站长之家查询网,怎么做vip网站,龙岗企业网站改版公司,做网站 用哪个网盘好简介LitePal是一款开源的Android数据库框架#xff0c;采用了关系映射的模式。LitePal在github上的项目地址#xff1a;github.com/LitePalFram…配置LitePaldependencies {....compile org.litepal.android:core:1.5.1}复制代码在app/src/main 目录下新建目录assets#xf…简介LitePal是一款开源的Android数据库框架采用了关系映射的模式。LitePal在github上的项目地址github.com/LitePalFram…配置LitePaldependencies {....compile org.litepal.android:core:1.5.1}复制代码在app/src/main 目录下新建目录assets在assets目录下建litepal.xml 文件复制代码标签用于指定数据库名标签用于指定版本号标签用于指定所有的映射模型在清单文件中配置LitePalApplicationandroid:nameorg.litepal.LitePalApplicationandroid:allowBackuptrueandroid:iconmipmap/ic_launcherandroid:labelstring/app_nameandroid:roundIconmipmap/ic_launcher_roundandroid:supportsRtltrueandroid:themestyle/AppTheme复制代码实战创建JavaBeanPerson.javapackage com.zhoujian.litepal.bean;import org.litepal.crud.DataSupport;/*** Created by zhoujian on 2017/3/29.*/public class Person extends DataSupport{private String name;private int age;private int id;private String weight;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 String getWeight() {return weight;}public void setWeight(String weight) {this.weight weight;}public int getId() {return id;}public void setId(int id) {this.id id;}}复制代码增删改查数据库MainActivity.javapackage com.zhoujian.litepal.activity;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.Toast;import com.zhoujian.litepal.R;import com.zhoujian.litepal.bean.Person;import org.litepal.crud.DataSupport;import org.litepal.tablemanager.Connector;import java.util.List;public class MainActivity extends AppCompatActivity{private Button mCreateDatabase;private Button mAddData;private Button mUpdateData;private Button mDeleteButton;private Button mQueryButton;Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initViews();clickEvents();}private void initViews(){mCreateDatabase (Button) findViewById(R.id.create_database);mAddData (Button) findViewById(R.id.add_data);mUpdateData (Button) findViewById(R.id.update_data);mDeleteButton (Button) findViewById(R.id.delete_data);mQueryButton (Button) findViewById(R.id.query_data);}private void clickEvents(){mCreateDatabase.setOnClickListener(new View.OnClickListener() {Overridepublic void onClick(View v) {//创建数据库Connector.getDatabase();}});mAddData.setOnClickListener(new View.OnClickListener() {Overridepublic void onClick(View v) {Person person new Person();person.setId(1);person.setName(周润发);person.setAge(62);person.setWeight(80kg);person.save();person.clearSavedState();person.setId(2);person.setName(周杰伦);person.setAge(45);person.setWeight(65kg);person.save();person.clearSavedState();person.setId(3);person.setName(周星驰);person.setAge(65);person.setWeight(70kg);person.save();Toast.makeText(MainActivity.this, 添加数据成功, Toast.LENGTH_SHORT).show();}});mUpdateData.setOnClickListener(new View.OnClickListener(){Overridepublic void onClick(View v) {Person person new Person();//把id 3 的那个人 姓名更改为周建 年龄改为28 体重改为62kgperson.setName(周建);person.setAge(28);person.setWeight(62kg);person.updateAll(id ?, 3);Toast.makeText(MainActivity.this, 更新数据成功, Toast.LENGTH_SHORT).show();}});mDeleteButton.setOnClickListener(new View.OnClickListener() {Overridepublic void onClick(View v){//删除年龄大于60的人DataSupport.deleteAll(Person.class, age ?, 60);Toast.makeText(MainActivity.this, 删除数据成功, Toast.LENGTH_SHORT).show();}});mQueryButton.setOnClickListener(new View.OnClickListener() {Overridepublic void onClick(View v){List persons DataSupport.findAll(Person.class);for (Person person: persons) {Log.d(MainActivity, person name is person.getName());Log.d(MainActivity, person weight is person.getWeight());Log.d(MainActivity, person age is person.getAge());Log.d(MainActivity, person id is person.getId());}Toast.makeText(MainActivity.this, 查询数据成功, Toast.LENGTH_SHORT).show();}});}}复制代码源码下载
