android ormlite框架,ORMLite框架的使用方法—给你的数据库操作插上翅膀

痛定思痛。 2022-10-18 00:58 317阅读 0赞

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：

![11ce4763dcbfeac68a03bbc599f73b38.png][]

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 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：

[11ce4763dcbfeac68a03bbc599f73b38.png]: /images/20221014/e3f71829e0a748bd972e612133e8e58a.png

android ormlite框架,ORMLite框架的使用方法—给你的数据库操作插上翅膀

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