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@ -36,22 +36,22 @@ import net.micode.notes.data.NotesDatabaseHelper.TABLE;
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public class NotesProvider extends ContentProvider {
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private static final UriMatcher mMatcher;
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private static final UriMatcher mMatcher; //UriMatcher类用于分辨数据表
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private NotesDatabaseHelper mHelper;
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private NotesDatabaseHelper mHelper; //建立NotesDatabaseHelper类对象
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private static final String TAG = "NotesProvider";
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private static final String TAG = "NotesProvider"; //设置类名值
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private static final int URI_NOTE = 1;
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private static final int URI_NOTE = 1; //设置便签uri
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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; //设置数据uri
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private static final int URI_DATA_ITEM = 4;
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private static final int URI_SEARCH = 5;
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private static final int URI_SEARCH = 5; //设置搜索uri
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private static final int URI_SEARCH_SUGGEST = 6;
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static {
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH); //进行初始化
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mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
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@ -59,48 +59,48 @@ public class NotesProvider extends ContentProvider {
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
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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);
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}
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} //将不同的uri与数值相匹配
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/**
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* x'0A' represents the '\n' character in sqlite. For title and content in the search result,
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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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*/ //用0A代表\n，为搜索结果换行
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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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+ "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_2 + ","
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+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
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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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private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
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+ " FROM " + TABLE.NOTE
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+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
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+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
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+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
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+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; //检索便签的sql语句，在列表中搜寻。使用Notes类中的接口与变量
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@Override
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public boolean onCreate() {
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mHelper = NotesDatabaseHelper.getInstance(getContext());
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return true;
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return true; //创建NotesDatabaseHelper类并返回成果标识
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}
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@Override
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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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Cursor c = null;
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SQLiteDatabase db = mHelper.getReadableDatabase();
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String sortOrder) { //负责查询数据，接受uri、返回烈、选择、排列方式
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Cursor c = null; //创建空游标，表示数据库操作结果集合
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SQLiteDatabase db = mHelper.getReadableDatabase(); //获取数据库对象
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String id = null;
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switch (mMatcher.match(uri)) {
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switch (mMatcher.match(uri)) { //确定uri类型
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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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sortOrder);
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sortOrder); //传参，进行标准查询
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break;
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case URI_NOTE_ITEM:
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id = uri.getPathSegments().get(1);
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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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break;
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break; //传参，对id进行查询
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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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sortOrder);
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@ -112,13 +112,13 @@ public class NotesProvider extends ContentProvider {
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break;
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case URI_SEARCH:
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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) { //检查是否指定排序方式
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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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}
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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) { //提取uri中搜索模式
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if (uri.getPathSegments().size() > 1) {
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searchString = uri.getPathSegments().get(1);
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}
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@ -133,43 +133,43 @@ public class NotesProvider extends ContentProvider {
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try {
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searchString = String.format("%%%s%%", searchString);
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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 }); //在Notes表进行搜索
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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()); //日志
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}
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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throw new IllegalArgumentException("Unknown URI " + uri); //抛出异常
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}
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if (c != null) {
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c.setNotificationUri(getContext().getContentResolver(), uri);
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}
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c.setNotificationUri(getContext().getContentResolver(), uri); //在游标查询的数据变化时进行通知
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} //通知uri是标识查询结果的uri，setNotificationUri方法可注册通知uri，与对象c相关联
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return c;
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}
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@Override
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public Uri insert(Uri uri, ContentValues values) {
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SQLiteDatabase db = mHelper.getWritableDatabase();
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public Uri insert(Uri uri, ContentValues values) { //uri表示要插入的uri，values表示要插入的数据
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SQLiteDatabase db = mHelper.getWritableDatabase(); //打开或创建一个数据库
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long dataId = 0, noteId = 0, insertedId = 0;
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switch (mMatcher.match(uri)) {
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switch (mMatcher.match(uri)) { //匹配uri
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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); //将数据插入到Notes表中
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break;
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case URI_DATA:
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if (values.containsKey(DataColumns.NOTE_ID)) {
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noteId = values.getAsLong(DataColumns.NOTE_ID);
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if (values.containsKey(DataColumns.NOTE_ID)) { //检查values是否含有NOTE_ID内容，返回bool值
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noteId = values.getAsLong(DataColumns.NOTE_ID); //关联noteId
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} else {
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Log.d(TAG, "Wrong data format without note id:" + values.toString());
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Log.d(TAG, "Wrong data format without note id:" + values.toString()); //日志记录
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}
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insertedId = dataId = db.insert(TABLE.DATA, null, values);
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insertedId = dataId = db.insert(TABLE.DATA, null, values); //数据库插入新行的id返回到两个变量中
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// Notify the note uri
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if (noteId > 0) {
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if (noteId > 0) { //不为零表示插入成功，
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getContext().getContentResolver().notifyChange(
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ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
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ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); //通知uri发生变化
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}
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// Notify the data uri
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@ -178,22 +178,22 @@ public class NotesProvider extends ContentProvider {
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ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
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}
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return ContentUris.withAppendedId(uri, insertedId);
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return ContentUris.withAppendedId(uri, insertedId); //返回新的uri，表示插入位置
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}
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@Override
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public int delete(Uri uri, String selection, String[] selectionArgs) {
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int count = 0;
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public int delete(Uri uri, String selection, String[] selectionArgs) { //表示要删除的uri、SQL中的WHERE与参数
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int count = 0; //表示删除记录数
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String id = null;
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SQLiteDatabase db = mHelper.getWritableDatabase();
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SQLiteDatabase db = mHelper.getWritableDatabase(); //打开数据库
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boolean deleteData = false;
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switch (mMatcher.match(uri)) {
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switch (mMatcher.match(uri)) { //uri匹配
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case URI_NOTE:
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
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count = db.delete(TABLE.NOTE, selection, selectionArgs);
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; //设置WHERE
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count = db.delete(TABLE.NOTE, selection, selectionArgs); //删除，并计数
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break;
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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id
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/**
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* ID that smaller than 0 is system folder which is not allowed to
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* trash
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@ -204,45 +204,45 @@ public class NotesProvider extends ContentProvider {
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}
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count = db.delete(TABLE.NOTE,
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NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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break;
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break; //删除指定id，并计数
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case URI_DATA:
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count = db.delete(TABLE.DATA, selection, selectionArgs);
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count = db.delete(TABLE.DATA, selection, selectionArgs); //删除，并计数
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deleteData = true;
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break;
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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id
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count = db.delete(TABLE.DATA,
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DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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deleteData = true;
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deleteData = true; //删除指定id，并计数
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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throw new IllegalArgumentException("Unknown URI " + uri); //报错
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}
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if (count > 0) {
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if (count > 0) { //表示有删除操作，通知uri发生变化
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if (deleteData) {
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}
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getContext().getContentResolver().notifyChange(uri, null);
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}
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return count;
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return count; //返回删除的记录数
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}
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@Override
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public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
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int count = 0;
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public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { //表示更新的uri、values为新的列值、where以及参数
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int count = 0; //更新条数
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String id = null;
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean updateData = false;
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switch (mMatcher.match(uri)) {
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SQLiteDatabase db = mHelper.getWritableDatabase(); //打开数据库
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boolean updateData = false; //设置数据表更新表示
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switch (mMatcher.match(uri)) { //匹配uri
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case URI_NOTE:
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increaseNoteVersion(-1, selection, selectionArgs);
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count = db.update(TABLE.NOTE, values, selection, selectionArgs);
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increaseNoteVersion(-1, selection, selectionArgs); //跟新便签
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count = db.update(TABLE.NOTE, values, selection, selectionArgs); //更新指定表的行，并计数
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break;
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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); //提取id
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increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
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count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs);
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+ parseSelection(selection), selectionArgs); //增加指定的id条件
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break;
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case URI_DATA:
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count = db.update(TABLE.DATA, values, selection, selectionArgs);
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@ -255,51 +255,50 @@ public class NotesProvider extends ContentProvider {
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updateData = true;
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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throw new IllegalArgumentException("Unknown URI " + uri); //抛出异常
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}
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if (count > 0) {
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if (updateData) {
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);//通知指定uri数据更改
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}
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getContext().getContentResolver().notifyChange(uri, null);
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getContext().getContentResolver().notifyChange(uri, null); //通知uri数据更改
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}
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return count;
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}
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private String parseSelection(String selection) {
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return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
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private String parseSelection(String selection) { //检查selection是否为空
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return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); //为空则返回“”
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}
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private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
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private void increaseNoteVersion(long id, String selection, String[] selectionArgs) { //使用数据库更新便签版本
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StringBuilder sql = new StringBuilder(120);
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sql.append("UPDATE ");
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sql.append(TABLE.NOTE);
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sql.append(" SET ");
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sql.append(NoteColumns.VERSION);
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sql.append("=" + NoteColumns.VERSION + "+1 ");
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sql.append("=" + NoteColumns.VERSION + "+1 "); //升级便签版本号
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if (id > 0 || !TextUtils.isEmpty(selection)) {
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if (id > 0 || !TextUtils.isEmpty(selection)) { //selection不为空或存在id则增加where条件
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sql.append(" WHERE ");
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}
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if (id > 0) {
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sql.append(NoteColumns.ID + "=" + String.valueOf(id));
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}
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if (!TextUtils.isEmpty(selection)) {
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String selectString = id > 0 ? parseSelection(selection) : selection;
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for (String args : selectionArgs) {
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selectString = selectString.replaceFirst("\\?", args);
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String selectString = id > 0 ? parseSelection(selection) : selection; //parseSelection将传入的参数中的占位符替换为实际的值
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for (String args : selectionArgs) { //
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selectString = selectString.replaceFirst("\\?", args); //replaceFirst选择参数数组中的值替换语句中的占位符
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}
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sql.append(selectString);
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}
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mHelper.getWritableDatabase().execSQL(sql.toString());
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mHelper.getWritableDatabase().execSQL(sql.toString()); //执行SQL语句
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}
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@Override
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public String getType(Uri uri) {
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// TODO Auto-generated method stub
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public String getType(Uri uri) { //获取指定uri的MIME类型
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// TODO Auto-generated method stub //表示该方法没有实现
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return null;
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}
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}
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lilium-saber
2 years ago