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unit. It is impossible for any thread that executes the synchronization code block to see that other threads are executing the synchronization code block protected by the same lock. Note: It doesn't mean that the synchronized code block or the synchronized method is an integral whole and an atomic one, because obviously there is no mutex between different locks. Introduction of ticket purchase examples The following is a program used to simulate ticket sales at the railway station. In theory,

query, add shopping cart and payment functions, the query function includes querying the product, viewing details, and calculating the total price of the product; adding a shopping cart includes viewing details, adding a shopping cart to a product, and paying for the product. Currently, these two modules do not work collaboratively, so we will adapt the shopping cart to work with viewing the product, achieve their integrated operations. Their detailed structure diagram is as follows: Now, the

(translation value 2) ... elsif (conditional = = value N) then return (translated value n) else return (default) End if Note: The default value can be either the column name you want to select or the other values you want to define, such as other; An example is provided: The definition of a table named output, which defines two column is Monthid (VAR) and sale (number type), if the sale value =1000

Tags: return com out table based on tab from if statement berSyntax for the decode () function: 1 Select decode (ColumnName, value 1, translation value 1, value 2, translation value 2,... Value n, translation value n, default value) 2 3 from talbename 4 5 Where ... Where: ColumnName is the column defined in the table to be selected; The default value can be the column name you want to choose, or the other values you want to define, such as other; Primary role: Equivalent to the IF statement,

(1) Preparation environment 1) Create an employee tablemysql> create table company.employee6( -> emp_id int auto_increment primary key not null, -> emp_name varchar(10), -> age int, -> dept_id int);mysql> insert into employee6(emp_name,age,dept_id) values -> (‘tom‘,19,200), -> (‘jack‘,30,201), -> (‘alice‘,24,202), -> (‘robin‘,40,200), -> (‘natasha‘,28,204);2) Create a departmental tablemysql> create table company.department( -> dept_id int, -> dept_name varchar(1

In recent months, the internet most of the webmaster are worried about the thing is that Baidu algorithm updated, and Baidu algorithm update is mainly in order to deal with the low quality of the site and link the sale of links. The author is not a cow, just from the perspective of Baidu, Baidu how to judge the friendship link trading? One: Buy friendship links. Baidu Link to the purchase of the site's attack is obvious to all, this period of time,

another rowArg2 is the offset of the current row partition that you want to retrieve. is a positive offset, when one retrieves the number of previous rows back.Arg3 is the value returned when the number represented by Arg2 exceeds the range of the grouping. Look at a few SQL statements: Statement one: Select Row_number () over (order by sale/cnt Desc) as sort, sale/cntFrom (Select-60 as

column 1 is not null;There is a sales table sale with the following structure: Month char (6) -- month Sellnumber () -- monthly sales amount Create table sale (month char (6), Region number ); Insert into sale values ('20140901', 200001 ); Insert into sale values ('20140901', 200002 ); Insert into

some data that meets the query conditions may not be found. In count (*), nvl (column name, 0) is used for processing and then query.(7) sorting is larger than other data (the index is sorted in descending order by default, small → large), so the NULL value is always at the end.Usage:SQL> select 1 from dual where null = null; no records foundSQL> select 1 from dual where null = ''; no records foundSQL> select 1 from dual where ''=''; no records foundSQL> select 1 from dual where null is null; 1

1. The Code executed by each thread is the same If the code executed by each thread is the same, it is easier to share data. You can use the same Runnable object, which contains the shared data. Public class multithread1_data1{Public static void main (String [] args){SaleTickets sale = new SaleTickets ();New Thread (sale). start ();New Thread (sale). start ();}}

1. Define Factory.js files var Appfactorys = angular.module (' Starter.factorys ', []) appfactorys.factory (' Housefactory ', function () { var houselist = [ {id:0, title: ' Urgent sale of the North two-ring community supporting complete fine decoration ', Price: ' 88.0 ', describe: ' 2 Room 1 Hall 120 square meters ', img: ' Img/ben.png '}, {id:1, Title: ' Urgent sale of the East two rin

{Code...} I want to change it to this {code ...} dump($array); Array (2) {[0] => array (6) {["record_id"] => string (1) "1" ["record_create_time"] => string (10) "1470650276" ["record_create_people"] => string (12) "tester" ["record_name"] => string (9) "vpn for sale" ["record_comment"] => string (20) "10 monthly VPN for sale" ["record_money"] => string (6) "100000"} [1] => array (6) {["record_id"] => strin

number of rows in the past is retrieved. Arg3 is the value returned when the number indicated by arg2 exceeds the group range. Let's look at several SQL statements: Statement 1: select row_number () over (order by sale/cnt desc) as sort, sale/cnt from (select-60 as sale, 3 as cnt from dual union select 24 as sale, 6 a

shows a sequence chart for calculating the cumulative amount in a transaction. The call starts from the calctotal () method of the sale class.CodeThe segment is given after the sequence diagram. Glossary: UML defines an operation as a signature of a method ). The term "method" is reserved for the code that implements the operation. However, in the Java environment, the term "method" is more widely used. In a UML sequence diagram, calling an operatio

number of rows in the past is retrieved.Arg3 is the value returned when the number indicated by arg2 exceeds the group range. Check Several SQL statements: Statement 1: Select row_number () over (order by sale/cnt desc) As sort, sale/CNTFrom (Select-60 as sale, 3 as CNT from dual UnionSelect 24 as sale, 6 as CNT fro

by arg2 exceeds the group range. Check Several SQL statements: Statement 1: Select row_number () over (order by sale/cnt desc) As sort, sale/CNTFrom (Select-60 as sale, 3 as CNT from dual UnionSelect 24 as sale, 6 as CNT from dual UnionSelect 50 as sale, 5 as CNT from dual

Original post address:Http://community.csdn.net/Expert/topic/3485/3485588.xml? Temp =. 8813745. -- Sample DataCreate Table sale (date datetime, code varchar (10), amt int)Insert sale select '2014-10-22 ', 'A', 2004Union all select '2014-10-22 ', 'bb', 2004Union all select '2014-10-22 ', 'cc', 2004Union all select '2014-10-23 ', 'A', 2004Union all select '2014-10-23 ', 'bb', 2004Union all select '2014-10-23

one, each thread executes the same Code If each thread executes the same code, it is more convenient to share the data. You can use the same Runnable object, which has the shared data in the Runnable object. public class MultiThreadShareData1{public static void Main (string[] args){Saletickets sale = new Saletickets ();New Thread (Sale). Start ();New Thread (Sale

Original post address: http://community.csdn.net/Expert/topic/3485/3485588.xml?temp=.8813745 --Sample data CREATE TABLE Sale (date datetime,code varchar (), AMT int) Insert Sale Select ' 2004-10-22 ', ' AA ', 15000 UNION ALL SELECT ' 2004-10-22 ', ' BB ', 18000 UNION ALL SELECT ' 2004-10-22 ', ' cc ', 20000 UNION ALL SELECT ' 2004-10-23 ', ' AA ', 21000 UNION ALL SELECT ' 2004-10-23 ', ' BB ', 18500 UNION

class-to-table relationships: ************* Employee.java ************* Package blog.hibernate.domain; public class Employee { private int id; private String name; public int getId () { return ID; } public void setId (int id) { this.id = ID; } Public String GetName () { return name; } public void SetName (String name) { this.name = name; } @Override public String toString () { return "employee{" + "id=