GreenDaoUpgradeHelper-greenDao的数据库升级帮助类

官网

https://github.com/yuweiguocn/GreenDaoUpgradeHelper/blob/master/README_CH.md

简介

GreenDaoUpgradeHelper是一个greenDao的数据库升级帮助类。使用它可以很容易解决数据库升级问题,只需一行代码。

使用说明

1.在根目录的build.gradle文件的repositories内添加如下代码:

	allprojects {
		repositories {
			...
			maven { url "https://jitpack.io" }
		}
	}

2.添加依赖(greendao 3.0及以上)

	dependencies {
	        compile 'org.greenrobot:greendao:3.2.0'
	        compile 'io.github.yuweiguocn:GreenDaoUpgradeHelper:v2.2.1'
	}

如果你使用的greendao是3.0以前的版本,请使用下面的依赖:

	dependencies {
	        compile 'de.greenrobot:greendao:2.0.0'
	        compile 'com.github.yuweiguocn:GreenDaoUpgradeHelper:v1.0.1'
	}

3.添加一个新类继承DaoMaster.OpenHelper,添加构造函数并实现onUpgrade方法,在onUpgrade方法添加如下代码即可,参数为所有的Dao类:

MigrationHelper.migrate(db, new MigrationHelper.ReCreateAllTableListener() {
            
            @Override
            public void onCreateAllTables(Database db, boolean ifNotExists) {
                DaoMaster.createAllTables(db, ifNotExists);
            }
            
            @Override
            public void onDropAllTables(Database db, boolean ifExists) {
                DaoMaster.dropAllTables(db, ifExists);
            }
        },TestDataDao.class, TestData2Dao.class, TestData3Dao.class);

完整代码:

public class MySQLiteOpenHelper extends DaoMaster.OpenHelper {
    public MySQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory) {
        super(context, name, factory);
    }
    @Override
    public void onUpgrade(Database db, int oldVersion, int newVersion) {
        MigrationHelper.migrate(db, new MigrationHelper.ReCreateAllTableListener() {
                    
                    @Override
                    public void onCreateAllTables(Database db, boolean ifNotExists) {
                        DaoMaster.createAllTables(db, ifNotExists);
                    }
                    
                    @Override
                    public void onDropAllTables(Database db, boolean ifExists) {
                        DaoMaster.dropAllTables(db, ifExists);
                    }
                },TestDataDao.class, TestData2Dao.class, TestData3Dao.class);
    }
}

4.初始化

//MigrationHelper.DEBUG = true; //如果你想查看日志信息,请将DEBUG设置为true
MySQLiteOpenHelper helper = new MySQLiteOpenHelper(this, "test.db",
                null);
        daoMaster = new DaoMaster(helper.getWritableDatabase());

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