Android开源数据库框架-LitePal的使用

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：https://github.com/LitePalFramework/LitePal

配置LitePal

dependencies {
....
compile 'org.litepal.android:core:1.5.1'
}

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在app/src/main 目录下新建目录assets，在assets目录下建litepal.xml 文件

<?xml version="1.0" encoding="utf-8"?>
<litepal>
<dbname value="Person" ></dbname>

<version value="1" ></version>

<list>
<mapping class="com.zhoujian.litepal.bean.Person"></mapping>
</list>
</litepal>

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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LitePalApplication

<application
android:name="org.litepal.LitePalApplication"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".activity.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>

<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>

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实战

创建JavaBean

Person.Java

package 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;
}
}

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增删改查数据库

MainActivity.java

package 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;

@Override
protected 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() {
@Override
public void onClick(View v) {
//创建数据库
Connector.getDatabase();
}
});

mAddData.setOnClickListener(new View.OnClickListener() {
@Override
public 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()
{
@Override
public 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62kg
person.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() {
@Override
public 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() {
@Override
public void onClick(View v)
{
List<Person> 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();
}
});

}
}

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源码下载

源码下载：https://github.com/zeke123/LitePalDemo