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301 lines
8.5 KiB
Java
301 lines
8.5 KiB
Java
/*
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* Copyright (c) 2009, Todoroo Inc
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* All Rights Reserved
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* http://www.todoroo.com
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*/
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package com.todoroo.andlib.data;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.util.ArrayList;
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import android.content.ContentValues;
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import android.database.Cursor;
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import android.util.Log;
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import com.todoroo.andlib.service.Autowired;
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import com.todoroo.andlib.service.DependencyInjectionService;
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import com.todoroo.andlib.sql.Criterion;
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import com.todoroo.andlib.sql.Query;
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/**
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* DAO for reading data from an instance of {@link AbstractDatabase}. If you
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* are writing an add-on for Astrid, you probably want to be using a subclass
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* of {@link ContentResolverDao} instead.
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*
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* @author Tim Su <tim@todoroo.com>
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*
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*/
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public class DatabaseDao<TYPE extends AbstractModel> {
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private final Class<TYPE> modelClass;
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private Table table;
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private AbstractDatabase database;
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@Autowired
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protected Boolean debug;
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public DatabaseDao(Class<TYPE> modelClass) {
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DependencyInjectionService.getInstance().inject(this);
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this.modelClass = modelClass;
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if(debug == null)
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debug = false;
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}
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public DatabaseDao(Class<TYPE> modelClass, AbstractDatabase database) {
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this(modelClass);
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setDatabase(database);
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}
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/** Gets table associated with this DAO */
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public Table getTable() {
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return table;
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}
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/**
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* Sets database accessed by this DAO. Used for dependency-injected
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* initialization by child classes and unit tests
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*
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* @param database
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*/
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public void setDatabase(AbstractDatabase database) {
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if(database == this.database)
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return;
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this.database = database;
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table = database.getTable(modelClass);
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}
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// --- listeners
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public interface ModelUpdateListener<MTYPE> {
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public void onModelUpdated(MTYPE model);
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}
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private final ArrayList<ModelUpdateListener<TYPE>> listeners =
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new ArrayList<ModelUpdateListener<TYPE>>();
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public void addListener(ModelUpdateListener<TYPE> listener) {
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listeners.add(listener);
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}
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protected void onModelUpdated(TYPE model) {
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for(ModelUpdateListener<TYPE> listener : listeners) {
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listener.onModelUpdated(model);
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}
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}
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// --- dao methods
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/**
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* Construct a query with SQL DSL objects
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*
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* @param query
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* @return
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*/
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public TodorooCursor<TYPE> query(Query query) {
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query.from(table);
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if(debug)
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Log.i("SQL-" + modelClass.getSimpleName(), query.toString()); //$NON-NLS-1$
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Cursor cursor = database.rawQuery(query.toString(), null);
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return new TodorooCursor<TYPE>(cursor, query.getFields());
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}
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/**
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* Construct a query with raw SQL
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*
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* @param properties
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* @param selection
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* @param selectionArgs
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* @return
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*/
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public TodorooCursor<TYPE> rawQuery(String selection, String[] selectionArgs, Property<?>... properties) {
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String[] fields = new String[properties.length];
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for(int i = 0; i < properties.length; i++)
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fields[i] = properties[i].name;
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return new TodorooCursor<TYPE>(database.getDatabase().query(table.name,
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fields, selection, selectionArgs, null, null, null),
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properties);
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}
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/**
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* Returns object corresponding to the given identifier
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*
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* @param database
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* @param table
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* name of table
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* @param properties
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* properties to read
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* @param id
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* id of item
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* @return null if no item found
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*/
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public TYPE fetch(long id, Property<?>... properties) {
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TodorooCursor<TYPE> cursor = fetchItem(id, properties);
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try {
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if (cursor.getCount() == 0)
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return null;
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Constructor<TYPE> constructor = modelClass.getConstructor(TodorooCursor.class);
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return constructor.newInstance(cursor);
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} catch (SecurityException e) {
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throw new RuntimeException(e);
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} catch (NoSuchMethodException e) {
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throw new RuntimeException(e);
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} catch (IllegalArgumentException e) {
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throw new RuntimeException(e);
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} catch (InstantiationException e) {
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throw new RuntimeException(e);
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} catch (IllegalAccessException e) {
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throw new RuntimeException(e);
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} catch (InvocationTargetException e) {
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throw new RuntimeException(e);
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} finally {
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cursor.close();
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}
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}
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/**
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* Delete the given id
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*
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* @param database
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* @param id
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* @return true if delete was successful
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*/
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public boolean delete(long id) {
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return database.delete(table.name,
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AbstractModel.ID_PROPERTY.eq(id).toString(), null) > 0;
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}
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/**
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* Delete all matching a clause
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* @param where predicate for deletion
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* @return # of deleted items
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*/
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public int deleteWhere(Criterion where) {
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return database.delete(table.name,
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where.toString(), null);
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}
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/**
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* Update all matching a clause to have the values set on template object.
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* <p>
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* Example (updates "joe" => "bob" in metadata value1):
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* {code}
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* Metadata item = new Metadata();
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* item.setValue(Metadata.VALUE1, "bob");
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* update(item, Metadata.VALUE1.eq("joe"));
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* {code}
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* @param where sql criteria
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* @param template set fields on this object in order to set them in the db.
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* @return # of updated items
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*/
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public int update(Criterion where, TYPE template) {
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return database.update(table.name, template.getSetValues(),
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where.toString(), null);
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}
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/**
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* Save the given object to the database. Creates a new object if
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* model id property has not been set
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*
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* @return true on success.
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*/
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public boolean persist(TYPE item) {
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if (item.getId() == AbstractModel.NO_ID) {
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return createNew(item);
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} else {
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ContentValues values = item.getSetValues();
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if (values.size() == 0) // nothing changed
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return true;
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return saveExisting(item);
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}
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}
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/**
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* Creates the given item.
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*
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* @param database
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* @param table
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* table name
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* @param item
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* item model
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* @return returns true on success.
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*/
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public boolean createNew(TYPE item) {
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item.clearValue(AbstractModel.ID_PROPERTY);
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long newRow = database.insert(table.name,
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AbstractModel.ID_PROPERTY.name, item.getMergedValues());
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boolean result = newRow >= 0;
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if(result) {
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item.setId(newRow);
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onModelUpdated(item);
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item.markSaved();
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}
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return result;
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}
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/**
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* Saves the given item. Will not create a new item!
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*
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* @param database
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* @param table
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* table name
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* @param item
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* item model
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* @return returns true on success.
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*/
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public boolean saveExisting(TYPE item) {
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ContentValues values = item.getSetValues();
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if(values == null || values.size() == 0) // nothing changed
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return true;
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boolean result = database.update(table.name, values,
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AbstractModel.ID_PROPERTY.eq(item.getId()).toString(), null) > 0;
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if(result) {
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onModelUpdated(item);
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item.markSaved();
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}
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return result;
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}
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/**
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* Updates multiple rows of the database based on model set values
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*
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* @param item
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* item model
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* @param criterion
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* @return returns true on success.
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*/
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public int updateMultiple(ContentValues values, Criterion criterion) {
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if(values.size() == 0) // nothing changed
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return 0;
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return database.update(table.name, values, criterion.toString(), null);
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}
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// --- helper methods
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/**
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* Returns cursor to object corresponding to the given identifier
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*
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* @param database
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* @param table
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* name of table
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* @param properties
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* properties to read
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* @param id
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* id of item
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* @return
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*/
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protected TodorooCursor<TYPE> fetchItem(long id, Property<?>... properties) {
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TodorooCursor<TYPE> cursor = query(
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Query.select(properties).where(AbstractModel.ID_PROPERTY.eq(id)));
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cursor.moveToFirst();
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return new TodorooCursor<TYPE>(cursor, properties);
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}
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}
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