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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// 该类定义了访问本地 SQLite 数据库中笔记数据表的方法
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package net.micode.notes.gtask.data;
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import android.content.ContentResolver;
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import android.content.ContentUris;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.Cursor;
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import android.net.Uri;
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import android.util.Log;
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import net.micode.notes.data.Notes;
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import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.DataConstants;
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import net.micode.notes.data.Notes.NoteColumns;
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import net.micode.notes.data.NotesDatabaseHelper.TABLE;
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import net.micode.notes.gtask.exception.ActionFailureException;
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import org.json.JSONException;
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import org.json.JSONObject;
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public class SqlData {
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private static final String TAG = SqlData.class.getSimpleName();// 日志 TAG
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private static final int INVALID_ID = -99999;// 无效的数据 ID
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public static final String[] PROJECTION_DATA = new String[] {// 数据表中常用的列
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DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
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DataColumns.DATA3
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};
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public static final int DATA_ID_COLUMN = 0;
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public static final int DATA_MIME_TYPE_COLUMN = 1;
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public static final int DATA_CONTENT_COLUMN = 2;
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public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
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public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
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private ContentResolver mContentResolver;// ContentResolver 用于访问本地数据库
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private boolean mIsCreate;// 是否为新建的数据
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private long mDataId; // 数据的各个列的值
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private String mDataMimeType;
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private String mDataContent;
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private long mDataContentData1;
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private String mDataContentData3;
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private ContentValues mDiffDataValues; // 修改时的差异数据
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public SqlData(Context context) {// 构造方法1：用于新建数据
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mContentResolver = context.getContentResolver();
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mIsCreate = true;
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mDataId = INVALID_ID;
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mDataMimeType = DataConstants.NOTE;
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mDataContent = "";
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mDataContentData1 = 0;
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mDataContentData3 = "";
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mDiffDataValues = new ContentValues();
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}
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public SqlData(Context context, Cursor c) {// 构造方法2：用于从数据库中读取数据
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mContentResolver = context.getContentResolver();
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mIsCreate = false;
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loadFromCursor(c);
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mDiffDataValues = new ContentValues();
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}
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private void loadFromCursor(Cursor c) {// 从 Cursor 中读取数据
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mDataId = c.getLong(DATA_ID_COLUMN);
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mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN);
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mDataContent = c.getString(DATA_CONTENT_COLUMN);
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mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN);
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mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN);
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}
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<<<<<<< HEAD
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public void setContent(JSONObject js) throws JSONException {
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=======
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public void setContent(JSONObject js) throws JSONException {//建立连接
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mDiffDataValues.put(DataColumns.ID, dataId);
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mDataId = dataId;
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String dataMimeType = js.has(DataColumns.MIME_TYPE) ? js.getString(DataColumns.MIME_TYPE)
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: DataConstants.NOTE;
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if (mIsCreate || !mDataMimeType.equals(dataMimeType)) {
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mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType);
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}
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mDataMimeType = dataMimeType;
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String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : "";
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if (mIsCreate || !mDataContent.equals(dataContent)) {
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mDiffDataValues.put(DataColumns.CONTENT, dataContent);
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}
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mDataContent = dataContent;
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long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0;
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if (mIsCreate || mDataContentData1 != dataContentData1) {
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mDiffDataValues.put(DataColumns.DATA1, dataContentData1);
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}
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mDataContentData1 = dataContentData1;
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String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : "";
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if (mIsCreate || !mDataContentData3.equals(dataContentData3)) {
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mDiffDataValues.put(DataColumns.DATA3, dataContentData3);
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}
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mDataContentData3 = dataContentData3;
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}
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public JSONObject getContent() throws JSONException {
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if (mIsCreate) {
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Log.e(TAG, "it seems that we haven't created this in database yet");
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return null;
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}
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JSONObject js = new JSONObject();
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js.put(DataColumns.ID, mDataId);
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js.put(DataColumns.MIME_TYPE, mDataMimeType);
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js.put(DataColumns.CONTENT, mDataContent);
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js.put(DataColumns.DATA1, mDataContentData1);
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js.put(DataColumns.DATA3, mDataContentData3);
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return js;
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}
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<<<<<<< HEAD
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public void commit(long noteId, boolean validateVersion, long version) {
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=======
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public void commit(long noteId, boolean validateVersion, long version) {//提交数据更改
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/* 如果 mIsCreate 为 true，表示正在创建新的笔记。
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在这种情况下，首先会检查 mDataId 是否为无效值，
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如果是，并且 mDiffDataValues 中包含了 DataColumns.ID，
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则会将其移除。然后将 noteId 放入 mDiffDataValues 中，
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并通过 mContentResolver 根据 mDiffDataValues 插入数据到 Notes.CONTENT_DATA_URI 中，
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并获取插入数据的路径信息。最后将路径中的第二个片段转换为 Long 值存储到 mDataId */
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>>>>>>> develop
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if (mIsCreate) {
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if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
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mDiffDataValues.remove(DataColumns.ID);
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}
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mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
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Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
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try {
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mDataId = Long.valueOf(uri.getPathSegments().get(1));
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} catch (NumberFormatException e) {
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Log.e(TAG, "Get note id error :" + e.toString());
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throw new ActionFailureException("create note failed");
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}
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<<<<<<< HEAD
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} else {
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=======
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}
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/*如果 mIsCreate 不为 true，表示正在更新现有笔记。
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首先判断 mDiffDataValues 的大小是否大于 0，如果是，
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根据是否需要验证版本号通过 mContentResolver 更新数据。如果不需要验证版本号，
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则直接根据 mDataId 更新数据；如果需要验证版本号，
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则使用 NoteColumns.ID 和 NoteColumns.VERSION 字段进行联合查询，
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并以 noteId 和 version 的值作为参数，通过 mContentResolver 更新数据。
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更新完成后，如果结果为 0，表示没有更新成功 */
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else {
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>>>>>>> develop
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if (mDiffDataValues.size() > 0) {
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int result = 0;
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if (!validateVersion) {
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result = mContentResolver.update(ContentUris.withAppendedId(
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Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
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} else {
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result = mContentResolver.update(ContentUris.withAppendedId(
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Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
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" ? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE
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+ " WHERE " + NoteColumns.VERSION + "=?)", new String[] {
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String.valueOf(noteId), String.valueOf(version)
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});
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}
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if (result == 0) {
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Log.w(TAG, "there is no update. maybe user updates note when syncing");
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}
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}
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}
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mDiffDataValues.clear();
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mIsCreate = false;
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}
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<<<<<<< HEAD
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public long getId() {
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=======
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public long getId() {//获取ID
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>>>>>>> develop
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return mDataId;
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}
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}
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