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王希宁 2023317170
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package net.micode.notes.data;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.util.Log;
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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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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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private static final String DB_NAME = "note.db"; // 数据库名称
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private static final int DB_VERSION = 4; // 数据库版本号
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public interface TABLE {
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public static final String NOTE = "note"; // 笔记表名称
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public static final String DATA = "data"; // 数据表名称
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}
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private static final String TAG = "NotesDatabaseHelper"; // 日志标签
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private static NotesDatabaseHelper mInstance; // 单例实例
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private static final String CREATE_NOTE_TABLE_SQL = // 创建笔记表的SQL语句
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"CREATE TABLE " + TABLE.NOTE + "(" +
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NoteColumns.ID + " INTEGER PRIMARY KEY," +
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// ... 省略其他字段
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
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")";
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private static final String CREATE_DATA_TABLE_SQL = // 创建数据表的SQL语句
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"CREATE TABLE " + TABLE.DATA + "(" +
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DataColumns.ID + " INTEGER PRIMARY KEY," +
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// ... 省略其他字段
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
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")";
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private static final String CREATE_DATA_NOTE_ID_INDEX_SQL = // 创建数据表的索引SQL语句
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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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/**
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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 = // 创建触发器的SQL语句
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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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* 其他代码...
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*/
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}
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```
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这里对数据库帮助类的各个部分进行了注释说明，包括数据库名称、版本号、表名称、创建表的SQL语句等。希望这样的注释能够帮助你更好地理解和使用这段代码。
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```java
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/**
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* 当将笔记从文件夹中移出时，减少文件夹中的笔记数量
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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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* 将新笔记插入到文件夹中时，增加文件夹中的笔记数量
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*/
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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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* 当从文件夹中删除笔记时，减少文件夹中的笔记数量
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*/
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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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/**
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* 当插入类型为{@link DataConstants#NOTE}的数据时，更新笔记内容
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*/
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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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* 当类型为{@link DataConstants#NOTE}的数据发生更改时，更新
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```java
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/**
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* 当数据类型为{@link DataConstants#NOTE}的数据被删除时，更新笔记内容
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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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/**
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* 删除已删除笔记所属的数据
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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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/**
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* 删除已删除文件夹所属的笔记
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*/
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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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* 将已移至回收站文件夹的文件夹中的笔记移至回收站
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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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public NotesDatabaseHelper(Context context) {
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super(context, DB_NAME, null, DB_VERSION);
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}
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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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createSystemFolder(db);
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Log.d(TAG, "note table has been created");
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}
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```
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```java
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/**
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* 重新创建笔记表的触发器
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* @param db SQLiteDatabase对象
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*/
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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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db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
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db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
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db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
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}
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/**
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* 创建系统文件夹
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* @param db SQLiteDatabase对象
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*/
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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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/**
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* 通话记录文件夹
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*/
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values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);
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/**
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* 根文件夹，即默认文件夹
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*/
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values.clear();
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values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);
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/**
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* 临时文件夹，用于移动笔记
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*/
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values.clear();
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values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);
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/**
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* 创建回收站文件夹
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*/
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values.clear();
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);
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}
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/**
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* 创建数据表
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* @param db SQLiteDatabase对象
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*/
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public void createDataTable(SQLiteDatabase db) {
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db.execSQL(CREATE_DATA_TABLE_SQL);
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reCreateDataTableTriggers(db);
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db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
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Log.d(TAG, "数据表已创建");
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}
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/**
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* 重新创建数据表的触发器
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* @param db SQLiteDatabase对象
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*/
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private void reCreateDataTableTriggers(SQLiteDatabase db) {
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
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}
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/**
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* 获取NotesDatabaseHelper的实例
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* @param context 上下文对象
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* @return NotesDatabaseHelper的实例
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*/
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static synchronized NotesDatabaseHelper getInstance(Context
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```java
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/**
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* 数据库升级方法
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* @param db SQLiteDatabase对象
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* @param oldVersion 旧版本号
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* @param newVersion 新版本号
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*/
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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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boolean skipV2 = false;
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if (oldVersion == 1) {
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upgradeToV2(db);
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skipV2 = true; // 此升级包括从v2到v3的升级
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oldVersion++;
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}
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if (oldVersion == 2 && !skipV2) {
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upgradeToV3(db);
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reCreateTriggers = true;
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oldVersion++;
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}
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if (oldVersion == 3) {
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upgradeToV4(db);
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oldVersion++;
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}
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if (reCreateTriggers) {
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reCreateNoteTableTriggers(db);
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reCreateDataTableTriggers(db);
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}
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if (oldVersion != newVersion) {
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throw new IllegalStateException("升级笔记数据库到版本 " + newVersion
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+ " 失败");
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}
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}
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/**
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* 升级到版本2的方法
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* @param db SQLiteDatabase对象
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*/
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private void upgradeToV2(SQLiteDatabase db) {
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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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createNoteTable(db);
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createDataTable(db);
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}
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/**
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* 升级到版本3的方法
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* @param db SQLiteDatabase对象
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*/
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private void upgradeToV3(SQLiteDatabase db) {
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// 删除未使用的触发器
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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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// 添加一个用于gtask id的列
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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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// 添加一个垃圾箱系统文件夹
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ContentValues values = new ContentValues();
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);
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}
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/**
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* 升级到版本4的方法
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* @param db SQLiteDatabase对象
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*/
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private void upgradeToV4(SQLiteDatabase db) {
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
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+ " INTEGER NOT NULL DEFAULT 0");
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}
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```
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