GreenDao3.2.2简单使用

一:将GreenDao引入项目中

需要在两个地方添加配置：
1:在Project–>budld.gradle中配置如下:

dependencies {
        classpath 'com.android.tools.build:gradle:3.5.1'


        //这里是需要配置的地方
        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2'
        
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }

2:在Modle–>build.gradle中配置:

apply plugin: 'com.android.application'


apply plugin: 'org.greenrobot.greendao'

android {
    compileSdkVersion 28
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.greendaodemo003"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }


    greendao {
        schemaVersion 1 //当前数据库版本
        targetGenDir 'src/main/java'    //生成DaoMaster类文件夹
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'


    implementation 'org.greenrobot:greendao:3.2.2' // 添加库

}

配置完成后点击sync now同步即可

编写实体类

以school为例:

@Entity
    public class School {
        @Id
        private Long id;
        private String name;
    }

写完实体类可以运行一下，DaoMaster等文件包会自动生成

image.png

CRUD

使用DaoSession直接根据对象进行操作

DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(this, "school", null);
        SQLiteDatabase db = helper.getWritableDatabase();
        DaoMaster daoMaster = new DaoMaster(db);
        final DaoSession session = daoMaster.newSession();

• 增：

School school = new School((long)1,"辽宁金融职业学院");
                session.insert(school);

• 删:

School school = new School((long)1,"fly");
                session.delete(school);

• 改:

School school = new School((long)1,"ffffffffly");
                session.update(school);

• 查(查询所有):

List<School> school = session.loadAll(School.class);
                String schoolName = "";
                for (int i = 0; i < school.size(); i++) {
                    schoolName += school.get(i).getName() + ",";
                    Log.d("chen",schoolName);
                }