从API Version 9开始,鸿蒙开发中sqlite使用新接口@ohos.data.relationalStore
但是 relationalStore在 getRdbStore操作时,在预览模式运行或者远程模拟器运行都会报错,导致无法使用。查了一圈说只有在真机上可以正常使用,因此这里暂且使用 @ohos.data.rdb
二者的接口非常相似,会使用了ohos.data.rdb,自然也会使用ohos.data.relationalStore
在harmonyos开发中,操作数据库时,我们通常习惯将一个功能模块数据库操作全部写在一个ets文件中并export,在界面文件中直接导入使用。
1.数据库配置以及建表
新建userDb.ets文件并添加以下代码
import data_rdb from '@ohos.data.rdb'
const STORE_CONFIG = {name: "test.db"}
const TAB_USER = "user"
const CREATE_TABLE_CODE = "CREATE TABLE IF NOT EXISTS "+TAB_USER+" ("
+ "id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ "name TEXT , "
+ "age TEXT , "
+ "sex TEXT ) "
export function createTable(context) {
data_rdb.getRdbStore(context,STORE_CONFIG, 1, function (err, rdbStore) {
rdbStore.executeSql(CREATE_TABLE_CODE)
console.info('create table done.')
})
}
在User.ets界面导入并调用
import {createTable} from '../utils/userDb'
aboutToAppear() {
createTable(getContext(this))
}
2.插入数据
userDb.ets文件添加 insertData方法,这里需要注意的是promise的用法,因为需要将执行结果返回界面,所以方法里面多次使用了Promise来返回结果
插入的字段要和数据库字段保持一致。
export function insertData(context,list):any{
const promise = data_rdb.getRdbStore(context,STORE_CONFIG, 1)
return promise.then(async (rdbStore) => {
let arr:any = [];
for(let i:number=0; i<list.length; i++){
const obj = list[i]
const item ={
name: obj.name,
age: obj.age,
sex: obj.sex
}
rdbStore.insert(TAB_USER, item);
}
console.log('--start')
console.log('完了')
return true;
})
}
在User.ets界面导入并调用
import {insertData} from '../utils/userDb'
addData(){
let array = [];
for(let i=0; i<20; i++){
array.push({
name:'张飞'+i,
age: 20+i,
sex: '男'
})
}
insertData(getContext(this), array)
.then(res=>{
if(res){
this.loading = false
this.showDialog('添加成功')
this.search(true)
}
})
}
3.查询
userDb.ets文件添加 queryDataPage方法,这里用了分页查询的方式,还有一种谓词的查询方式请参考官方文档。
export function queryDataPage(context,param):any {
let promise = data_rdb.getRdbStore(context, STORE_CONFIG, 1)
return promise.then(async (rdbStore) => {
const sql: string = "select * from "+TAB_USER+" where name like ? " +
"order by id asc limit ? OFFSET ? ";
console.log('----sql---', sql)
const pS = param.pageSize
const page = param.page
console.log('param.code', param.code)
console.log('pS', pS)
console.log('(page-1)*pS', (page - 1) * pS)
// param.code,pS,(page-1)*pS]
let promisequery = rdbStore.querySql(sql, [param.code, pS, (page - 1) * pS])
return promisequery.then(async (resultSet) => {
const rowCount = resultSet.rowCount;
let list = [];
console.log("rowCount --" + rowCount)
resultSet.goToFirstRow();
for (let i = 0; i < rowCount; i++) {
const name = resultSet.getString(resultSet.getColumnIndex("NAME"))
const age = resultSet.getString(resultSet.getColumnIndex("AGE"))
const sex = resultSet.getString(resultSet.getColumnIndex("SEX"))
const id = resultSet.getString(resultSet.getColumnIndex("ID"))
resultSet.goToNextRow();
const data = {
name,
id,
age,
sex,
}
list.push(data);
}
resultSet.close();
console.log('--array--', list.length)
return list;
})
}).catch((err) => {
console.log("Get RdbStore failed, err: " + err)
})
}
在User.ets界面导入并调用
import {queryDataPage} from '../utils/userDb'
@State list:Array<any> = []
@State keyword:string = ""
@State page:number = 1
@State pageSize:number = 20
search(firstPage:boolean){
if(firstPage){
this.page = 1
}
const params = {
code: '%'+this.keyword+'%',
page: this.page,
pageSize: this.pageSize,
}
queryDataPage(getContext(this), params)
.then(data=>{
if(data){
console.log('res',JSON.stringify(data));
if(this.page == 1){
this.list = data
} else {
this.list = this.list.concat(data);
}
}
})
}
4.更新数据
userDb.ets文件添加 updateData方法
export function updateData(context,newInfo):any{
const promise = data_rdb.getRdbStore(context,STORE_CONFIG, 1)
return promise.then(async (rdbStore) => {
let predicates = new data_rdb.RdbPredicates(TAB_USER);
predicates.equalTo("id", newInfo.id)
let promiseUp = rdbStore.update(newInfo, predicates)
return promiseUp.then(async (rows) => {
if(rows == 1){
return true
}
}).catch((err) => {
console.info("Updated failed, err: " + err)
return false
})
})
}
在User.ets界面导入并调用
import {updateData} from '../utils/userDb'
updateOne(item:any){
item.name = '张飞111'
updateData(getContext(this), item)
.then(res=>{
if(res){
this.showDialog('更新成功')
this.search(true)
}
})
}
5.删除数据
userDb.ets文件添加 deleteOneData方法
export function deteteOneData(context,id):any{
const promise = data_rdb.getRdbStore(context,STORE_CONFIG, 1)
return promise.then(async (rdbStore) => {
let predicates = new data_rdb.RdbPredicates(TAB_USER);
predicates.equalTo("id", id)
const result = rdbStore.delete(predicates);
console.log('--result--'+JSON.stringify(result))
return true;
})
}
在User.ets界面导入并调用
import {deteteOneData} from '../utils/userDb'
deleteOne(id:string){
deteteOneData(getContext(this), id)
.then(res=>{
if(res){
this.showDialog('删除成功')
this.search(true)
}
})
}
6.界面效果
点击右上角Add按钮,插入数据;
点击删除按钮,删除一条数据;
点击编辑按钮,将该条数据姓名字段更新为 马超000。
7.完整代码
界面文件 User.ets文章来源:https://www.toymoban.com/news/detail-797156.html
import {createTable,insertData,
deteteOneData,updateData,
queryDataPage} from '../utils/userDb'
@Entry
@Component
struct User {
controller: SearchController = new SearchController()
@State codeList:Array<any> = [];
@State list:Array<any> = [];
@State loading:boolean = false;
@State keyword:string = "";
@State page:number = 1;
@State pageSize:number = 20;
aboutToAppear() {
createTable(getContext(this))
}
onReachEnd(){
console.log('--------onReachEnd---');
//this.page = this.page+1
this.search(false)
}
search(firstPage:boolean){
if(firstPage){
this.page = 1
}
const params = {
code: '%'+this.keyword+'%',
page: this.page,
pageSize: this.pageSize,
}
queryDataPage(getContext(this), params)
.then(data=>{
if(data){
console.log('res',JSON.stringify(data));
if(this.page == 1){
this.list = data
} else {
this.list = this.list.concat(data);
}
}
})
}
addData(){
let array = [];
for(let i=0; i<20; i++){
array.push({
name:'张飞'+i,
age: 20+i,
sex: '男'
})
}
insertData(getContext(this), array)
.then(res=>{
if(res){
this.loading = false
this.showDialog('添加成功')
this.search(true)
}
})
}
deleteOne(id:string){
deteteOneData(getContext(this), id)
.then(res=>{
if(res){
this.showDialog('删除成功')
this.search(true)
}
})
}
updateOne(item:any){
item.name = '马超000'
updateData(getContext(this), item)
.then(res=>{
if(res){
this.showDialog('更新成功')
this.search(true)
}
})
}
showDialog(text:string){
AlertDialog.show(
{
title: '提示',
message: text,
autoCancel: true,
alignment: DialogAlignment.Center,
gridCount: 4,
offset: { dx: 0, dy: -20 },
primaryButton: {
value: '确定',
action: () => {
console.info('Callback when the first button is clicked')
}
},
}
)
}
toAddData(){
AlertDialog.show(
{
title: '提示',
message: '确定要添加数据吗',
autoCancel: true,
alignment: DialogAlignment.Center,
offset: { dx: 0, dy: -20 },
gridCount: 5,
primaryButton: {
value: '确定',
action: () => {
console.info('确定 is clicked')
this.loading = true
this.addData()
}
},
secondaryButton: {
value: '取消',
action: () => {
console.info('取消 is clicked')
}
},
cancel: () => {
console.info('Closed callbacks')
}
}
)
}
@Builder NavigationMenus() {
Row() {
Text("Add")
.width(32)
.height(28)
.onClick(()=>this.toAddData())
}
}
@Builder buildList(){
Row(){
Text('姓名')
Text('年龄')
Text('性别')
Text('操作')
}.justifyContent(FlexAlign.SpaceAround)
.width('100%')
.padding({top:5,bottom: 10})
List({ space: 20, initialIndex: 0 }) {
ForEach(this.list, (item) => {
ListItem() {
Row(){
Text(item.name)
Text(item.age)
Text(item.sex)
Row(){
Text('删除').onClick(()=>{
this.deleteOne(item.id)
}).fontColor(Color.Red)
.margin({right:5})
Text('编辑').onClick(()=>{
this.updateOne(item)
}).fontColor(Color.Blue)
}
}
.justifyContent(FlexAlign.SpaceAround)
.width('100%')
}.editable(true)
}, item => item.name)
}
.onScrollIndex((firstIndex: number, lastIndex: number) => {
//console.info('first' + firstIndex)
//console.info('last' + lastIndex)
})
.onReachEnd(()=>{
this.onReachEnd()
})
.listDirection(Axis.Vertical) // 排列方向
.divider({ strokeWidth: 2, color: 0xFFFFFF, startMargin: 20, endMargin: 20 }) // 每行之间的分界线
.edgeEffect(EdgeEffect.None) // 滑动到边缘无效果
.chainAnimation(false) // 联动特效关闭
.width('100%')
}
@Builder buildSearch(){
Search({ value: this.keyword, placeholder: '请输入姓名...', controller: this.controller })
.searchButton('搜索')
.width('100%')
.height(40)
.backgroundColor('#F5F5F5')
.placeholderColor(Color.Grey)
.placeholderFont({ size: 14, weight: 400 })
.textFont({ size: 14, weight: 400 })
.onSubmit((value: string) => {
console.log('---999')
//this.submitValue = value
this.keyword = value
this.search(true)
})
.onChange((value: string) => {
this.keyword = value
})
}
build() {
Column(){
Navigation() {
Column(){
this.buildSearch()
if(this.loading){
Column(){
LoadingProgress()
.color(Color.Blue)
}
.width('40%').height('40%')
}
this.buildList()
}.height('100%')
}
.title("用户管理")
.menus(this.NavigationMenus)
.titleMode(NavigationTitleMode.Mini)
}
.height('100%')
}
}
数据操作文件 userDb.ets文章来源地址https://www.toymoban.com/news/detail-797156.html
import data_rdb from '@ohos.data.rdb'
const STORE_CONFIG = {name: "test.db"}
const TAB_USER = "user"
const CREATE_TABLE_CODE = "CREATE TABLE IF NOT EXISTS "+TAB_USER+" ("
+ "id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ "name TEXT , "
+ "age TEXT , "
+ "sex TEXT ) "
export function createTable(context) {
data_rdb.getRdbStore(context,STORE_CONFIG, 1, function (err, rdbStore) {
rdbStore.executeSql(CREATE_TABLE_CODE)
console.info('create table done.')
})
}
export function updateData(context,newInfo):any{
const promise = data_rdb.getRdbStore(context,STORE_CONFIG, 1)
return promise.then(async (rdbStore) => {
let predicates = new data_rdb.RdbPredicates(TAB_USER);
predicates.equalTo("id", newInfo.id)
let promiseUp = rdbStore.update(newInfo, predicates)
return promiseUp.then(async (rows) => {
if(rows == 1){
return true
}
}).catch((err) => {
console.info("Updated failed, err: " + err)
return false
})
})
}
export function insertData(context,list):any{
const promise = data_rdb.getRdbStore(context,STORE_CONFIG, 1)
return promise.then(async (rdbStore) => {
let arr:any = [];
for(let i:number=0; i<list.length; i++){
const obj = list[i]
const item ={
name: obj.name,
age: obj.age,
sex: obj.sex
}
rdbStore.insert(TAB_USER, item);
}
console.log('--start')
console.log('完了')
return true;
})
}
export function deteteOneData(context,id):any{
const promise = data_rdb.getRdbStore(context,STORE_CONFIG, 1)
return promise.then(async (rdbStore) => {
let predicates = new data_rdb.RdbPredicates(TAB_USER);
predicates.equalTo("id", id)
const result = rdbStore.delete(predicates);
console.log('--result--'+JSON.stringify(result))
return true;
})
}
export function detelteAllCode(context){
data_rdb.getRdbStore(context,STORE_CONFIG, 1, function (err, rdbStore) {
rdbStore.executeSql("delete from "+TAB_USER)
console.info('--delete code done.')
})
}
export function queryDataPage(context,param):any {
let promise = data_rdb.getRdbStore(context, STORE_CONFIG, 1)
return promise.then(async (rdbStore) => {
const sql: string = "select * from "+TAB_USER+" where name like ? " +
"order by id asc limit ? OFFSET ? ";
console.log('----sql---', sql)
const pS = param.pageSize
const page = param.page
console.log('param.code', param.code)
console.log('pS', pS)
console.log('(page-1)*pS', (page - 1) * pS)
// param.code,pS,(page-1)*pS]
let promisequery = rdbStore.querySql(sql, [param.code, pS, (page - 1) * pS])
return promisequery.then(async (resultSet) => {
const rowCount = resultSet.rowCount;
let list = [];
console.log("rowCount --" + rowCount)
resultSet.goToFirstRow();
for (let i = 0; i < rowCount; i++) {
const name = resultSet.getString(resultSet.getColumnIndex("NAME"))
const age = resultSet.getString(resultSet.getColumnIndex("AGE"))
const sex = resultSet.getString(resultSet.getColumnIndex("SEX"))
const id = resultSet.getString(resultSet.getColumnIndex("ID"))
resultSet.goToNextRow();
const data = {
name,
id,
age,
sex,
}
list.push(data);
}
resultSet.close();
console.log('--array--', list.length)
return list;
})
}).catch((err) => {
console.log("Get RdbStore failed, err: " + err)
})
}
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