Android中结合OrmLite for android组件对SQLite的CRUD(增删改查)操作实例（二）

4】包com.andyidea.db下DatabaseHelper.java源码：

package com.andyidea.db;

import java.sql.SQLException;

import Android.content.Context;
import Android.database.sqlite.SQLiteDatabase;
import Android.util.Log;

import com.andyidea.bean.Student;
import com.j256.ormlite.Android.apptools.OrmLiteSqliteOpenHelper;
import com.j256.ormlite.dao.Dao;
import com.j256.ormlite.support.ConnectionSource;
import com.j256.ormlite.table.TableUtils;

public class DatabaseHelper extends OrmLiteSqliteOpenHelper {

    private static final String DATABASE_NAME = "ormlite.db";
    private static final int DATABASE_VERSION = 1;

    private Dao<Student,Integer> stuDao = null;

    public DatabaseHelper(Context context){
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    /**
     * 创建SQLite数据库
     */
    @Override
    public void onCreate(SQLiteDatabase sqliteDatabase, ConnectionSource connectionSource) {
        try {
            TableUtils.createTable(connectionSource, Student.class);
        } catch (SQLException e) {
            Log.e(DatabaseHelper.class.getName(), "Unable to create datbases", e);
        }
    }

    /**
     * 更新SQLite数据库
     */
    @Override
    public void onUpgrade(
            SQLiteDatabase sqliteDatabase,
            ConnectionSource connectionSource,
            int oldVer,
            int newVer) {
        try {
            TableUtils.dropTable(connectionSource, Student.class, true);
            onCreate(sqliteDatabase, connectionSource);
        } catch (SQLException e) {
            Log.e(DatabaseHelper.class.getName(),
                    "Unable to upgrade database from version " + oldVer + " to new "
                    + newVer, e);
        }
    }

    public Dao<Student,Integer> getStudentDao() throws SQLException{
        if(stuDao == null){
            stuDao = getDao(Student.class);
        }
        return stuDao;
    }

}

【5】包com.andyidea.ormsqlite下源码：

MainActivity.java源码：

package com.andyidea.ormsqlite;

import java.sql.SQLException;

import com.andyidea.bean.Student;
import com.andyidea.db.DatabaseHelper;
import com.j256.ormlite.Android.apptools.OrmLiteBaseActivity;
import com.j256.ormlite.dao.Dao;

import Android.content.Intent;
import Android.os.Bundle;
import Android.view.Menu;
import Android.view.MenuItem;
import Android.widget.EditText;

public class MainActivity extends OrmLiteBaseActivity<DatabaseHelper> {

    private EditText stuNO;
    private EditText stuName;
    private EditText stuAge;
    private EditText stuSex;
    private EditText stuScore;
    private EditText stuAddress;

    private Student mStudent;
    private Dao<Student,Integer> stuDao;

    private final int MENU_ADD = Menu.FIRST;
    private final int MENU_VIEWALL = Menu.FIRST+1;
    private final int MENU_EDIT = Menu.FIRST+2;

    private Bundle mBundle = new Bundle();

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        initializeViews();
    }

    /**
     * 初始化UI界面
     */
    private void initializeViews(){
        stuNO = (EditText)findViewById(R.id.stuno);
        stuName = (EditText)findViewById(R.id.name);
        stuAge = (EditText)findViewById(R.id.age);
        stuSex = (EditText)findViewById(R.id.sex);
        stuScore = (EditText)findViewById(R.id.score);
        stuAddress = (EditText)findViewById(R.id.address);

        mBundle = getIntent().getExtras();
        if(mBundle!=null && mBundle.getString("action").equals("viewone")){
            mStudent = (Student)getIntent().getSerializableExtra("entity");
            setStudentUIData(mStudent);
        }

        if(mBundle!=null && mBundle.getString("action").equals("edit")){
            mStudent = (Student)getIntent().getSerializableExtra("entity");
            setStudentUIData(mStudent);
        }
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        if(mBundle!=null && mBundle.getString("action").equals("viewone"))
            return false;
        else
            return super.onPrepareOptionsMenu(menu);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        if(mBundle!=null && mBundle.getString("action").equals("edit")){
            menu.add(1,MENU_EDIT,0,"保存");
        }else{
            menu.add(0,MENU_ADD,0,"增加");
            menu.add(0,MENU_VIEWALL,0,"查看");
        }
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case MENU_ADD:
            try {
                stuDao = getHelper().getStudentDao();
                getStudentData();
                if(mStudent != null){
                    //创建记录项
                    stuDao.create(mStudent);
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
            break;
        case MENU_VIEWALL:
            Intent intent = new Intent();
            intent.setClass(MainActivity.this, StudentListActivity.class);
            startActivity(intent);
            break;
        case MENU_EDIT:
            try {
                getStudentData();
                stuDao = getHelper().getStudentDao();
                if(mStudent != null){
                    //更新某记录项
                    stuDao.update(mStudent);
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
            break;
        default:
            break;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * 获取界面值(实体信息)
     */
    private void getStudentData(){
        mStudent = new Student();
        mStudent.setStuNO(stuNO.getText().toString());
        mStudent.setName(stuName.getText().toString());
        mStudent.setAge(Integer.parseInt(stuAge.getText().toString()));
        mStudent.setSex(stuSex.getText().toString());
        mStudent.setScore(Double.parseDouble(stuScore.getText().toString()));
        mStudent.setAddress(stuAddress.getText().toString());
    }

    /**
     * 赋值给UI界面
     * @param student
     */
    private void setStudentUIData(Student student){
        stuNO.setText(student.getStuNO());
        stuName.setText(student.getName());
        stuAge.setText(String.valueOf(student.getAge()));
        stuSex.setText(student.getSex());
        stuScore.setText(String.valueOf(student.getScore()));
        stuAddress.setText(student.getAddress());
    }
}