周末如期而至，学习也不能停止，分布式数据库实战搞起！
1）.要使用分布式的化首先就得打开权限，在config.json中添加permisssion权限。
"reqPermissions": [{ "name": "ohos.permission.DISTRIBUTED_DATASYNC" } ],
这段代码添加在abilities同一目录层级
2).再将权限调用放在onstart方法里面
requestPermissionsFromUser(new String[]{"ohos.permission.DISTRIBUTED_DATASYNC"},0);
1.UI布局
默认文件ability_main的xml代码，五个按钮
<?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:background_element="#FF34D2BA" ohos:orientation="vertical"> <DependentLayout ohos:height="50vp" ohos:width="match_parent" ohos:left_margin="30vp" ohos:right_margin="30vp" ohos:top_margin="30vp" ohos:background_element="$graphic:background"> <Button ohos:height="match_content" ohos:width="match_parent" ohos:id="$+id:write_button" ohos:text="分布式写数据" ohos:text_size="20vp" ohos:text_color="#9b9b9b" ohos:top_padding="10vp" /> </DependentLayout> <DependentLayout ohos:height="50vp" ohos:width="match_parent" ohos:left_margin="30vp" ohos:right_margin="30vp" ohos:top_margin="30vp" ohos:background_element="$graphic:background"> <Button ohos:height="match_content" ohos:width="match_parent" ohos:id="$+id:delete_button" ohos:text="分布式删除数据" ohos:text_color="#9b9b9b" ohos:text_size="20vp" ohos:top_padding="10vp" /> </DependentLayout> <DependentLayout ohos:height="50vp" ohos:width="match_parent" ohos:left_margin="30vp" ohos:right_margin="30vp" ohos:top_margin="30vp" ohos:background_element="$graphic:background"> <Button ohos:height="match_content" ohos:width="match_parent" ohos:id="$+id:read_button" ohos:text="分布式读取数据" ohos:text_color="#9b9b9b" ohos:text_size="20vp" ohos:top_padding="10vp" /> </DependentLayout> <DependentLayout ohos:height="50vp" ohos:width="match_parent" ohos:left_margin="30vp" ohos:right_margin="30vp" ohos:top_margin="30vp" ohos:background_element="$graphic:background"> <Button ohos:height="match_content" ohos:width="match_parent" ohos:id="$+id:close_button" ohos:text="分布式关闭数据" ohos:text_color="#9b9b9b" ohos:text_size="20vp" ohos:top_padding="10vp" /> </DependentLayout> <DependentLayout ohos:height="50vp" ohos:width="match_parent" ohos:left_margin="30vp" ohos:right_margin="30vp" ohos:top_margin="30vp" ohos:background_element="$graphic:background"> <Button ohos:height="match_content" ohos:width="match_parent" ohos:id="$+id:del_button" ohos:text="删除分布式数据库" ohos:text_color="#9b9b9b" ohos:text_size="20vp" ohos:top_padding="10vp" /> </DependentLayout> </DirectionalLayout>
包括按钮的形状
<?xml version="1.0" encoding="UTF-8" ?> <shape xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:shape="rectangle"> <solid ohos:color="#ffffff"/> <stroke ohos:width="3vp" ohos:color="#ffffff" /> <corners ohos:radius="20vp"/> </shape>
2.注入灵魂
Ctrl c+v一顿操作
我们可以看一看options当中的默认值
然后随便打印几个出来
接下来就自定义，有的不需要默认值，我们就修改
options.setCreateIfMissing(true) .setEncrypt(false) .setKvStoreType(KvStoreType.SINGLE_VERSION);
响应代码
public void onClick(Component component) { int componentId = component.getId(); switch (componentId) { case ResourceTable.Id_write_button: { //写入数据 try { singleKvStore.putString("test", "wo ai huawei"); System.out.println("======写入数据"); Tools.showTip(MainAbilitySlice.this,"写入数据成功"); }catch (Exception e){ e.printStackTrace(); } } break; case ResourceTable.Id_del_button: { //删除数据 try { singleKvStore.delete("test"); System.out.println("======删除数据"); Tools.showTip(MainAbilitySlice.this,"写入数据成功"); }catch (Exception e){ e.printStackTrace(); } } break; case ResourceTable.Id_read_button: { //读出数据 try { singleKvStore.getString("test"); System.out.println("======读取数据"); Tools.showTip(MainAbilitySlice.this,"读取数据成功"); }catch (Exception e){ e.printStackTrace(); } } break; case ResourceTable.Id_close_button: { //关闭数据库 try { kvManager.closeKvStore(singleKvStore); System.out.println("======关闭数据库"); Tools.showTip(MainAbilitySlice.this,"关闭数据库成功"); }catch (Exception e){ e.printStackTrace(); } } break; case ResourceTable.Id_delete_button: { //删除数据库 try { kvManager.deleteKvStore(stroeId); System.out.println("======删除数据库"); Tools.showTip(MainAbilitySlice.this,"删除数据库成功"); }catch (Exception e){ e.printStackTrace(); } } break; default: break; } }
启动第一部
启动第二部
动图演示，在一台设备写入数据，另一台能够读取，删除则无法读取
