安卓ORM框架greenDAO

greenDAO   ormlite的性能对比：

上面可以看到，greeendao的insert和update效率要比ormlite快两倍左右，load更是夸张到4倍多。

    我们可以在官网（http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22de.greenrobot%22%20AND%20a%3A%22greendao-generator%22）上直接下来，也可去github项目主页上下载源码。

下面新建一个java工程，注意是java工程不是android工程,工程名GreenDaoExample。并手动在工程中新建src-gen文件夹。导入freemaker.jar和greendao-generator.jar，加入到build path。建一个如下的类：

import de.greenrobot.daogenerator.DaoGenerator;import de.greenrobot.daogenerator.Entity;import de.greenrobot.daogenerator.Property;import de.greenrobot.daogenerator.Schema;import de.greenrobot.daogenerator.ToMany;/** * Generates entities and DAOs for the example project DaoExample. * * Run it as a Java application (not Android). * * @author Markus */public class ExampleDaoGenerator{                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       public static void main(String[] args) throws Exception    {        Schema schema = new Schema(3, "com.young.do");                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               addNote(schema);        addCustomerOrder(schema);                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               new DaoGenerator().generateAll(schema, "../DaoExample/src-gen");    }                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       private static void addNote(Schema schema)    {        Entity note = schema.addEntity("Note");        note.addIdProperty();        note.addStringProperty("text").notNull();        note.addStringProperty("comment");        note.addDateProperty("date");                     }                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       private static void addCustomerOrder(Schema schema)    {        Entity customer = schema.addEntity("Customer");        customer.addIdProperty();        customer.addStringProperty("name").notNull();                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Entity order = schema.addEntity("Order");        order.setTableName("ORDERS"); // "ORDER" is a reserved keyword        order.addIdProperty();        Property orderDate = order.addDateProperty("date").getProperty();        Property customerId = order.addLongProperty("customerId").notNull().getProperty();        order.addToOne(customer, customerId);                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               ToMany customerToOrders = customer.addToMany(order, customerId);        customerToOrders.setName("orders");        customerToOrders.orderAsc(orderDate);    }                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   }

直接运行，代码生成

自动生成model和dao，随便看一个model类：

package com.young.do;// THIS CODE IS GENERATED BY greenDAO, DO NOT EDIT. Enable "keep" sections if you want to edit. /** * Entity mapped to table "NOTE". */public class Note {    private Long id;    /** Not-null value. */    private String text;    private String comment;    private java.util.Date date;    public Note() {    }    public Note(Long id) {        this.id = id;    }    public Note(Long id, String text, String comment, java.util.Date date) {        this.id = id;        this.text = text;        this.comment = comment;        this.date = date;    }    public Long getId() {        return id;    }    public void setId(Long id) {        this.id = id;    }    /** Not-null value. */    public String getText() {        return text;    }    /** Not-null value; ensure this value is available before it is saved to the database. */    public void setText(String text) {        this.text = text;    }    public String getComment() {        return comment;    }    public void setComment(String comment) {        this.comment = comment;    }    public java.util.Date getDate() {        return date;    }    public void setDate(java.util.Date date) {        this.date = date;    }}

在安卓中使用greenDAO 

 

  首先加入greendao.jar包，并把java工程中生成的类复制到安卓工程中。然后就可以进行增删改查了，具体代码如下。

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);DevOpenHelper helper = new DaoMaster.DevOpenHelper(this,"greendao_test.db", null);SQLiteDatabase db = helper.getWritableDatabase();DaoMaster daoMaster = new DaoMaster(db);DaoSession daoSession = daoMaster.newSession();final NoteDao noteDao = daoSession.getNoteDao();// noteDao.insertInTx(new ArrayList<Note>(), true);findViewById(R.id.but).setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubNote note = new Note();note.setDate(new Date());note.setId(System.currentTimeMillis());note.setText("ttteesstt");noteDao.insert(note);}});findViewById(R.id.get).setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubList<Note> l = noteDao.loadAll();StringBuilder builder = new StringBuilder();for (Note note : l) {builder.append(note.getId()).append("  ").append(note.getText()).append("  ").append(note.getDate()).append("\n");}Toast.makeText(getApplicationContext(), builder, 1).show();}});}}

由于NoteDao继承自AbstractDao，所以可以直接调用各种增删改查方法