From a90fe8e947d1cf7cd0349906ef17e4eb982f6d56 Mon Sep 17 00:00:00 2001 From: weichunyi <2948523237@qq.com> Date: Thu, 12 Jun 2025 14:30:21 +0800 Subject: [PATCH] =?UTF-8?q?=E8=A7=A3=E5=86=B3=E5=86=B2=E7=AA=81?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...源软件维护方案及成果模板.docx | Bin 16779 -> 18307 bytes .../notes/data/NotesDatabaseHelper.java | 365 +++++++++++------- .../net/micode/notes/data/NotesProvider.java | 236 ++++++----- 3 files changed, 363 insertions(+), 238 deletions(-) diff --git a/doc/开源软件维护方案及成果模板.docx b/doc/开源软件维护方案及成果模板.docx index ef65cfccd1b362848a4416269a65163909afc486..d9db027e50b7bbc411e96e39b7b1f6381d9a33ad 100644 GIT binary patch delta 12425 zcmbVyWl&w+vhBv*B?NbO5AF`Z-5r9vZ(KsqjRkjicY?dSySqEweCNEn=iU3~RlW6N zRn6I5qerh^R^1~q2rMWDES3YR&_ko%B8~?is4T3|%Z%Dib{$6j*r$*h9N1VX15X8+ zh_)vz~-l#cs3OdVLp75EO8M@vzA}=noG1<-u_qN zJpN0(Z^U#x*9MR}-QMM*=8cCPqQqT&K+DgAO!>UUT?D_ou08S%g%`UY&9D)r#sWw@ 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z(?TN&>y@EZfR@L6L&ga)PY#4X3*Fbs&!bkS6R0O5%YlIESDUm_M(CRhk;UTav z*zI`HgG31Nxvd+KJP)8SA<6$3#FJ;ej;InmiT==1TftdAuokbq0SAJSNQp*+<&gW< zY#J0Uke_voShg-mCVj2R zxQqc}WV(18Ea$J*52T*UGYIv_KYu-0%$-uj7`izUBTjCW1U-Kij8x@U9QOYG{Vx$r zgNAV92Z@S{KqPU4g2dS&+PFc@;ye&CY@jP~ZipQo5VeFL1QIWZRG1XhB83J@lE8;> zVguDlh(IW_gKi~E{>z>T(vsvO_%EB_Uzgxt+uA=N;okxWBmH~s1yxE?68@*H?SJx0 zkRTxBmqaOgh*BsJqZAti6d%Y)iU)#;48|#q7wKaFDlO8yII0t&PzEdVi#2O^T; Sfq2FPY0A*R5DNY)_0" + ";" + - " END"; + "CREATE TRIGGER decrease_folder_count_on_update " + + " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + + " BEGIN " + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + + " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + + " AND " + NoteColumns.NOTES_COUNT + ">0" + ";" + + " END"; /** - * Increase folder's note count when insert new note to the folder + * 触发器：当插入新便签时，增加父文件夹的便签计数 */ private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER = - "CREATE TRIGGER increase_folder_count_on_insert " + - " AFTER INSERT ON " + TABLE.NOTE + - " BEGIN " + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + - " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + - " END"; + "CREATE TRIGGER increase_folder_count_on_insert " + + " AFTER INSERT ON " + TABLE.NOTE + + " BEGIN " + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + + " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + + " END"; /** - * Decrease folder's note count when delete note from the folder + * 触发器：当删除便签时，减少父文件夹的便签计数 */ private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER = - "CREATE TRIGGER decrease_folder_count_on_delete " + - " AFTER DELETE ON " + TABLE.NOTE + - " BEGIN " + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + - " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + - " AND " + NoteColumns.NOTES_COUNT + ">0;" + - " END"; + "CREATE TRIGGER decrease_folder_count_on_delete " + + " AFTER DELETE ON " + TABLE.NOTE + + " BEGIN " + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + + " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + + " AND " + NoteColumns.NOTES_COUNT + ">0;" + + " END"; /** - * Update note's content when insert data with type {@link DataConstants#NOTE} + * 触发器：当插入类型为NOTE的数据时，更新便签的内容摘要 */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER = - "CREATE TRIGGER update_note_content_on_insert " + - " AFTER INSERT ON " + TABLE.DATA + - " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + - " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + - " END"; + "CREATE TRIGGER update_note_content_on_insert " + + " AFTER INSERT ON " + TABLE.DATA + + " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + + " BEGIN" + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + + " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + + " END"; /** - * Update note's content when data with {@link DataConstants#NOTE} type has changed + * 触发器：当更新类型为NOTE的数据时，更新便签的内容摘要 */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER = - "CREATE TRIGGER update_note_content_on_update " + - " AFTER UPDATE ON " + TABLE.DATA + - " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + - " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + - " END"; + "CREATE TRIGGER update_note_content_on_update " + + " AFTER UPDATE ON " + TABLE.DATA + + " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + + " BEGIN" + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + + " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + + " END"; /** - * Update note's content when data with {@link DataConstants#NOTE} type has deleted + * 触发器：当删除类型为NOTE的数据时，清空便签的内容摘要 */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER = - "CREATE TRIGGER update_note_content_on_delete " + - " AFTER delete ON " + TABLE.DATA + - " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.SNIPPET + "=''" + - " WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + - " END"; + "CREATE TRIGGER update_note_content_on_delete " + + " AFTER delete ON " + TABLE.DATA + + " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + + " BEGIN" + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.SNIPPET + "=''" + + " WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + + " END"; /** - * Delete datas belong to note which has been deleted + * 触发器：当删除便签时，自动删除关联的数据 */ private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER = - "CREATE TRIGGER delete_data_on_delete " + - " AFTER DELETE ON " + TABLE.NOTE + - " BEGIN" + - " DELETE FROM " + TABLE.DATA + - " WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + - " END"; + "CREATE TRIGGER delete_data_on_delete " + + " AFTER DELETE ON " + TABLE.NOTE + + " BEGIN" + + " DELETE FROM " + TABLE.DATA + + " WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + + " END"; /** - * Delete notes belong to folder which has been deleted + * 触发器：当删除文件夹时，自动删除该文件夹下的所有便签 */ private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER = - "CREATE TRIGGER folder_delete_notes_on_delete " + - " AFTER DELETE ON " + TABLE.NOTE + - " BEGIN" + - " DELETE FROM " + TABLE.NOTE + - " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + - " END"; + "CREATE TRIGGER folder_delete_notes_on_delete " + + " AFTER DELETE ON " + TABLE.NOTE + + " BEGIN" + + " DELETE FROM " + TABLE.NOTE + + " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + + " END"; /** - * Move notes belong to folder which has been moved to trash folder + * 触发器：当文件夹被移动到回收站时，将其下的便签也移动到回收站 */ private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER = - "CREATE TRIGGER folder_move_notes_on_trash " + - " AFTER UPDATE ON " + TABLE.NOTE + - " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + - " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + - " END"; - + "CREATE TRIGGER folder_move_notes_on_trash " + + " AFTER UPDATE ON " + TABLE.NOTE + + " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + + " BEGIN" + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + + " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + + " END"; + + // 构造函数 public NotesDatabaseHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); } + /** + * 创建便签表 + * @param db SQLiteDatabase对象 + */ public void createNoteTable(SQLiteDatabase db) { - db.execSQL(CREATE_NOTE_TABLE_SQL); - reCreateNoteTableTriggers(db); - createSystemFolder(db); + db.execSQL(CREATE_NOTE_TABLE_SQL); // 执行创建表SQL + reCreateNoteTableTriggers(db); // 重建触发器 + createSystemFolder(db); // 创建系统文件夹 Log.d(TAG, "note table has been created"); } + /** + * 重建便签表相关的触发器 + * @param db SQLiteDatabase对象 + */ private void reCreateNoteTableTriggers(SQLiteDatabase db) { + // 删除所有现有的触发器 db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update"); db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update"); db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete"); @@ -226,6 +246,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete"); db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash"); + // 重新创建所有触发器 db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER); db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER); db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER); @@ -235,18 +256,22 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER); } + /** + * 创建系统文件夹 + * @param db SQLiteDatabase对象 + */ private void createSystemFolder(SQLiteDatabase db) { ContentValues values = new ContentValues(); /** - * call record foler for call notes + * 创建通话记录文件夹 */ values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); /** - * root folder which is default folder + * 创建根文件夹 */ values.clear(); values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER); @@ -254,7 +279,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.insert(TABLE.NOTE, null, values); /** - * temporary folder which is used for moving note + * 创建临时文件夹（用于移动便签时临时存放） */ values.clear(); values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER); @@ -262,7 +287,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.insert(TABLE.NOTE, null, values); /** - * create trash folder + * 创建回收站文件夹 */ values.clear(); values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); @@ -270,23 +295,38 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.insert(TABLE.NOTE, null, values); } + /** + * 创建数据表 + * @param db SQLiteDatabase对象 + */ public void createDataTable(SQLiteDatabase db) { - db.execSQL(CREATE_DATA_TABLE_SQL); - reCreateDataTableTriggers(db); - db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); + db.execSQL(CREATE_DATA_TABLE_SQL); // 执行创建表SQL + reCreateDataTableTriggers(db); // 重建触发器 + db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建索引 Log.d(TAG, "data table has been created"); } + /** + * 重建数据表相关的触发器 + * @param db SQLiteDatabase对象 + */ private void reCreateDataTableTriggers(SQLiteDatabase db) { + // 删除所有现有的触发器 db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert"); db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update"); db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete"); + // 重新创建所有触发器 db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER); db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER); db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER); } + /** + * 获取单例实例 + * @param context 上下文对象 + * @return NotesDatabaseHelper实例 + */ static synchronized NotesDatabaseHelper getInstance(Context context) { if (mInstance == null) { mInstance = new NotesDatabaseHelper(context); @@ -294,69 +334,98 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { return mInstance; } + /** + * 创建数据库时调用 + * @param db SQLiteDatabase对象 + */ @Override public void onCreate(SQLiteDatabase db) { - createNoteTable(db); - createDataTable(db); + createNoteTable(db); // 创建便签表 + createDataTable(db); // 创建数据表 } + /** + * 升级数据库时调用 + * @param db SQLiteDatabase对象 + * @param oldVersion 旧版本号 + * @param newVersion 新版本号 + */ @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { - boolean reCreateTriggers = false; - boolean skipV2 = false; + boolean reCreateTriggers = false; // 是否需要重建触发器 + boolean skipV2 = false; // 是否跳过V2升级 + // 从V1升级到V2 if (oldVersion == 1) { upgradeToV2(db); - skipV2 = true; // this upgrade including the upgrade from v2 to v3 + skipV2 = true; // 这个升级包含从V2到V3的升级 oldVersion++; } + // 从V2升级到V3 if (oldVersion == 2 && !skipV2) { upgradeToV3(db); reCreateTriggers = true; oldVersion++; } + // 从V3升级到V4 if (oldVersion == 3) { upgradeToV4(db); oldVersion++; } + // 如果需要，重建触发器 if (reCreateTriggers) { reCreateNoteTableTriggers(db); reCreateDataTableTriggers(db); } + // 检查版本号是否匹配 if (oldVersion != newVersion) { throw new IllegalStateException("Upgrade notes database to version " + newVersion + "fails"); } } + /** + * 升级到V2版本：重建所有表 + * @param db SQLiteDatabase对象 + */ private void upgradeToV2(SQLiteDatabase db) { - db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); - db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); - createNoteTable(db); - createDataTable(db); + db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); // 删除便签表 + db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); // 删除数据表 + createNoteTable(db); // 重新创建便签表 + createDataTable(db); // 重新创建数据表 } + /** + * 升级到V3版本：添加GTASK_ID列和回收站文件夹 + * @param db SQLiteDatabase对象 + */ private void upgradeToV3(SQLiteDatabase db) { - // drop unused triggers + // 删除不再使用的触发器 db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert"); db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete"); db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update"); - // add a column for gtask id + + // 添加GTASK_ID列 db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''"); - // add a trash system folder + + // 添加回收站系统文件夹 ContentValues values = new ContentValues(); values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); } + /** + * 升级到V4版本：添加VERSION列 + * @param db SQLiteDatabase对象 + */ private void upgradeToV4(SQLiteDatabase db) { db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0"); } -} +} \ No newline at end of file diff --git a/src/Notes-master/src/net/micode/notes/data/NotesProvider.java b/src/Notes-master/src/net/micode/notes/data/NotesProvider.java index edb0a60..f68161d 100644 --- a/src/Notes-master/src/net/micode/notes/data/NotesProvider.java +++ b/src/Notes-master/src/net/micode/notes/data/NotesProvider.java @@ -14,9 +14,10 @@ * limitations under the License. */ +// 便签内容提供者，负责处理便签数据的CRUD操作 package net.micode.notes.data; - +// 导入所需的Android类 import android.app.SearchManager; import android.content.ContentProvider; import android.content.ContentUris; @@ -29,174 +30,206 @@ import android.net.Uri; import android.text.TextUtils; import android.util.Log; +// 导入应用资源和数据定义 import net.micode.notes.R; import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.NoteColumns; import net.micode.notes.data.NotesDatabaseHelper.TABLE; - +// 便签内容提供者类，继承自ContentProvider public class NotesProvider extends ContentProvider { + // URI匹配器，用于匹配不同的URI请求 private static final UriMatcher mMatcher; + // 数据库帮助类实例 private NotesDatabaseHelper mHelper; + // 日志标签 private static final String TAG = "NotesProvider"; - private static final int URI_NOTE = 1; - private static final int URI_NOTE_ITEM = 2; - private static final int URI_DATA = 3; - private static final int URI_DATA_ITEM = 4; - - private static final int URI_SEARCH = 5; - private static final int URI_SEARCH_SUGGEST = 6; + // URI匹配常量定义 + private static final int URI_NOTE = 1; // 便签表URI + private static final int URI_NOTE_ITEM = 2; // 单个便签URI + private static final int URI_DATA = 3; // 数据表URI + private static final int URI_DATA_ITEM = 4; // 单个数据项URI + private static final int URI_SEARCH = 5; // 搜索URI + private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议URI + // 静态初始化块，配置URI匹配器 static { mMatcher = new UriMatcher(UriMatcher.NO_MATCH); - mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); - mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); - mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); - mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); - mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); - mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); - mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); + mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // 匹配便签表 + mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 匹配单个便签 + mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 匹配数据表 + mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 匹配单个数据项 + mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 匹配搜索 + mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 匹配搜索建议 + mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); // 带参数的搜索建议 } /** - * x'0A' represents the '\n' character in sqlite. For title and content in the search result, - * we will trim '\n' and white space in order to show more information. + * 搜索投影字段定义： + * x'0A'在SQLite中代表换行符'\n'。对于搜索结果中的标题和内容， + * 我们将去除'\n'和空格以显示更多信息。 */ - private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," - + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," - + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + "," - + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," - + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," - + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," - + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; + private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," // 便签ID + + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," // 建议项额外数据 + + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + "," // 建议文本1 + + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," // 建议文本2 + + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," // 建议图标 + + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," // 建议动作 + + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; // 建议数据 + // 便签片段搜索查询SQL private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION - + " FROM " + TABLE.NOTE - + " WHERE " + NoteColumns.SNIPPET + " LIKE ?" - + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER - + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; + + " FROM " + TABLE.NOTE // 从便签表查询 + + " WHERE " + NoteColumns.SNIPPET + " LIKE ?" // 按片段匹配 + + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER // 排除回收站中的便签 + + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; // 只查询普通便签类型 + /** + * 创建内容提供者时调用 + * @return 是否成功创建 + */ @Override public boolean onCreate() { - mHelper = NotesDatabaseHelper.getInstance(getContext()); + mHelper = NotesDatabaseHelper.getInstance(getContext()); // 获取数据库帮助类实例 return true; } + /** + * 查询方法 + * @param uri 请求的URI + * @param projection 要返回的列 + * @param selection 选择条件 + * @param selectionArgs 选择参数 + * @param sortOrder 排序方式 + * @return 查询结果的Cursor + */ @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, - String sortOrder) { + String sortOrder) { Cursor c = null; - SQLiteDatabase db = mHelper.getReadableDatabase(); + SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读数据库 String id = null; - switch (mMatcher.match(uri)) { - case URI_NOTE: + switch (mMatcher.match(uri)) { // 根据URI匹配不同操作 + case URI_NOTE: // 查询便签表 c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder); break; - case URI_NOTE_ITEM: + case URI_NOTE_ITEM: // 查询单个便签 id = uri.getPathSegments().get(1); c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; - case URI_DATA: + case URI_DATA: // 查询数据表 c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder); break; - case URI_DATA_ITEM: + case URI_DATA_ITEM: // 查询单个数据项 id = uri.getPathSegments().get(1); c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; - case URI_SEARCH: - case URI_SEARCH_SUGGEST: + case URI_SEARCH: // 搜索请求 + case URI_SEARCH_SUGGEST: // 搜索建议请求 if (sortOrder != null || projection != null) { throw new IllegalArgumentException( "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query"); } String searchString = null; - if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { + if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { // 处理搜索建议请求 if (uri.getPathSegments().size() > 1) { searchString = uri.getPathSegments().get(1); } - } else { + } else { // 处理普通搜索请求 searchString = uri.getQueryParameter("pattern"); } - if (TextUtils.isEmpty(searchString)) { + if (TextUtils.isEmpty(searchString)) { // 搜索字符串为空则返回null return null; } try { - searchString = String.format("%%%s%%", searchString); - c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, + searchString = String.format("%%%s%%", searchString); // 格式化搜索字符串 + c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, // 执行原始查询 new String[] { searchString }); } catch (IllegalStateException ex) { - Log.e(TAG, "got exception: " + ex.toString()); + Log.e(TAG, "got exception: " + ex.toString()); // 记录异常 } break; default: - throw new IllegalArgumentException("Unknown URI " + uri); + throw new IllegalArgumentException("Unknown URI " + uri); // 未知URI抛出异常 } if (c != null) { - c.setNotificationUri(getContext().getContentResolver(), uri); + c.setNotificationUri(getContext().getContentResolver(), uri); // 设置通知URI } return c; } + /** + * 插入方法 + * @param uri 请求的URI + * @param values 要插入的值 + * @return 新插入项的URI + */ @Override public Uri insert(Uri uri, ContentValues values) { - SQLiteDatabase db = mHelper.getWritableDatabase(); + SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库 long dataId = 0, noteId = 0, insertedId = 0; - switch (mMatcher.match(uri)) { - case URI_NOTE: + switch (mMatcher.match(uri)) { // 根据URI匹配不同操作 + case URI_NOTE: // 插入便签 insertedId = noteId = db.insert(TABLE.NOTE, null, values); break; - case URI_DATA: - if (values.containsKey(DataColumns.NOTE_ID)) { + case URI_DATA: // 插入数据 + if (values.containsKey(DataColumns.NOTE_ID)) { // 检查是否包含便签ID noteId = values.getAsLong(DataColumns.NOTE_ID); } else { - Log.d(TAG, "Wrong data format without note id:" + values.toString()); + Log.d(TAG, "Wrong data format without note id:" + values.toString()); // 记录格式错误 } insertedId = dataId = db.insert(TABLE.DATA, null, values); break; default: - throw new IllegalArgumentException("Unknown URI " + uri); + throw new IllegalArgumentException("Unknown URI " + uri); // 未知URI抛出异常 } - // Notify the note uri + // 通知便签URI变化 if (noteId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); } - // Notify the data uri + // 通知数据URI变化 if (dataId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null); } - return ContentUris.withAppendedId(uri, insertedId); + return ContentUris.withAppendedId(uri, insertedId); // 返回新插入项的URI } + /** + * 删除方法 + * @param uri 请求的URI + * @param selection 选择条件 + * @param selectionArgs 选择参数 + * @return 删除的行数 + */ @Override public int delete(Uri uri, String selection, String[] selectionArgs) { int count = 0; String id = null; - SQLiteDatabase db = mHelper.getWritableDatabase(); + SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库 boolean deleteData = false; - switch (mMatcher.match(uri)) { - case URI_NOTE: - selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; + switch (mMatcher.match(uri)) { // 根据URI匹配不同操作 + case URI_NOTE: // 删除便签 + selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; // 只允许删除ID大于0的便签 count = db.delete(TABLE.NOTE, selection, selectionArgs); break; - case URI_NOTE_ITEM: + case URI_NOTE_ITEM: // 删除单个便签 id = uri.getPathSegments().get(1); /** - * ID that smaller than 0 is system folder which is not allowed to - * trash + * ID小于0的是系统文件夹，不允许删除 */ long noteId = Long.valueOf(id); if (noteId <= 0) { @@ -205,101 +238,124 @@ public class NotesProvider extends ContentProvider { count = db.delete(TABLE.NOTE, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; - case URI_DATA: + case URI_DATA: // 删除数据 count = db.delete(TABLE.DATA, selection, selectionArgs); deleteData = true; break; - case URI_DATA_ITEM: + case URI_DATA_ITEM: // 删除单个数据项 id = uri.getPathSegments().get(1); count = db.delete(TABLE.DATA, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); deleteData = true; break; default: - throw new IllegalArgumentException("Unknown URI " + uri); + throw new IllegalArgumentException("Unknown URI " + uri); // 未知URI抛出异常 } - if (count > 0) { + if (count > 0) { // 如果删除了数据 if (deleteData) { - getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); + getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); // 通知便签URI变化 } - getContext().getContentResolver().notifyChange(uri, null); + getContext().getContentResolver().notifyChange(uri, null); // 通知当前URI变化 } return count; } + /** + * 更新方法 + * @param uri 请求的URI + * @param values 要更新的值 + * @param selection 选择条件 + * @param selectionArgs 选择参数 + * @return 更新的行数 + */ @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { int count = 0; String id = null; - SQLiteDatabase db = mHelper.getWritableDatabase(); + SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库 boolean updateData = false; - switch (mMatcher.match(uri)) { - case URI_NOTE: - increaseNoteVersion(-1, selection, selectionArgs); + switch (mMatcher.match(uri)) { // 根据URI匹配不同操作 + case URI_NOTE: // 更新便签 + increaseNoteVersion(-1, selection, selectionArgs); // 增加便签版本 count = db.update(TABLE.NOTE, values, selection, selectionArgs); break; - case URI_NOTE_ITEM: + case URI_NOTE_ITEM: // 更新单个便签 id = uri.getPathSegments().get(1); - increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); + increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 增加便签版本 count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; - case URI_DATA: + case URI_DATA: // 更新数据 count = db.update(TABLE.DATA, values, selection, selectionArgs); updateData = true; break; - case URI_DATA_ITEM: + case URI_DATA_ITEM: // 更新单个数据项 id = uri.getPathSegments().get(1); count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); updateData = true; break; default: - throw new IllegalArgumentException("Unknown URI " + uri); + throw new IllegalArgumentException("Unknown URI " + uri); // 未知URI抛出异常 } - if (count > 0) { + if (count > 0) { // 如果更新了数据 if (updateData) { - getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); + getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); // 通知便签URI变化 } - getContext().getContentResolver().notifyChange(uri, null); + getContext().getContentResolver().notifyChange(uri, null); // 通知当前URI变化 } return count; } + /** + * 解析选择条件，添加AND连接符 + * @param selection 原始选择条件 + * @return 解析后的选择条件 + */ private String parseSelection(String selection) { return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); } + /** + * 增加便签版本号 + * @param id 便签ID，-1表示不指定 + * @param selection 选择条件 + * @param selectionArgs 选择参数 + */ private void increaseNoteVersion(long id, String selection, String[] selectionArgs) { StringBuilder sql = new StringBuilder(120); sql.append("UPDATE "); sql.append(TABLE.NOTE); sql.append(" SET "); sql.append(NoteColumns.VERSION); - sql.append("=" + NoteColumns.VERSION + "+1 "); + sql.append("=" + NoteColumns.VERSION + "+1 "); // 版本号加1 - if (id > 0 || !TextUtils.isEmpty(selection)) { + if (id > 0 || !TextUtils.isEmpty(selection)) { // 如果有ID或选择条件 sql.append(" WHERE "); } - if (id > 0) { + if (id > 0) { // 如果指定了ID sql.append(NoteColumns.ID + "=" + String.valueOf(id)); } - if (!TextUtils.isEmpty(selection)) { + if (!TextUtils.isEmpty(selection)) { // 如果有选择条件 String selectString = id > 0 ? parseSelection(selection) : selection; - for (String args : selectionArgs) { + for (String args : selectionArgs) { // 替换参数 selectString = selectString.replaceFirst("\\?", args); } sql.append(selectString); } - mHelper.getWritableDatabase().execSQL(sql.toString()); + mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行SQL } + /** + * 获取URI对应的MIME类型 + * @param uri 请求的URI + * @return MIME类型字符串 + */ @Override public String getType(Uri uri) { // TODO Auto-generated method stub return null; } - -} +} \ No newline at end of file