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
, 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
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
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
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
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
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
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
();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
", "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
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
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
, 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
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
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