java - mybatis - insert transaction -

-

सम्मिलित करने के लिए

मेबाटिस मैपर कोड: 

  & lt; insert id = "insert" parameterType = "शॉप" का उपयोग करें GeneratedKeys = "true" & gt; (# {Email}, # {pswd}, # {उपनाम}, # {मोबाइल}, # {शहर}, # {createDate} के लिए दुकान (ई-मेल, पीएसडब्ल्यूडी, उपनाम, मोबाइल, शहर, # {Status}) & lt; का चयन करें मुख्य कुंजी = "id" क्रम = "बाद में" परिणामस्वरूप = "लंबा" & gt; चुराने का चयन करें ('shop_id_seq') & lt; / select key & gt; & Lt; / डालने & gt;

डेटाबेस postgresql 9.3 है।

मेरा संदेह है: बिना किसी अंतर लेनदेन, जब मैं आईडी को क्रम से क्ररवल का चयन करें ('दुकान_आईडी_एसएक्') , क्या अन्य थ्रेड भी सम्मिलित कर रहे हैं, तो क्या गलत मान प्राप्त करना संभव है?

मैंने सोचा था कि नहीं, क्योंकि currval () फ़ंक्शन संदर्भ में चलता है वर्तमान सत्र का, वैश्विक सत्र नहीं, लेकिन मैं यह सुनिश्चित नहीं हूं।

के अनुसार, अनुक्रम फ़ंक्शन curvval :

वर्तमान सत्र में इस अनुक्रम के लिए सबसे हाल ही में प्राप्त किए गए मान लौटें nextval । (यदि इस सत्र में इस क्रम के लिए अग्रिम को कभी कॉल नहीं किया गया है तो एक त्रुटि की सूचना है।) क्योंकि यह एक सत्र-स्थानीय मान लौटा रहा है, यह एक पूर्वानुमान लगाता है

तो आपको सही मूल्य मिल जाएगा दूसरे तरीके से, अनुक्रम गैर-व्यवहारिक हैं प्रत्येक सत्र को एक अलग क्रम मान मिलता है। अनुक्रम में परिवर्तन को पूर्ववत नहीं किया जा सकता।


Comments

Post a Comment

Popular posts from this blog

java - org.apache.http.ProtocolException: Target host is not specified -

-
I have written a simple httprequest / response code and I am getting this error below: I used to type in my classpath httpclient, httpcore, common -Codecs and general logging. I am very new to Java and I do not know what's going on here. Please help me. code: import org.apache.http.client.HttpClient; Import org.apache.http.client.methods.HttpGet; Import org.apache.http.HttpResponse; Import org.apache.http.impl.client.HttpClientBuilder; Import org.apache.http.Header; Import org.apache.http.HttpHeaders; Public class UnshorteningUrl {public static zero main (string [] args throws exception {HttpGet request = zero; HTTP Client Client = HTTP ClientBuilder.credit (). Build (); Try {Request = New HTTP Gate ("trib.me/1lBFzSi"); HttpResponse httpResponse = client.execute (request); Header [] header = httpResponse.getHeaders (HttpHeaders.LOCATION); // Preconditions.checkState (headers.length == 1); String new url = header [0] .getValue (); System.out.println ("new url...
Read more

How to access user directory in lazarus? -

-
After I am trying to open file changelog.txt and it does not matter if I open it Need to have the user open it though it is always located in the ~ / directory. Enter the file here. Here is my code: Process TForm1.FormCreate (From: TObject); Var myFile: textfile; Line: String; Start AssignFile (myFile, '~ / changelog.txt'); Reset (myFile); While EOF (MyFile) does not readLn (myFile, Line); Label3.Caption: = (Label3.Capttion + Line + # 13 # 10); End; CloseFile (myFile); End; This does not work, however, if I replace ~ with the actual user name, then it works, however, I use the username of each user Can not know which will run my program. Any idea how can I get the username that started the program? ! Thanks Edit1: I have tried this, but this also includes a new line: RunCommand ('/ bin / bash', ['- - C ',' Whoami '], users); This is normal. The concept of "~" is an shell level and thus requires a separate shell elev...
Read more

java - Gradle dependencies: compile project by relative path -

-
Is it possible to specify a dependency on another gradeal project in the granular (in android studios) outside the current project limits? For example, with a relative path like this: dependence {collection project ('../../ stdlib / dagger'}} MyApp (path / user / foo / workspace / mypad) The app (Path / User / Foo / Workspace / MyPass / App) And I have an Android Library Project with 3 subdomules: stdlib (path is / user / foo / Utilities (Path / User / Foo / Workspace / Stadlib / Utilis) http (Path / User / Foo / Workspace / Stadlib / HT) / Li> What I have to do is compile the Dagger, Util, http module in the MyApp project. The Stidelib Library module under heavy development And MyApp will grow in the form of Growth, so I do not want to push them into a Mewen repository. I am a little change. is likely to add another Gredle projects in some way? I will push the study library into the Maven repository after the source is in search of a temp...
Read more