package com.example.ormdb;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import com.example.ormdb.bean.Person;
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;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;
/**
* Created by Linsa on 2017/7/13.
*/
public class MyDbHelper extends OrmLiteSqliteOpenHelper {
private static final int DB_VERSION=1;
private static final String DB_NAME="person.db3";
/**
* 用来存放Dao的地图
*/
private Map<String, Dao> daos = new HashMap<String, Dao>();
private static MyDbHelper instance;
public MyDbHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase, ConnectionSource connectionSource) {
try {
// TableUtils.createTable(connectionSource,Student.class);
TableUtils.createTable(connectionSource,Person.class);
} catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, ConnectionSource connectionSource, int i, int i1) {
}
public synchronized Dao getDao(Class clazz) throws SQLException {
Dao dao=null;
String simpleName = clazz.getSimpleName();
if (daos.containsKey(simpleName)) {
dao = daos.get(simpleName);
}else{
dao = super.getDao(clazz);
daos.put(simpleName,dao);
}
return dao;
}
/**
* 获取一个数据库的单实例
* @param context
* @return
*/
public MyDbHelper getInstance(Context context){
context = context.getApplicationContext();
if (instance==null){
synchronized (MyDbHelper.class) {
if (instance==null) {
instance = new MyDbHelper(context);
}
}
}
return instance;
}
@Override
public void close() {
super.close();
for (String key:daos.keySet()) {
Dao dao = daos.get(key);
dao=null;
}
}
}
PersonDao.class文件的详细信息，数据库操作的中间层
package com.example.ormdb.dao;
import android.content.Context;
import com.example.ormdb.MyDbHelper;
import com.example.ormdb.bean.Person;
import com.j256.ormlite.dao.Dao;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Linsa on 2017/7/13.
*/
public class PersonDao {
private Dao mPersonDao;
public PersonDao(Context context) {
try {
mPersonDao = new MyDbHelper(context).getDao(Person.class);
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* 向数据库中添加一条数据
* @param person
*/
public void add(Person person){
try {
mPersonDao.create(person);
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* 删除一条数据
* @param person
*/
public void delete(Person person){
try {
mPersonDao.delete(person);
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* 删除一组数据
*/
public void deleteCollection(ArrayList<Person> arrayList){
try {
mPersonDao.delete(arrayList);
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* 查询一条记录
* @param id
* @return
*/
public Person queryForId(int id) {
Person person = null;
try {
person = (Person) mPersonDao.queryForId(id);
} catch (SQLException e) {
e.printStackTrace();
}
return person;
}
/**
* 查询所有记录
* @return
*/
public List<Person> queryForAll() {
List<Person> themes = new ArrayList<Person>();
try {
themes = mPersonDao.queryForAll();
} catch (SQLException e) {
e.printStackTrace();
}
return themes;
}
}
数据Bean的详细代码
package com.example.ormdb.bean;
import com.j256.ormlite.field.DatabaseField;
import com.j256.ormlite.table.DatabaseTable;
import java.io.Serializable;
/**
* Created by Linsa on 2017/7/13.
*/
@DatabaseTable
public class Person implements Serializable {
//这里的这个属性是自增的属性，当设置了这个属性以后,默认也就是认定这个属性为主键，如果再设置 id=true的话，则会进行报错
//java.lang.IllegalArgumentException: Must specify one of id, generatedId, and generatedIdSequence with id
@DatabaseField(id =true,generatedId = true)
public int id;
@DatabaseField
public String name;
@DatabaseField
public int age;
@DatabaseField
public String sex;
@Override
public String toString() {
return "Person{" +
"id='" + id + '\'' +
", name='" + name + '\'' +
", age=" + age +
", sex='" + sex + '\'' +
'}';
}
}
MainActivity.java的详细代码
package com.example.ormdb;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.example.ormdb.bean.Person;
import com.example.ormdb.dao.PersonDao;
import java.util.List;
import butterknife.ButterKnife;
import butterknife.InjectView;
import butterknife.OnClick;
public class MainActivity extends AppCompatActivity {
@InjectView(R.id.btn_querry)
Button btnQuerry;
@InjectView(R.id.btn_add)
Button btnAdd;
@InjectView(R.id.btn_delete)
Button btnDelete;
private int i = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.inject(this);
}
@OnClick({R.id.btn_add, R.id.btn_querry, R.id.btn_delete})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.btn_add:
Person person = new Person();
person.name = "onex" + i;
person.sex = "女";
new PersonDao(MainActivity.this).add(person);
i++;
Toast.makeText(MainActivity.this, "add success", Toast.LENGTH_SHORT).show();
break;
case R.id.btn_querry:
List<Person> persons = new PersonDao(MainActivity.this).queryForAll();
for (Person p : persons) {
Toast.makeText(MainActivity.this, p.toString(), Toast.LENGTH_SHORT).show();
}
break;
case R.id.btn_delete:
//设置删除的时候只要设置对象的一个id就可以
//设置其他的属性也是可以的
Person delPer = new Person();
delPer.id=5;
// delPer.name="onex3";
// delPer.sex="女";
new PersonDao(MainActivity.this).delete(delPer);
Toast.makeText( MainActivity.this, "delete success!", Toast.LENGTH_SHORT).show();
break;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
new MyDbHelper(MainActivity.this).close();
}
}
数据库jar包的下载和使用：
jar包下载地址 ：http://ormlite.com/releases/
具体下载如下图所示：
UOUCCM{6WGZ)TMELJ$JUFPL.png
具体的可以查看官方文档 ：http://ormlite.com/javadoc/ormlite-android/
参考范文：http://blog.csdn.net/lmj623565791/article/details/39122981
