a composite variable, you must use The composite data type of PL/SQL. PL/SQL includes
Four composite data types such as PL/SQL records,PL/SQL tables, nested tables, and varray .

1.3.why onlyPHP implements a compliance variable because his dollar sign

Dollar inherited from perl...

Dollar is not a must. Only need to use when the fatal dollar is OK lazy. not nessury var must dollar start:

author:: Nickname:Old Wow's claws( Full Name::AttilaxAkbar Al Rapanui Attilaksachanui) Kanji Name:Ayron, email:[email protected]

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1.4.the nature of a conforming variable is actually a pointer.2. Implementing a conforming variable using java 2.1.Invoke

Import static AAA. varutil.*;

Public class Dynavar {

Public static void main (string[] args) {

def Span style= "Font-family:consolas; Color: #000000; font-size:12pt; " > ( "$a" , "v_a" );

def Span style= "Font-family:consolas; Color: #000000; font-size:12pt; " > ( "$b" ,  );

echo Span style= "Font-family:consolas; Color: #000000; font-size:12pt; " > ( $ ( "$b" ));

Echo ($("$ $b"));

}

2.2.Implement

Package AAA;

Import Java.util.Map;

Import com.attilax.lang.AString;

Import Com.google.common.collect.Maps;

public class Varutil {

public static Map Vars_map=maps.newconcurrentmap ();

/**

*//var Use

* @param var_name

* @return

*/

public static Object $ (String var_name) {

int Dollarindex=var_name.lastindexof ("$");

if (dollarindex==0)

Return Vars_map.get (Var_name);

String Left=astring.left (Var_name, Dollarindex);

String rit= var_name.substring (Dollarindex);

Char[] A=left.tochararray ();

Object var_v= Vars_map.get (RIT);

for (int i = 0; i < a.length; i++) {

String new_var_name= "$" +var_v.tostring ();

Var_v=vars_map.get (New_var_name);

}

return var_v;

}

// //var Define

public static void Def (string var_name, String var_val) {

Vars_map.put (Var_name, var_val);

}

public static void Echo (Object get_var) {

System.out.println (Get_var);

}

/**

*//var Use

* @param var_name

* @return

*/

// Public static Object $ (String var_name) {

// //TODO auto-generated method stub

// return Vars_map.get (var_name);

// }

}

3.Reference

Plsql Complex variables and reference variables - Blue - Blog Park . htm

Atitit. Composite variables, that is, similar to the $ $a variable principle and implementation of Java c#.net PHP js