Android开源数据库框架-LitePal的使用

最新推荐文章于 2021-05-27 06:55:19 发布

pengruiyu1

最新推荐文章于 2021-05-27 06:55:19 发布

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分类专栏：开源框架

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本文介绍LitePal这款Android数据库框架的使用方法，包括配置步骤、JavaBean创建及数据库的基本增删改查操作。

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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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