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@ -26,23 +26,29 @@ import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.DataConstants;
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import net.micode.notes.data.Notes.NoteColumns;
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//管理 SQLite 数据库的创建、升级和访问
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//类定义：NotesDatabaseHelper
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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//数据库名称和版本
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private static final String DB_NAME = "note.db";
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private static final int DB_VERSION = 4;
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//表名接口
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public interface TABLE {
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public static final String NOTE = "note";
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public static final String DATA = "data";
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}
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//日志标签
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private static final String TAG = "NotesDatabaseHelper";
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//单例实例
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private static NotesDatabaseHelper mInstance;
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private static final String CREATE_NOTE_TABLE_SQL = "CREATE TABLE " + TABLE.NOTE + "(" +
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//创建 note 表
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private static final String CREATE_NOTE_TABLE_SQL =
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"CREATE TABLE " + TABLE.NOTE + "(" +
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NoteColumns.ID + " INTEGER PRIMARY KEY," +
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
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@ -60,9 +66,11 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
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")";
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")";
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private static final String CREATE_DATA_TABLE_SQL = "CREATE TABLE " + TABLE.DATA + "(" +
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//创建 data 表
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private static final String CREATE_DATA_TABLE_SQL =
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"CREATE TABLE " + TABLE.DATA + "(" +
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DataColumns.ID + " INTEGER PRIMARY KEY," +
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DataColumns.MIME_TYPE + " TEXT NOT NULL," +
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
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@ -74,132 +82,147 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
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")";
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")";
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private static final String CREATE_DATA_NOTE_ID_INDEX_SQL = "CREATE INDEX IF NOT EXISTS note_id_index ON " +
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TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
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//创建索引
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private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
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"CREATE INDEX IF NOT EXISTS note_id_index ON " +
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TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
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//触发器（Triggers）笔记移动/插入时更新文件夹计数
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/**
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* Increase folder's note count when move note to the folder
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*/
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = "CREATE TRIGGER increase_folder_count_on_update "
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+
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
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" END";
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_update "
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+
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
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" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
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" AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
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" END";
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
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"CREATE TRIGGER increase_folder_count_on_update "+
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
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" END";
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/**
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* Decrease folder's note count when move note from folder
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*/
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
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"CREATE TRIGGER decrease_folder_count_on_update " +
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
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" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
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" AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
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" END";
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/**
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* Increase folder's note count when insert new note to the folder
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*/
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER = "CREATE TRIGGER increase_folder_count_on_insert "
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+
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" AFTER INSERT ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
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" END";
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
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"CREATE TRIGGER increase_folder_count_on_insert " +
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" AFTER INSERT ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
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" END";
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/**
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* Decrease folder's note count when delete note from the folder
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*/
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_delete "
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+
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
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" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
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" AND " + NoteColumns.NOTES_COUNT + ">0;" +
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" END";
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
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"CREATE TRIGGER decrease_folder_count_on_delete " +
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
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" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
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" AND " + NoteColumns.NOTES_COUNT + ">0;" +
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" END";
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//数据变化时同步更新笔记摘要
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/**
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* Update note's content when insert data with type {@link DataConstants#NOTE}
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*/
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER = "CREATE TRIGGER update_note_content_on_insert "
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+
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" AFTER INSERT ON " + TABLE.DATA +
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" WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
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" END";
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
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"CREATE TRIGGER update_note_content_on_insert " +
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" AFTER INSERT ON " + TABLE.DATA +
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" WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
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" END";
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/**
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* Update note's content when data with {@link DataConstants#NOTE} type has
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* changed
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* Update note's content when data with {@link DataConstants#NOTE} type has changed
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*/
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER = "CREATE TRIGGER update_note_content_on_update "
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+
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" AFTER UPDATE ON " + TABLE.DATA +
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
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" END";
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
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"CREATE TRIGGER update_note_content_on_update " +
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" AFTER UPDATE ON " + TABLE.DATA +
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
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" END";
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/**
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* Update note's content when data with {@link DataConstants#NOTE} type has
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* deleted
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* Update note's content when data with {@link DataConstants#NOTE} type has deleted
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*/
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
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"CREATE TRIGGER update_note_content_on_delete " +
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" AFTER delete ON " + TABLE.DATA +
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=''" +
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" WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
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" END";
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//删除级联操作
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/**
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* Delete datas belong to note which has been deleted
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*/
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private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
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"CREATE TRIGGER delete_data_on_delete " +
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN" +
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" DELETE FROM " + TABLE.DATA +
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" WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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//移动文件夹内笔记到回收站
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/**
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* Delete notes belong to folder which has been deleted
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*/
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER = "CREATE TRIGGER update_note_content_on_delete "
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+
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" AFTER delete ON " + TABLE.DATA +
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=''" +
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" WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
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" END";
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// 数据库触发，当删除一条笔记时，自动删除与该笔记相关的所有数据（DATA 表中的记录）
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private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER = "CREATE TRIGGER delete_data_on_delete " +
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN" +
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" DELETE FROM " + TABLE.DATA +
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" WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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// 当删除一个文件夹时，自动删除该文件夹下的所有笔记
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private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER = "CREATE TRIGGER folder_delete_notes_on_delete "
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+
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN" +
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" DELETE FROM " + TABLE.NOTE +
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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// 当一个文件夹被移动到回收站时，自动将其子笔记也移动到回收站
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private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER = "CREATE TRIGGER folder_move_notes_on_trash " +
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" AFTER UPDATE ON " + TABLE.NOTE +
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" WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
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"CREATE TRIGGER folder_delete_notes_on_delete " +
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN" +
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" DELETE FROM " + TABLE.NOTE +
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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/**
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* Move notes belong to folder which has been moved to trash folder
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*/
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private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
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"CREATE TRIGGER folder_move_notes_on_trash " +
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" AFTER UPDATE ON " + TABLE.NOTE +
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" WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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//构造函数
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public NotesDatabaseHelper(Context context) {
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super(context, DB_NAME, null, DB_VERSION);
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}
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// 创建笔记表（NOTE 表），并初始化相关触发器。
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// 创建系统文件夹（如回收站、临时文件夹等）。
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//数据库创建方法
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public void createNoteTable(SQLiteDatabase db) {
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db.execSQL(CREATE_NOTE_TABLE_SQL);
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reCreateNoteTableTriggers(db);
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@ -207,6 +230,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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Log.d(TAG, "note table has been created");
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}
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//重建触发器方法
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
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@ -225,6 +249,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
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}
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//创建系统文件夹
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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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@ -277,7 +302,6 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
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}
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// 数据库实例管理
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static synchronized NotesDatabaseHelper getInstance(Context context) {
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if (mInstance == null) {
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mInstance = new NotesDatabaseHelper(context);
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@ -285,16 +309,13 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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return mInstance;
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}
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// 数据库创建与升级，在数据库首次创建时，调用 createNoteTable 和 createDataTable 方法，创建笔记表和数据表。
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//生命周期方法
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@Override
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public void onCreate(SQLiteDatabase db) {
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createNoteTable(db);
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createDataTable(db);
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}
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// 处理数据库版本升级。
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// 根据旧版本和新版本之间的差异，依次调用 upgradeToV2、upgradeToV3 和 upgradeToV4 方法。
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// 如果需要重新创建触发器，则调用 reCreateNoteTableTriggers 和 reCreateDataTableTriggers。
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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boolean reCreateTriggers = false;
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@ -328,33 +349,31 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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}
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}
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// 在升级到版本 2 时，删除旧表并重新创建笔记表和数据表
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private void upgradeToV2(SQLiteDatabase db) {
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// 如果存在旧的 note 表和 data 表，则先删除（用于重新创建）
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|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
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db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
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|
// 重新创建 note 表（包含新字段和约束）
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|
|
createNoteTable(db);
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|
// 创建 data 表（存储笔记内容等详细信息
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|
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createDataTable(db);
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|
}
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// 删除无用的触发器。
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|
// 在笔记表中新增 GTASK_ID 列，用于支持 Google
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|
// Tasks 功能。添加回收站文件夹。
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|
|
private void upgradeToV3(SQLiteDatabase db) {
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|
|
// drop unused triggers
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|
|
// 删除不再使用的触发器（v2 中可能存在的旧触发器）
|
|
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|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
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|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
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|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
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|
|
// add a column for gtask id
|
|
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|
|
// 添加一个用于同步 Google Tasks 的字段 gtask_id
|
|
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|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
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|
|
+ " TEXT NOT NULL DEFAULT ''");
|
|
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|
|
// add a trash system folder
|
|
|
|
|
// 插入一个新的系统文件夹：回收站（Trash Folder）
|
|
|
|
|
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);
|
|
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|
|
}
|
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|
// 在笔记表中新增 VERSION 列，用于版本控制。
|
|
|
|
|
private void upgradeToV4(SQLiteDatabase db) {
|
|
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
|
|
|
|
+ " INTEGER NOT NULL DEFAULT 0");
|
|
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|
|
|
