Android中OrmLite数据库的使用
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换了一个项目后，需要把大量数据保存到本地，所以在选用数据库上有了小小的纠结，比较了SQLite，GreenDao，OrmLite后决定使用一个轻量级的数据库，说实话之前数据库这边用到的并不多，也就是存个登陆密码用户名什么的，用Shareprefrence就足够了。在网上看了一些资料后，决定用OrmLite这个数据库。如果对SQL的语言不熟悉的话，使用OrmLite这个库是很合适的。
使用起来也很方便，下面讲解一下ormlite在android studio中的使用
1）在工程中导入jar包
如图：就是红线标起来的这两个，没有的话，可以在网上搜，本章下面会给出源代码，源码里也有。
2）然后在你的项目的build.gradle里引用这两个jar包
compile files('libs/ormlite-android-4.48.jar') compile files('libs/ormlite-core-4.48.jar')3）下面我们就可以使用这个Ormlite数据库了，这里以Book创建数据库，（书名，价格，作者，类别.......）,首先来看这个实体类
package printertestdemo.test.com.textormlite;import com.j256.ormlite.field.DatabaseField;import com.j256.ormlite.table.DatabaseTable;/** * Created by admin on 2017/4/11. */@DatabaseTable(tableName = "BookEntity")public class BookEntity { @DatabaseField(generatedId = true)//generatedId 表示id为主键且自动生成 private int id; @DatabaseField(columnName = "ProductCodeLevel1") private String ProductCodeLevel1; @DatabaseField(columnName = "ProductNameLevel1") private String ProductNameLevel1; @DatabaseField(columnName = "ProductCodeLevel2") private String ProductCodeLevel2; @DatabaseField(columnName = "ProductNameLevel2") private String ProductNameLevel2; @DatabaseField(columnName = "ProductCodeLevel3") private String ProductCodeLevel3; @DatabaseField(columnName = "ProductNameLevel3") private String ProductNameLevel3; @DatabaseField(columnName = "ProductCodeLevel4") private String ProductCodeLevel4; @DatabaseField(columnName = "ProductName") private String ProductName; @DatabaseField(columnName = "LeftCount") private String LeftCount; @DatabaseField(columnName = "Price") private String Price; @DatabaseField(columnName = "Agio") private String Agio; @DatabaseField(columnName = "Score") private String Score; @DatabaseField(columnName = "Intrudoction") private String Intrudoction; public BookEntity() { } public BookEntity( String productCodeLevel1, String productNameLevel1, String productCodeLevel2, String productNameLevel2, String productCodeLevel3, String productNameLevel3, String productCodeLevel4, String productName, String leftCount, String price, String agio, String score, String intrudoction) { ProductCodeLevel1 = productCodeLevel1; ProductNameLevel1 = productNameLevel1; ProductCodeLevel2 = productCodeLevel2; ProductNameLevel2 = productNameLevel2; ProductCodeLevel3 = productCodeLevel3; ProductNameLevel3 = productNameLevel3; ProductCodeLevel4 = productCodeLevel4; ProductName = productName; LeftCount = leftCount; Price = price; Agio = agio; Score = score; Intrudoction = intrudoction; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getProductCodeLevel1() { return ProductCodeLevel1; } public void setProductCodeLevel1(String productCodeLevel1) { ProductCodeLevel1 = productCodeLevel1; } public String getProductNameLevel1() { return ProductNameLevel1; } public void setProductNameLevel1(String productNameLevel1) { ProductNameLevel1 = productNameLevel1; } public String getProductCodeLevel2() { return ProductCodeLevel2; } public void setProductCodeLevel2(String productCodeLevel2) { ProductCodeLevel2 = productCodeLevel2; } public String getProductNameLevel2() { return ProductNameLevel2; } public void setProductNameLevel2(String productNameLevel2) { ProductNameLevel2 = productNameLevel2; } public String getProductCodeLevel3() { return ProductCodeLevel3; } public void setProductCodeLevel3(String productCodeLevel3) { ProductCodeLevel3 = productCodeLevel3; } public String getProductNameLevel3() { return ProductNameLevel3; } public void setProductNameLevel3(String productNameLevel3) { ProductNameLevel3 = productNameLevel3; } public String getProductCodeLevel4() { return ProductCodeLevel4; } public void setProductCodeLevel4(String productCodeLevel4) { ProductCodeLevel4 = productCodeLevel4; } public String getProductName() { return ProductName; } public void setProductName(String productName) { ProductName = productName; } public String getLeftCount() { return LeftCount; } public void setLeftCount(String leftCount) { LeftCount = leftCount; } public String getPrice() { return Price; } public void setPrice(String price) { Price = price; } public String getAgio() { return Agio; } public void setAgio(String agio) { Agio = agio; } public String getScore() { return Score; } public void setScore(String score) { Score = score; } public String getIntrudoction() { return Intrudoction; } public void setIntrudoction(String intrudoction) { Intrudoction = intrudoction; }}4）建库package printertestdemo.test.com.textormlite;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.util.Log;import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;import com.j256.ormlite.support.ConnectionSource;import com.j256.ormlite.table.TableUtils;/** * Created by admin on 2017/4/11. */public class DBhelper extends OrmLiteSqliteOpenHelper { private static final String TABLE_NAME = "Book.db"; private static DBhelper instance; public DBhelper(Context context) { super(context, TABLE_NAME, null, 1); // TODO Auto-generated constructor stub } /** * 单例获取该Helper * * @param context * @return */ public static synchronized DBhelper getHelper(Context context) { if (instance == null) { synchronized (DBhelper.class) { if (instance == null) instance = new DBhelper(context); } } return instance; } @Override public void onCreate(SQLiteDatabase database, ConnectionSource connectionSource) { try { TableUtils.createTable(connectionSource, BookEntity.class);//书的实体类 Log.d("DBhelper", "创建表成功"); } catch (java.sql.SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override public void onUpgrade(SQLiteDatabase database, ConnectionSource connectionSource, int oldVersion, int newVersion) { try { TableUtils.createTable(connectionSource, BookEntity.class); } catch (java.sql.SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } onCreate(database, connectionSource); }}现在我们就创建一个库名为Book.db,表名为：BookEntity的数据库了，每个表对应一个单独的Dao用于操作
package printertestdemo.test.com.textormlite;import android.content.Context;import android.util.Log;import com.j256.ormlite.dao.Dao;import java.sql.SQLException;import java.util.List;/** * Created by admin on 2017/4/11. * 书的操作表 */public class BookDao { Context con; // private DBShophelps helper; private DBhelper helper; private Dao<BookEntity, Integer> personDao; // 构造函数 public BookDao(Context con) { helper = DBhelper.getHelper(con); this.con = con; } // 每个表一般我们都会单独写个Dao用于操作 public Dao<BookEntity, Integer> getPersonDao() throws java.sql.SQLException { if (personDao == null) { personDao = helper.getDao(BookEntity.class); } return personDao; } // 根据ID查询 public BookEntity selectPerson(int i) { try { BookEntity p = getPersonDao().queryForId(i); return p; } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } // 添加某条数据---添加数据 public void addPerson(BookEntity p) { try { getPersonDao().create(p); } catch (SQLException e) { } } // 删除某条数据 public void deletePerson(BookEntity p) { try { Log.d("TAG", "删除ID为" + p.getId() ); getPersonDao().deleteById(p.getId()); } catch (SQLException e) { } } //删除所有数据 public void deleteAll(List<BookEntity> listdata){ try { getPersonDao().delete(listdata); } catch (SQLException e) { e.printStackTrace(); } }// // 更新某条数据// public void updatePerson(BookEntity p, String name) {// try {//// p.setName(name);// getPersonDao().update(p);// Log.d("TAG", "修改数据后姓名为：" + p.getName());// } catch (SQLException e) {// }// } // 查询所有数据 public List<BookEntity> showPersonAll() { try { List<BookEntity> list = getPersonDao().queryForAll(); Log.d("2TAG", "查询所有数据条数：" + list.size());// for (int i = 0; i < list.size(); i++) {// Log.d("2TAG", "...." + list.get(i).getName());// } return list; } catch (SQLException e) { } return null; } public List<BookEntity> SelectStatus(String ss,String type_id ){ List<BookEntity> entity=null; try { entity= getPersonDao().queryForEq(ss,type_id);//字段，字段的值 return entity; } catch (SQLException e) { e.printStackTrace(); } return entity; }}现在这个数据库就创建好了，怎么用呢，你可以在你的工程的任意地方使用它，首先我们给这个表里插入几条数据，然后进行查询
package printertestdemo.test.com.textormlite;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.ListView;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity { List<BookEntity>list=new ArrayList<>(); private Button but1,but2; private ListView listview; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化数据 initData(); //数据插入成功，可以进行查询了 initView();//初始化控件 } private void initView() { but1= (Button) findViewById(R.id.button); but2= (Button) findViewById(R.id.button1); listview= (ListView) findViewById(R.id.listview); final ListViewAdapter adapter=new ListViewAdapter(this); listview.setAdapter(adapter); final BookDao dao=new BookDao(this); but1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //查询所有数据 List<BookEntity> list1=dao.showPersonAll(); if(list1.size()!=0){ adapter.clearDeviceList(); adapter.setDeviceList(list1); } } }); but2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //查询ProductNameLevel2为小说的 List<BookEntity> list1=dao.SelectStatus("ProductNameLevel2","小说"); if(list1.size()!=0){ adapter.clearDeviceList(); adapter.setDeviceList(list1); } } }); } private void initData() { //这里我就存入五个 BookEntity book1=new BookEntity("1","书籍","1","小说","1","言情","11111111","我爱的人","10","100","0.8","5","XXXYYYY"); list.add(book1); BookEntity book2=new BookEntity("1","书籍","1","小说","2","悬疑","1121122","破案专辑","10","200","0.9","5","XXXYYYY"); list.add(book2); BookEntity book3=new BookEntity("1","书籍","1","小说","3","历史","1131133","近代历史","10","150","0.8","5","XXXYYYY"); list.add(book3); BookEntity book4=new BookEntity("1","书籍","2","工具书","1","字典","1211214","新华字典","10","10","0.9","5","XXXYYYY"); list.add(book4); BookEntity book5=new BookEntity("1","书籍","2","工具书","2","生活百科","1211225","百科全书","10","80","0.7","5","XXXYYYY"); list.add(book5); //向Book.db里插入数据 BookDao dao=new BookDao(this); for(BookEntity entity:list){ dao.addPerson(entity); } }}Ormlite在android中使用起来非常简单，它的数据库的默认路径是在data/data/包名下，这个路径有的设备可以查看到，有的需要root后才可以查看。此外有兴趣的朋友可以看一下greendao数据库的使用
下面给出该项目的源码下载地址，有需要的可以下载一下看看，有什么不足，请及时@我，大家一起进步
http://download.csdn.net/detail/shihuiyun/9813965
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