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@ -26,20 +26,31 @@ 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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/**
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* 笔记数据库帮助类
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* 负责创建和管理SQLite数据库，包括笔记表和数据表
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*/
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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/** 数据库名称 */
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private static final String DB_NAME = "note.db";
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/** 数据库版本号 */
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private static final int DB_VERSION = 4;
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/**
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* 数据库表名接口
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*/
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public interface TABLE {
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/** 笔记表名 */
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public static final String NOTE = "note";
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/** 数据表名 */
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public static final String DATA = "data";
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}
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private static final String TAG = "NotesDatabaseHelper";
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/** 数据库帮助类的单例实例 */
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private static NotesDatabaseHelper mInstance;
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private static final String CREATE_NOTE_TABLE_SQL =
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@ -83,7 +94,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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* 触发器：当笔记移动到文件夹时，增加文件夹的笔记计数
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*/
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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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@ -95,7 +106,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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* 触发器：当笔记从文件夹移出时，减少文件夹的笔记计数
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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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@ -108,7 +119,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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* 触发器：当向文件夹插入新笔记时，增加文件夹的笔记计数
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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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@ -120,7 +131,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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* 触发器：当从文件夹删除笔记时，减少文件夹的笔记计数
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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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@ -133,7 +144,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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/**
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* Update note's content when insert data with type {@link DataConstants#NOTE}
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* 触发器：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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@ -146,7 +157,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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 changed
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* 触发器：当类型为{@link DataConstants#NOTE}的数据更新时，更新笔记内容
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*/
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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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@ -159,7 +170,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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 deleted
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* 触发器：当类型为{@link DataConstants#NOTE}的数据删除时，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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@ -172,7 +183,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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/**
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* Delete datas belong to note which has been deleted
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* 触发器：当笔记被删除时，删除属于该笔记的所有数据
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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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@ -183,7 +194,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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/**
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* Delete notes belong to folder which has been deleted
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* 触发器：当文件夹被删除时，删除属于该文件夹的所有笔记
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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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@ -194,7 +205,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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* 触发器：当文件夹被移动到回收站时，将其中的笔记也移动到回收站
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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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@ -206,10 +217,18 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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/**
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* 构造函数
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* @param context 上下文对象
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*/
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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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/**
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* 创建笔记表
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* @param db 数据库对象
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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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@ -217,6 +236,10 @@ 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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/**
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* 重新创建笔记表的触发器
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* @param db 数据库对象
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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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@ -235,18 +258,22 @@ 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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/**
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* 创建系统文件夹
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* @param db 数据库对象
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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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* call record foler for call notes
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* 创建通话记录文件夹
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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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* root folder which is default folder
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* 创建根文件夹（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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@ -254,7 +281,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.insert(TABLE.NOTE, null, values);
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/**
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* temporary folder which is used for moving note
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* 创建临时文件夹（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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@ -262,7 +289,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.insert(TABLE.NOTE, null, values);
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/**
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* create trash folder
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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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@ -270,6 +297,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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 数据库对象
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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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@ -277,6 +308,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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Log.d(TAG, "data table has been created");
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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 数据库对象
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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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@ -287,6 +322,11 @@ 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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/**
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* 获取数据库帮助类的单例实例
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* @param context 上下文对象
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* @return 数据库帮助类实例
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*/
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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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@ -294,12 +334,18 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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return mInstance;
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}
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/**
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* 创建数据库
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*/
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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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/**
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* 升级数据库
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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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@ -333,6 +379,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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}
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}
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/**
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* 升级数据库到版本2
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* @param db 数据库对象
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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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@ -340,21 +390,29 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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createDataTable(db);
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}
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/**
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* 升级数据库到版本3
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* @param db 数据库对象
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*/
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private void upgradeToV3(SQLiteDatabase db) {
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// drop unused triggers
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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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// add a column for gtask id
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// 添加gtask_id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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// add a trash system folder
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// 添加回收站系统文件夹
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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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* 升级数据库到版本4
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* @param db 数据库对象
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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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