public class DBHelper extends SQLiteOpenHelper {
private final static String DB_PATH = "/data/data/<package name>/databases/";
private final static String DB_NAME = "<>Database name";
private final Context myContext;
private static SQLiteDatabase db;
CommomMethod mCommomMethod;
ContentValues mContentValues;
MyImageLoader myImageLoader;
Bitmap mBitmap;
/**
* Constructor Takes and keeps a reference of the passed context in order to
* access to the application assets and resources.
*
* @param context
*/
public DBHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
mCommomMethod=new CommomMethod(myContext);
myImageLoader=new MyImageLoader(myContext);
}
/**
* Creates a empty database on the system and rewrites it with your own
* database.
* */
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
// do nothing - database already exist
} else {
// By calling this method and empty database will be created into
// the default system path
// of your application so we are gonna be able to overwrite that
// database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each
* time you open the application.
*
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
} catch (SQLiteException e) {
// database does't exist yet.
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created
* empty database in the system folder, from where it can be accessed and
* handled. This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException {
// Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
// Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[2048];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDatabase() throws SQLException {
try {
db.close();
} catch (Exception e) {
}
// Open the database
String myPath = DB_PATH + DB_NAME;
db = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
}
public synchronized void close() {
if (db != null)
db.close();
super.close();
}
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
/**
* Use this function to set the value of a particular column
*
* @param columnName
* The column name whose value is to be changed
* @param newColumnValue
* The value to be replaced in the column
* @param whereColumnName
* The column name to be compared with the where clause
* @param whereColumnValue
* The value to be compared in the where clause
*/
void onUpdateSet(String columnName, String newColumnValue,
String[] whereColumnName, String[] whereColumnValue) {
String expanded_ColumnNames = new String(whereColumnName[0]);
String expanded_ColumnValues = new String(whereColumnValue[0]);
for (int i = 1; i < whereColumnName.length; i++) {
expanded_ColumnNames = expanded_ColumnNames + ","
+ whereColumnName[i];
expanded_ColumnValues = expanded_ColumnValues + ","
+ whereColumnValue[i];
}
try {
openDatabase();
db.execSQL("update recipe set \"" + columnName + "\" = \""
+ newColumnValue + "\" where \"" + expanded_ColumnNames
+ "\" = \"" + expanded_ColumnValues + "\"");
} catch (Exception e) {
}
}
/**
* Query the given table, returning a Cursor over the result set.
*
* @param table
* The table name to compile the query against.
* @param columns
* A list of which columns to return. Passing null will return
* all columns, which is discouraged to prevent reading data from
* storage that isn't going to be used.
* @param selection
* A filter declaring which rows to return, formatted as an SQL
* WHERE clause (excluding the WHERE itself). Passing null will
* return all rows for the given table.
* @param selectionArgs
* You may include ?s in selection, which will be replaced by the
* values from selectionArgs, in order that they appear in the
* selection. The values will be bound as Strings.
* @param groupBy
* A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having
* A filter declare which row groups to include in the cursor, if
* row grouping is being used, formatted as an SQL HAVING clause
* (excluding the HAVING itself). Passing null will cause all row
* groups to be included, and is required when row grouping is
* not being used.
* @param orderBy
* How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @return A Cursor object, which is positioned before the first entry
*/
public Cursor onQueryGetCursor(String table, String[] columns, String selection,
String[] selectionArgs, String groupBy, String having,String orderBy) {
Cursor query = null;
try {
openDatabase();
query = db.query(table, columns, selection, selectionArgs, groupBy,
having, orderBy);
} catch (Exception e) {
}
return query;
}
/**
* Use this method to search a particular String in the provided field.
*
*
* @param columns
* The array of columns to be returned
* @param table
* The table name
* @param whereColumn
* The where clause specifying a particular columns
* @param keyword
* The keyword which is to be searched
*
* @return The cursor containing the result of the query
*/
Cursor onSearchGetCursor(String[] columns, String table,
String[] whereColumn, String keyword) {
String expColumns = new String(columns[0]);
Cursor rawquery = null;
for (int i = 1; i < columns.length; i++)
expColumns = expColumns + "," + columns[i];
try {
openDatabase();
rawquery = db.rawQuery("SELECT " + expColumns + " from " + table
+ " where " + whereColumn[0] + " like \"%" + keyword
+ "%\" or " + whereColumn[1] + " like \"%" + keyword
+ "%\" or " + whereColumn[2] + " like \"%" + keyword
+ "%\"", null);
} catch (Exception e) {
}
return rawquery;
}
public Cursor Query(String sql) {
Cursor c = null;
try {
c = db.rawQuery(sql, null);
} catch (Exception e) {
}
return c;
}
public int getFirstRecordSqlQueryInt(String sql) {
Cursor c = null;
try {
c = db.rawQuery(sql, null);
} catch (Exception e) {
}
c.moveToFirst();
return c.getInt(0);
}
public String getFirstRecordSqlQueryString(String sql) {
Cursor c = null;
try {
c = db.rawQuery(sql, null);
} catch (Exception e) {
}
c.moveToFirst();
return c.getString(0);
}
/**
* update particular record in the database.
* @param table
* @param whereClause
* @param whereArgs
*/
public void onDelete(String table, String whereClause, String[] whereArgs) {
try {
db.delete(table, whereClause, whereArgs);
} catch (Exception e) {
}
}
/**
* update particular record in the database.
* @param tableName
* @param cValue
* @param WhereField
* @param complareValue
*/
public void updateRecord(String tableName,ContentValues cValue, String WhereField, String[] complareValue)
{
openDatabase();
try {
db.update(tableName, cValue, WhereField, complareValue);
} catch (SQLException e) {
}
}
/**
* Insert the record in the database.
* @param tableName
* @param cValue
*/
public void insertRecord(String tableName,ContentValues cValue)
{
openDatabase();
try {
db.insertOrThrow(tableName, null, cValue);
} catch (SQLException e) {
}
}
public void exeQuery(String sql) {
try {
db.execSQL(sql);
} catch (Exception e) {
}
}
public DataHolder read(Cursor mCursor) {
// openDatabase();
DataHolder _holder = null;
if (mCursor != null && mCursor.getCount() > 0) {
mCursor.moveToFirst();
_holder = new DataHolder();
while (!mCursor.isAfterLast()) {
int count = mCursor.getColumnCount();
_holder.CreateRow();
for (int i = 0; i < count; i++) {
_holder.set_Lmap(mCursor.getColumnName(i), mCursor.getString(i));
}
_holder.AddRow();
mCursor.moveToNext();
}
}
return _holder;
}
}
private final static String DB_PATH = "/data/data/<package name>/databases/";
private final static String DB_NAME = "<>Database name";
private final Context myContext;
private static SQLiteDatabase db;
CommomMethod mCommomMethod;
ContentValues mContentValues;
MyImageLoader myImageLoader;
Bitmap mBitmap;
/**
* Constructor Takes and keeps a reference of the passed context in order to
* access to the application assets and resources.
*
* @param context
*/
public DBHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
mCommomMethod=new CommomMethod(myContext);
myImageLoader=new MyImageLoader(myContext);
}
/**
* Creates a empty database on the system and rewrites it with your own
* database.
* */
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
// do nothing - database already exist
} else {
// By calling this method and empty database will be created into
// the default system path
// of your application so we are gonna be able to overwrite that
// database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each
* time you open the application.
*
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
} catch (SQLiteException e) {
// database does't exist yet.
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created
* empty database in the system folder, from where it can be accessed and
* handled. This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException {
// Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
// Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[2048];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDatabase() throws SQLException {
try {
db.close();
} catch (Exception e) {
}
// Open the database
String myPath = DB_PATH + DB_NAME;
db = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
}
public synchronized void close() {
if (db != null)
db.close();
super.close();
}
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
/**
* Use this function to set the value of a particular column
*
* @param columnName
* The column name whose value is to be changed
* @param newColumnValue
* The value to be replaced in the column
* @param whereColumnName
* The column name to be compared with the where clause
* @param whereColumnValue
* The value to be compared in the where clause
*/
void onUpdateSet(String columnName, String newColumnValue,
String[] whereColumnName, String[] whereColumnValue) {
String expanded_ColumnNames = new String(whereColumnName[0]);
String expanded_ColumnValues = new String(whereColumnValue[0]);
for (int i = 1; i < whereColumnName.length; i++) {
expanded_ColumnNames = expanded_ColumnNames + ","
+ whereColumnName[i];
expanded_ColumnValues = expanded_ColumnValues + ","
+ whereColumnValue[i];
}
try {
openDatabase();
db.execSQL("update recipe set \"" + columnName + "\" = \""
+ newColumnValue + "\" where \"" + expanded_ColumnNames
+ "\" = \"" + expanded_ColumnValues + "\"");
} catch (Exception e) {
}
}
/**
* Query the given table, returning a Cursor over the result set.
*
* @param table
* The table name to compile the query against.
* @param columns
* A list of which columns to return. Passing null will return
* all columns, which is discouraged to prevent reading data from
* storage that isn't going to be used.
* @param selection
* A filter declaring which rows to return, formatted as an SQL
* WHERE clause (excluding the WHERE itself). Passing null will
* return all rows for the given table.
* @param selectionArgs
* You may include ?s in selection, which will be replaced by the
* values from selectionArgs, in order that they appear in the
* selection. The values will be bound as Strings.
* @param groupBy
* A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having
* A filter declare which row groups to include in the cursor, if
* row grouping is being used, formatted as an SQL HAVING clause
* (excluding the HAVING itself). Passing null will cause all row
* groups to be included, and is required when row grouping is
* not being used.
* @param orderBy
* How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @return A Cursor object, which is positioned before the first entry
*/
public Cursor onQueryGetCursor(String table, String[] columns, String selection,
String[] selectionArgs, String groupBy, String having,String orderBy) {
Cursor query = null;
try {
openDatabase();
query = db.query(table, columns, selection, selectionArgs, groupBy,
having, orderBy);
} catch (Exception e) {
}
return query;
}
/**
* Use this method to search a particular String in the provided field.
*
*
* @param columns
* The array of columns to be returned
* @param table
* The table name
* @param whereColumn
* The where clause specifying a particular columns
* @param keyword
* The keyword which is to be searched
*
* @return The cursor containing the result of the query
*/
Cursor onSearchGetCursor(String[] columns, String table,
String[] whereColumn, String keyword) {
String expColumns = new String(columns[0]);
Cursor rawquery = null;
for (int i = 1; i < columns.length; i++)
expColumns = expColumns + "," + columns[i];
try {
openDatabase();
rawquery = db.rawQuery("SELECT " + expColumns + " from " + table
+ " where " + whereColumn[0] + " like \"%" + keyword
+ "%\" or " + whereColumn[1] + " like \"%" + keyword
+ "%\" or " + whereColumn[2] + " like \"%" + keyword
+ "%\"", null);
} catch (Exception e) {
}
return rawquery;
}
public Cursor Query(String sql) {
Cursor c = null;
try {
c = db.rawQuery(sql, null);
} catch (Exception e) {
}
return c;
}
public int getFirstRecordSqlQueryInt(String sql) {
Cursor c = null;
try {
c = db.rawQuery(sql, null);
} catch (Exception e) {
}
c.moveToFirst();
return c.getInt(0);
}
public String getFirstRecordSqlQueryString(String sql) {
Cursor c = null;
try {
c = db.rawQuery(sql, null);
} catch (Exception e) {
}
c.moveToFirst();
return c.getString(0);
}
/**
* update particular record in the database.
* @param table
* @param whereClause
* @param whereArgs
*/
public void onDelete(String table, String whereClause, String[] whereArgs) {
try {
db.delete(table, whereClause, whereArgs);
} catch (Exception e) {
}
}
/**
* update particular record in the database.
* @param tableName
* @param cValue
* @param WhereField
* @param complareValue
*/
public void updateRecord(String tableName,ContentValues cValue, String WhereField, String[] complareValue)
{
openDatabase();
try {
db.update(tableName, cValue, WhereField, complareValue);
} catch (SQLException e) {
}
}
/**
* Insert the record in the database.
* @param tableName
* @param cValue
*/
public void insertRecord(String tableName,ContentValues cValue)
{
openDatabase();
try {
db.insertOrThrow(tableName, null, cValue);
} catch (SQLException e) {
}
}
public void exeQuery(String sql) {
try {
db.execSQL(sql);
} catch (Exception e) {
}
}
public DataHolder read(Cursor mCursor) {
// openDatabase();
DataHolder _holder = null;
if (mCursor != null && mCursor.getCount() > 0) {
mCursor.moveToFirst();
_holder = new DataHolder();
while (!mCursor.isAfterLast()) {
int count = mCursor.getColumnCount();
_holder.CreateRow();
for (int i = 0; i < count; i++) {
_holder.set_Lmap(mCursor.getColumnName(i), mCursor.getString(i));
}
_holder.AddRow();
mCursor.moveToNext();
}
}
return _holder;
}
}
No comments:
Post a Comment