java - How to verify whether a record with certain field values exists in a DB with JPA? -

-

जेपीए के साथ मौजूद खंड को कैसे व्यक्त किया जाए?

पहले (हम ओरेकल पर हैं और एक डुएल तालिका है): 

  @Entity () @Table (नाम = "DUAL") @ReadOnly सार्वजनिक कक्षा दोहरी {@Id स्ट्रिंग डमी; सार्वजनिक स्ट्रिंग getDummy () {वापसी डमी; }}

तब: 

  मानदंडबिल्डर सीबी = em.getCriteriaBuilder (); CriteriaQuery & LT; दोहरी & gt; Cq = cb.createQuery (Dual.class); सबक्वेरी & LT; ProtokollSatz & gt; Sq = cq.subquery (ProtokollSatz.class); रूट के & lt; ProtokollSatz & gt; Root1 = sq.from (प्रोटोकॉल्स्त्स्। वर्ग); Sq.where (cb.and (cb.equal (root1। & Lt; पूर्णांक & gt; मिल ("फ़ील्ड 1"), पूर्णांक.वल्यूओफ़ (फ़ील्ड 1)), सीबी.एम्बल (रूट 1। & Lt; पूर्णांक & gt; मिल ("फ़ील्ड 2"), Integer.valueOf (field2)))); cq.where (cb.exists (वर्ग)); TypedQuery & LT; दोहरी & gt; क्वेरी = em.createQuery (cq); बूलियन ifExists = query.getResultList ()। आकार () & gt; 0;

आप प्राप्त करते हैं: 

  SELECT t0.DUMMY से दोहरी टी 0 जहां मौजूद है (चुनें? PROTOKOLL_SAETZE T1 WHERE से ((t1.FIELD1 =?) और ( T1.FIELD2 =?)))

एक्लिपसेलिंक के साथ परीक्षण किया गया।


Comments

Post a Comment

Popular posts from this blog

c# - sqlDecimal to decimal clr stored procedure Unable to cast object of type 'System.Data.SqlTypes.SqlDecimal' to type 'System.IConvertible' -

-
I'm new to this I'm writing a clr. stored procedure that can be used to get values ​​used in a calculation Call for another stored procedure for Gives an archived methodology int (I think SqlInt32? Value of the table's value is int) which is then necessary to convert to decimal. Here I have the code: Public static integral mood (SQL MDMMYLUE, escalistering AMY type, out of SQLDCM Result) {aResult = 0; Try {SqlConnection conn = New SqlConnection ("Reference Connection = True"); SqlCommand cmd = New SqlCommand ("sp_GetType", conn); Cmd.Parameters.AddWithValue ("@ myValueType", aMyValueType); Cmd.CommandType = CommandType.StoredProcedure; Conn.Open (); Object type = CMD. Exclamation Asser (); Conn.Close (); Decimal type FORCalculation = Convert. ToDecimal (type); Decimal value = convert toDecimal (aMyValue); // ** calculation calc = new calculation (); Decimal result = calorie.docalulation (typefarculation, value); I get an exception...
Read more

Calling GetGUIThreadInfo from Outlook VBA -

-
I need to find the active window'm writing a VBA macro in MS Outlook, which is a specific process. The goal of this is to get the active window / document name even if its original application has more than one document interface. User processor with GetCurrentThreadId is active, I am using GetGUIThreadInfo to get .dll. Here is the correct code: private type RECT as as Left LongPtr top LongPtr right LongPtr down LongPtr termination of private type GUITHREADINFO cbSize as LongPtr flags LongPtr hwndActive LongPtr hwndFocus LongPtr hwndCapture LongPtr as as as as as reset as LongPtr rcCaret as LongPtr hwndCreate as LongPtr hwndMoveSize as HwndMenuOwner end of Private Equity PtrSafe function GetWindowThreadProcessId Lib "user32" (_BVV hnw LongPtr as LongPtr Nig Mr. announced as PtrSafe function GetGUIThreadInfo Lib "user32" _ (ByVal dwthreadid as LongPtr, _ lpguithreadinfo as GUITHREADINFO) LongPtr Sub MyFunction () as dim strWindowTitle string = space as s...
Read more

Obfuscating Python code? -

-
I'm looking for a way to hide my Python source code. print "Hello World!" How can I encode this example so that it is not human-readable? I have been asked to use Base 64 but I'm not sure how. itemprop = "text"> It is limited only, first level ambiguous resolution, but has built-in: byte-code in Python Is a compiler for: dragon-o-m py_compile & lt; Your program.py & gt; creates a .pyo file with a byte-code, and where the docstrings are removed, etc. You can rename .pyo with the .py extension, and python & lt; Your program.py & gt; runs as your program, but it does not have your source code. PS : If your program blur modules like this, you need to rename them with the .pyc suffix (I Not sure it will not break a day), or you can work with .pyo and run them with python -o ... .pyo ( Import should work). This will allow dragon to search your modules (otherwise, Python looks for the .py module).
Read more