鴻蒙HarmonyOS三方件開發指南(6)-ActiveOhos_sqlite組件
https://harmonyos.51cto.com/#zz
1. ActiveOhos功能介紹
1.1. 組件介紹
基于HarmonyOS據庫進行sqlite數據庫操作,創建連接時比較繁瑣,本組件簡化了sqlite數據庫的連接,并且對HarmonyOS原生的API進行封裝加強,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

2. ActiveOhos使用方法
2.1. 為應用添加sqlitelibrary-debug.har包依賴
在應用模塊中調用HAR,常用的添加依賴為:依賴本地HAR
第一步:將sqlitelibrary-debug.har復制到entry\libs目錄下即可(由于build.gradle中已經依賴的libs目錄下的*.har,因此不需要再做修改)。
查看工程目錄中build.gradle下的*.har是否存在

第二步:除了依賴har之外還需要添加外部依賴用來實現類的引入,引入方式如下,引入完之后同步即可使用。
如果使用注解處理器的模塊為“com.huawei.ohos.hap”,則需要在模塊 “build.gradle”文件的“ohos”節點中添加以下配置:
- compileOptions{
- annotationEnabled true
- }
如果使用注解處理器的模塊為“com.huawei.ohos.library”,則需要在模塊“build.gradle”文件的“dependencies”節點中配置注解處理器。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,并將這三個jar包導入項目中。
- dependencies { compile files("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")}
如果使用注解處理器的模塊為“java-library”,則需要在模塊 “build.gradle”文件的“dependencies”節點中配置注解處理器,并導入“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")}
比如:

以上操作無誤 之后就可以進行編碼了!
3. ActiveOhos開發實現
3.1. 主頁面的布局文件
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. 例子代碼如下
組件中有兩種連接數據的方式,分別是OrmContext,RdbStore ,其中使用OrmContext連接方式時,需要定義一個實體類(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,代碼如下:
- 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,如果有這張表就直接使用,沒有就創建表
- 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設為了自增的主鍵。注意只有在數據類型為包裝類型時,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
BookStore.java
- @Database(entities = {User.class}, version = 1)
- public abstract class BookStore extends OrmDatabase {
- }
項目源代碼地址:https://github.com/isoftstone-dev/Active_HarmonyOS
歡迎交流:HWIS-HOS@isoftstone.com
©著作權歸作者和HarmonyOS技術社區共同所有,如需轉載,請注明出處,否則將追究法律責任
https://harmonyos.51cto.com/#zz