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@ -34,23 +34,17 @@ import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.NoteColumns;
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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.data.NotesDatabaseHelper.TABLE;
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/*
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//为存储和获取数据提供接口。可以在不同的应用程序之间共享数据
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* 功能描述：用于提供对便签数据的存储和获取功能，实现了创建、读取、更新、删除操作，以便其他组件可以通过 ContentResolver 访问和管理便签数据。
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//ContentProvider提供的方法
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* */
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//query：查询
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//insert：插入
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//update：更新
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//delete：删除
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//getType：得到数据类型
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public class NotesProvider extends ContentProvider {
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public class NotesProvider extends ContentProvider {
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// UriMatcher用于匹配Uri
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private static final UriMatcher mMatcher;// UriMatcher用于匹配Uri
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private static final UriMatcher mMatcher;
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private NotesDatabaseHelper mHelper;
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private NotesDatabaseHelper mHelper;// 数据库帮助类
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private static final String TAG = "NotesProvider";
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private static final String TAG = "NotesProvider";// 标签
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private static final int URI_NOTE = 1;
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private static final int URI_NOTE = 1;// Uri匹配码
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private static final int URI_NOTE_ITEM = 2;
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private static final int URI_NOTE_ITEM = 2;
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private static final int URI_DATA = 3;
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private static final int URI_DATA = 3;
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private static final int URI_DATA_ITEM = 4;
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private static final int URI_DATA_ITEM = 4;
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@ -59,16 +53,17 @@ public class NotesProvider extends ContentProvider {
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private static final int URI_SEARCH_SUGGEST = 6;
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private static final int URI_SEARCH_SUGGEST = 6;
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static {
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static {
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// 创建UriMatcher时，调用UriMatcher(UriMatcher.NO_MATCH)表示不匹配任何路径的返回码
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);// 创建UriMatcher时，调用UriMatcher(UriMatcher.NO_MATCH)表示不匹配任何路径的返回码
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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/*
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// 把需要匹配Uri路径全部给注册上
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* 把需要匹配Uri路径全部给注册上
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mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
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* */
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
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mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);// 便签列表的路径
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);// 便签详情的路径，其中 "#" 表示数字，表示具体的便签 ID
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);// 数据列表的路径
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);// 数据详情的路径，其中 "#" 表示数字，表示具体的数据 ID
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);// 搜索的路径
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);// 搜索建议的路径
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);// 带搜索关键字的搜索建议的路径
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}
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}
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/**
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/**
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@ -76,7 +71,9 @@ public class NotesProvider extends ContentProvider {
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* we will trim '\n' and white space in order to show more information.
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* we will trim '\n' and white space in order to show more information.
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*/
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*/
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// 声明 NOTES_SEARCH_PROJECTION
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/*
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* 查询搜索结果的投影。该投影包含了搜索结果需要的各个字段，如便签的 ID、搜索文本等
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* */
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private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
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private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
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+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
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+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
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+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
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+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
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@ -85,7 +82,9 @@ public class NotesProvider extends ContentProvider {
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+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
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+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
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+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
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+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
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// 声明NOTES_SNIPPET_SEARCH_QUERY
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/*
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* 查询语句，用于查询搜索结果
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* */
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private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
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private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
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+ " FROM " + TABLE.NOTE
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+ " FROM " + TABLE.NOTE
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+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
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+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
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@ -93,249 +92,268 @@ public class NotesProvider extends ContentProvider {
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+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
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+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
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@Override
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@Override
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// Context只有在onCreate()中才被初始化
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/*
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// 对mHelper进行实例化
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*在onCreate()中初始化Context，实例化mHelper
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* */
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public boolean onCreate() {
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public boolean onCreate() {
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mHelper = NotesDatabaseHelper.getInstance(getContext());
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mHelper = NotesDatabaseHelper.getInstance(getContext());
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return true;
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return true;
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}
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}
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@Override
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@Override
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// 查询uri在数据库中对应的位置
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/*
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* 根据传入的Uri进行数据库查询操作
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* */
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public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
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public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
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String sortOrder) {
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String sortOrder) {
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Cursor c = null;
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Cursor c = null;// 定义一个Cursor对象用于存放查询结果
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// 获取可读数据库
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SQLiteDatabase db = mHelper.getReadableDatabase();// 获取可读数据库实例
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SQLiteDatabase db = mHelper.getReadableDatabase();
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String id = null;// 用于存放ID值
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String id = null;
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/*
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// 匹配查找uri
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* 根据Uri使用Matcher匹配相应的操作，对于不同的匹配值，在数据库中查找相应的条目
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* */
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switch (mMatcher.match(uri)) {
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switch (mMatcher.match(uri)) {
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// 对于不同的匹配值，在数据库中查找相应的条目
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case URI_NOTE:
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case URI_NOTE:
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c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
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c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
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sortOrder);
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sortOrder);// 查询便签列表
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break;
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break;
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case URI_NOTE_ITEM:
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case URI_NOTE_ITEM:
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id = uri.getPathSegments().get(1);
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id = uri.getPathSegments().get(1);// 获取Uri中的ID值
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c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
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c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs, null, null, sortOrder);
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+ parseSelection(selection), selectionArgs, null, null, sortOrder);// 查询特定ID的便签详情
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break;
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break;
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case URI_DATA:
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case URI_DATA:
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c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
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c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
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sortOrder);
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sortOrder);// 查询数据列表
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break;
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break;
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case URI_DATA_ITEM:
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case URI_DATA_ITEM:
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id = uri.getPathSegments().get(1);
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id = uri.getPathSegments().get(1); // 获取Uri中的ID值
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c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
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c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs, null, null, sortOrder);
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+ parseSelection(selection), selectionArgs, null, null, sortOrder);// 查询特定ID的数据详情
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break;
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break;
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case URI_SEARCH:
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case URI_SEARCH:
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case URI_SEARCH_SUGGEST:
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case URI_SEARCH_SUGGEST:
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if (sortOrder != null || projection != null) {
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if (sortOrder != null || projection != null) {
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// 不合法的参数异常
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throw new IllegalArgumentException(
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throw new IllegalArgumentException(
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"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
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"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");// 如果存在不合法的参数则抛出异常
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}
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}
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String searchString = null;
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String searchString = null;
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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
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if (uri.getPathSegments().size() > 1) {
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if (uri.getPathSegments().size() > 1) {
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// getPathSegments()方法得到一个String的List，
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searchString = uri.getPathSegments().get(1); // 获取搜索关键字
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// 在uri.getPathSegments().get(1)为第2个元素
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searchString = uri.getPathSegments().get(1);
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}
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}
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} else {
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} else {
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searchString = uri.getQueryParameter("pattern");
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searchString = uri.getQueryParameter("pattern"); // 获取搜索关键字
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}
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}
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if (TextUtils.isEmpty(searchString)) {
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if (TextUtils.isEmpty(searchString)) {
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return null;
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return null;// 如果搜索关键字为空则直接返回null
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}
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}
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try {
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try {
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searchString = String.format("%%%s%%", searchString);
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searchString = String.format("%%%s%%", searchString);// 格式化搜索关键字
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c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
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c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
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new String[] { searchString });
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new String[] { searchString });// 执行搜索查询
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} catch (IllegalStateException ex) {
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} catch (IllegalStateException ex) {
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Log.e(TAG, "got exception: " + ex.toString());
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Log.e(TAG, "got exception: " + ex.toString());// 捕获异常
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}
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}
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break;
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break;
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default:
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default:
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// 抛出异常
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throw new IllegalArgumentException("Unknown URI " + uri);// 对于未知的Uri抛出异常
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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}
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if (c != null) {
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if (c != null) {
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c.setNotificationUri(getContext().getContentResolver(), uri);
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c.setNotificationUri(getContext().getContentResolver(), uri);// 设置查询结果的变更通知URI
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}
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}
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return c;
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return c;// 返回查询结果的Cursor对象
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}
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}
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@Override
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@Override
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// 插入一个uri
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/*
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* 功能描述：实现对数据库表单的增加记录操作
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* 输入参数：参数 uri 表示插入的 URI，values 表示插入的值
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* */
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public Uri insert(Uri uri, ContentValues values) {
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public Uri insert(Uri uri, ContentValues values) {
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// 获得可写的数据库
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SQLiteDatabase db = mHelper.getWritableDatabase();// 获得可写的数据库
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SQLiteDatabase db = mHelper.getWritableDatabase();
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long dataId = 0, noteId = 0, insertedId = 0;// 定义三个id值变量
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long dataId = 0, noteId = 0, insertedId = 0;
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/*
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* 根据Uri使用Matcher匹配相应的操作
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* */
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switch (mMatcher.match(uri)) {
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switch (mMatcher.match(uri)) {
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// 新增一个条目
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case URI_NOTE:
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case URI_NOTE:
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insertedId = noteId = db.insert(TABLE.NOTE, null, values);
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insertedId = noteId = db.insert(TABLE.NOTE, null, values);// 在便签表中插入新记录
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break;
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break;
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// 如果存在，查找NOTE_ID
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case URI_DATA:
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case URI_DATA:
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if (values.containsKey(DataColumns.NOTE_ID)) {
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if (values.containsKey(DataColumns.NOTE_ID)) {
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noteId = values.getAsLong(DataColumns.NOTE_ID);
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noteId = values.getAsLong(DataColumns.NOTE_ID);// 如果数据内容包含NOTE_ID字段，获取NOTE_ID值
|
|
|
|
} else {
|
|
|
|
} else {
|
|
|
|
Log.d(TAG, "Wrong data format without note id:" + values.toString());
|
|
|
|
Log.d(TAG, "Wrong data format without note id:" + values.toString());// 如果不包含则输出日志信息
|
|
|
|
}
|
|
|
|
}
|
|
|
|
insertedId = dataId = db.insert(TABLE.DATA, null, values);
|
|
|
|
insertedId = dataId = db.insert(TABLE.DATA, null, values);// 在数据表中插入新记录
|
|
|
|
break;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
default:
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri);
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri);// 对于未知的Uri抛出异常
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// Notify the note uri
|
|
|
|
// Notify the note uri
|
|
|
|
// notifyChange获得一个ContextResolver对象并且更新里面的内容
|
|
|
|
if (noteId > 0) {// 如果是便签新增操作
|
|
|
|
if (noteId > 0) {
|
|
|
|
|
|
|
|
getContext().getContentResolver().notifyChange(
|
|
|
|
getContext().getContentResolver().notifyChange(
|
|
|
|
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
|
|
|
|
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);// 通过ContentResolver对象发送通知，更新便签的变更通知URI
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// Notify the data uri
|
|
|
|
// Notify the data uri
|
|
|
|
if (dataId > 0) {
|
|
|
|
if (dataId > 0) {// 如果是数据新增操作
|
|
|
|
getContext().getContentResolver().notifyChange(
|
|
|
|
getContext().getContentResolver().notifyChange(
|
|
|
|
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
|
|
|
|
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);// 通过ContentResolver对象发送通知，更新数据的变更通知URI
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// 返回插入的uri的路径
|
|
|
|
return ContentUris.withAppendedId(uri, insertedId);// 返回插入的uri的路径
|
|
|
|
return ContentUris.withAppendedId(uri, insertedId);
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
@Override
|
|
|
|
@Override
|
|
|
|
// 删除一个uri
|
|
|
|
/*
|
|
|
|
|
|
|
|
* 功能描述：实现对数据库表单的删除记录操作
|
|
|
|
|
|
|
|
* 输入参数：参数 uri 表示删除的 URI，selection 表示删除条件，selectionArgs 表示删除条件值
|
|
|
|
|
|
|
|
* */
|
|
|
|
public int delete(Uri uri, String selection, String[] selectionArgs) {
|
|
|
|
public int delete(Uri uri, String selection, String[] selectionArgs) {
|
|
|
|
//Uri代表要操作的数据，Android上可用的每种资源 -包括 图像、视频片段、音频资源等都可以用Uri来表示
|
|
|
|
//Uri代表要操作的数据，Android上可用的每种资源 -包括 图像、视频片段、音频资源等都可以用Uri来表示
|
|
|
|
int count = 0;
|
|
|
|
int count = 0;// 定义计数变量
|
|
|
|
String id = null;
|
|
|
|
String id = null;// 定义id字符串变量
|
|
|
|
// 获得可写的数据库
|
|
|
|
SQLiteDatabase db = mHelper.getWritableDatabase();// 获取可写数据库实例
|
|
|
|
SQLiteDatabase db = mHelper.getWritableDatabase();
|
|
|
|
boolean deleteData = false;// 是否删除数据标志位
|
|
|
|
boolean deleteData = false;
|
|
|
|
/*
|
|
|
|
|
|
|
|
* 根据Uri使用Matcher匹配相应的操作
|
|
|
|
|
|
|
|
* */
|
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
|
case URI_NOTE:
|
|
|
|
case URI_NOTE:
|
|
|
|
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
|
|
|
|
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";// 对于便签的删除操作，添加额外的条件限制
|
|
|
|
count = db.delete(TABLE.NOTE, selection, selectionArgs);
|
|
|
|
count = db.delete(TABLE.NOTE, selection, selectionArgs);// 在便签表中删除符合条件的记录
|
|
|
|
break;
|
|
|
|
break;
|
|
|
|
case URI_NOTE_ITEM:
|
|
|
|
case URI_NOTE_ITEM:
|
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
|
id = uri.getPathSegments().get(1);// 获取Uri中的ID参数
|
|
|
|
/**
|
|
|
|
/**
|
|
|
|
* ID that smaller than 0 is system folder which is not allowed to
|
|
|
|
* ID that smaller than 0 is system folder which is not allowed to
|
|
|
|
* trash
|
|
|
|
* trash
|
|
|
|
*/
|
|
|
|
*/
|
|
|
|
long noteId = Long.valueOf(id);
|
|
|
|
long noteId = Long.valueOf(id);
|
|
|
|
if (noteId <= 0) {
|
|
|
|
if (noteId <= 0) {// 如果ID小于等于0，则不允许删除
|
|
|
|
break;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
count = db.delete(TABLE.NOTE,
|
|
|
|
count = db.delete(TABLE.NOTE,
|
|
|
|
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
|
|
|
|
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);// 在便签表中删除指定ID的记录
|
|
|
|
break;
|
|
|
|
break;
|
|
|
|
case URI_DATA:
|
|
|
|
case URI_DATA:
|
|
|
|
count = db.delete(TABLE.DATA, selection, selectionArgs);
|
|
|
|
count = db.delete(TABLE.DATA, selection, selectionArgs);// 在数据表中删除符合条件的记录
|
|
|
|
deleteData = true;
|
|
|
|
deleteData = true;// 设置删除数据标志位为true
|
|
|
|
break;
|
|
|
|
break;
|
|
|
|
case URI_DATA_ITEM:
|
|
|
|
case URI_DATA_ITEM:
|
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
|
id = uri.getPathSegments().get(1);// 获取Uri中的ID参数
|
|
|
|
count = db.delete(TABLE.DATA,
|
|
|
|
count = db.delete(TABLE.DATA,
|
|
|
|
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
|
|
|
|
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);// 在数据表中删除指定ID的记录
|
|
|
|
deleteData = true;
|
|
|
|
deleteData = true;// 设置删除数据标志位为true
|
|
|
|
break;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
default:
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri);
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri);// 对于未知的Uri抛出异常
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (count > 0) {
|
|
|
|
if (count > 0) {// 如果删除记录数大于0
|
|
|
|
if (deleteData) {
|
|
|
|
if (deleteData) {
|
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);// 通过ContentResolver对象发送通知，更新便签变更通知URI
|
|
|
|
}
|
|
|
|
}
|
|
|
|
getContext().getContentResolver().notifyChange(uri, null);
|
|
|
|
getContext().getContentResolver().notifyChange(uri, null);// 通过ContentResolver对象发送通知，更新变更通知URI
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return count;
|
|
|
|
return count;// 返回删除的记录数
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
@Override
|
|
|
|
@Override
|
|
|
|
// 更新一个uri
|
|
|
|
/*
|
|
|
|
|
|
|
|
* 功能描述：实现对数据库表单的更新操作
|
|
|
|
|
|
|
|
* 输入参数：参数 uri 表示更新的 URI，values 表示更新的值，selection 表示更新条件，selectionArgs 表示更新条件值
|
|
|
|
|
|
|
|
* */
|
|
|
|
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
|
|
|
|
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
|
|
|
|
int count = 0;
|
|
|
|
int count = 0;// 定义计数变量
|
|
|
|
String id = null;
|
|
|
|
String id = null;// 定义id字符串变量
|
|
|
|
SQLiteDatabase db = mHelper.getWritableDatabase();
|
|
|
|
SQLiteDatabase db = mHelper.getWritableDatabase();// 获取可写数据库实例
|
|
|
|
boolean updateData = false;
|
|
|
|
boolean updateData = false;// 是否更新数据标志位
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
|
|
|
* 根据Uri使用Matcher匹配相应的操作
|
|
|
|
|
|
|
|
* */
|
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
|
case URI_NOTE:
|
|
|
|
case URI_NOTE:
|
|
|
|
increaseNoteVersion(-1, selection, selectionArgs);
|
|
|
|
increaseNoteVersion(-1, selection, selectionArgs);// 增加便签版本号，针对便签的更新操作，添加额外的条件限制
|
|
|
|
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
|
|
|
|
count = db.update(TABLE.NOTE, values, selection, selectionArgs);// 在便签表中更新符合条件的记录
|
|
|
|
break;
|
|
|
|
break;
|
|
|
|
case URI_NOTE_ITEM:
|
|
|
|
case URI_NOTE_ITEM:
|
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
|
id = uri.getPathSegments().get(1);// 获取Uri中的ID参数
|
|
|
|
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
|
|
|
|
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);// 增加便签版本号，针对便签的更新操作，添加额外的条件限制
|
|
|
|
count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
|
|
|
|
count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
|
|
|
|
+ parseSelection(selection), selectionArgs);
|
|
|
|
+ parseSelection(selection), selectionArgs);// 在便签表中更新指定ID的记录
|
|
|
|
break;
|
|
|
|
break;
|
|
|
|
case URI_DATA:
|
|
|
|
case URI_DATA:
|
|
|
|
count = db.update(TABLE.DATA, values, selection, selectionArgs);
|
|
|
|
count = db.update(TABLE.DATA, values, selection, selectionArgs);// 在数据表中更新符合条件的记录
|
|
|
|
updateData = true;
|
|
|
|
updateData = true;// 设置更新数据标志位为tru
|
|
|
|
break;
|
|
|
|
break;
|
|
|
|
case URI_DATA_ITEM:
|
|
|
|
case URI_DATA_ITEM:
|
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
|
id = uri.getPathSegments().get(1);// 获取Uri中的ID参数
|
|
|
|
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
|
|
|
|
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
|
|
|
|
+ parseSelection(selection), selectionArgs);
|
|
|
|
+ parseSelection(selection), selectionArgs);// 在数据表中更新指定ID的记录
|
|
|
|
updateData = true;
|
|
|
|
updateData = true;// 设置更新数据标志位为true
|
|
|
|
break;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
default:
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri);
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri);// 对于未知的Uri抛出异常
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
if (count > 0) {
|
|
|
|
if (count > 0) {// 如果更新记录数大于0
|
|
|
|
if (updateData) {
|
|
|
|
if (updateData) {
|
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);// 通过ContentResolver对象发送通知，更新便签变更通知URI
|
|
|
|
}
|
|
|
|
}
|
|
|
|
getContext().getContentResolver().notifyChange(uri, null);
|
|
|
|
getContext().getContentResolver().notifyChange(uri, null);// 通过ContentResolver对象发送通知，更新变更通知URI
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return count;
|
|
|
|
return count;// 返回更新的记录数
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// 将字符串解析成规定格式
|
|
|
|
/*
|
|
|
|
|
|
|
|
* 解析查询条件selection，如果selection不为空，则在其前面加上" AND "，用于拼接SQL语句
|
|
|
|
|
|
|
|
* */
|
|
|
|
private String parseSelection(String selection) {
|
|
|
|
private String parseSelection(String selection) {
|
|
|
|
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
|
|
|
|
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
//增加一个noteVersion
|
|
|
|
/*
|
|
|
|
|
|
|
|
* 根据传入的id和selection参数确定要更新的记录，并将版本号加1
|
|
|
|
|
|
|
|
* */
|
|
|
|
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
|
|
|
|
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
|
|
|
|
StringBuilder sql = new StringBuilder(120);
|
|
|
|
StringBuilder sql = new StringBuilder(120);// 创建一个StringBuilder对象，用于构建SQL语句
|
|
|
|
sql.append("UPDATE ");
|
|
|
|
sql.append("UPDATE ");// 构建UPDATE语句，指定要更新的表名
|
|
|
|
sql.append(TABLE.NOTE);
|
|
|
|
sql.append(TABLE.NOTE);// 表名
|
|
|
|
sql.append(" SET ");
|
|
|
|
sql.append(" SET ");// 指定要更新的字段和新的值
|
|
|
|
sql.append(NoteColumns.VERSION);
|
|
|
|
sql.append(NoteColumns.VERSION);// 字段名
|
|
|
|
sql.append("=" + NoteColumns.VERSION + "+1 ");
|
|
|
|
sql.append("=" + NoteColumns.VERSION + "+1 ");// 将版本号加1
|
|
|
|
|
|
|
|
|
|
|
|
if (id > 0 || !TextUtils.isEmpty(selection)) {
|
|
|
|
if (id > 0 || !TextUtils.isEmpty(selection)) {
|
|
|
|
sql.append(" WHERE ");
|
|
|
|
sql.append(" WHERE ");// 根据传入的参数决定是否添加WHERE子句
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (id > 0) {
|
|
|
|
if (id > 0) {
|
|
|
|
sql.append(NoteColumns.ID + "=" + String.valueOf(id));
|
|
|
|
sql.append(NoteColumns.ID + "=" + String.valueOf(id)); // 如果传入的id大于0，则表示只更新指定id的记录
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (!TextUtils.isEmpty(selection)) {
|
|
|
|
if (!TextUtils.isEmpty(selection)) {// 如果传入的selection不为空，则根据它来确定要更新的记录
|
|
|
|
String selectString = id > 0 ? parseSelection(selection) : selection;
|
|
|
|
String selectString = id > 0 ? parseSelection(selection) : selection;// 调用parseSelection方法将selection转换为SQL语句中的WHERE子句
|
|
|
|
for (String args : selectionArgs) {
|
|
|
|
for (String args : selectionArgs) {
|
|
|
|
selectString = selectString.replaceFirst("\\?", args);
|
|
|
|
selectString = selectString.replaceFirst("\\?", args);// 替换WHERE子句中的问号占位符为实际的参数值
|
|
|
|
}
|
|
|
|
}
|
|
|
|
sql.append(selectString);
|
|
|
|
sql.append(selectString);// 添加WHERE子句到SQL语句中
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// execSQL()方法可以执行insert、delete、update和CREATE TABLE之类有更改行为的SQL语句
|
|
|
|
// execSQL()方法可以执行insert、delete、update和CREATE TABLE之类有更改行为的SQL语句
|
|
|
|
mHelper.getWritableDatabase().execSQL(sql.toString());
|
|
|
|
mHelper.getWritableDatabase().execSQL(sql.toString());// 添加WHERE子句到SQL语句中
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
@Override
|
|
|
|
@Override
|
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/*
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* 功能描述：用于根据 URI 返回相应的 MIME 类型
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* 输入参数：参数 uri 表示查询或操作的 URI
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* 函数中是环境自动生成的，也可自己改写
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* */
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public String getType(Uri uri) {
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public String getType(Uri uri) {
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// TODO Auto-generated method stub
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// TODO Auto-generated method stub
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return null;
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return null;
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}
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}
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}
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}
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