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Achieve the solution of a quadratic equation (cycle), a quadratic equation cycle

has no roots. \ n", a, B, c );Break;Case 1:Printf ("The equation % gx ^ 2 + % gx + % g = 0 has one real root: \ n \ tx = % g. \ n ", a, B, c, r1 );Break;Case 2:Printf ("The equation % gx ^ 2 + % gx + % g = 0 has two real roots: \ n \ tx1 = % g, \ tx2 = % g. \ n ", a, B, c, r1, r2 );Break;Case 3:Printf ("The equation % gx ^ 2 + % gx + % g = 0 has an arbitrary solution. \ n", a, B, c );Break;Case 4:Printf ("The equation % gx ^ 2 + % gx + % g = 0 has a

Local Storage-webStorage, storage-webStorage

, even if it was successful for a user in the past. There are multiple reasons why a connection fails. Maybe the User Agent rejects your access for security reasons, maybe the device storage is limited. In the face of active and rapidly evolving potential user agents, it is unwise to make assumptions about users' machines, software and capabilities. For example, when a user uses a handheld device, the data they can freely dispose of may only contain a few megabytes. Execute Query db.transact

iOS Development UI Chapter-uiwindow Brief Introduction

Redcolor];8 9 //let the UIWindow show up (let the window be the main window and show it)Ten //an application can have only one main window One [Self.window makekeyandvisible]; A //let UIWindow become the main window - //[Self.window Makekeywindow]; - the //2. Create a window again -UIWindow *w2 = [[UIWindow alloc] Initwithframe:cgrectmake ( -, -, $, $)]; -W2.backgroundcolor =[Uicolor Yellowcolor]; - [W2 makekeyandvisible]; +SELF.W2 =W2; - + A //3. Create two t

Hibernate optimistic lock and pessimistic lock use

User2 = (TUser) userlist2.get ( 0 );Ten Transaction TX = session.begintransaction (); One Transaction tx2 = session2.begintransaction (); A User2.setusertype ( About ); - Tx2.commit (); - User.setusertype ( 1 ); the Tx.commit (); - Executing the above code, the code throws an staleobjectstateexception exception at Tx.commit () and indicates that the version check failed and that the current transaction i

Cuda on the Windows/linux platform configuration and compilation

Some time ago, the OPENCV3.4,TX2 update source failed to install the TX2, OPENCV internal many functions have implemented GPU acceleration, but we manually write the function, want to through the GPU acceleration will need to manually call Cuda for acceleration. The following describes Cuda's environment configuration and compilation, respectively, from the Windows platform and the Linux platform.1 Windows

The three states of hibernate learning and their life cycle

Three different states:Life cycle:The code indicates: //三种状态publicvoidtestThreeState(){TUser user=newTUser();user.setName("spark"); //此时user处于Transienttry{Transaction tx=session.beginTransaction();session.save(user); //user对象已经由hibernate纳入管理器,处于persistent状态tx.commit();session.close(); //user对象此时为Detached状态,因为与其关联的session已经关闭Transaction tx2=session2.beginTransaction();session2.update(user);//user对象借助session2,由hibernate纳入管理容器,恢复persistent状态

Hibernate optimistic lock and pessimistic lock use

User.setusertype (1); Update Usertype Field7 Tx.commit ();8 Each time we update the Tuser, we can see that the version in the database is incremented. And if we try to start another session before Tx.commit, manipulate the user named Erica to emulate the Concurrency update scenario:Code content1 Session session = GetSession ();2 criteria = Session.createcriteria (TUser. Class);3 Criteria.add (Expression.eq ("name", "Erica"));4 Session session2 = GetSession ();5 Criteria criteria2 = Session2.cre

Implementation of Java pessimistic lock and optimistic lock

criteria2 = Session2. Createcriteria(TUser. Class);Criteria2. Add(Expression. EQ("Name","Erica"));List userlist = Criteria. List();List UserList2 = criteria2. List(); TUser user = (TUser) userlist.get (0);TUser user2 = (TUser) userList2. Get(0);Transaction tx = Session. BeginTransaction();Transaction TX2 = Session2. BeginTransaction();User2. Setusertype( About);Tx2. Commit();User. Setusertype(1);Tx. Commit

Cocos2d sprite Creation

Ccsprite is the most commonly used class. It uses images to display the Sprite on the screen. There are three ways to create the sprite ): // 1. Create a file directly through ccspriteGenie Ccsprite * sprit = [ccsprite spritewithfile: @ "1.jpg"]; Cgsize size = [[ccdirector shareddire] winsize]; Sprit. Position = CCP (size. Width, size. Height ); Sprit. anchorpoint = CCP (1, 1 ); [Self addchild: sprit]; // 2. Use texture to create a genie and store it in the cache Cctexture2d * Tx = [[cctextu

Session save method and cache cleanup in hibernate

customer object becomes a free object. Session session2 = Sessionfactory. opensession (); transaction tx2 = Session2.begintransaction (); session2.save (cutomer ); // In this case, the ID of the customer object is changed to 2. Tx2.commit (); session2.close (); Although the above program code can run normally, there will be two records in the MERs table representing the same business entity, so they do

Application scenarios and scenarios of optimistic locks and pessimistic locks

();Every time we update the TUser, we can find that the version in the database is increasing progressively.If we try to start another Session before tx. commitUser to simulate concurrent updates:Session session = getSession ();Criteria criteria = session. createCriteria (TUser. class );Criteria. add (Expression. eq ("name", "Erica "));Session session2 = getSession ();Criteria criteria2 = session2.createCriteria (TUser. class );Criteria2.add (Expression. eq ("name", "Erica "));List userList = c

Use Oracle's merge and insert all syntax in Java

", "PWD"); preparedstatement sta = Conn. preparestatement (sqlstr); Sta. setint (1, 1); Sta. setstring (2, "New Value"); sta.exe cuteupdate (); Sta. close (); Conn. commit (); Conn. close ();} Similarly, Oracle's insert all syntax supports inserting an SQL statement into multiple tables at a time, for example: Insert all into tx1 values (1000, 1) into tx2 values (2000, 1) Select * from dual; Private Static void testinsertall () throws sqlexception

Optimistic locks and pessimistic locks of Hibernate and Their Applications

. Class );Criteria. Add (expression. eq ("name", "Erica "));Session session2 = getsession ();Criteria criteria2 = session2.createcriteria (Tuser. Class );Criteria2.add (expression. eq ("name", "Erica "));List userlist = criteria. List ();List userlist2 = criteria2.list (); Tuser user = (Tuser) userlist. Get (0 );Tuser user2 = (Tuser) userlist2.get (0 );Transaction Tx = session. begintransaction ();Transaction tx2 = session2.begintransaction ();User2.s

Hibernate Reading Notes ----- optimistic lock and pessimistic lock

= HibernateUtil. getSession ();Transaction tx2 = session2.beginTransaction ();Users users2 = (Users) session2.get (Users. class, 1); // gets the user whose id is 1Users1.getName (). setFirstName ("first name1 ");Users2.getName (). setFirstName ("first name2 ");Tx1.commit (); // ......Tx2.commit (); // .......... 2Session1.close ();Session2.clear ();} Run the above Code. The Code will throw StaleObjectState

Second-level caching and configuration principles

because there is a level two cache Session session2 = hibernateutil.getsession (); Transaction tx2=session2.begintransaction (); Dept dept2 = (Dept) session2.get (dept.class,1); System.out.println (Dept2.getdeptname ()); Tx2.commit (); Hibernateutil.closesession (); }Operation Result:Because there is a

Application scenarios for optimistic locking and pessimistic locking

user's release information, stored in the TUser table'sThe Version field.At this point, if we try to write a piece of code, update the record data in the TUser table, such as:Criteria = Session.createcriteria (Tuser.class);Criteria.add (Expression.eq ("name", "Erica"));List userlist = Criteria.list ();TUser user = (TUser) userlist.get (0);Transaction tx = Session.begintransaction ();User.setusertype (1); Update Usertype FieldTx.commit ();Each time we update the TUser, we can see that the versio

Hibernate optimistic Lock (optimistic Locking)

, two version numbers are the same WuSystem.out.println ("v1=" +stu1.getversion () + "--v2=" +stu2.getversion ()); - AboutTransaction tx1=session1.begintransaction (); $Stu1.setname ("Session1"); - Tx1.commit (); - //at this time, the two version number is different, one of the version number is incremented -System.out.println ("v1=" +stu1.getversion () + "--v2=" +stu2.getversion ()); A +Transaction tx2=session2.begi

iOS Development UI Chapter-uiwindow Brief Introduction

Adding a text input box to the W2Uitextfield *tx2 = [[Uitextfield alloc] Initwithframe:cgrectmake (Ten,Ten, -, +)]; Tx2.borderstyle=Uitextborderstyleroundedrect; [Self.w2 ADDSUBVIEW:TX2]; //get the main window of the applicationNSLog (@"%@", [uiapplication Sharedapplication].keywindow); returnYES;}Code Description: Then create a window (the difference between the main window and the secondary window) l

Android UI development 43rd-use Property Animation to implement moji weather 3.0 guide interface and Animation, androidproperty

= ObjectAnimator. ofFloat (t3_icon2, "translationX", fx1, tx1); transAnimationX2.setDuration (800); transAnimationX2.setRepeatCount (Animation. INFINITE); // Animation. INFINITEtransAnimationX2.setRepeatMode (Animation. RESTART); transAnimationX2.setInterpolator (new LinearInterpolator (); transAnimationY2 = ObjectAnimator. ofFloat (t3_icon2, "translationY", fy1, ty1); transAnimationY2.setDuration (800); transAnimationY2.setRepeatCount (Animation. INFINITE); // Animation. INFINITEtransAnimation

Multi-thread pessimistic lock, optimistic lock, multi-thread

. class ); 6 criteria2.add (Expression. eq ("name", "Erica ")); 7 List userList = criteria. list (); 8 List userList2 = criteria2.list (); TUser user = (TUser) userList. get (0 ); 9 TUser user2 = (TUser) userList2.get (0 ); 10 Transaction tx = session. beginTransaction (); 11 Transaction tx2 = session2.beginTransaction (); 12 user2.setUserType (99 ); 13 tx2.commit (); 14 user. setUserType (1 ); 15 tx. commi

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