【鸿蒙】单版本分布式数据库实战

2022-11-30 234

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简介： 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。

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;
            }
        }