Android database operation tool class

HistoryDAO

public class HistoryDAO {
    private DBConnection dbc = null;
    private SQLiteDatabase db = null;
    private Context context;

    //数据库上下文
    public HistoryDAO(Context context) {
        this.context = context;
    }
    //打开数据库
    public HistoryDAO open() {
        dbc = new DBConnection(context);
        db = dbc.getWritableDatabase();
        return this;
    }

    //关闭数据库
    public void closeAll() {
        db.close();
        dbc.close();
    }

//    // 增加
//    public void add(Search_HistoryData data, String type) {
//        open();
//        ContentValues values = new ContentValues();
//        values.put("content", data.getContent());
//        values.put("type", data.getType());
//        db.insert("history", null, values);
//        closeAll();
//    }

    // 增加
    public void add(Search_HistoryData data, String tableName) {
        open();
        ContentValues values = new ContentValues();
        values.put("content", data.getContent());
        db.insert(tableName, null, values);
        closeAll();
    }

    // 增加 工具类的最后五个专用
    public void addLawTool(Search_HistoryData data, String tableName) {
        open();
        ContentValues values = new ContentValues();
        values.put("content", data.getContent());
        values.put("_id", data.getId());
        db.insert(tableName, null, values);
        closeAll();
    }

    // 全查询
    public List getAll(String TableName) {
        open();
        List ar = new ArrayList();
        Cursor c = db.rawQuery("select * from " + TableName, null);
        while (c.moveToNext()) {
            Map map = new HashMap();
            map.put("_id", c.getInt(c.getColumnIndex("_id")));
            map.put("content", c.getString(c.getColumnIndex("content")));
            ar.add(map);
        }
        closeAll();
        return ar;
    }

    // 删除 根据id删除
    public void delete(String tableName, int uid) {
        open();
        db.delete("history", "uid=" + uid, null);
        closeAll();
    }

    //清空表中所有数据
    public void delete(String tableName) {
        open();
        db.delete(tableName, null, null);
        closeAll();
    }

    //判断是否存在
    public boolean searchResult(String tableName, String key) {
        open();
        Boolean booleans =
                db.rawQuery("select * from " + tableName + " where content = ?", new String[]{key}).moveToNext();
        closeAll();
        return booleans;
    }

    //根据库查询表字段
    public boolean searchResultToType(String content, String type) {
        open();
        Boolean booleans =
                db.rawQuery("select * from history where content = ? and type = ?", new String[]{content, type}).moveToNext();
        closeAll();
        return booleans;
    }

}

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