Skip to content

D
Docs

OpenHarmony / Docs
大约 2 年 前同步成功

通知 161
Star 293
Fork 28
D
Docs
未验证 提交 fd1b7282 编写于 作者: O openharmony_ci 提交者： Gitee
浏览文件
操作

!14408 [翻译完成】#I69V2G 

Merge pull request !14408 from Annie_wang/PR13383
上级 19cbf3ac 8c9d2aa4
显示空白变更内容
内联 并排
Showing with 194 addition and 199 deletion
en/application-dev/database/database-datashare-guidelines.md
浏览文件 @ fd1b7282
......@@ -34,11 +34,9 @@ There are two roles in **DataShare**:
- Data provider: adds, deletes, modifies, and queries data, opens files, and shares data.
- Data consumer: accesses the data provided by the provider using **DataShareHelper**.
Examples are given below.
### Data Provider Application Development (Only for System Applications)
[DataShareExtensionAbility](../reference/apis/js-apis-application-dataShareExtensionAbility.md) provides the following APIs. You can override the APIs as required.
[DataShareExtensionAbility](../reference/apis/js-apis-application-dataShareExtensionAbility.md) provides the following APIs. You can override these APIs as required.
- **onCreate**
......@@ -82,14 +80,14 @@ Before implementing a **DataShare** service, create a **DataShareExtensionAbilit
```ts
import Extension from '@ohos.application.DataShareExtensionAbility';
import rdb from '@ohos.data.rdb';
import rdb from '@ohos.data.relationalStore';
import fileIo from '@ohos.fileio';
import dataSharePredicates from '@ohos.data.dataSharePredicates';
```
4. Override the **DataShareExtensionAbility** APIs based on actual requirements. For example, if the data provider provides only data query, override only **query()**.
5. Override **DataShareExtensionAbility** APIs based on actual requirements. For example, if the data provider provides only data query, override only **query()**.
5. Implement the data provider services. For example, implement data storage of the data provider by using a database, reading and writing files, or accessing the network.
6. Implement the data provider services. For example, implement data storage of the data provider by using a database, reading and writing files, or accessing the network.
```ts
const DB_NAME = "DB00.db";
......@@ -106,16 +104,19 @@ Before implementing a **DataShare** service, create a **DataShareExtensionAbilit
// Override onCreate().
onCreate(want, callback) {
result = this.context.cacheDir + '/datashare.txt'
result = this.context.cacheDir + '/datashare.txt';
// Create an RDB store.
rdb.getRdbStore(this.context, {
name: DB_NAME
}, 1, function (err, data) {
name: DB_NAME,
securityLevel: rdb.SecurityLevel.S1
}, function (err, data) {
rdbStore = data;
rdbStore.executeSql(DDL_TBL_CREATE, [], function (err) {
console.log('DataShareExtAbility onCreate, executeSql done err:' + JSON.stringify(err));
});
if (callbakc) {
callback();
}
});
}
......@@ -142,17 +143,14 @@ Before implementing a **DataShare** service, create a **DataShareExtensionAbilit
};
```
7. Define **DataShareExtensionAbility** in **module.json5**.
6. Define **DataShareExtensionAbility** in **module.json5**.
| Field | Description |
| --------- | ------------------------------------------------------------ |
| Field| Description |
| ------------ | ------------------------------------------------------------ |
| "name" | Ability name, corresponding to the **ExtensionAbility** class name derived from **Ability**. |
| "type" | Ability type. The value is **dataShare**, indicating the development is based on the **datashare** template. |
| "type" | Ability type. The value is **dataShare**, indicating the development is based on the **datashare** template.|
| "uri" | URI used for communication. It is the unique identifier for the data consumer to connect to the provider. |
| "visible" | Whether it is visible to other applications. Data sharing is allowed only when the value is **true**. |
| | |
| "visible" | Whether it is visible to other applications. Data sharing is allowed only when the value is **true**.|
**module.json5 example**
......@@ -170,8 +168,6 @@ Before implementing a **DataShare** service, create a **DataShareExtensionAbilit
]
```
### Data Consumer Application Development
1. Import dependencies.
......@@ -212,7 +208,7 @@ Before implementing a **DataShare** service, create a **DataShareExtensionAbilit
let valuesBucket = { "name": "ZhangSan", "age": 21, "isStudent": false, "Binary": new Uint8Array([1, 2, 3]) };
let updateBucket = { "name": "LiSi", "age": 18, "isStudent": true, "Binary": new Uint8Array([1, 2, 3]) };
let predicates = new dataSharePredicates.DataSharePredicates();
let valArray = new Array("*");
let valArray = ['*'];
// Insert a piece of data.
dsHelper.insert(dseUri, valuesBucket, (err, data) => {
console.log("dsHelper insert result: " + data);
......
en/application-dev/database/database-relational-guidelines.md
浏览文件 @ fd1b7282
......@@ -180,7 +180,7 @@ You can obtain the distributed table name for a remote device based on the local
### Transaction
Table 15 Transaction APIs
**Table 15** Transaction APIs
| Class | API | Description |
| -------- | ----------------------- | --------------------------------- |
......@@ -202,44 +202,82 @@ Table 15 Transaction APIs
```js
import data_rdb from '@ohos.data.relationalStore'
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility'
// Obtain the context.
let context = featureAbility.getContext()
const CREATE_TABLE_TEST = "CREATE TABLE IF NOT EXISTS test (" + "id INTEGER PRIMARY KEY AUTOINCREMENT, " + "name TEXT NOT NULL, " + "age INTEGER, " + "salary REAL, " + "blobType BLOB)";
const STORE_CONFIG = {
name: "RdbTest.db",
securityLevel: data_rdb.SecurityLevel.S1
}
const STORE_CONFIG = { name: "RdbTest.db",
securityLevel: data_rdb.SecurityLevel.S1}
// Assume that the current RDB store version is 3.
data_rdb.getRdbStore(context, STORE_CONFIG, function (err, rdbStore) {
rdbStore.executeSql(CREATE_TABLE_TEST)
console.info('create table done.')
// When an RDB store is created, the default version is 0.
if (rdbStore.version == 0) {
rdbStore.executeSql("CREATE TABLE IF NOT EXISTS student (id INTEGER PRIMARY KEY AUTOINCREMENT, score REAL);", null)
// Set the RDB store version. The input parameter must be an integer greater than 0.
rdbStore.version = 3
}
// When an app is updated to the current version, the RDB store needs to be updated from version 1 to version 2.
if (rdbStore.version != 3 && rdbStore.version == 1) {
// version = 1: table structure: student (id, age) => version = 2: table structure: student (id, age, score)
rdbStore.executeSql("ALTER TABLE student ADD COLUMN score REAL", null)
rdbStore.version = 2
}
// When an app is updated to the current version, the RDB store needs to be updated from version 2 to version 3.
if (rdbStore.version != 3 && rdbStore.version == 2) {
// version = 2: table structure: student (id, age, score) => version = 3: table structure: student (id, score)
rdbStore.executeSql("ALTER TABLE student DROP COLUMN age INTEGER", null)
rdbStore.version = 3
}
})
```
Stage model:
```ts
import data_rdb from '@ohos.data.relationalStore'
// Obtain the context.
import UIAbility from '@ohos.app.ability.UIAbility';
let context = null
import UIAbility from '@ohos.app.ability.UIAbility'
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage) {
context = this.context
const STORE_CONFIG = {
name: "rdbstore.db",
securityLevel: data_rdb.SecurityLevel.S1
}
// Assume that the current RDB store version is 3.
data_rdb.getRdbStore(this.context, STORE_CONFIG, function (err, rdbStore) {
// When an RDB store is created, the default version is 0.
if (rdbStore.version == 0) {
rdbStore.executeSql("CREATE TABLE IF NOT EXISTS student (id INTEGER PRIMARY KEY AUTOINCREMENT, score REAL);", null)
// Set the RDB store version. The input parameter must be an integer greater than 0.
rdbStore.version = 3
}
const CREATE_TABLE_TEST = "CREATE TABLE IF NOT EXISTS test (" + "id INTEGER PRIMARY KEY AUTOINCREMENT, " + "name TEXT NOT NULL, " + "age INTEGER, " + "salary REAL, " + "blobType BLOB)";
// When an app is updated to the current version, the RDB store needs to be updated from version 1 to version 2.
if (rdbStore.version != 3 && rdbStore.version == 1) {
// version = 1: table structure: student (id, age) => version = 2: table structure: student (id, age, score)
rdbStore.executeSql("ALTER TABLE student ADD COLUMN score REAL", null)
rdbStore.version = 2
}
const STORE_CONFIG = { name: "rdbstore.db",
securityLevel: data_rdb.SecurityLevel.S1}
data_rdb.getRdbStore(context, STORE_CONFIG, function (err, rdbStore) {
rdbStore.executeSql(CREATE_TABLE_TEST)
console.info('create table done.')
// When an app is updated to the current version, the RDB store needs to be updated from version 2 to version 3.
if (rdbStore.version != 3 && rdbStore.version == 2) {
// version = 2: table structure: student (id, age, score) => version = 3: table structure: student (id, score)
rdbStore.executeSql("ALTER TABLE student DROP COLUMN age INTEGER", null)
rdbStore.version = 3
}
})
}
}
```
2. Insert data.
(1) Create a **ValuesBucket** to store the data you need to insert.
(1) Create a **ValuesBucket** instance to store the data you need to insert.
(2) Call the **insert()** method to insert data into the RDB store.
......@@ -384,7 +422,6 @@ Table 15 Transaction APIs
8. Query data of a remote device.
(1) Construct a predicate object for querying distributed tables, and specify the remote distributed table name and the remote device.
(2) Call the resultSet() API to obtain the result.
......@@ -422,6 +459,7 @@ Table 15 Transaction APIs
console.info('Backup failed, err: ' + err)
})
```
(2) Restore the RDB store using the backup file.
The sample code is as follows:
......
en/application-dev/file-management/filepicker-guidelines.md
浏览文件 @ fd1b7282
......@@ -33,7 +33,7 @@ ArkTS sample code:
globalThis.context.startAbilityForResult(
{
bundleName: "com.ohos.filepicker",
abilityName: "EntryAbility",
abilityName: "MainAbility",
parameters: {
'startMode': 'choose', //choose or save
}
......@@ -45,7 +45,7 @@ globalThis.context.startAbilityForResult(
globalThis.context.startAbilityForResult(
{
bundleName: "com.ohos.filepicker",
abilityName: "EntryAbility",
abilityName: "MainAbility",
parameters: {
'startMode': 'save', //choose or save
'saveFile': 'test.jpg',
......
en/application-dev/reference/apis/js-apis-data-preferences.md
浏览文件 @ fd1b7282
......@@ -38,7 +38,7 @@ Obtains a **Preferences** instance. This API uses an asynchronous callback to re
| Name | Type | Mandatory| Description |
| -------- | ------------------------------------------------ | ---- | ------------------------------------------------------------ |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| context | Context | Yes | Application context.<br>For details about the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For details about the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance.|
| callback | AsyncCallback&lt;[Preferences](#preferences)&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is **undefined** and **object** is the **Preferences** instance obtained. Otherwise, **err** is an error code.|
......@@ -69,9 +69,11 @@ Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
import UIAbility from '@ohos.app.ability.UIAbility';
let context = null;
class MainAbility extends Ability{
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage){
context = this.context;
}
......@@ -103,7 +105,7 @@ Obtains a **Preferences** instance. This API uses a promise to return the result
| Name | Type | Mandatory| Description |
| ------- | ------------------------------------- | ---- | ----------------------- |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| context | Context | Yes | Application context.<br>For details about the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For details about the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance.|
**Return value**
......@@ -139,9 +141,11 @@ Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
import UIAbility from '@ohos.app.ability.UIAbility';
let context = null;
class MainAbility extends Ability{
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage){
context = this.context;
}
......@@ -177,7 +181,7 @@ The deleted **Preferences** instance cannot be used for data operations. Otherwi
| Name | Type | Mandatory| Description |
| -------- | ------------------------------------- | ---- | ---------------------------------------------------- |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| context | Context | Yes | Application context.<br>For details about the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For details about the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance to delete. |
| callback | AsyncCallback&lt;void&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error code.|
......@@ -215,9 +219,11 @@ Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
import UIAbility from '@ohos.app.ability.UIAbility';
let context = null;
class MainAbility extends Ability{
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage){
context = this.context;
}
......@@ -252,7 +258,7 @@ The deleted **Preferences** instance cannot be used for data operations. Otherwi
| Name | Type | Mandatory| Description |
| ------- | ------------------------------------- | ---- | ----------------------- |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| context | Context | Yes | Application context.<br>For details about the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For details about the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance to delete.|
**Return value**
......@@ -294,9 +300,11 @@ Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
import UIAbility from '@ohos.app.ability.UIAbility';
let context = null;
class MainAbility extends Ability{
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage){
context = this.context;
}
......@@ -328,7 +336,7 @@ The removed **Preferences** instance cannot be used for data operations. Otherwi
| Name | Type | Mandatory| Description |
| -------- | ------------------------------------- | ---- | ---------------------------------------------------- |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| context | Context | Yes | Application context.<br>For details about the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For details about the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance to remove. |
| callback | AsyncCallback&lt;void&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error code.|
......@@ -358,9 +366,11 @@ Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
import UIAbility from '@ohos.app.ability.UIAbility';
let context = null;
class MainAbility extends Ability{
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage){
context = this.context;
}
......@@ -394,7 +404,7 @@ The removed **Preferences** instance cannot be used for data operations. Otherwi
| Name | Type | Mandatory| Description |
| ------- | ------------------------------------- | ---- | ----------------------- |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| context | Context | Yes | Application context.<br>For details about the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For details about the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance to remove.|
**Return value**
......@@ -428,9 +438,9 @@ Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
import UIAbility from '@ohos.app.ability.UIAbility';
let context = null;
class MainAbility extends Ability{
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage){
context = this.context;
}
......
en/application-dev/reference/apis/js-apis-data-relationalStore.md
浏览文件 @ fd1b7282
......@@ -48,27 +48,22 @@ For details about the error codes, see [RDB Error Codes](../errorcodes/errorcode
FA model:
```js
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility'
// Obtain the context.
let context = featureAbility.getContext()
// Call getRdbStore.
const STORE_CONFIG = {
name: "RdbTest.db",
securityLevel: data_rdb.SecurityLevel.S1
}
data_rdb.getRdbStore(context, STORE_CONFIG, function (err, rdbStore) {
if (err) {
console.info("Failed to get RdbStore, err: " + err)
return
}
if (rdbStore.openStatus == data_rdb.OpenStatus.ON_CREATE) {
console.log("RdbStore status is ON_CREATE")
} else if (rdbStore.openStatus == data_rdb.OpenStatus.ON_OPEN) {
console.log("RdbStore status is ON_OPEN")
} else {
return
}
console.log("Got RdbStore successfully.")
})
```
......@@ -76,36 +71,24 @@ data_rdb.getRdbStore(context, STORE_CONFIG, function (err, rdbStore) {
Stage model:
```ts
// Obtain the context.
import UIAbility from '@ohos.app.ability.UIAbility';
let context;
import UIAbility from '@ohos.app.ability.UIAbility'
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage){
context = this.context
}
}
// Call getRdbStore.
const STORE_CONFIG = {
const STORE_CONFIG = {
name: "RdbTest.db",
securityLevel: data_rdb.SecurityLevel.S1
}
data_rdb.getRdbStore(context, STORE_CONFIG, function (err, rdbStore) {
}
data_rdb.getRdbStore(this.context, STORE_CONFIG, function (err, rdbStore) {
if (err) {
console.info("Failed to get RdbStore, err: " + err)
return
}
if (rdbStore.openStatus == data_rdb.OpenStatus.ON_CREATE) {
console.log("RdbStore status is ON_CREATE")
} else if (rdbStore.openStatus == data_rdb.OpenStatus.ON_OPEN) {
console.log("RdbStore status is ON_OPEN")
} else {
return
}
console.log("Got RdbStore successfully.")
})
})
}
}
```
## data_rdb.getRdbStore
......@@ -143,24 +126,18 @@ For details about the error codes, see [RDB Error Codes](../errorcodes/errorcode
FA model:
```js
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility'
// Obtain the context.
let context = featureAbility.getContext()
// Call getRdbStore.
const STORE_CONFIG = {
name: "RdbTest.db",
securityLevel: data_rdb.SecurityLevel.S1
}
let promise = data_rdb.getRdbStore(context, STORE_CONFIG);
promise.then(async (rdbStore) => {
if (rdbStore.openStatus == data_rdb.OpenStatus.ON_CREATE) {
console.log("RdbStore status is ON_CREATE")
} else if (rdbStore.openStatus == data_rdb.OpenStatus.ON_OPEN) {
console.log("RdbStore status is ON_OPEN")
} else {
return
}
console.log("Got RdbStore successfully.")
}).catch((err) => {
console.log("Failed to get RdbStore, err: " + err)
......@@ -170,35 +147,23 @@ promise.then(async (rdbStore) => {
Stage model:
```ts
// Obtain the context.
import UIAbility from '@ohos.app.ability.UIAbility';
let context;
import UIAbility from '@ohos.app.ability.UIAbility'
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage){
context = this.context
}
}
// Call getRdbStore.
const STORE_CONFIG = {
const STORE_CONFIG = {
name: "RdbTest.db",
securityLevel: data_rdb.SecurityLevel.S1
}
let promise = data_rdb.getRdbStore(context, STORE_CONFIG);
promise.then(async (rdbStore) => {
if (rdbStore.openStatus == data_rdb.OpenStatus.ON_CREATE) {
console.log("RdbStore status is ON_CREATE")
} else if (rdbStore.openStatus == data_rdb.OpenStatus.ON_OPEN) {
console.log("RdbStore status is ON_OPEN")
} else {
return
}
let promise = data_rdb.getRdbStore(this.context, STORE_CONFIG);
promise.then(async (rdbStore) => {
console.log("Got RdbStore successfully.")
}).catch((err) => {
}).catch((err) => {
console.log("Failed to get RdbStore, err: " + err)
})
})
}
}
```
## data_rdb.deleteRdbStore
......@@ -230,11 +195,11 @@ For details about the error codes, see [RDB Error Codes](../errorcodes/errorcode
FA model:
```js
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility'
// Obtain the context.
let context = featureAbility.getContext()
// Call deleteRdbStore.
data_rdb.deleteRdbStore(context, "RdbTest.db", function (err) {
if (err) {
console.info("Failed to delete RdbStore, err: " + err)
......@@ -247,25 +212,19 @@ data_rdb.deleteRdbStore(context, "RdbTest.db", function (err) {
Stage model:
```ts
// Obtain the context.
import UIAbility from '@ohos.app.ability.UIAbility';
let context;
import UIAbility from '@ohos.app.ability.UIAbility'
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage){
context = this.context
}
}
// Call deleteRdbStore.
data_rdb.deleteRdbStore(context, "RdbTest.db", function (err) {
data_rdb.deleteRdbStore(this.context, "RdbTest.db", function (err) {
if (err) {
console.info("Failed to delete RdbStore, err: " + err)
return
}
console.log("Deleted RdbStore successfully.")
})
})
}
}
```
## data_rdb.deleteRdbStore
......@@ -302,11 +261,11 @@ For details about the error codes, see [RDB Error Codes](../errorcodes/errorcode
FA model:
```js
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility'
// Obtain the context.
let context = featureAbility.getContext()
// Call deleteRdbStore.
let promise = data_rdb.deleteRdbStore(context, "RdbTest.db")
promise.then(()=>{
console.log("Deleted RdbStore successfully.")
......@@ -318,24 +277,18 @@ promise.then(()=>{
Stage model:
```ts
// Obtain the context.
import UIAbility from '@ohos.app.ability.UIAbility';
let context;
import UIAbility from '@ohos.app.ability.UIAbility'
class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage){
context = this.context
}
}
// Call deleteRdbStore.
let promise = data_rdb.deleteRdbStore(context, "RdbTest.db")
promise.then(()=>{
let promise = data_rdb.deleteRdbStore(this.context, "RdbTest.db")
promise.then(()=>{
console.log("Deleted RdbStore successfully.")
}).catch((err) => {
}).catch((err) => {
console.info("Failed to delete RdbStore, err: " + err)
})
})
}
}
```
## StoreConfig
......@@ -423,17 +376,6 @@ Defines the resolution to use when **insert()** and **update()** conflict.
| ON_CONFLICT_IGNORE | 4 | Skip the rows that contain constraint violations and continue to process the subsequent rows of the SQL statement.|
| ON_CONFLICT_REPLACE | 5 | Delete pre-existing rows that cause the constraint violation before inserting or updating the current row, and continue to execute the command normally.|
## OpenStatus<sup>10+</sup>
Enumerates the RDB store status.
**System capability**: SystemCapability.DistributedDataManager.RelationalStore.Core
| Name | Value | Description |
| --------- | ---- | --------------------------------------------------- |
| ON_CREATE | 0 | The RDB store is created for the first time. |
| ON_OPEN | 1 | The RDB store is already created. |
## RdbPredicates
Defines the predicates for an RDB store. This class determines whether the conditional expression for the RDB store is true or false.
......@@ -1283,7 +1225,16 @@ Before using the following APIs, use [executeSql](#executesql) to initialize the
| Name | Type | Mandatory| Description |
| ------------ | ----------- | ---- | -------------------------------- |
| openStatus<sup>10+</sup> | number | Yes | RDB store status. The value **0** indicates the **ON_CREATE** state, which means the RDB store is created for the first time. The value **1** indicates the **ON_OPEN** state, which means the RDB store is already created. |
| version<sup>10+</sup> | number | Yes | RDB store version, which is an integer greater than 0. |
**Example**
```js
// Set the RDB store version.
rdbStore.version = 3
// Obtain the RDB store version.
console.info("Get RdbStore version is " + rdbStore.version)
```
### insert
......
Markdown is supported
0% 或 .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑！
想要评论请 注册 或