Android database example
Manifest File
xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="myapplication.example1.com.hackonlycom"
>
<uses-sdk android:minSdkVersion="15" android:targetSdkVersion="26" />
<uses-permission android:name= "android.permission.SET_WALLPAPER" />
<uses-permission android:name="android.permission.INTERNET"/>
<application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"
>
<activity android:name=".SqlLiteExample">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".HotOrNot" />
<activity android:name=".SQLLiteView" />
</application>
</manifest>
SQLLiteExample.java
package myapplication.example1.com.hackonlycom; import android.app.Activity; import android.app.Dialog; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import myapplication.example1.com.hackonlycom.HotOrNot; public class SqlLiteExample extends Activity implements OnClickListener { Button sqlUpdate, sqlView, sqlModify, sqlGetInfo, sqlDelete; EditText sqlName, sqlHotness, sqlRow; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.sqlliteexample); sqlUpdate=(Button)findViewById(R.id.bSQLUpdate); sqlName=(EditText)findViewById(R.id.etSQLName); sqlHotness=(EditText)findViewById(R.id.etSQLHotness); sqlView=(Button)findViewById(R.id.bSQLOpenView); sqlRow=(EditText) findViewById(R.id.etSQLrawInfo); sqlDelete=(Button)findViewById(R.id.bSQLdelete); sqlModify=(Button)findViewById(R.id.bSQLmodify); sqlGetInfo=(Button)findViewById(R.id.bgetInfo); sqlView.setOnClickListener(this); sqlUpdate.setOnClickListener(this); sqlGetInfo.setOnClickListener(this); sqlModify.setOnClickListener(this); sqlDelete.setOnClickListener(this); } @Override public void onClick(View v){ switch(v.getId()){ case R.id.bSQLUpdate: boolean didItWork = true; try{ String name = sqlName.getText().toString(); String hotness = sqlHotness.getText().toString(); HotOrNot entry= new HotOrNot(SqlLiteExample.this); entry.open(); entry.createEntry(name, hotness); entry.close(); }catch(Exception e){ didItWork = false; String error = e.toString(); Dialog d = new Dialog(this); d.setTitle("Fail"); TextView tv=new TextView(this); tv.setText(error); d.setContentView(tv); d.show(); }finally{ if(didItWork){ Dialog d = new Dialog(this); d.setTitle("done"); TextView tv=new TextView(this); tv.setText("Success"); d.setContentView(tv); d.show(); } } break; case R.id.bSQLOpenView: Intent i= new Intent(this,SQLLiteView.class); startActivity(i); break; case R.id.bgetInfo: String s = sqlRow.getText().toString(); long l = Long.parseLong(s); HotOrNot hon = new HotOrNot(this); hon.open(); String returnedName=hon.getName(l); String returnedHotness=hon.getHotness(l); hon.close(); sqlName.setText(returnedName); sqlHotness.setText(returnedHotness); break; case R.id.bSQLmodify: String mName = sqlName.getText().toString(); String mHotness = sqlHotness.getText().toString(); String sRow = sqlRow.getText().toString(); long lRow = Long.parseLong(sRow); HotOrNot ex = new HotOrNot(this); ex.open(); ex.updateEntry(lRow, mName, mHotness); ex.close(); break; case R.id.bSQLdelete: String sRow1 = sqlRow.getText().toString(); long lRow1 = Long.parseLong(sRow1); HotOrNot ex1 = new HotOrNot(this); ex1.open(); ex1.deleteEntry(lRow1); ex1.close(); break; } } }
HotOrNot.java
package myapplication.example1.com.hackonlycom; /** * Created by AASHISH on 15-04-2017. */ import android.app.Activity; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class HotOrNot extends Activity{ public static final String KEY_ROWID="id"; public static final String KEY_NAME="persons_name"; public static final String KEY_HOTNESS="persons_hotness"; private static final String DATABASE_NAME="HotOrNotdb"; private static final String DATABASE_TABLE="peopleTable"; private static final int DATABASE_VERSION= 2 ; private DbHelper ourHelper; private Context ourContext=null; private SQLiteDatabase ourDatabase; private static class DbHelper extends SQLiteOpenHelper{ public DbHelper(Context context){ super(context, DATABASE_NAME, null,DATABASE_VERSION); } public void onCreate(SQLiteDatabase db)throws SQLException{ db.execSQL("CREATE TABLE "+ DATABASE_TABLE +" ("+KEY_ROWID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+KEY_NAME+" TEXT NOT NULL, "+KEY_HOTNESS+" TEXT NOT NULL);"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub db.execSQL("DROP TABLE IF EXISTS "+DATABASE_TABLE); onCreate(db); } } public HotOrNot(){ } public HotOrNot(Context c){ ourContext = c; } public HotOrNot open(){ ourHelper=new DbHelper(ourContext); ourDatabase=ourHelper.getWritableDatabase(); return this; } public void close(){ ourHelper.close(); } public long createEntry(String name, String hotness)throws SQLException{ ContentValues cv = new ContentValues(); cv.put(KEY_NAME, name); cv.put(KEY_HOTNESS, hotness); return ourDatabase.insert(DATABASE_TABLE, null, cv); } public String getData()throws SQLException{ String[] columns = new String[]{KEY_ROWID, KEY_NAME, KEY_HOTNESS}; Cursor c= ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null); String result = ""; int iRow = c.getColumnIndex(KEY_ROWID); int iName = c.getColumnIndex(KEY_NAME); int iHotness = c.getColumnIndex(KEY_HOTNESS); for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){ result = result + c.getString(iRow)+ " " + c.getString(iName) + " " + c.getString(iHotness)+"\n"; } return result; } public String getName(long l){ String[] columns = new String[]{KEY_ROWID, KEY_NAME, KEY_HOTNESS}; Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + " = " + l, null, null, null, null); if(c!=null){ c.moveToFirst(); String name = c.getString(1); return name; } return null; } public String getHotness(long l){ String[] columns = new String[]{KEY_ROWID, KEY_NAME, KEY_HOTNESS}; Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + " = " + l, null, null, null, null); if(c!=null){ c.moveToFirst(); String hotness=c.getString(2); return hotness; } return null; } public void updateEntry (long lRow, String mName, String mHotness) throws SQLException{ // TODO Auto-generated method stub ContentValues cvUpdate = new ContentValues(); cvUpdate.put(KEY_NAME, mName); cvUpdate.put(KEY_HOTNESS, mHotness); ourDatabase.update(DATABASE_TABLE, cvUpdate, KEY_ROWID + "=" + lRow, null); } public void deleteEntry(long lRow1) throws SQLException { // TODO Auto-generated method stub ourDatabase.delete(DATABASE_TABLE, KEY_ROWID + "="+lRow1, null); } }SQLLiteView.javapackage myapplication.example1.com.hackonlycom; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; import myapplication.example1.com.hackonlycom.HotOrNot; public class SQLLiteView extends Activity{ @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.sqlview); TextView tv = (TextView)findViewById(R.id.tvSQLinfo); HotOrNot info = new HotOrNot(this); info.open(); String data = info.getData(); info.close(); tv.setText(data); } }sqlview.xmlxml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:weightSum="1"> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="40sp" android:text="Names" android:layout_weight="0.15" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hotness" android:layout_weight="0.27" /> <TextView android:id="@+id/tvSQLinfo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="0.34" /> </LinearLayout>sqlliteexample.xmlxml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/textView1" android:layout_width="match_parent" android:layout_height="30sp" android:text="Name" /> <EditText android:id="@+id/etSQLName" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" android:hint="Enter Name"> <requestFocus /> </EditText> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="30sp" android:text="Hotness Scale" /> <EditText android:id="@+id/etSQLHotness" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" /> <Button android:id="@+id/bSQLUpdate" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Update SQLite Database" /> <Button android:id="@+id/bSQLOpenView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="View" /> <TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Enter Row ID" /> <EditText android:id="@+id/etSQLrawInfo" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" android:inputType="number" /> <Button android:id="@+id/bgetInfo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Get Info" /> <Button android:id="@+id/bSQLmodify" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Edit" /> <Button android:id="@+id/bSQLdelete" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Delete" /> </LinearLayout>
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