1. ActiveOhos功能介绍
1.1. 组件介绍
基于HarmonyOS据库进行sqlite数据库操作，创建连接时比较繁琐，本组件简化了sqlite数据库的连接，并且对HarmonyOS原生的API进行封装加强，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
2. ActiveOhos使用方法
2.1. 为应用添加sqlitelibrary-debug.har包依赖
在应用模块中调用HAR，常用的添加依赖为：依赖本地HAR
第一步：将sqlitelibrary-debug.har复制到entry\libs目录下即可（由于build.gradle中已经依赖的libs目录下的*.har，因此不需要再做修改）。
查看工程目录中build.gradle下的*.har是否存在
第二步：除了依赖har之外还需要添加外部依赖用来实现类的引入，引入方式如下，引入完之后同步即可使用。
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如果使用注解处理器的模块为“com.huawei.ohos.hap”，则需要在模块 “build.gradle”文件的“ohos”节点中添加以下配置：
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compileOptions{
annotationEnabled true
}
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如果使用注解处理器的模块为“com.huawei.ohos.library”，则需要在模块“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。
dependencies { compile files("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)}
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如果使用注解处理器的模块为“java-library”，则需要在模块 “build.gradle”文件的“dependencies”节点中配置注解处理器，并导入“ohos.jar”。
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dependencies { compile files("ohos.jar的路径","orm_annotations_java.jar的路径
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","orm_annotations_processor_java.jar的路径","javapoet_java.jar的路径")
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annotationProcessor files("orm_annotations_java.jar的路径
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","orm_annotations_processor_java.jar的路径","javapoet_java.jar的路径")}
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比如：
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以上操作无误 之后就可以进行编码了！
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3. ActiveOhos开发实现
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3.1. 主页面的布局文件
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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
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<?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. 例子代码如下
组件中有两种连接数据的方式，分别是OrmContext，RdbStore ，其中使用OrmContext连接方式时，需要定义一个实体类（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;
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);
}
public void onActive() {
super.onActive();
}
public void onForeground(Intent intent) {
super.onForeground(intent);
}
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，如果有这张表就直接使用，没有就创建表
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: //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-dev/Active_HarmonyOS
欢迎交流：[email protected]
原文链接：https://developer.huawei.com/consumer/cn/forum/topic/0202558662106980609?fid=0101303901040230869
原作者：软通动力HOS