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2362c9ed
编写于
2月 01, 2023
作者:
O
openharmony_ci
提交者:
Gitee
2月 01, 2023
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差异文件
!13453 添加数据库升级场景示例
Merge pull request !13453 from LeiiYB/master
上级
5a381350
66d37350
变更
2
显示空白变更内容
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并排
Showing
2 changed file
with
134 addition
and
145 deletion
+134
-145
zh-cn/application-dev/database/database-relational-guidelines.md
...pplication-dev/database/database-relational-guidelines.md
+73
-35
zh-cn/application-dev/reference/apis/js-apis-data-relationalStore.md
...cation-dev/reference/apis/js-apis-data-relationalStore.md
+61
-110
未找到文件。
zh-cn/application-dev/database/database-relational-guidelines.md
浏览文件 @
2362c9ed
...
...
@@ -202,39 +202,77 @@
```js
import data_rdb from '@ohos.data.relationalStore'
// 获取context
import featureAbility from '@ohos.ability.featureAbility'
// 获取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}
// 假设当前数据库版本为3
data_rdb.getRdbStore(context, STORE_CONFIG, function (err, rdbStore) {
rdbStore.executeSql(CREATE_TABLE_TEST)
console.info('create table done.')
// 当数据库创建时,数据库默认版本为0
if (rdbStore.version == 0) {
rdbStore.executeSql("CREATE TABLE IF NOT EXISTS student (id INTEGER PRIMARY KEY AUTOINCREMENT, score REAL);", null)
// 设置数据库的版本,入参为大于0的整数
rdbStore.version = 3
}
// 当数据库存在并假定版本为1时,例应用从某一版本升级到当前版本,数据库需要从1版本升级到2版本
if (rdbStore.version != 3 && rdbStore.version == 1) {
// version = 1:表结构:student (id, age) => version = 2:表结构:student (id, age, score)
rdbStore.executeSql("ALTER TABLE student ADD COLUMN score REAL", null)
rdbStore.version = 2
}
// 当数据库存在并假定版本为2时,例应用从某一版本升级到当前版本,数据库需要从2版本升级到3版本
if (rdbStore.version != 3 && rdbStore.version == 2) {
// version = 2:表结构:student (id, age, score) => version = 3:表结构:student (id, score)
rdbStore.executeSql("ALTER TABLE student DROP COLUMN age INTEGER", null)
rdbStore.version = 3
}
})
```
Stage模型示例:
```ts
import data_rdb from '@ohos.data.relationalStore'
// 获取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
}
// 假设当前数据库版本为3
data_rdb.getRdbStore(this.context, STORE_CONFIG, function (err, rdbStore) {
// 当数据库创建时,数据库默认版本为0
if (rdbStore.version == 0) {
rdbStore.executeSql("CREATE TABLE IF NOT EXISTS student (id INTEGER PRIMARY KEY AUTOINCREMENT, score REAL);", null)
// 设置数据库的版本,入参为大于0的整数
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)";
// 当数据库存在并假定版本为1时,例应用从某一版本升级到当前版本,数据库需要从1版本升级到2版本
if (rdbStore.version != 3 && rdbStore.version == 1) {
// version = 1:表结构:student (id, age) => version = 2:表结构: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.')
// 当数据库存在并假定版本为2时,例应用从某一版本升级到当前版本,数据库需要从2版本升级到3版本
if (rdbStore.version != 3 && rdbStore.version == 2) {
// version = 2:表结构:student (id, age, score) => version = 3:表结构:student (id, score)
rdbStore.executeSql("ALTER TABLE student DROP COLUMN age INTEGER", null)
rdbStore.version = 3
}
})
}
}
```
2. 插入数据。
...
...
@@ -384,7 +422,6 @@
8. 远程查询。
(1) 构造用于查询分布式表的谓词对象,指定组网内的远程分布式表名和设备。
(2) 调用结果集接口,返回查询结果。
...
...
@@ -422,6 +459,7 @@
console.info('Backup failed, err: ' + err)
})
```
(2) 调用数据库的恢复接口,从数据库的备份文件恢复数据库文件。
示例代码如下:
...
...
zh-cn/application-dev/reference/apis/js-apis-data-relationalStore.md
浏览文件 @
2362c9ed
...
...
@@ -48,27 +48,22 @@ getRdbStore(context: Context, config: StoreConfig, callback: AsyncCallback<Rd
FA模型示例:
```
js
// 获取context
import
featureAbility
from
'
@ohos.ability.featureAbility
'
// 获取context
let
context
=
featureAbility
.
getContext
()
// 获取context后调用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
(
"
Get RdbStore failed, 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
(
"
Get RdbStore successfully.
"
)
})
```
...
...
@@ -76,36 +71,24 @@ data_rdb.getRdbStore(context, STORE_CONFIG, function (err, rdbStore) {
Stage模型示例:
```
ts
// 获取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
}
}
// 获取context后调用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
(
"
Get RdbStore failed, 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
(
"
Get RdbStore successfully.
"
)
})
})
}
}
```
## data_rdb.getRdbStore
...
...
@@ -143,24 +126,18 @@ getRdbStore(context: Context, config: StoreConfig): Promise<RdbStore>
FA模型示例:
```
js
// 获取context
import
featureAbility
from
'
@ohos.ability.featureAbility
'
// 获取context
let
context
=
featureAbility
.
getContext
()
// 获取context后调用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
(
"
Get RdbStore successfully.
"
)
}).
catch
((
err
)
=>
{
console
.
log
(
"
Get RdbStore failed, err:
"
+
err
)
...
...
@@ -170,35 +147,23 @@ promise.then(async (rdbStore) => {
Stage模型示例:
```
ts
// 获取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
}
}
// 获取context后调用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
(
"
Get RdbStore successfully.
"
)
}).
catch
((
err
)
=>
{
}).
catch
((
err
)
=>
{
console
.
log
(
"
Get RdbStore failed, err:
"
+
err
)
})
})
}
}
```
## data_rdb.deleteRdbStore
...
...
@@ -230,11 +195,11 @@ deleteRdbStore(context: Context, name: string, callback: AsyncCallback<void&g
FA模型示例:
```
js
// 获取context
import
featureAbility
from
'
@ohos.ability.featureAbility
'
// 获取context
let
context
=
featureAbility
.
getContext
()
// 获取context后调用deleteRdbStore
data_rdb
.
deleteRdbStore
(
context
,
"
RdbTest.db
"
,
function
(
err
)
{
if
(
err
)
{
console
.
info
(
"
Delete RdbStore failed, err:
"
+
err
)
...
...
@@ -247,25 +212,19 @@ data_rdb.deleteRdbStore(context, "RdbTest.db", function (err) {
Stage模型示例:
```
ts
// 获取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
}
}
// 获取context后调用deleteRdbStore
data_rdb
.
deleteRdbStore
(
context
,
"
RdbTest.db
"
,
function
(
err
)
{
data_rdb
.
deleteRdbStore
(
this
.
context
,
"
RdbTest.db
"
,
function
(
err
)
{
if
(
err
)
{
console
.
info
(
"
Delete RdbStore failed, err:
"
+
err
)
return
}
console
.
log
(
"
Delete RdbStore successfully.
"
)
})
})
}
}
```
## data_rdb.deleteRdbStore
...
...
@@ -302,11 +261,11 @@ deleteRdbStore(context: Context, name: string): Promise<void>
FA模型示例:
```
js
// 获取context
import
featureAbility
from
'
@ohos.ability.featureAbility
'
// 获取context
let
context
=
featureAbility
.
getContext
()
// 获取context后调用deleteRdbStore
let
promise
=
data_rdb
.
deleteRdbStore
(
context
,
"
RdbTest.db
"
)
promise
.
then
(()
=>
{
console
.
log
(
"
Delete RdbStore successfully.
"
)
...
...
@@ -318,24 +277,18 @@ promise.then(()=>{
Stage模型示例:
```
ts
// 获取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
}
}
// 获取context后调用deleteRdbStore
let
promise
=
data_rdb
.
deleteRdbStore
(
context
,
"
RdbTest.db
"
)
promise
.
then
(()
=>
{
let
promise
=
data_rdb
.
deleteRdbStore
(
this
.
context
,
"
RdbTest.db
"
)
promise
.
then
(()
=>
{
console
.
log
(
"
Delete RdbStore successfully.
"
)
}).
catch
((
err
)
=>
{
}).
catch
((
err
)
=>
{
console
.
info
(
"
Delete RdbStore failed, err:
"
+
err
)
})
})
}
}
```
## StoreConfig
...
...
@@ -423,17 +376,6 @@ promise.then(()=>{
| ON_CONFLICT_IGNORE | 4 | 表示当冲突发生时,跳过包含违反约束的行并继续处理 SQL 语句的后续行。 |
| ON_CONFLICT_REPLACE | 5 | 表示当冲突发生时,在插入或更新当前行之前删除导致约束违例的预先存在的行,并且命令会继续正常执行。 |
## OpenStatus<sup>10+</sup>
RdbStore的状态枚举。
**系统能力:**
SystemCapability.DistributedDataManager.RelationalStore.Core
| 名称 | 值 | 说明 |
| --------- | ---- | --------------------------------------------------- |
| ON_CREATE | 0 | 表示RdbStore首次创建,处于ON_CREATE状态。 |
| ON_OPEN | 1 | 表示RdbStore非首次创建,处于ON_OPEN状态。 |
## RdbPredicates
表示关系型数据库(RDB)的谓词。该类确定RDB中条件表达式的值是true还是false。
...
...
@@ -1283,7 +1225,16 @@ predicates.notIn("NAME", ["Lisa", "Rose"])
| 名称 | 类型 | 必填 | 说明 |
| ------------ | ----------- | ---- | -------------------------------- |
| openStatus
<sup>
10+
</sup>
| number | 是 | RdbStore的状态。值为0时,表示RdbStore首次创建,处于ON_CREATE状态。值为1时,表示RdbStore非首次创建,处于ON_OPEN状态。 |
| version
<sup>
10+
</sup>
| number | 是 | 设置和获取数据库版本,值为大于0的正整数。 |
**示例:**
```
js
// 设置数据库版本
rdbStore
.
version
=
3
// 获取数据库版本
console
.
info
(
"
Get RdbStore version is
"
+
rdbStore
.
version
)
```
### insert
...
...
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