DBTextAdapter.java :  » Blog-Twitter » androblogger » com » sadko » androblogger » db » Android Open Source

package com.sadko.androblogger.db;

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;
//import android.util.Log;

public class DBTextAdapter {

  public static final String KEY_ROWID = "_id";
  public static final String KEY_TITLE = "title";
  public static final String KEY_CONTENT = "content";

  // private static final String TAG = "DBTextAdapter";
  private DBTextHelper mDbHelper;
  private SQLiteDatabase mDb;
  private static final String DATABASE_NAME = "text.db";
  private static final String DATABASE_TABLE = "post";
  private static final int DATABASE_VERSION = 1;
  private static final String DATABASE_CREATE = "create table post (_id integer primary key autoincrement, "
      + "title text not null, content text not null);";
  private final Context mCtx;

  private static class DBTextHelper extends SQLiteOpenHelper {

    DBTextHelper(Context context) {
      super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
      db.execSQL(DATABASE_CREATE);
      // Log.i(TAG, "DB '" + DATABASE_NAME + "' successfuly created");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
      // Log.w(TAG, "Upgrading database from version " + oldVersion +
      // " to "+ newVersion + ", which will destroy all old data");
      db.execSQL("DROP TABLE IF EXISTS post");
      onCreate(db);
    }
  }

  public DBTextAdapter(Context ctx) {
    this.mCtx = ctx;
  }

  public DBTextAdapter open() throws SQLException {
    mDbHelper = new DBTextHelper(mCtx);
    mDb = mDbHelper.getWritableDatabase();
    return this;
  }

  public void close() {
    mDbHelper.close();
  }

  public long createPost(String title, String content) throws SQLException {
    ContentValues initialValues = new ContentValues();
    initialValues.put(KEY_TITLE, title);
    initialValues.put(KEY_CONTENT, content);
    // Log.i(TAG, "Title: '" + title + "', content: '" + content+
    // "' successfuly inserted");
    return mDb.insert(DATABASE_TABLE, null, initialValues);
  }

  public boolean deletePost(long rowId) {
    return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
  }

  public Cursor fetchAllPosts() {
    return mDb.query(DATABASE_TABLE, new String[]{KEY_ROWID, KEY_TITLE,
        KEY_CONTENT}, null, null, null, null, null);
  }

  public Cursor fetchPostdById(long rowId) throws SQLException {
    Cursor mCursor = mDb.query(true, DATABASE_TABLE, new String[]{
        KEY_ROWID, KEY_TITLE, KEY_CONTENT}, KEY_ROWID + "=" + rowId,
        null, null, null, null, null);
    if (mCursor != null) {
      mCursor.moveToFirst();
    }
    return mCursor;
  }

  public boolean updatePostById(long rowId, String title, String conten)
      throws SQLException {
    ContentValues args = new ContentValues();
    args.put(KEY_TITLE, title);
    args.put(KEY_CONTENT, conten);
    return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
  }
}