【android】ORMLite框架 的使用方法---给你的数据库操作插上翅膀
16lz
2022-05-19
一：首先下载 ORMLite Jar 包
先去 ORMLite官网下载jar包 写博客时，目前最新的，对于Android为：ormlite-android-5.0.jar 和 ormlite-core-5.0.jar ；
然后分包处理，建议如图所示分包：
二：配置Bean类
@DatabaseTable(tableName = "Book")public class MyBean { @DatabaseField(generatedId = true) private int id; @DatabaseField(columnName = "name") public String name; @DatabaseField(columnName = "author") public String author; @DatabaseField(columnName = "price") public String price; @DatabaseField(columnName = "pages") public int pages; public String getAuthor() { return author; } public void setAuthor(String author) { this.author = author; } public String getPrice() { return price; } public void setPrice(String price) { this.price = price; } public int getPages() { return pages; } public void setPages(int pages) { this.pages = pages; } public String getName() { return name; } public void setName(String name) { this.name = name; }}三：编写Helper类
public class MyDatabaseHelper extends OrmLiteSqliteOpenHelper { public static final String DB_NAME = "BookStore.db"; public static final int DB_VERSION = 1; public MyDatabaseHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); } @Override public void onCreate(SQLiteDatabase sqLiteDatabase, ConnectionSource connectionSource) { try { TableUtils.createTable(connectionSource, MyBean.class); } catch (SQLException e) { e.printStackTrace(); } } @Override public void onUpgrade(SQLiteDatabase sqLiteDatabase, ConnectionSource connectionSource, int oldVersion, int newVersion) { System.out.println("MyDatabaseHelper.onUpgrade oldVersion=" + oldVersion + " newVersion=" + newVersion); try { switch (oldVersion) { case 1: getDao(MyBean.class).executeRaw("alter table Book add column book_type varchar(20)"); //在数据库版本1的下一版本，Book表中新添加了 book_type 字段 case 2: // TableUtils.createTable(connectionSource, MyBean2.class); //在数据库版本2的下一版本，新增加了一张表 default: break; } //显然这样处理比较暴力 //TableUtils.dropTable(connectionSource, MyBean.class, true); //onCreate(sqLiteDatabase, connectionSource); } catch (SQLException e) { e.printStackTrace(); } } private static MyDatabaseHelper instance; /** * 单例获取该Helper * * @param context * @return */ public static MyDatabaseHelper getHelper(Context context) { if (instance == null) { synchronized (MyDatabaseHelper.class) { if (instance == null) instance = new MyDatabaseHelper(context); } } return instance; } private Map daos = new HashMap<>(); public synchronized Dao getDao(Class clazz) throws SQLException { Dao dao = null; String className = clazz.getSimpleName(); if (daos.containsKey(className)) { dao = daos.get(clazz); } if (dao == null) { dao = super.getDao(clazz); daos.put(className, dao); } return dao; } @Override public void close() { super.close(); for (String key : daos.keySet()) { Dao dao = daos.get(key); dao = null; } }} 四：编写DAO类
1：接口编写：
public interface MyDataImpl { void insert(ArrayList beanArrayList); void insert(MyBean myBean); void update(String name, String price); void update2(String columnName, String columnValue); void update3(String queryColumnName, String queryColumnValue, String setColumnName, String setColumnValue); void delete(String name); int deleteAll(); ArrayList<String> queryPrice(String name); String queryAuthor(String name, String price); long queryCount(); ArrayList queryId(int id); ArrayList queryAll();} public class MyDataDao implements MyDataImpl { private MyDatabaseHelper mHelper; private Dao dao; private Context mContext; private static MyDataDao instance; protected MyDataDao(Context context) { this.mContext = context; try { mHelper = MyDatabaseHelper.getHelper(mContext); dao = mHelper.getDao(MyBean.class); } catch (SQLException e) { e.printStackTrace(); } } public static MyDataDao getInstance(Context context) { if (instance == null) { synchronized (MyDataDao.class) { if (instance == null) { instance = new MyDataDao(context); } } } return instance; } @Override public void insert(MyBean myBean) { try { //事务操作 /* TransactionManager.callInTransaction(mHelper.getConnectionSource(), new Callable() { @Override public Void call() throws Exception { return null; } });*/ dao.create(myBean); //dao.createOrUpdate(myBean);//和上一行的方法效果一样 } catch (SQLException e) { e.printStackTrace(); } } @Override public void insert(ArrayList beanArrayList) { try { dao.create(beanArrayList); } catch (SQLException e) { e.printStackTrace(); } } @Override public void update(String name, String price) { ArrayList list = null; try { list = (ArrayList) dao.queryForEq("name", name); if (list != null) { for (MyBean bean : list) { bean.setPrice(price); dao.update(bean); //dao.createOrUpdate(bean);//和上一行的方法效果一样 } } } catch (SQLException e) { e.printStackTrace(); } } @Override public void update2(String columnName, String columnValue) { try { //下面这两个代码的意思一样 dao.updateBuilder().updateColumnValue(columnName, columnValue).update(); //dao.updateRaw("update Book set " + columnName + "=?", new String[]{columnValue}); } catch (SQLException e) { e.printStackTrace(); } } @Override public void update3(String queryColumnName, String queryColumnValue, String setColumnName, String setColumnValue) { try { String sql = "update Book set " + setColumnName + "= '" + setColumnValue + "' where " + queryColumnName + "= '" + queryColumnValue + "'"; System.out.println("MyDataDao.update3 sql=" + sql); dao.updateRaw(sql); //dao.updateRaw("update Book set price= '33333元' where name= '西游记'");//等价于上面的写法 } catch (SQLException e) { e.printStackTrace(); } } @Override public void delete(String name) { ArrayList list = null; try { list = (ArrayList) dao.queryForEq("name", name); if (list != null) { for (MyBean bean : list) { dao.delete(bean); } } } catch (SQLException e) { e.printStackTrace(); } } /** * @return -1:删除数据异常 0：无数据 */ @Override public int deleteAll() { int number = -1; try { number = dao.deleteBuilder().delete();//返回删除的数据条数 例如：删除1条数据，返回1，依次类推。 //dao.deleteBuilder().where().eq("name", "记").reset();//???? } catch (SQLException e) { e.printStackTrace(); } return number; } @Override public ArrayList queryPrice(String name) { List list = null; ArrayList strings = null; try { list = dao.queryForEq("name", name); if (list != null) { strings = new ArrayList<>(); for (MyBean myBean : list) { strings.add(myBean.getPrice()); } /*for (int i = 0; i < list.size(); i++) { strings.add(list.get(i).getPrice()); }*/ } } catch (SQLException e) { e.printStackTrace(); } return strings; } @Override public String queryAuthor(String name1, String price1) { List list = null; String author = ""; try { list = dao.queryBuilder().where().eq("name", name1).and().eq("price", price1).query();//上述相当与：select * from Book where name = name1 and price = price1 ; if (list != null) { for (MyBean myBean : list) { author = myBean.getAuthor(); } } } catch (SQLException e) { e.printStackTrace(); } return author;//说明：如果这个 author 是唯一的，可以这样的返回。如果是多个的话，要返回一个ArrayList 类型 } /** * @return 表中数据的个数 */ @Override public long queryCount() { long number = 0; try { number = dao.queryBuilder().countOf(); } catch (SQLException e) { e.printStackTrace(); } return number; } /** * @param id 这个id 就是表中，每次插入数据，自己递增的id 字段 */ @Override public ArrayList queryId(int id) { ArrayList list = null; try { MyBean myBean = dao.queryForId(id); if (myBean != null) { list = new ArrayList<>(); list.add(myBean); } return list; } catch (SQLException e) { e.printStackTrace(); } return list; } @Override public ArrayList queryAll() { ArrayList list = null; try { list = (ArrayList) dao.queryForAll(); if (list != null) { return list; } } catch (SQLException e) { e.printStackTrace(); } return list; } public boolean delteTables(Context context, String DBname) { //????? return false; } /** * 这个方法可以的 */ public boolean delteDatabases(Context context, String DBname) { return context.deleteDatabase(DBname); }} 五：测试
源码下载地址
参考文章：
Android快速开发–使用ORMLite操作数据库
鸿洋的博客：
Android ORMLite 框架的入门用法
Android 快速开发系列 ORMLite 框架最佳实践
SQL 语法
SQL UPDATE 语句
OrmLite 官网
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