c# - Getting a NullpointerException on my code -

-

मुझे इस कोड पर एक Nullpointer मिल रहा है: 

  सार्वजनिक शून्य InsertImportantMsg (स्ट्रिंग msg, डेटटाइम टूडे, इंट दृश्य) {connection.Open (); स्ट्रिंग क्वेरी = "अपडेट करें IMPORTANTMESSAGE SET MESSAGES = ': msg', DATETIME = ': toDay'," + "LABELVISIBILITY = ': दृश्यमान'"; Connection.CreateCommand (); Cmd.CommandText = query; Cmd.Parameters.Add (": msg", msg); Cmd.Parameters.Add (": toDay", आज); Cmd.Parameters.Add (": दिखाई", दृश्यमान); Cmd.ExecuteNonQuery (); }

विशेष रूप से इस रेखा पर: 

  cmd.CommandText = query;

मैं पैरामीटर सही पास कर रहा हूँ क्या मेरे अपडेट स्टेटमेंट में कुछ गड़बड़ है, मुझे पता नहीं है?

(मुझे पता है कि कोड को पकड़ने की कोशिश में होना चाहिए, लेकिन यह अभी भी उद्देश्य पर है, इसलिए इसे न देखें) < / P>

धन्यवाद

अपवाद का तत्काल कारण यह है कि आप haven ' टी असाइन किया गया सीएमडी मान। कार्यान्वयन ऐसा हो सकता है कि 

  सार्वजनिक शून्य InsertImportantMsg (स्ट्रिंग msg, दिनांकटाइम toDay, int दृश्यमान) {connection.Open (); // उपयोग करने में IDisposable रखें ... (var cmd = connection.CreateCommand ()) {// पढ़ने योग्य सीएमडी के लिए क्वेरी की क्वेरी करें। कॉमांड टेक्स्ट = @ "अद्यतन IMPORTANTMESSAGE SET MESSAGES =: msg, - & lt; - आप डॉन ' टी यहाँ apostrophes की जरूरत है ... DATETIME =: toDay, LABELVISIBILITY =: दृश्यमान "; Cmd.Parameters.Add (": msg", msg); Cmd.Parameters.Add (": toDay", आज); // TODO: यह चेक करें - ओरेकल बूलीयन का समर्थन नहीं करता है SQL cmd.Parameters.Add (": दिखाई", दृश्यमान); cmd.ExecuteNonQuery (); }}

Comments

Post a Comment

Popular posts from this blog

java - Can't add JTree to JPanel of a JInternalFrame -

-
Image
There are two panels in my JInternalframe. I want to add TopPanel to Jtree to nominate another. But I can not add Jaitari to the top of the panel. Please help me in this piece of code: DefaultMutableTreeNode root = new DefaultMutableTreeNode ("deck"); DefaultMutableTreeNode Item Clubs = New DefaultMutableTreeNode ("Club"); AddAllCard (itemClubs); Root.add (itemClubs); DefaultMutableTreeNode item = New DefaultMutableTreeNode ("Diamonds"); AddAllCard (itemDiamonds); Root.add (itemDiamonds); DefaultMutableTreeNode Itemspads = New DefaultMutableTreeNode ("Spades"); AddAllCard (itemSpades); Root.add (itemSpades); DefaultMutableTreeNode item increases = new DefaultMutableTreeNode ("heart"); AddAllCard (itemHearts); Root.add (itemHearts); Default Trimodel Tree Model = New DefaultTreeModel (Route); Tree = new jetty (tree modal); ScrollPane = new JScrollPane (tree); // scrollPane.setViewportView (tree); . ScrollPane.getViewport () add (tr...
Read more

python - Calculate STD manually using Groupby Pandas DataFrame -

-
Image
I was trying to write a solution, which is a different and a manual for calculating a mean and STD The way. I have created a = ["Apple", "Banana", "Cherry", "Apple"] B = [3,4,7,3] C = [5,4,1,4] D = [7,8,3,7] Pd DF = PD to import pandals DataFrame (index = class (4), column = list ("ABCD")) DF ["A"] = A DF ["B"] = BDF ["C"] = C DF ["D"] = D Again, I made a list of A duplication. Then I went through the group all the time of the objects and calculated the solution. import as np l = list (set (df.A)) df.groupby ('A', As_index = False) listMean = [0] * len (df.C) ListSTD = [0] * L in the LAN (df.C) X: s = np.mean (df [df ['A'] == x] for C =.) = Z = [index for index, enumerate In the object (df ['a']. Value] x == item i for z: listMean [i] = s in: s = np.std (df [df ['a'] == X] .cvalues) z = index for index, enumerate item (df ['a']. Value) if x ==...
Read more

java - @PluginTarget(Node.class) not registering as neo4j plugin -

-
Simple class below will not show as a plugin package com.danmacias neoneoteplugin ; Import java.util.ArrayList; Import java.util.list; Import org.neo4j.graphdb. *; Import org.neo4j.server.plugins *; Import org.neo4j.graphalgo *; // import org.neo4j.tooling.GlobalGraphOperations; @ Description (expansion of Neo4j server to achieve all nodes or relationships) Public class GetPaths expanded the server plugin {@ name ("breadth_first_paths") @ Description ("first wide travel traversal of specific node"). @plugin target (node ​​class) public shaky & lt; Path & gt; GetPaths (@ Source Node Graphidi) {ArrayList & lt; Path & gt; Path = new arreelist & lt; & Gt; (); Return path; }} curl return {"extension": {"GetAll": {"get_all_nodes": "http: // localhost: 7474 / db / ext / GetAll / graphdb / get_all_nodes "} ...}, But when I Node.class both conditions GraphDatabaseService I change with Class ,...
Read more