Databases
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POi cannot add date value in to SQLite database it is showing error in the catalog ...please suggest the correct method
 

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  1. POi cannot add date value in to SQLite database it is showing error in the catalog ...please suggest the correct method
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    <p>My application has a MainActivity and a Database Helpler class.</p> <p>MainActivity</p> <pre><code>package com.example.sample; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import android.os.Bundle; import android.app.Activity; import android.database.sqlite.SQLiteDatabase; import android.text.format.DateFormat; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends Activity{ Button b1; EditText et1; protected DatabaseHelper helper; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); helper=new DatabaseHelper(this); b1=(Button)findViewById(R.id.button1); et1=(EditText)findViewById(R.id.editText1); b1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub SimpleDateFormat formatter=new SimpleDateFormat("dd/MM/yyyy"); Date dateobject; String date_var=(et1.getText().toString()); try { dateobject=formatter.parse(date_var); String date=new SimpleDateFormat().format(dateobject); helper.AddDetail(date); Toast.makeText(getApplicationContext(),""+date, Toast.LENGTH_SHORT).show(); helper.close(); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); } } </code></pre> <p>DatabaseHelper Class is defined below</p> <pre><code> package com.example.sample; import android.content.ContentValues; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteDatabase.CursorFactory; import android.database.sqlite.SQLiteOpenHelper; public class DatabaseHelper extends SQLiteOpenHelper { DatabaseHelper helper; SQLiteDatabase db; static final int VERSION=2; static final String DATA_NAME="Mydata"; Context c; public DatabaseHelper(Context context) { super(context, DATA_NAME, null, VERSION); c=context; // TODO Auto-generated constructor stub } @Override public void onCreate(SQLiteDatabase arg0) { // TODO Auto-generated method stub String query="create table if not exists Mytable(id Integer primary key,Daate text not null)"; db.execSQL(query); } public long AddDetail(String date) { db=getWritableDatabase(); ContentValues vals=new ContentValues(); vals.put("Daate",date); long a=db.insert("Mytable", null, vals); db.close(); return a; } @Override public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) { // TODO Auto-generated method stub } } </code></pre> <p>It is showing an error at the line <strong>db.execSQL(query);</strong> in the Database Helper Class(defined below) and at the line <strong>helper.AddDetail(date);</strong> inside the MainActivity. The Logcat is shown below</p> <pre><code> 09-03 16:51:22.481: E/AndroidRuntime(3240): FATAL EXCEPTION: main 09-03 16:51:22.481: E/AndroidRuntime(3240): java.lang.NullPointerException 09-03 16:51:22.481: E/AndroidRuntime(3240): at com.example.sample.DatabaseHelper.onCreate(DatabaseHelper.java:27) 09-03 16:51:22.481: E/AndroidRuntime(3240): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252) 09-03 16:51:22.481: E/AndroidRuntime(3240): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164) 09-03 16:51:22.481: E/AndroidRuntime(3240): at com.example.sample.DatabaseHelper.AddDetail(DatabaseHelper.java:31) 09-03 16:51:22.481: E/AndroidRuntime(3240): at com.example.sample.MainActivity$1.onClick(MainActivity.java:48) 09-03 16:51:22.481: E/AndroidRuntime(3240): at android.view.View.performClick(View.java:4204) 09-03 16:51:22.481: E/AndroidRuntime(3240): at android.view.View$PerformClick.run(View.java:17355) 09-03 16:51:22.481: E/AndroidRuntime(3240): at android.os.Handler.handleCallback(Handler.java:725) 09-03 16:51:22.481: E/AndroidRuntime(3240): at android.os.Handler.dispatchMessage(Handler.java:92) 09-03 16:51:22.481: E/AndroidRuntime(3240): at android.os.Looper.loop(Looper.java:137) 09-03 16:51:22.481: E/AndroidRuntime(3240): at android.app.ActivityThread.main(ActivityThread.java:5041) 09-03 16:51:22.481: E/AndroidRuntime(3240): at java.lang.reflect.Method.invokeNative(Native Method) 09-03 16:51:22.481: E/AndroidRuntime(3240): at java.lang.reflect.Method.invoke(Method.java:511) 09-03 16:51:22.481: E/AndroidRuntime(3240): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 09-03 16:51:22.481: E/AndroidRuntime(3240): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 09-03 16:51:22.481: E/AndroidRuntime(3240): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. UStanay tandon
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