android数据库 greendao:3.1

2023年4月22日 369次阅读来源: Dijkstra算法

demo使用时看了别人的稍作修改更易懂，不多说，直接贴代码，仅用于学习

1、gradle导包

apply plugin: 'com.android.application'
/**
 * 配置greendao3.1
 */
apply plugin:'org.greenrobot.greendao'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.yueniu.greendao3_1"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    /**
     * 配置greendao3.1
     */
    greendao{
        schemaVersion 4
        daoPackage'com.yueniu.greendao3_1'
        targetGenDir'src/main/java'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'org.greenrobot:greendao:3.1.1'
    compile 'org.greenrobot:greendao-generator:3.1.0'
    compile 'com.android.support:appcompat-v7:24.2.1'
}

/**
 * 配置greendao3.1
 */
buildscript {
    repositories {
        jcenter()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.5.0'
        classpath 'org.greenrobot:greendao-gradle-plugin:3.1.1'
    }
}

2、sql对象

package com.yueniu.greendao3_1;


import android.database.sqlite.SQLiteDatabase;

/**
 * Created by maoshenbo on 2016/9/22 13:23.
 */
public class GreenDaoUtils {

    private DaoMaster.DevOpenHelper mHelper;
    private SQLiteDatabase db;
    private DaoMaster mDaoMaster;
    private DaoSession mDaoSession;

    private static GreenDaoUtils greenDaoUtils;

    private GreenDaoUtils(){}

    public static GreenDaoUtils getSingleTon(){
        if (greenDaoUtils==null){
            greenDaoUtils=new GreenDaoUtils();
        }
        return greenDaoUtils;
    }

    private void initGreenDao(){
        mHelper=new DaoMaster.DevOpenHelper(MyApplication.getInstances(),"test-db",null);
        db=mHelper.getWritableDatabase();
        mDaoMaster=new DaoMaster(db);
        mDaoSession=mDaoMaster.newSession();
    }

    public DaoSession getmDaoSession() {
        if (mDaoMaster==null){
            initGreenDao();
        }
        return mDaoSession;
    }

    public SQLiteDatabase getDb() {
        if (db==null){
            initGreenDao();
        }
        return db;
    }

}

3、
DaoMaster

package com.yueniu.greendao3_1;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.util.Log;

import org.greenrobot.greendao.AbstractDaoMaster;
import org.greenrobot.greendao.database.StandardDatabase;
import org.greenrobot.greendao.database.Database;
import org.greenrobot.greendao.database.DatabaseOpenHelper;
import org.greenrobot.greendao.identityscope.IdentityScopeType;


// THIS CODE IS GENERATED BY greenDAO, DO NOT EDIT.
/**
 * Master of DAO (schema version 4): knows all DAOs.
 */
public class DaoMaster extends AbstractDaoMaster {
    public static final int SCHEMA_VERSION = 4;

    /** Creates underlying database table using DAOs. */
    public static void createAllTables(Database db, boolean ifNotExists) {
        UserDao.createTable(db, ifNotExists);
    }

    /** Drops underlying database table using DAOs. */
    public static void dropAllTables(Database db, boolean ifExists) {
        UserDao.dropTable(db, ifExists);
    }

    /**
     * WARNING: Drops all table on Upgrade! Use only during development.
     * Convenience method using a {@link DevOpenHelper}.
     */
    public static DaoSession newDevSession(Context context, String name) {
        Database db = new DevOpenHelper(context, name).getWritableDb();
        DaoMaster daoMaster = new DaoMaster(db);
        return daoMaster.newSession();
    }

    public DaoMaster(SQLiteDatabase db) {
        this(new StandardDatabase(db));
    }

    public DaoMaster(Database db) {
        super(db, SCHEMA_VERSION);
        registerDaoClass(UserDao.class);
    }

    public DaoSession newSession() {
        return new DaoSession(db, IdentityScopeType.Session, daoConfigMap);
    }

    public DaoSession newSession(IdentityScopeType type) {
        return new DaoSession(db, type, daoConfigMap);
    }

    /**
     * Calls {@link #createAllTables(Database, boolean)} in {@link #onCreate(Database)} -
     */
    public static abstract class OpenHelper extends DatabaseOpenHelper {
        public OpenHelper(Context context, String name) {
            super(context, name, SCHEMA_VERSION);
        }

        public OpenHelper(Context context, String name, CursorFactory factory) {
            super(context, name, factory, SCHEMA_VERSION);
        }

        @Override
        public void onCreate(Database db) {
            Log.i("greenDAO", "Creating tables for schema version " + SCHEMA_VERSION);
            createAllTables(db, false);
        }
    }

    /** WARNING: Drops all table on Upgrade! Use only during development. */
    public static class DevOpenHelper extends OpenHelper {
        public DevOpenHelper(Context context, String name) {
            super(context, name);
        }

        public DevOpenHelper(Context context, String name, CursorFactory factory) {
            super(context, name, factory);
        }

        @Override
        public void onUpgrade(Database db, int oldVersion, int newVersion) {
            Log.i("greenDAO", "Upgrading schema from version " + oldVersion + " to " + newVersion + " by dropping all tables");
            dropAllTables(db, true);
            onCreate(db);
        }
    }

}

3、
DaoSession

package com.yueniu.greendao3_1;

import java.util.Map;

import org.greenrobot.greendao.AbstractDao;
import org.greenrobot.greendao.AbstractDaoSession;
import org.greenrobot.greendao.database.Database;
import org.greenrobot.greendao.identityscope.IdentityScopeType;
import org.greenrobot.greendao.internal.DaoConfig;

import com.yueniu.greendao3_1.User;

import com.yueniu.greendao3_1.UserDao;

// THIS CODE IS GENERATED BY greenDAO, DO NOT EDIT.

/**
 * {@inheritDoc}
 * 
 * @see org.greenrobot.greendao.AbstractDaoSession
 */
public class DaoSession extends AbstractDaoSession {

    private final DaoConfig userDaoConfig;

    private final UserDao userDao;

    public DaoSession(Database db, IdentityScopeType type, Map<Class<? extends AbstractDao<?, ?>>, DaoConfig>
            daoConfigMap) {
        super(db);

        userDaoConfig = daoConfigMap.get(UserDao.class).clone();
        userDaoConfig.initIdentityScope(type);

        userDao = new UserDao(userDaoConfig, this);

        registerDao(User.class, userDao);
    }
    
    public void clear() {
        userDaoConfig.clearIdentityScope();
    }

    public UserDao getUserDao() {
        return userDao;
    }

}

4、
User

package com.yueniu.greendao3_1;

import org.greenrobot.greendao.annotation.Entity;
import org.greenrobot.greendao.annotation.Generated;
import org.greenrobot.greendao.annotation.Id;

/**
 * Created by maoshenbo on 2016/9/22 13:21.
 */
@Entity
public class User {
    @Id(autoincrement = true)
    private Long id;
    private String name;
    private int age;
    private boolean isBoy;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public boolean isBoy() {
        return isBoy;
    }

    public void setBoy(boolean boy) {
        isBoy = boy;
    }

    public boolean getIsBoy() {
        return this.isBoy;
    }

    public void setIsBoy(boolean isBoy) {
        this.isBoy = isBoy;
    }

    @Generated(hash = 1724489812)
    public User(Long id, String name, int age, boolean isBoy) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.isBoy = isBoy;
    }

    @Generated(hash = 586692638)
    public User() {
    }
}

5、
UserDao

package com.yueniu.greendao3_1;

import android.database.Cursor;
import android.database.sqlite.SQLiteStatement;

import org.greenrobot.greendao.AbstractDao;
import org.greenrobot.greendao.Property;
import org.greenrobot.greendao.internal.DaoConfig;
import org.greenrobot.greendao.database.Database;
import org.greenrobot.greendao.database.DatabaseStatement;

// THIS CODE IS GENERATED BY greenDAO, DO NOT EDIT.
/** 
 * DAO for table "USER".
*/
public class UserDao extends AbstractDao<User, Long> {

    public static final String TABLENAME = "USER";

    /**
     * Properties of entity User.<br/>
     * Can be used for QueryBuilder and for referencing column names.
     */
    public static class Properties {
        public final static Property Id = new Property(0, Long.class, "id", true, "_id");
        public final static Property Name = new Property(1, String.class, "name", false, "NAME");
        public final static Property Age = new Property(2, int.class, "age", false, "AGE");
        public final static Property IsBoy = new Property(3, boolean.class, "isBoy", false, "IS_BOY");
    }


    public UserDao(DaoConfig config) {
        super(config);
    }
    
    public UserDao(DaoConfig config, DaoSession daoSession) {
        super(config, daoSession);
    }

    /** Creates the underlying database table. */
    public static void createTable(Database db, boolean ifNotExists) {
        String constraint = ifNotExists? "IF NOT EXISTS ": "";
        db.execSQL("CREATE TABLE " + constraint + "\"USER\" (" + //
                "\"_id\" INTEGER PRIMARY KEY AUTOINCREMENT ," + // 0: id
                "\"NAME\" TEXT," + // 1: name
                "\"AGE\" INTEGER NOT NULL ," + // 2: age
                "\"IS_BOY\" INTEGER NOT NULL );"); // 3: isBoy
    }

    /** Drops the underlying database table. */
    public static void dropTable(Database db, boolean ifExists) {
        String sql = "DROP TABLE " + (ifExists ? "IF EXISTS " : "") + "\"USER\"";
        db.execSQL(sql);
    }

    @Override
    protected final void bindValues(DatabaseStatement stmt, User entity) {
        stmt.clearBindings();
 
        Long id = entity.getId();
        if (id != null) {
            stmt.bindLong(1, id);
        }
 
        String name = entity.getName();
        if (name != null) {
            stmt.bindString(2, name);
        }
        stmt.bindLong(3, entity.getAge());
        stmt.bindLong(4, entity.getIsBoy() ? 1L: 0L);
    }

    @Override
    protected final void bindValues(SQLiteStatement stmt, User entity) {
        stmt.clearBindings();
 
        Long id = entity.getId();
        if (id != null) {
            stmt.bindLong(1, id);
        }
 
        String name = entity.getName();
        if (name != null) {
            stmt.bindString(2, name);
        }
        stmt.bindLong(3, entity.getAge());
        stmt.bindLong(4, entity.getIsBoy() ? 1L: 0L);
    }

    @Override
    public Long readKey(Cursor cursor, int offset) {
        return cursor.isNull(offset + 0) ? null : cursor.getLong(offset + 0);
    }    

    @Override
    public User readEntity(Cursor cursor, int offset) {
        User entity = new User( //
            cursor.isNull(offset + 0) ? null : cursor.getLong(offset + 0), // id
            cursor.isNull(offset + 1) ? null : cursor.getString(offset + 1), // name
            cursor.getInt(offset + 2), // age
            cursor.getShort(offset + 3) != 0 // isBoy
        );
        return entity;
    }
     
    @Override
    public void readEntity(Cursor cursor, User entity, int offset) {
        entity.setId(cursor.isNull(offset + 0) ? null : cursor.getLong(offset + 0));
        entity.setName(cursor.isNull(offset + 1) ? null : cursor.getString(offset + 1));
        entity.setAge(cursor.getInt(offset + 2));
        entity.setIsBoy(cursor.getShort(offset + 3) != 0);
     }
    
    @Override
    protected final Long updateKeyAfterInsert(User entity, long rowId) {
        entity.setId(rowId);
        return rowId;
    }
    
    @Override
    public Long getKey(User entity) {
        if(entity != null) {
            return entity.getId();
        } else {
            return null;
        }
    }

    @Override
    public boolean hasKey(User entity) {
        return entity.getId() != null;
    }

    @Override
    protected final boolean isEntityUpdateable() {
        return true;
    }
    
}

6、使用

package com.yueniu.greendao3_1;

import android.database.Cursor;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.List;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private String TAG = "MainActivity";
    TextView text, text2;
    UserDao dao;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        dao = GreenDaoUtils.getSingleTon().getmDaoSession().getUserDao();

        Button zeng = (Button) findViewById(R.id.zeng);
        Button shan = (Button) findViewById(R.id.shan);
        Button gai = (Button) findViewById(R.id.gai);
        Button cha = (Button) findViewById(R.id.cha);
        text = (TextView) findViewById(R.id.text);
        text2 = (TextView) findViewById(R.id.text2);
        zeng.setOnClickListener(this);
        shan.setOnClickListener(this);
        gai.setOnClickListener(this);
        cha.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.zeng:
                User insertData=new User(null,"77",21,false);
                dao.insert(insertData);
                text.setText(insertData.getName());
                break;
            case R.id.shan:
               /* List<User> list = dao.loadAll();
                for(int i=0;i<list.size();i++){
                    //dao.deleteInTx(list);
                    dao.deleteByKey(list.get(i).getId());
                }*/

                Cursor cursor = GreenDaoUtils.getSingleTon().getDb().rawQuery("select * from USER where name=?", new String[]{"77"});
                dao.deleteByKey(dao.readEntity(cursor, 1).getId());


                //User user = dao.load((long)2);
//                String s = text.getText().toString();
//                long l = Long.parseLong(s);
//                dao.deleteByKey(l);
                //dao.deleteByKey((long)2);
                break;
            case R.id.gai:
                List<User> userss = dao.loadAll();
                User user=new User(userss.get(0).getId(),"88",22,true);
                dao.update(user);
                text.setText(user.getName());
                break;
            case R.id.cha:
                List<User> users = dao.loadAll();
                Log.i(TAG, "users.size="+users.size());
                for (int i=0;i<users.size();i++){
                    Log.i("woyaokk","结果："+users.get(i).getName().toString());
                }
                break;
        }
    }
}

    原文作者：Dijkstra算法
    原文地址: https://blog.csdn.net/bsmmaoshenbo/article/details/61193614
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