Android NoSQL之SnappyDB
常规到的Android开发需要SQLite或者ORMLite这样的数据库存储数据，但是在有些情况下，基于键值对的数据存储效率更高，使用更便捷，在平台级的Java EE项目中，有一种去SQL的趋势和技术，Android平台上也有此类NoSQL技术解决方案，SnappyDB就是一款Android平台上的开源数据存储NoSQL解决方案。
SnappyDB在github上的项目地址：https://github.com/nhachicha/SnappyDB
一个简单的例子：
package app.zhangphil.app;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import com.snappydb.DB;
import com.snappydb.DBFactory;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private String TAG = "数据库调试";
private String DB_NAME = "zhangphil_db";
private String CLASS = "class";
private int studentCount = 20;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
writeDB();
}
@Override
protected void onResume() {
super.onResume();
readDB();
}
private static class Student {
public String name;
public int id;
public AClass aClass;
}
private static class AClass {
public String name;
public ArrayList<Student> students = new ArrayList<>();
}
private void writeDB() {
try {
DB snappydb = DBFactory.open(getApplicationContext(), DB_NAME);
AClass aClass = new AClass();
aClass.name = "一个班级";
for (int j = 0; j < studentCount; j++) {
Student student = new Student();
student.name = "学生" + j;
student.id = j;
student.aClass = aClass;
aClass.students.add(student);
}
snappydb.put(CLASS, aClass);
snappydb.close();
} catch (Exception e) {
e.printStackTrace();
}
}
private void readDB() {
try {
DB snappydb = DBFactory.open(getApplicationContext(), DB_NAME);
AClass aClass = snappydb.getObject(CLASS, AClass.class);
Log.d(TAG, aClass.students.size() + "");
snappydb.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
注意存储的数据结构对象要static。
不要忘记加Android的存取权限。
代码运行的结果输出正确的值20.
