From 25fe9a4dcafd2fe7ba9595b63826ffef41a9aabe Mon Sep 17 00:00:00 2001 From: laimaxgg <793180380@qq.com> Date: Thu, 5 Jun 2025 15:50:00 +0800 Subject: [PATCH] =?UTF-8?q?=E7=BB=B4=E6=8A=A4noteprovider?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../net/micode/notes/data/NotesProvider.java | 410 +++++++++--------- 1 file changed, 212 insertions(+), 198 deletions(-) diff --git a/src/Notesmaster/app/src/main/java/net/micode/notes/data/NotesProvider.java b/src/Notesmaster/app/src/main/java/net/micode/notes/data/NotesProvider.java index 14b16a3..98cb0c5 100644 --- a/src/Notesmaster/app/src/main/java/net/micode/notes/data/NotesProvider.java +++ b/src/Notesmaster/app/src/main/java/net/micode/notes/data/NotesProvider.java @@ -1,302 +1,316 @@ /* - * 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. + * 这个类为笔记应用提供了一个内容提供者，用于管理数据。 + * 它通过 CRUD 操作与底层的 SQLite 数据库进行交互。 */ +package net.micode.notes.data; -package net.micode.notes.data; // 包名，表示该类属于数据层 +import android.app.SearchManager; +import android.content.ContentProvider; +import android.content.ContentUris; +import android.content.ContentValues; +import android.content.Intent; +import android.content.UriMatcher; +import android.database.Cursor; +import android.database.sqlite.SQLiteDatabase; +import android.net.Uri; +import android.text.TextUtils; +import android.util.Log; -import android.app.SearchManager; // 导入搜索管理器类 -import android.content.ContentProvider; // 导入内容提供者类 -import android.content.ContentUris; // 导入内容URI处理类 -import android.content.ContentValues; // 导入内容值类 -import android.content.Intent; // 导入意图类 -import android.content.UriMatcher; // 导入URI匹配器类 -import android.database.Cursor; // 导入游标类 -import android.database.sqlite.SQLiteDatabase; // 导入SQLite数据库类 -import android.net.Uri; // 导入URI类 -import android.text.TextUtils; // 导入文本工具类 -import android.util.Log; // 导入日志工具类 +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; -import net.micode.notes.R; // 导入资源类 -import net.micode.notes.data.Notes.DataColumns; // 导入数据列类 -import net.micode.notes.data.Notes.NoteColumns; // 导入笔记列类 -import net.micode.notes.data.NotesDatabaseHelper.TABLE; // 导入数据库表类 +public class NotesProvider extends ContentProvider { + // 定义用于 URI 匹配的常量 + private static final UriMatcher mMatcher; -public class NotesProvider extends ContentProvider { // 笔记内容提供者类 - private static final UriMatcher mMatcher; // URI匹配器实例 + // 数据库帮助类实例 + private NotesDatabaseHelper mHelper; - private NotesDatabaseHelper mHelper; // 数据库助手实例 + // 日志标签 + private static final String TAG = "NotesProvider"; - private static final String TAG = "NotesProvider"; // 日志标签 - - private static final int URI_NOTE = 1; // 笔记URI常量 - private static final int URI_NOTE_ITEM = 2; // 笔记项URI常量 - private static final int URI_DATA = 3; // 数据URI常量 - private static final int URI_DATA_ITEM = 4; // 数据项URI常量 - - private static final int URI_SEARCH = 5; // 搜索URI常量 - private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议URI常量 + // URI 代码 + 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; + // 初始化 UriMatcher static { - mMatcher = new UriMatcher(UriMatcher.NO_MATCH); // 初始化URI匹配器 - mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // 添加笔记URI - mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 添加笔记项URI - mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 添加数据URI - mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 添加数据项URI - mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 添加搜索URI - mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 添加搜索建议URI - mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); // 添加搜索建议URI + 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); } - /** - * x'0A' 表示 sqlite 中的 '\n' 字符。为了在搜索结果中显示更多信息， - * 我们将修剪 '\n' 和空格。 - */ - private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," // 笔记ID - + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," // 笔记ID作为额外数据 - + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + "," // 修剪后的摘要作为文本1 - + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," // 修剪后的摘要作为文本2 - + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," // 搜索结果图标 - + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," // 意图动作为查看 - + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; // 意图数据类型 + // 用于搜索建议的投影 + 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 String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION // 笔记摘要搜索查询 - + " FROM " + TABLE.NOTE // 从笔记表中选择 - + " WHERE " + NoteColumns.SNIPPET + " LIKE ?" // 摘要匹配条件 - + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER // 排除垃圾箱 - + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; // 笔记类型条件 + // 用于搜索笔记的 SQL 查询 + 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; + // onCreate 方法 @Override - public boolean onCreate() { // 创建内容提供者 - mHelper = NotesDatabaseHelper.getInstance(getContext()); // 获取数据库助手实例 - return true; // 返回成功 + public boolean onCreate() { + mHelper = NotesDatabaseHelper.getInstance(getContext()); + return true; } + // 查询方法 @Override - public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, // 查询方法 - String sortOrder) { - Cursor c = null; // 游标初始化 - SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读数据库 - String id = null; // ID初始化 - switch (mMatcher.match(uri)) { // 根据URI匹配 - case URI_NOTE: // 笔记查询 - c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, // 查询笔记表 + public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, + String sortOrder) { + Cursor c = null; + SQLiteDatabase db = mHelper.getReadableDatabase(); + String id = null; + switch (mMatcher.match(uri)) { + // 处理笔记的查询 + case URI_NOTE: + c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder); break; - case URI_NOTE_ITEM: // 笔记项查询 - id = uri.getPathSegments().get(1); // 获取笔记ID - c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id // 查询特定笔记 + // 处理特定笔记的查询 + case URI_NOTE_ITEM: + id = uri.getPathSegments().get(1); + c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; - case URI_DATA: // 数据查询 - c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, // 查询数据表 + // 处理数据的查询 + case URI_DATA: + c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder); break; - case URI_DATA_ITEM: // 数据项查询 - id = uri.getPathSegments().get(1); // 获取数据ID - c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id // 查询特定数据 + // 处理特定数据项的查询 + case URI_DATA_ITEM: + id = uri.getPathSegments().get(1); + c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; - case URI_SEARCH: // 搜索查询 - case URI_SEARCH_SUGGEST: // 搜索建议查询 - if (sortOrder != null || projection != null) { // 不允许指定排序或投影 + // 处理搜索查询 + case URI_SEARCH: + case URI_SEARCH_SUGGEST: + if (sortOrder != null || projection != null) { throw new IllegalArgumentException( "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query"); } - - String searchString = null; // 搜索字符串初始化 - if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { // 如果是搜索建议 + // 提取搜索查询字符串 + String searchString = null; + if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { if (uri.getPathSegments().size() > 1) { - searchString = uri.getPathSegments().get(1); // 获取搜索字符串 + searchString = uri.getPathSegments().get(1); } } else { - searchString = uri.getQueryParameter("pattern"); // 从查询参数获取搜索字符串 + searchString = uri.getQueryParameter("pattern"); } - - if (TextUtils.isEmpty(searchString)) { // 如果搜索字符串为空 - return null; // 返回空 + if (TextUtils.isEmpty(searchString)) { + return null; } - + // 执行搜索查询 try { - searchString = String.format("%%%s%%", searchString); // 格式化搜索字符串 - c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, // 执行搜索查询 + searchString = String.format("%%%s%%", searchString); + c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, new String[] { searchString }); - } catch (IllegalStateException ex) { // 捕获异常 - Log.e(TAG, "got exception: " + ex.toString()); // 记录错误日志 + } catch (IllegalStateException ex) { + Log.e(TAG, "got exception: " + ex.toString()); } break; - default: // 未知URI处理 + default: throw new IllegalArgumentException("Unknown URI " + uri); } - if (c != null) { // 如果游标不为空 - c.setNotificationUri(getContext().getContentResolver(), uri); // 设置通知URI + if (c != null) { + c.setNotificationUri(getContext().getContentResolver(), uri); } - return c; // 返回游标 + return c; } + // 插入方法 @Override - public Uri insert(Uri uri, ContentValues values) { // 插入方法 - SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库 - long dataId = 0, noteId = 0, insertedId = 0; // ID初始化 - switch (mMatcher.match(uri)) { // 根据URI匹配 - case URI_NOTE: // 插入笔记 - insertedId = noteId = db.insert(TABLE.NOTE, null, values); // 插入笔记表 + public Uri insert(Uri uri, ContentValues values) { + SQLiteDatabase db = mHelper.getWritableDatabase(); + long dataId = 0, noteId = 0, insertedId = 0; + switch (mMatcher.match(uri)) { + // 处理笔记的插入 + case URI_NOTE: + insertedId = noteId = db.insert(TABLE.NOTE, null, values); break; - case URI_DATA: // 插入数据 - if (values.containsKey(DataColumns.NOTE_ID)) { // 如果包含笔记ID - noteId = values.getAsLong(DataColumns.NOTE_ID); // 获取笔记ID + // 处理数据的插入 + case URI_DATA: + if (values.containsKey(DataColumns.NOTE_ID)) { + noteId = values.getAsLong(DataColumns.NOTE_ID); } else { - Log.d(TAG, "Wrong data format without note id:" + values.toString()); // 记录错误日志 + Log.d(TAG, "Wrong data format without note id:" + values.toString()); } - insertedId = dataId = db.insert(TABLE.DATA, null, values); // 插入数据表 + insertedId = dataId = db.insert(TABLE.DATA, null, values); break; - default: // 未知URI处理 + default: throw new IllegalArgumentException("Unknown URI " + uri); } - // 通知笔记URI + // + // 通知内容解析器有变化 if (noteId > 0) { - getContext().getContentResolver().notifyChange( // 通知内容解析器 + getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); } - // 通知数据URI + // 通知数据 URI 有变化 if (dataId > 0) { - getContext().getContentResolver().notifyChange( // 通知内容解析器 + getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null); } - return ContentUris.withAppendedId(uri, insertedId); // 返回插入的URI + return ContentUris.withAppendedId(uri, insertedId); } + // 删除方法 @Override - public int delete(Uri uri, String selection, String[] selectionArgs) { // 删除方法 - int count = 0; // 删除计数 - String id = null; // ID初始化 - SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库 - boolean deleteData = false; // 数据删除标志 - switch (mMatcher.match(uri)) { // 根据URI匹配 - case URI_NOTE: // 删除笔记 - selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; // 添加条件 - count = db.delete(TABLE.NOTE, selection, selectionArgs); // 删除笔记表 + public int delete(Uri uri, String selection, String[] selectionArgs) { + int count = 0; + String id = null; + SQLiteDatabase db = mHelper.getWritableDatabase(); + boolean deleteData = false; + switch (mMatcher.match(uri)) { + // 处理笔记的删除 + case URI_NOTE: + selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; + count = db.delete(TABLE.NOTE, selection, selectionArgs); break; - case URI_NOTE_ITEM: // 删除笔记项 - id = uri.getPathSegments().get(1); // 获取笔记ID + // 处理特定笔记的删除 + case URI_NOTE_ITEM: + id = uri.getPathSegments().get(1); /** - * ID 小于 0 的是系统文件夹，不允许删除 + * ID that smaller than 0 is system folder which is not allowed to + * trash */ - long noteId = Long.valueOf(id); // 转换ID - if (noteId <= 0) { // 如果ID小于等于0 - break; // 退出 + long noteId = Long.valueOf(id); + if (noteId <= 0) { + break; } - count = db.delete(TABLE.NOTE, // 删除特定笔记 + count = db.delete(TABLE.NOTE, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; - case URI_DATA: // 删除数据 - count = db.delete(TABLE.DATA, selection, selectionArgs); // 删除数据表 - deleteData = true; // 设置数据删除标志 + // 处理数据的删除 + case URI_DATA: + count = db.delete(TABLE.DATA, selection, selectionArgs); + deleteData = true; break; - case URI_DATA_ITEM: // 删除数据项 - id = uri.getPathSegments().get(1); // 获取数据ID - count = db.delete(TABLE.DATA, // 删除特定数据 + // 处理特定数据项的删除 + case URI_DATA_ITEM: + id = uri.getPathSegments().get(1); + count = db.delete(TABLE.DATA, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); - deleteData = true; // 设置数据删除标志 + deleteData = true; break; - default: // 未知URI处理 + default: throw new IllegalArgumentException("Unknown URI " + uri); } - if (count > 0) { // 如果删除成功 - if (deleteData) { // 如果删除的是数据 - getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); // 通知笔记URI + if (count > 0) { + if (deleteData) { + getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); } - getContext().getContentResolver().notifyChange(uri, null); // 通知当前URI + getContext().getContentResolver().notifyChange(uri, null); } - return count; // 返回删除计数 + return count; } + // 更新方法 @Override - public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { // 更新方法 - int count = 0; // 更新计数 - String id = null; // ID初始化 - SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库 - boolean updateData = false; // 数据更新标志 - switch (mMatcher.match(uri)) { // 根据URI匹配 - case URI_NOTE: // 更新笔记 - increaseNoteVersion(-1, selection, selectionArgs); // 增加笔记版本 - count = db.update(TABLE.NOTE, values, selection, selectionArgs); // 更新笔记表 + public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { + int count = 0; + String id = null; + SQLiteDatabase db = mHelper.getWritableDatabase(); + boolean updateData = false; + switch (mMatcher.match(uri)) { + // 处理笔记的更新 + case URI_NOTE: + increaseNoteVersion(-1, selection, selectionArgs); + count = db.update(TABLE.NOTE, values, selection, selectionArgs); break; - case URI_NOTE_ITEM: // 更新笔记项 - id = uri.getPathSegments().get(1); // 获取笔记ID - increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 增加笔记版本 - count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id // 更新特定笔记 + // 处理特定笔记的更新 + case URI_NOTE_ITEM: + id = uri.getPathSegments().get(1); + increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); + count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; - case URI_DATA: // 更新数据 - count = db.update(TABLE.DATA, values, selection, selectionArgs); // 更新数据表 - updateData = true; // 设置数据更新标志 + // 处理数据的更新 + case URI_DATA: + count = db.update(TABLE.DATA, values, selection, selectionArgs); + updateData = true; break; - case URI_DATA_ITEM: // 更新数据项 - id = uri.getPathSegments().get(1); // 获取数据ID - count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id // 更新特定数据 + // 处理特定数据项的更新 + case URI_DATA_ITEM: + id = uri.getPathSegments().get(1); + count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); - updateData = true; // 设置数据更新标志 + updateData = true; break; - default: // 未知URI处理 + default: throw new IllegalArgumentException("Unknown URI " + uri); } - if (count > 0) { // 如果更新成功 - if (updateData) { // 如果更新的是数据 - getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); // 通知笔记URI + if (count > 0) { + if (updateData) { + getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); } - getContext().getContentResolver().notifyChange(uri, null); // 通知当前URI + getContext().getContentResolver().notifyChange(uri, null); } - return count; // 返回更新计数 + return count; } - private String parseSelection(String selection) { // 解析选择条件 - return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); // 返回条件 + // 解析选择方法 + private String parseSelection(String selection) { + return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); } - private void increaseNoteVersion(long id, String selection, String[] selectionArgs) { // 增加笔记版本 - StringBuilder sql = new StringBuilder(120); // SQL语句构建器 - sql.append("UPDATE "); // 更新语句 - sql.append(TABLE.NOTE); // 更新笔记表 - sql.append(" SET "); // 设置字段 - sql.append(NoteColumns.VERSION); // 笔记版本字段 - sql.append("=" + NoteColumns.VERSION + "+1 "); // 增加版本 + // 增加笔记版本方法 + 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 "); - if (id > 0 || !TextUtils.isEmpty(selection)) { // 如果有ID或选择条件 - sql.append(" WHERE "); // 添加WHERE条件 + if (id > 0 || !TextUtils.isEmpty(selection)) { + sql.append(" WHERE "); } - if (id > 0) { // 如果有ID - sql.append(NoteColumns.ID + "=" + String.valueOf(id)); // 添加ID条件 + if (id > 0) { + sql.append(NoteColumns.ID + "=" + String.valueOf(id)); } - if (!TextUtils.isEmpty(selection)) { // 如果有选择条件 - String selectString = id > 0 ? parseSelection(selection) : selection; // 解析选择条件 - for (String args : selectionArgs) { // 替换参数 + if (!TextUtils.isEmpty(selection)) { + String selectString = id > 0 ? parseSelection(selection) : selection; + for (String args : selectionArgs) { selectString = selectString.replaceFirst("\\?", args); } - sql.append(selectString); // 添加选择条件 + sql.append(selectString); } - mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行SQL语句 + mHelper.getWritableDatabase().execSQL(sql.toString()); } + // 获取类型方法 @Override - public String getType(Uri uri) { // 获取类型方法 - // TODO Auto-generated method stub - return null; // 返回空 + public String getType(Uri uri) { + // 暂不实现 + return null; } -} \ No newline at end of file +}