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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"; // 笔记表的名称
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public static final String DATA = "data"; // 数据表的名称
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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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// 创建笔记表的SQL语句
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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," + // 笔记ID，主键
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 父级ID
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + // 提醒日期
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景颜色ID
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期
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NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + // 是否有附件
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期
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NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + // 笔记计数
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 笔记摘要
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 笔记类型
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + // 小部件ID
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + // 小部件类型
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + // 同步ID
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + // 本地修改标志
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 原始父级ID
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + // Google任务ID
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + // 版本号
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")";
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// 创建数据表的SQL语句
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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," + // 数据ID，主键
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DataColumns.MIME_TYPE + " TEXT NOT NULL," + // MIME类型
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 关联的笔记ID
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," + // 内容
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DataColumns.DATA1 + " INTEGER," + // 数据字段1
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DataColumns.DATA2 + " INTEGER," + // 数据字段2
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 数据字段3
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 数据字段4
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 数据字段5
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")";
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// 创建数据表的NOTE_ID索引SQL语句
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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 + ");"; // 为NOTE_ID创建索引
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/**
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* 在将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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" 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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* 当笔记从文件夹中移动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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" 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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* 在向文件夹中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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" 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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* 从文件夹中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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" 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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* 在插入类型为 {@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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" 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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* 当类型为 {@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 + // 当数据表中有数据被删除后触发
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + // 仅当删除的数据类型为NOTE时触发
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" BEGIN" +
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" UPDATE " + TABLE.NOTE + // 更新笔记表
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" SET " + NoteColumns.SNIPPET + "=''" + // 将笔记摘要设置为空
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" WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + // 根据被删除数据的NOTE_ID查找对应笔记
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" END";
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/**
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* 删除与已删除笔记关联的数据
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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 + // 当笔记表中的数据被删除后触发
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" BEGIN" +
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" DELETE FROM " + TABLE.DATA + // 从数据表中删除关联的数据
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" WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + // 根据已删除笔记的ID进行删除
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" END";
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/**
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* 删除与已删除文件夹关联的笔记
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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 + // 当笔记表中的数据被删除后触发
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" BEGIN" +
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" DELETE FROM " + TABLE.NOTE + // 从笔记表中删除关联的笔记
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + // 根据已删除文件夹的ID进行删除
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" END";
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/**
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* 将属于已移至垃圾箱文件夹的笔记移动到垃圾箱
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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 + // 当笔记表中的数据更新后触发
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" WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + // 当新父级ID为垃圾箱ID时触发
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" BEGIN" +
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" UPDATE " + TABLE.NOTE + // 更新笔记表
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" SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + // 将父级ID设置为垃圾箱ID
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + // 更新与已移除的文件夹ID相关的笔记
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" END";
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// NotesDatabaseHelper构造函数，初始化数据库帮助器
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public NotesDatabaseHelper(Context context) {
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super(context, DB_NAME, null, DB_VERSION); // 调用父类构造函数，设置数据库名称和版本
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}
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// 创建笔记表的方法
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public void createNoteTable(SQLiteDatabase db) {
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db.execSQL(CREATE_NOTE_TABLE_SQL); // 执行创建笔记表的SQL语句
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reCreateNoteTableTriggers(db); // 重新创建与笔记表相关的触发器
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createSystemFolder(db); // 创建系统文件夹
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Log.d(TAG, "note table has been created"); // 打印日志，指示笔记表已创建
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}
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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// 删除已存在的触发器，防止重复创建
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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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// 创建新的触发器
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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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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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/**
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* call record folder for call notes
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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); // 插入通话记录文件夹
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/**
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* root folder which is default folder
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*/
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values.clear(); // 清空之前的内容
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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); // 插入根文件夹
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/**
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* temporary folder which is used for moving note
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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); // 插入临时文件夹
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/**
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* create trash folder
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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); // 插入垃圾箱文件夹
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}
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public void createDataTable(SQLiteDatabase db) {
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db.execSQL(CREATE_DATA_TABLE_SQL); // 执行创建数据表的SQL语句
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reCreateDataTableTriggers(db); // 重新创建与数据表相关的触发器
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db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建数据表中NOTE_ID的索引
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Log.d(TAG, "data table has been created"); // 打印日志，指示数据表已创建
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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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// 创建新的触发器
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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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static synchronized NotesDatabaseHelper getInstance(Context context) {
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if (mInstance == null) {
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mInstance = new NotesDatabaseHelper(context); // 如果实例不存在，则创建新实例
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}
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return mInstance; // 返回单例实例
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}
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@Override
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public void onCreate(SQLiteDatabase db) {
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createNoteTable(db); // 创建笔记表
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createDataTable(db); // 创建数据表
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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; // 标记是否需要重新创建触发器
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boolean skipV2 = false; // 标记是否跳过v2升级
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if (oldVersion == 1) {
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upgradeToV2(db); // 升级到版本2
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skipV2 = true; // 设置为跳过v2的标记
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oldVersion++;
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}
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if (oldVersion == 2 && !skipV2) {
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upgradeToV3(db); // 升级到版本3
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reCreateTriggers = true; // 设置为需要重新创建触发器
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oldVersion++;
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}
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if (oldVersion == 3) {
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upgradeToV4(db); // 升级到版本4
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oldVersion++;
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}
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if (reCreateTriggers) {
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reCreateNoteTableTriggers(db); // 重新创建与笔记表相关的触发器
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reCreateDataTableTriggers(db); // 重新创建与数据表相关的触发器
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}
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// 如果旧版本不等于新版本，抛出异常
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if (oldVersion != newVersion) {
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throw new IllegalStateException("Upgrade notes database to version " + newVersion + " fails");
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}
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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); // 删除笔记表
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db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); // 删除数据表
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createNoteTable(db); // 重新创建笔记表
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createDataTable(db); // 重新创建数据表
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}
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private void upgradeToV3(SQLiteDatabase db) {
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// drop unused triggers
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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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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''");
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// add a trash system folder
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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); // 插入垃圾箱文件夹
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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 + " INTEGER NOT NULL DEFAULT 0");
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}
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