【軟通動力】HarmonyOS三方件開發指南(6)-ActiveOhos_sqlite組件

時間 2021-05-25

標籤 java git github sql 數據庫 app ide 佈局 gradle 欄目 Sqlite 简体版

原文原文鏈接

ActiveOhos功能介紹
1.1. 組件介紹
基於HarmonyOS據庫進行sqlite數據庫操做，建立鏈接時比較繁瑣，本組件簡化了sqlite數據庫的鏈接，而且對HarmonyOS原生的API進行封裝增強，使sqlite數據庫的讀寫更加方便。
1.2. 手機模擬器上運行效果

插入數據成功java

ActiveOhos使用方法git
2.1. 爲應用添加sqlitelibrary-debug.har包依賴github

在應用模塊中調用HAR，經常使用的添加依賴爲：依賴本地HARsql

第一步：將sqlitelibrary-debug.har複製到entry\libs目錄下便可（因爲build.gradle中已經依賴的libs目錄下的*.har，所以不須要再作修改）。數據庫

查看工程目錄中build.gradle下的*.har是否存在app

第二步：除了依賴har以外還須要添加外部依賴用來實現類的引入，引入方式以下，引入完以後同步便可使用。ide

若是使用註解處理器的模塊爲「com.huawei.ohos.hap」，則須要在模塊「build.gradle」文件的「ohos」節點中添加如下配置：佈局

compileOptions{ 
  annotationEnabled true
}

若是使用註解處理器的模塊爲「com.huawei.ohos.library」，則須要在模塊「build.gradle」文件的「dependencies」節點中配置註解處理器。查看「orm_annotations_java.jar」、「orm_annotations_processor_java.jar」、「javapoet_java.jar」 3個jar包在HUAWEI SDK中的對應目錄，並將這三個jar包導入項目中。gradle

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

,orm_annotations_processor_java.jar的路徑,javapoet_java.jar的路徑)

annotationProcessor files("orm_annotations_java.jar的路徑

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

若是使用註解處理器的模塊爲「java-library」，則須要在模塊「build.gradle」文件的「dependencies」節點中配置註解處理器，並導入「ohos.jar」。

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

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

annotationProcessor files("orm_annotations_java.jar的路徑

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

好比：

以上操做無誤以後就能夠進行編碼了！

ActiveOhos開發實現

3.1. 主頁面的佈局文件

定義四個按鈕分別實現增刪改查，定義四個Button實現請求點擊事件

<?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="查詢"

        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="刪除"

        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請求"



        ohos:text_size="50"



        ohos:top_margin="80vp"



        />







</DirectionalLayout>

3.2. 例子代碼以下

組件中有兩種鏈接數據的方式，分別是OrmContext，RdbStore ，其中使用OrmContext鏈接方式時，須要定義一個實體類（User）來和數據庫對應表名及字段，一個數據庫類 BookStore 來配合開發，代碼以下：

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: //插入數據

                //第一次使用user對應的表的時候，若是有這張表就直接使用，沒有就建立表

                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: //條件查詢

                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: //條件刪除

                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: //條件更新

                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 {

    // 此處將userId設爲了自增的主鍵。注意只有在數據類型爲包裝類型時，自增主鍵才能生效。

    @PrimaryKey(autoGenerate = true)

    private Integer userId;

    private String firstName;

    private String lastName;

    private int age;

    private double balance;

    private int ignoreColumn1;

    private int ignoreColumn2;

// 開發者自行添加字段的getter和setter 方法

項目源代碼地址：https://github.com/isoftstone...

歡迎交流：HWIS-HOS@isoftstone.com

原文連接：https://developer.huawei.com/...原做者：軟通動力HOS