DBFlow框架的学习笔记之入门


什么是DBFlow?

dbflow是一款android高性的ORM数据库.可以使用在进行项目中有关数据库的操作。github下载源码

1、环境配置

  1. 先导入 apt plugin库到你的classpath,以启用AnnotationProcessing(注解处理器):在工程的根目录下build.gradle代码如下:
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    buildscript {
    repositories {
    jcenter()
    }
    dependencies {
    classpath 'com.android.tools.build:gradle:2.2.2'
    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
    }
    }
    allprojects {
    repositories {
    jcenter()
    maven { url "https://www.jitpack.io" }
    }
    }

添加 classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.8’
和 maven { url “https://www.jitpack.io“ }

  1. 添加库到项目级别的build.gradle文件中

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    apply plugin: 'com.android.application'
    apply plugin: 'com.neenbedankt.android-apt'
    def dbflow_version = "3.0.0-beta4"
    android {
    compileSdkVersion 25
    buildToolsVersion "25.0.0"
    defaultConfig {
    applicationId "com.soildog.testdbflow"
    minSdkVersion 21
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
    release {
    minifyEnabled false
    proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
    }
    }
    dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
    })
    testCompile 'junit:junit:4.12'
    //support
    compile 'com.android.support:appcompat-v7:25.0.1'
    compile 'com.android.support:design:25.0.1'
    // dbflow
    apt "com.github.Raizlabs.DBFlow:dbflow-processor:${dbflow_version}"
    compile "com.github.Raizlabs.DBFlow:dbflow-core:${dbflow_version}"
    compile "com.github.Raizlabs.DBFlow:dbflow:${dbflow_version}"
    }

2.初始化DBFlow

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public class extends Application {
private static App mContext;
public void onCreate() {
super.onCreate();
FlowManager.init(this);
}
//单例模式
public static App getInstance(){
if (mContext == null) {
mContext = new App();
}
return mContext;
}
}

记得添加到AndroidManifest.xml中,name = “App”


3、创建数据库:

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import com.raizlabs.android.dbflow.annotation.Database;
/**
* Created by 24277 on 2016/12/6.
*/
//以注释的方式创建
@Database(name = AppDatabase.NAME,version = AppDatabase.VERSION)
public class AppDatabase {
//数据库名
public static final String NAME = "AppDatabase";
//数据库的版本号
public static final int VERSION = 1;
}

4、创建数据库表:

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import com.raizlabs.android.dbflow.annotation.Column;
import com.raizlabs.android.dbflow.annotation.ModelContainer;
import com.raizlabs.android.dbflow.annotation.PrimaryKey;
import com.raizlabs.android.dbflow.annotation.Table;
import com.raizlabs.android.dbflow.structure.BaseModel;
/**
* Created by 24277 on 2016/12/6.
*/
//这个表从属于AppDatabase数据库
@ModelContainer
@Table(database = AppDatabase.class)
public class Student extends BaseModel{
//注释表示创建一列 名叫id
@Column
//主键,自增长
@PrimaryKey(autoincrement = true)
public long id;
@Column
public String name;
@Column
大专栏  DBFlow框架的学习笔记之入门lass="line"> public String sex;
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + ''' +
", sex='" + sex + ''' +
'}';
}
}

(1)对类添加@Table注解
(2) 声明所连接的数据库类,这里是DBFlowDatabase。
(3)定义至少一个主键。
(4)这个类和这个类中数据库相关列的修饰符必须是包内私有或者public,这样生成的_Adapter类能够访问到它。


创建完成后,需要编译一下,点击编译按钮,或者Build->Make Project即可,它会自动生成一些数据库文件,也会提示你创建是否有误!

如果编译通过会生成一些类,位置:TestDBFLowappbuildgeneratedsourceaptdebugcomsoildogtestdbflowentity
如:Student_Table(在下文中很重要)


5、创建一个管理类用于对数据的增删该查

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package com.soildog.testdbflow.manager;
import android.content.Context;
import android.widget.Toast;
import com.raizlabs.android.dbflow.sql.language.Select;
import com.soildog.testdbflow.App;
import com.soildog.testdbflow.entity.Student;
import com.soildog.testdbflow.entity.Student_Table;
import java.util.List;
/**
* Created by 24277 on 2016/12/6.
*/
public class DBFLowManager {
private Context mContext;
private Student mStudent;
public DBFLowManager() {
mContext = App.getInstance();
mStudent = new Student();
}
public Student queryData(String name) {
Student record = new Select()
.from(Student.class)
.where(Student_Table.name.eq(name))
.querySingle();
return record;
}
public void insert(int id,String name,String sex){
mStudent = queryData(name);
if (mStudent == null) {
mStudent = new Student();
mStudent.name = name;
mStudent.sex = sex;
}
mStudent.save();
//people.update();//更新对象
//people.delete();//删除对象
//people.insert();//插入对象;
}
public List<Student> getData() {
List<Student> record = new Select()
.from(Student.class)
.queryList();
return record;
}
public void deletAllData(String name) {
List<Student> record = new Select()
.from(Student.class)
//.where("name = ?",new String[]{name})
.queryList();
for (Student student : record) {
student.delete();
}
}
public void upData(int id,String name,String sex){
Student record = new Select()
.from(Student.class)
//.where("id = ?",new String[]{""+id})
.querySingle();
if (record == null){
Toast.makeText(mContext, "没有更改的数据", Toast.LENGTH_SHORT).show();
return;
}else{
record.name = name;
record.sex = sex;
record.save();
Toast.makeText(mContext, "更新成功", Toast.LENGTH_SHORT).show();
}
}
public List<Student> queryAll() {
List<Student> record = new Select()
.from(Student.class)
.queryList();
return record;
}
}

ps:Student_Table是如何出现的那?->>是自动编译生成的。

6、最后就是写一个测试类去测试一下,这里就不多说了。。。

参考:

  1. dbflow的学习
  2. DBFLOW的初使用

android篇 未完待续。。。

原文地址:https://www.cnblogs.com/lijianming180/p/12288803.html