/* * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package net.micode.notes.gtask.data; import android.content.ContentResolver; import android.content.ContentUris; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.net.Uri; import android.util.Log; import net.micode.notes.data.Notes; import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.DataConstants; import net.micode.notes.data.Notes.NoteColumns; import net.micode.notes.data.NotesDatabaseHelper.TABLE; import net.micode.notes.gtask.exception.ActionFailureException; import org.json.JSONException; import org.json.JSONObject; // SqlData类用于管理数据库中的笔记数据 public class SqlData { // 类的标签,用于日志记录 private static final String TAG = SqlData.class.getSimpleName(); // 无效的ID常量 private static final int INVALID_ID = -99999; // 数据库查询的列 public static final String[] PROJECTION_DATA = new String[] { DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1, DataColumns.DATA3 }; // 数据库列的索引 public static final int DATA_ID_COLUMN = 0; public static final int DATA_MIME_TYPE_COLUMN = 1; public static final int DATA_CONTENT_COLUMN = 2; public static final int DATA_CONTENT_DATA_1_COLUMN = 3; public static final int DATA_CONTENT_DATA_3_COLUMN = 4; // 成员变量 private ContentResolver mContentResolver; // 内容解析器 private boolean mIsCreate; // 是否为创建状态 private long mDataId; // 数据ID private String mDataMimeType; // 数据MIME类型 private String mDataContent; // 数据内容 private long mDataContentData1; // 数据内容DATA1 private String mDataContentData3; // 数据内容DATA3 private ContentValues mDiffDataValues; // 差异数据值 // 构造函数,初始化SqlData对象 public SqlData(Context context) { mContentResolver = context.getContentResolver(); mIsCreate = true; mDataId = INVALID_ID; mDataMimeType = DataConstants.NOTE; mDataContent = ""; mDataContentData1 = 0; mDataContentData3 = ""; mDiffDataValues = new ContentValues(); } // 从Cursor构造SqlData对象 public SqlData(Context context, Cursor c) { mContentResolver = context.getContentResolver(); mIsCreate = false; loadFromCursor(c); mDiffDataValues = new ContentValues(); } // 从Cursor加载数据 private void loadFromCursor(Cursor c) { mDataId = c.getLong(DATA_ID_COLUMN); mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN); mDataContent = c.getString(DATA_CONTENT_COLUMN); mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN); mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN); } // 设置内容 public void setContent(JSONObject js) throws JSONException { // 根据JSON对象设置数据 // ... } // 获取内容 public JSONObject getContent() throws JSONException { // 根据当前数据创建JSON对象 // ... } // 提交数据到数据库 public void commit(long noteId, boolean validateVersion, long version) { // 根据创建状态和差异数据值,将数据插入或更新到数据库 // ... } // 获取数据ID public long getId() { return mDataId; } }