SQLIte Database Take Two

I wanted to redo the database in the simplest way possible to make things clearer. To do this I made a simple initial form with two buttons:

I still needed to create the sqlHelper class. But this time I only created a single table. Here is the code for the SqlHelperClass

package com.spconger.programmingresourcesdata;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;


public class SqlHelperClass extends SQLiteOpenHelper{

 /*
  * This class extends SqlLiteOpenHelper
  * It creates the database and the tables
  * and sets static constants that are used
  * in the other classes
  */
 
 //set database as priiate constatn
 private static final String DATABASE_NAME = "ProgramResources.db";
 private static final int DATABASE_VERSION = 1;
 
 //public constants
 //database table
 public static final String TABLE_NAME="Book";
 
 //columns
 public static final String BOOK_ID="bookId";
 public static final String BOOK_TITLE="title";
 public static final String BOOK_AUTHOR="author";
 public static final String BOOK_RATING="Rating";
 
 //required constructor
 //takes the contest which is usually the current 
 //activity, it also passes the database name and
 //version to the super class
 public SqlHelperClass(Context context) {
  super(context, DATABASE_NAME, null, DATABASE_VERSION);
  // TODO Auto-generated constructor stub
 }

 @Override
 public void onCreate(SQLiteDatabase db) {
  // here we create the table
  String sql_Book="CREATE TABLE " + TABLE_NAME
  +"(" + BOOK_ID + " integer primary key autoincrement, " 
  + BOOK_TITLE + " text not null, "
  + BOOK_AUTHOR + " text not null, "
  + BOOK_RATING + " int, "
  + "unique (" +BOOK_TITLE + "))";
  
  //add the table to the database
  db.execSQL(sql_Book);
 }

 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
  //You should put code here to handle new versions of the database
  
 }

}

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Here is the form for adding records

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The java behind this form is fairly straight forward. I just initialize a writable database, get the values from the EditText controls and insert them into the database

package com.spconger.programmingresourcesdata;



import android.app.Activity;
import android.content.ContentValues;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class AddRecordsActivity extends Activity{
 /*
  * This activity adds records to the database. 
  * I purposefully kept this simple
  * not breaking it into too many methods
  * Consequently the AddRecord method does 
  * more than it probably should
  */
 EditText txtTitle;
 EditText txtAuthor;
 EditText txtRating;
 Button btnSave;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.addrecords);
  
  btnSave = (Button)findViewById(R.id.button1);
  btnSave.setOnClickListener(new AddRecordListener());
 }
 
 private class AddRecordListener implements View.OnClickListener{

  @Override
  public void onClick(View v) {
   
   //get database
   SqlHelperClass sqlHelper = new SqlHelperClass(AddRecordsActivity.this);
   SQLiteDatabase db= sqlHelper.getWritableDatabase();
   
   //get the values from the EditText controls
   
   txtTitle = (EditText)findViewById(R.id.editTextTitle);
   String title=txtTitle.getText().toString();
   
   txtAuthor=(EditText)findViewById(R.id.editTextAuthor);
   String author=txtAuthor.getText().toString();
   
   txtRating = (EditText)findViewById(R.id.editTextRating);
   String ratingString=txtRating.getText().toString();
   int rating=Integer.parseInt(ratingString);
   
   //add the values from the EditViews to the columns
   ContentValues values = new ContentValues();
   values.put(SqlHelperClass.BOOK_TITLE,title);
   values.put(SqlHelperClass.BOOK_AUTHOR, author);
   values.put(SqlHelperClass.BOOK_RATING, rating);
   
   
   //Insert into the database
   long book_id= db.insert(SqlHelperClass.TABLE_NAME, null, values);
   db.close();
   
   //if the insert is successful
   if(book_id != -1)
   {
    //start a toast (a message)
    Toast toast = Toast.makeText
       (AddRecordsActivity.this, "Record Added", Toast.LENGTH_LONG);
    toast.show();
   }
   else
   {
    Toast toast = Toast.makeText
      (AddRecordsActivity.this, "Record failed to Insert", Toast.LENGTH_LONG);
             toast.show();
   }
            
   //clear for next record
            clearForm();
   
   
   }
   
  }
  
  private void clearForm()
  {
   txtTitle.setText("");
   txtAuthor.setText("");
   txtRating.setText("");
  }
  }
  

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finally we just view the records. I didn't do anything fancy. I created a cursor to look through the records and appended them to a string that terminates with a new line character. Then I set the resulting text to the ViewText. Here is the codeL

package com.spconger.programmingresourcesdata;

import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.widget.TextView;


public class ViewRecordsActivity extends Activity{
 
 /*
  * Again, to make this simple, the getRecords method
  * does more than one record should do
  * 
  */
 @Override
  protected void onCreate(Bundle savedInstanceState) {
 // TODO Auto-generated method stub
 super.onCreate(savedInstanceState);
 setContentView(R.layout.viewrecords);
 
 getRecords();
 }
 
 private void getRecords(){
  
  //initiate the SqlHeperClass and get the database
  SqlHelperClass sqlHelper = new SqlHelperClass(ViewRecordsActivity.this);
  SQLiteDatabase db= sqlHelper.getWritableDatabase();
  
  //create an array of the columns
  String[] columns = new String[] 
         {sqlHelper.BOOK_TITLE, 
    sqlHelper.BOOK_AUTHOR, 
    sqlHelper.BOOK_RATING};
  
  //start a cursor to move through the records
  Cursor cursor = db.query(sqlHelper.TABLE_NAME, columns, null, null, null, null, null);
  
  String result="";
  //use the cursor to loop through the records
  for(cursor.moveToFirst();!cursor.isAfterLast();cursor.moveToNext()){
   //I am just concatenating the records into a string
   //terminated by a line break
   result+= cursor.getString(0) + ", " + cursor.getString(1) + "--" + cursor.getInt(2) + "\n" ;
  }
  
  //assign the result to the textview
  TextView content=(TextView)findViewById(R.id.content_list);
  content.setText(result);
 }
}

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Here is the the activity running