【软通动力】HarmonyOS三方件开发指南(6)-ActiveOhos_sqlite组件

1. ActiveOhos功能介绍
   1.1. 组件介绍
   基于HarmonyOS据库进行sqlite数据库操做，建立链接时比较繁琐，本组件简化了sqlite数据库的链接，而且对HarmonyOS原生的API进行封装增强，使sqlite数据库的读写更加方便。
   1.2. 手机模拟器上运行效果

插入数据成功java

2. ActiveOhos使用方法git

   2.1. 为应用添加sqlitelibrary-debug.har包依赖github

在应用模块中调用HAR，经常使用的添加依赖为：依赖本地HARsql

第一步：将sqlitelibrary-debug.har复制到entry\libs目录下便可（因为build.gradle中已经依赖的libs目录下的*.har，所以不须要再作修改）。数据库

查看工程目录中build.gradle下的*.har是否存在app

第二步：除了依赖har以外还须要添加外部依赖用来实现类的引入，引入方式以下，引入完以后同步便可使用。ide

若是使用注解处理器的模块为“com.huawei.ohos.hap”，则须要在模块 “build.gradle”文件的“ohos”节点中添加如下配置：布局

compileOptions{ 
  annotationEnabled true
}

若是使用注解处理器的模块为“com.huawei.ohos.library”，则须要在模块“build.gradle”文件的“dependencies”节点中配置注解处理器。查看“orm_annotations_java.jar”、“orm_annotations_processor_java.jar” 、“javapoet_java.jar” 3个jar包在HUAWEI SDK中的对应目录，并将这三个jar包导入项目中。gradle

dependencies { compile files("orm_annotations_java.jar的路径ui

,orm_annotations_processor_java.jar的路径,javapoet_java.jar的路径)

annotationProcessor files("orm_annotations_java.jar的路径

,orm_annotations_processor_java.jar的路径,javapoet_java.jar的路径)}

若是使用注解处理器的模块为“java-library”，则须要在模块 “build.gradle”文件的“dependencies”节点中配置注解处理器，并导入“ohos.jar”。

dependencies { compile files("ohos.jar的路径","orm_annotations_java.jar的路径

","orm_annotations_processor_java.jar的路径","javapoet_java.jar的路径")

annotationProcessor files("orm_annotations_java.jar的路径

","orm_annotations_processor_java.jar的路径","javapoet_java.jar的路径")}

好比：

以上操做无误 以后就能够进行编码了！

3. ActiveOhos开发实现

3.1. 主页面的布局文件

定义四个按钮分别实现增删改查，定义四个Button实现请求点击事件

<?xml version="1.0" encoding="utf-8"?>

<DirectionalLayout

    xmlns:ohos="http://schemas.huawei.com/res/ohos"

    ohos:height="match_parent"

    ohos:width="match_parent"

    ohos:orientation="vertical">



    <Button

        ohos:id="$+id:btn_insert"

        ohos:height="match_content"

        ohos:width="80fp"

        ohos:text_color="red"

        ohos:text="插入"

        ohos:text_size="20fp"

        ohos:weight="100fp"/>



    <Button

        ohos:id="$+id:btn_query"

        ohos:height="match_content"

        ohos:width="100fp"

        ohos:text_color="blue"

        ohos:text="查询"

        ohos:text_size="20fp"

        ohos:weight="100fp"/>



    <Button

        ohos:id="$+id:btn_update"

        ohos:height="match_content"

        ohos:width="100fp"

        ohos:text_color="green"

        ohos:text="更新"

        ohos:text_size="20fp"

        ohos:weight="100fp"/>



    <Button

        ohos:id="$+id:btn_delete"

        ohos:height="match_content"

        ohos:width="100fp"

        ohos:text_color="black"

        ohos:text="删除"

        ohos:text_size="20fp"

        ohos:weight="100fp"/>



    <ListContainer

        ohos:id="$+id:listText"

        ohos:height="match_parent"

        ohos:width="match_parent"/>



</DirectionalLayout>







        ohos:width="match_content"



        ohos:background_element="$graphic:background_ability_main"



        ohos:layout_alignment="horizontal_center"



        ohos:text="get请求"



        ohos:text_size="50"



        ohos:top_margin="80vp"



        />







</DirectionalLayout>

3.2. 例子代码以下

组件中有两种链接数据的方式，分别是OrmContext，RdbStore ，其中使用OrmContext链接方式时，须要定义一个实体类（User）来和数据库对应表名及字段，一个数据库类 BookStore 来配合开发，代码以下：

MainAbilitySlice



import com.example.myapplication.BookStore;

import com.example.myapplication.ResourceTable;

import com.example.myapplication.User;

import com.example.sqlitelibrary.DBManage;

import com.example.sqlitelibrary.DBOrmContext;

import com.example.sqlitelibrary.utils.Log;

import ohos.aafwk.ability.AbilitySlice;

import ohos.aafwk.content.Intent;

import ohos.agp.components.Button;

import ohos.agp.components.Component;

import ohos.data.DatabaseHelper;

import ohos.data.orm.OrmContext;

import ohos.data.orm.OrmPredicates;

import ohos.data.rdb.RdbStore;

import ohos.data.rdb.ValuesBucket;



import java.util.ArrayList;

import java.util.List;



public class MainAbilitySlice extends AbilitySlice implements Component.ClickedListener {

    

    private DatabaseHelper helper;

    private RdbStore store;

    private  OrmContext context;

    @Override

    public void onStart(Intent intent) {

        super.onStart(intent);

        super.setUIContent(ResourceTable.Layout_ability_main);

        helper = new DatabaseHelper(this);

        DBManage dbManger = new DBManage("user.db","user");

        context = dbManger.getConnectionContext(helper, BookStore.class);

//         DBManage dbManger = new DBManage("user.db");

//         store = dbManger.getConnectionStore(helper,"user");

        Button btnInsert = (Button) findComponentById(ResourceTable.Id_btn_insert);

        Button btnQuery = (Button) findComponentById(ResourceTable.Id_btn_query);

        Button btnDelete = (Button) findComponentById(ResourceTable.Id_btn_delete);

        Button btnUpdate = (Button) findComponentById(ResourceTable.Id_btn_update);

        btnInsert.setClickedListener(this::onClick);

        btnQuery.setClickedListener(this::onClick);

        btnDelete.setClickedListener(this::onClick);

        btnUpdate.setClickedListener(this::onClick);

    }



    @Override

    public void onActive() {

        super.onActive();

    }



    @Override

    public void onForeground(Intent intent) {

        super.onForeground(intent);

    }



    @Override

    public void onClick(Component component) {

//        RdbStoreManage rdbStoreMange = new RdbStoreManage();

//        ValuesBucket values = new ValuesBucket();

//        values.putInteger("id", 1);

//        values.putString("name", "zhangsan");

//        values.putInteger("age", 18);

//        values.putDouble("salary", 100.5);

//        values.putByteArray("blobType", new byte[] {1, 2, 3});

//        rdbStoreMange.setSql(store, "insert into user values(zhangsan, 18, 100.5, byte[1,2,3])");

//        long id = rdbStoreMange.insert(store,"user", values);

//        System.out.println(id);



        DBOrmContext dbOrmContext = new DBOrmContext();

        switch (component.getId()) {

            case ResourceTable.Id_btn_insert: //插入数据

                //第一次使用user对应的表的时候，若是有这张表就直接使用，没有就建立表

                User user = new User();

                user.setFirstName("Zhang");

                user.setLastName("San");

                user.setAge(29);

                user.setBalance(100.51);

                boolean b = dbOrmContext.insert(context, user);

                Log.i("插入成功");

                System.out.println(b);

                break;

            case ResourceTable.Id_btn_query: //条件查询

                List<User> users = new ArrayList<>();

                OrmPredicates query = context.where(User.class).equalTo("lastName", "San");

                users = dbOrmContext.query(context, query);

                break;

            case ResourceTable.Id_btn_delete: //条件删除

                OrmPredicates delete = context.where(User.class).equalTo("lastName", "San");

                int delete1 = dbOrmContext.delete(context, delete);

                System.out.println(delete1);

                break;

            case ResourceTable.Id_btn_update: //条件更新

                ValuesBucket valuesBucket = new ValuesBucket();

                valuesBucket.putInteger("age", 31);

                valuesBucket.putString("firstName", "Zhang");

                valuesBucket.putString("lastName", "San");

                valuesBucket.putDouble("balance", 300.51);

                OrmPredicates update = context.where(User.class).equalTo("userId", 1);

                int update1 = dbOrmContext.update(context, valuesBucket, update);

                System.out.println(update1);

                break;

        }

        dbOrmContext.flush(context);

    }

}

user.java

@Entity(tableName = "user", ignoredColumns = {"ignoreColumn1", "ignoreColumn2"},

        indices = {@Index(value = {"firstName", "lastName"}, name = "name_index", unique = true)})

public class User extends OrmObject {

    // 此处将userId设为了自增的主键。注意只有在数据类型为包装类型时，自增主键才能生效。

    @PrimaryKey(autoGenerate = true)

    private Integer userId;

    private String firstName;

    private String lastName;

    private int age;

    private double balance;

    private int ignoreColumn1;

    private int ignoreColumn2;

// 开发者自行添加字段的getter和setter 方法

项目源代码地址：https://github.com/isoftstone...

欢迎交流：HWIS-HOS@isoftstone.com

原文连接：https://developer.huawei.com/...原做者：软通动力HOS