From 42f202210726c451223116737234d3b16efc3cc6 Mon Sep 17 00:00:00 2001 From: p3o5nagmu <1329414441@qq.com> Date: Tue, 31 Dec 2024 03:26:40 +0800 Subject: [PATCH] ADD file via upload --- SqlData.java | 199 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 199 insertions(+) create mode 100644 SqlData.java diff --git a/SqlData.java b/SqlData.java new file mode 100644 index 0000000..3795bf0 --- /dev/null +++ b/SqlData.java @@ -0,0 +1,199 @@ +/* + * 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，可能用于处理与数据库相关的数据操作，比如从数据库读取数据、将数据更新到数据库以及和JSON数据的相互转换等 +public class SqlData { + // 用于日志记录的标签，使用类的简单名称，方便在日志中识别该类相关的输出信息 + private static final String TAG = SqlData.class.getSimpleName(); + // 定义一个表示无效ID的值，可能用于初始化或者标记不符合要求的ID情况 + private static final int INVALID_ID = -99999; + + // 定义查询数据时要获取的列名数组，用于指定从数据库获取哪些字段的数据 + public static final String[] PROJECTION_DATA = new String[] { + DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1, + DataColumns.DATA3 + }; + // 表示在查询结果游标中数据ID列的索引位置，方便从游标中获取对应的数据 + public static final int DATA_ID_COLUMN = 0; + // 表示在查询结果游标中数据MIME类型列的索引位置 + public static final int DATA_MIME_TYPE_COLUMN = 1; + // 表示在查询结果游标中数据内容列的索引位置 + public static final int DATA_CONTENT_COLUMN = 2; + // 表示在查询结果游标中数据特定内容字段DATA1列的索引位置 + public static final int DATA_CONTENT_DATA_1_COLUMN = 3; + // 表示在查询结果游标中数据特定内容字段DATA3列的索引位置 + public static final int DATA_CONTENT_DATA_3_COLUMN = 4; + + // 用于操作内容提供器，实现和数据库的数据交互，比如查询、插入、更新等操作 + private ContentResolver mContentResolver; + // 标记是否是创建操作的标志位，true表示正在创建新数据，初始化为true + private boolean mIsCreate; + // 存储数据的ID，初始化为无效ID值 + private long mDataId; + // 存储数据的MIME类型，初始化为默认的笔记类型（从DataConstants.NOTE获取） + private String mDataMimeType; + // 存储数据的内容，初始化为空字符串 + private String mDataContent; + // 存储数据内容中特定的长整型数据（对应DATA1字段），初始化为0 + private long mDataContentData1; + // 存储数据内容中特定的字符串数据（对应DATA3字段），初始化为空字符串 + private String mDataContentData3; + // 用于存放要更新到数据库的数据值，类似一个键值对集合，方便批量更新操作 + private ContentValues mDiffDataValues; + + // 构造函数，传入上下文用于获取内容提供器，初始化相关成员变量，通常用于创建新数据的情况 + public SqlData(Context context) { + mContentResolver = context.getContentResolver(); + mIsCreate = true; + mDataId = INVALID_ID; + mDataMimeType = DataConstants.NOTE; + mDataContent = ""; + mDataContentData1 = 0; + mDataContentData3 = ""; + mDiffDataValues = new ContentValues(); + } + + // 另一个构造函数，传入上下文和游标，用于从已有的游标数据中加载信息初始化成员变量，通常用于读取现有数据的情况 + public SqlData(Context context, Cursor c) { + mContentResolver = context.getContentResolver(); + mIsCreate = false; + loadFromCursor(c); + mDiffDataValues = new ContentValues(); + } + + // 从游标中加载数据到成员变量的私有方法，按照定义好的列索引位置获取对应的数据赋值给成员变量 + 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); + } + + // 根据传入的JSON对象设置相关数据成员变量，并将有变化的数据放入mDiffDataValues中，用于后续更新数据库操作 + public void setContent(JSONObject js) throws JSONException { + long dataId = js.has(DataColumns.ID)? js.getLong(DataColumns.ID) : INVALID_ID; + if (mIsCreate || mDataId!= dataId) { + mDiffDataValues.put(DataColumns.ID, dataId); + } + mDataId = dataId; + + String dataMimeType = js.has(DataColumns.MIME_TYPE)? js.getString(DataColumns.MIME_TYPE) + : DataConstants.NOTE; + if (mIsCreate ||!mDataMimeType.equals(dataMimeType)) { + mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType); + } + mDataMimeType = dataMimeType; + + String dataContent = js.has(DataColumns.CONTENT)? js.getString(DataColumns.CONTENT) : ""; + if (mIsCreate ||!mDataContent.equals(dataContent)) { + mDiffDataValues.put(DataColumns.CONTENT, dataContent); + } + mDataContent = dataContent; + + long dataContentData1 = js.has(DataColumns.DATA1)? js.getLong(DataColumns.DATA1) : 0; + if (mIsCreate || mDataContentData1!= dataContentData1) { + mDiffDataValues.put(DataColumns.DATA1, dataContentData1); + } + mDataContentData1 = dataContentData1; + + String dataContentData3 = js.has(DataColumns.DATA3)? js.getString(DataColumns.DATA3) : ""; + if (mIsCreate ||!mDataContentData3.equals(dataContentData3)) { + mDiffDataValues.put(DataColumns.DATA3, dataContentData3); + } + mDataContentData3 = dataContentData3; + } + + // 根据当前成员变量的数据生成对应的JSON对象，若处于创建状态则记录错误日志并返回null + public JSONObject getContent() throws JSONException { + if (mIsCreate) { + Log.e(TAG, "it seems that we haven't created this in database yet"); + return null; + } + JSONObject js = new JSONObject(); + js.put(DataColumns.ID, mDataId); + js.put(DataColumns.MIME_TYPE, mDataMimeType); + js.put(DataColumns.CONTENT, mDataContent); + js.put(DataColumns.DATA1, mDataContentData1); + js.put(DataColumns.DATA3, mDataContentData3); + return js; + } + + // 将数据提交到数据库的方法，根据是否是创建操作执行不同的逻辑，创建则插入数据，否则根据条件更新数据 + public void commit(long noteId, boolean validateVersion, long version) { + + if (mIsCreate) { + if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) { + mDiffDataValues.remove(DataColumns.ID); + } + + mDiffDataValues.put(DataColumns.NOTE_ID, noteId); + Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues); + try { + mDataId = Long.valueOf(uri.getPathSegments().get(1)); + } catch (NumberFormatException e) { + Log.e(TAG, "Get note id error :" + e.toString()); + throw new ActionFailureException("create note failed"); + } + } else { + if (mDiffDataValues.size() > 0) { + int result = 0; + if (!validateVersion) { + result = mContentResolver.update(ContentUris.withAppendedId( + Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null); + } else { + result = mContentResolver.update(ContentUris.withAppendedId( + Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, + "? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE + + " WHERE " + NoteColumns.VERSION + "=?)", new String[] { + String.valueOf(noteId), String.valueOf(version) + }); + } + if (result == 0) { + Log.w(TAG, "there is no update. maybe user updates note when syncing"); + } + } + } + + mDiffDataValues.clear(); + mIsCreate = false; + } + + // 获取数据ID的方法，外部可调用此方法获取当前对象关联的数据ID + public long getId() { + return mDataId; + } +} \ No newline at end of file