Java Createstatement Error
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Public Static Void Viewtable() Throws Sqlexception Statement Stmt=null
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Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up nullpointer exception on statement what statements are correct about batched insert and updates = conn.createStatement(); up vote 0 down vote favorite I am using jdbc in android (Aware not recomended) I have following piece of code: public int CheckUser(String uName,String password) { try { String sql="select uid from UserMaster where username='"+uName+"' and password='"+password+"'"; statement = conn.createStatement(); resultSet = statement.executeQuery(sql); int value=0; if (resultSet.next()) { value=resultSet.getInt(1); } return value; } catch (Exception e) { e.printStackTrace(); return 0; } } I gets null pointer exception on statement = conn.createStatement(); Logcat: 09-12 11:04:14.543: W/KeyCharacterMap(483): No keyboard for id 0 09-12 11:04:14.553: W/KeyCharacterMap(483): Using default keymap: /system/usr/keychars/qwerty.kcm.bin 09-12 11:04:51.173: W/System.err(483): java.lang.NullPointerException 09-12 11:04:51.194: W/System.err(483): at com.example.messagesql.gaSQLConnect.CheckUser(gaSQLConnect.java:69) 09-12 11:04:51.213: W/System.err(483): at com.example.messagesql.Login$UserLogin.doInBackground(Login.java:109) 09-12 11:04:51.213: W/System.err(483): at com.example.messagesql.Login$UserLogin.doInBackground(Login.java:1) 09-12 11:04:51.225: W/System.err(483): at android.os.AsyncTask$2.call(AsyncTask.java:185) 09-12 11:04:51.233: W/System.err(483): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 09-12 11:04:51.233: W/System.err(483): at java.util.concurrent.FutureTask.run(FutureTask.java:138) 09-12 11:04:51.253: W/System.err(483): at java.util.concurrent.ThreadPoolExecutor.runWor
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Which Type Of Driver Converts Jdbc Calls Into Network Protocol
the workings and policies of this site About Us Learn more what is statement and resultset in jdbc about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow what is in terms of jdbc a datasource Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping http://stackoverflow.com/questions/18756159/nullpointer-exception-on-statement-conn-createstatement each other. Join them; it only takes a minute: Sign up Null Pointer Exception at Statement stmt = conn.CreateStatement. Am new to this, I cannot find a solution? up vote -2 down vote favorite The idea of this program is to connect to a database, using a graphical interface that gives the user options to to alter or http://stackoverflow.com/questions/22863357/null-pointer-exception-at-statement-stmt-conn-createstatement-am-new-to-this update the database. It starts with the DriverManager connection, and methods are written to be called by JRadioButton options (Yes I am aware it is an unusual use of radio buttons). The GUI calls on the methods, but from these methods, despite creating the connection through driver manager, there seems to be a null pointer exception through conn still. I would be very grateful if someone could explain to me why this is still pointing to a null, rather than the DriverManager.getConnection? Thanks. public Connection getConnection() throws SQLException { try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost/Uni", "resit", "summer1"); } catch (Exception e) { System.err.println(e.getMessage()); e.printStackTrace(); System.exit(1); } return conn; } public static void main(String args[]) { GUI works fine alone, but does not seem to connect to the database through the DriverManager Connection. Query myGUI = new Query(); } private static void insertLecturer() throws SQLException { String a = JOptionPane.showInputDialog("Insert: LID"); String b = JOptionPane.showInputDialog("Insert FirstName"); String c = JOptionPane.showInputDialog("Insert LastName"); String d = JOptionPane.showInputDialog("Insert Salary"); This line (below) is pointing to
Speaker BureauLog inRegisterSearchSearchCancelError: You don't have JavaScript enabled. This tool uses JavaScript and much of it will not work correctly without it enabled. Please turn JavaScript back on and reload this page. https://community.oracle.com/thread/1223858 Please enter a title. You can not post a blank message. Please type your message and try again. More discussions in New To Java All PlacesJavaJava EssentialsNew http://www.java2s.com/Code/JavaAPI/java.sql/ConnectioncreateStatement.htm To Java This discussion is archived 12 Replies Latest reply on Sep 25, 2006 12:22 AM by 796254 JDBC error 807598 Sep 9, 2006 5:59 PM Hi, i what is have the following code:: import java.sql.*; import java.sql.SQLException; import java.io.*; import java.sql.Connection; import java.sql.DatabaseMetaData; import java.sql.ResultSet; import java.sql.DriverManager; import java.sql.Statement; import java.util.*; class TestMyDB { public static void main(String[] args) { try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection conn = DriverManager.getConnection("jdbc:odbc:NB123","",""); //NB123 is my DSN name. Statement stmt = stmt.createStatement(); ResultSet rs = stmt.exeuteQuery("Select name from Transaction"); while(rs!=null) java createstatement error { String s = rs.getString("name"); System.out.println(s); } } catch (SQLException e) { e.printStackTrace(); } catch(Exception e) { e.printStackTrace(); } } }I am getting the following errors:: C:\>javac TestMyDB.java TestMyDB.java:22: cannot find symbol symbol : method createStatement() location: interface java.sql.Statement Statement stmt = stmt.createStatement(); ^ TestMyDB.java:23: cannot find symbol symbol : method exeuteQuery(java.lang.String) location: interface java.sql.Statement ResultSet rs = stmt.exeuteQuery("Select name from Transa ction"); ^ 2 errors 706Views Tags: none (add) This content has been marked as final. Show 12 replies 1. Re: JDBC error 800322 Sep 9, 2006 6:05 PM (in response to 807598) Statement stmt = stmt.createStatement();Oh come on - do you actually know what you're doing? You shouldn't be programming JDBC if you try something like that, and can't even resolve those errors. By the way, it's the Connection that can create Statements. Not the statement instance you want to create. exeuteQueryHint: c Like Show 0 Likes(0) Actions 2. Re: JDBC error 796254 Sep 9, 2006 6:06 PM (i