Delete 'DBHelper.java'

DBHelper.java

@@ -1,111 +0,0 @@
-package com.example.sparrownotes.util;
-
-import android.content.Context;
-import android.database.sqlite.SQLiteDatabase;
-import android.util.ArrayMap;
-
-import com.example.sparrownotes.bean.NoteBean;
-import com.example.sparrownotes.bean.UserBean;
-import com.example.sparrownotes.util.Constant;
-import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;
-import com.j256.ormlite.dao.Dao;
-import com.j256.ormlite.support.ConnectionSource;
-import com.j256.ormlite.table.TableUtils;
-
-import java.sql.SQLException;
-
-/**
- * 数据库帮助类
- *
- * @author Horsen
- */
-@SuppressWarnings("AlibabaRemoveCommentedCode")
-public class DBHelper extends OrmLiteSqliteOpenHelper {
-    /**
-     * 防止多线程同时操作, 实现单例模式, 并锁定线程
-     * 数组存储App中所有的Dao对象的Map集合
-     */
-    private static DBHelper dbHelper = null;
-    private ArrayMap<String, Dao> daos = new ArrayMap<>();
-
-    public static synchronized DBHelper getInstance(Context context) {
-        if (dbHelper == null) {
-            synchronized (DBHelper.class) {
-                if (dbHelper == null) {
-                    dbHelper = new DBHelper(context);
-                }
-            }
-        }
-        return dbHelper;
-    }
-
-    private DBHelper(Context context) {
-        super(context, Constant.DB_NAME, null, Constant.DB_VERSION);
-    }
-
-    /**
-     * 包含创建表的语句
-     *
-     * @param sqLiteDatabase
-     * @param connectionSource
-     */
-    @Override
-    public void onCreate(SQLiteDatabase sqLiteDatabase, ConnectionSource connectionSource) {
-        try {
-            TableUtils.createTable(connectionSource, UserBean.class);
-            TableUtils.createTable(connectionSource, NoteBean.class);
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-
-    }
-
-    /**
-     * 包含新建表的语句
-     * 就是删了再创罢了
-     *
-     * @param sqLiteDatabase
-     * @param connectionSource
-     * @param i
-     * @param i1
-     */
-    @Override
-    public void onUpgrade(SQLiteDatabase sqLiteDatabase, ConnectionSource connectionSource, int i, int i1) {
-        try {
-            TableUtils.dropTable(connectionSource, UserBean.class, false);
-            TableUtils.dropTable(connectionSource, NoteBean.class, false);
-            onCreate(sqLiteDatabase, connectionSource);
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    /**
-     * 根据传入的Dao路径获取这个Dao的单例对象, 要么从daos中获取, 要么新建一个存入daos
-     */
-    @Override
-    public synchronized Dao getDao(Class clazz) throws SQLException {
-        Dao dao = null;
-        String className = clazz.getSimpleName();
-        if (daos.containsKey(className)) {
-            dao = daos.get(className);
-        }
-        if (dao == null) {
-            dao = super.getDao(clazz);
-            daos.put(className, dao);
-        }
-        return dao;
-    }
-
-    /**
-     * 释放资源
-     */
-    @Override
-    public void close() {
-        super.close();
-        for (String key : daos.keySet()) {
-            Dao dao = daos.get(key);
-            dao = null;
-        }
-    }
-}