Sqlite 在SQLlite颤振中单击按钮时如何显示当前日期时间?
我想添加一个新的列包含当前日期时添加新的名称,这是我的代码有帮助吗? 此类用于添加名称Sqlite 在SQLlite颤振中单击按钮时如何显示当前日期时间?,sqlite,flutter,dart,Sqlite,Flutter,Dart,我想添加一个新的列包含当前日期时添加新的名称,这是我的代码有帮助吗? 此类用于添加名称 class Employee { int id; String name; Employee(this.id, this.name); Map<String, dynamic> toMap() { var map = <String, dynamic>{ 'id': id, 'name': name, }; retur
class Employee {
int id;
String name;
Employee(this.id, this.name);
Map<String, dynamic> toMap() {
var map = <String, dynamic>{
'id': id,
'name': name,
};
return map;
}
Employee.fromMap(Map<String, dynamic> map) {
id = map['id'];
name = map['name'];
}
}
class员工{
int-id;
字符串名;
员工(this.id,this.name);
映射toMap(){
变量映射={
“id”:id,
“名称”:名称,
};
返回图;
}
Employee.fromMap(地图地图){
id=map['id'];
name=map['name'];
}
}
这是我用来存储名称并显示delete按钮的数据库。在添加新名称时,如何在此处添加一个包含当前日期和时间的新列
strong文本
Future<List<Employee>> employees;
TextEditingController controller = TextEditingController();
String name;
int curUserId;
final formKey = new GlobalKey<FormState>();
var dbHelper;
bool isUpdating;
@override
void initState() {
super.initState();
dbHelper = DBHelper();
isUpdating = false;
refreshList();
}
refreshList() {
setState(() {
employees = dbHelper.getEmployees();
});
}
clearName() {
controller.text = '';
}
validate() {
if (formKey.currentState.validate()) {
formKey.currentState.save();
if (isUpdating) {
Employee e = Employee(curUserId, name);
dbHelper.update(e);
setState(() {
isUpdating = false;
});
} else {
Employee e = Employee(null, name);
dbHelper.save(e);
}
clearName();
refreshList();
}
}
form() {
return Form(
key: formKey,
child: Padding(
padding: EdgeInsets.all(15.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
verticalDirection: VerticalDirection.down,
children: <Widget>[
TextFormField(
controller: controller,
keyboardType: TextInputType.text,
decoration: InputDecoration(labelText: 'Name'),
validator: (val) => val.length == 0 ? 'Enter Name' : null,
onSaved: (val) => name = val,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
FlatButton(
onPressed: validate,
child: Text(isUpdating ? 'UPDATE' : 'ADD'),
),
FlatButton(
onPressed: () {
setState(() {
isUpdating = false;
});
clearName();
},
child: Text('CANCEL'),
)
],
),
],
),
),
);
}
SingleChildScrollView dataTable(List<Employee> employees) {
return SingleChildScrollView(
scrollDirection: Axis.vertical,
child: DataTable(
columns: [
DataColumn(
label: Text('NAME'),
),
DataColumn(
label: Text('DELETE'),
),
// DataColumn(label: Text("")'null')
],
rows: employees
.map(
(employee) => DataRow(cells: [
DataCell(
Text(employee.name),
onTap: () {
setState(() {
isUpdating = true;
curUserId = employee.id;
});
controller.text = employee.name;
},
),
DataCell(IconButton(
icon: Icon(Icons.delete),
onPressed: () {
dbHelper.delete(employee.id);
refreshList();
},
)),
]),
)
.toList(),
),
);
}
list() {
return Expanded(
child: FutureBuilder(
future: employees,
builder: (context, snapshot) {
if (snapshot.hasData) {
return dataTable(snapshot.data);
}
if (null == snapshot.data || snapshot.data.length == 0) {
return Text("No Data Found");
}
return CircularProgressIndicator();
},
),
);
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Stay_Safe'),
centerTitle: true
),
body: new Container(
child: new Column(
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
verticalDirection: VerticalDirection.down,
children: <Widget>[
form(),
list(),
],
),
),
);
}
}
未来雇员;
TextEditingController=TextEditingController();
字符串名;
int curUserId;
final formKey=new GlobalKey();
var-dbHelper;
布尔正在更新;
@凌驾
void initState(){
super.initState();
dbHelper=dbHelper();
isUpdating=false;
刷新列表();
}
刷新列表(){
设置状态(){
employees=dbHelper.getEmployees();
});
}
clearName(){
controller.text='';
}
验证(){
if(formKey.currentState.validate()){
formKey.currentState.save();
如果(正在更新){
员工e=员工(curUserId,姓名);
dbHelper.update(e);
设置状态(){
isUpdating=false;
});
}否则{
员工e=员工(空,姓名);
dbHelper.save(e);
}
clearName();
刷新列表();
}
}
表格({
报税表(
key:formKey,
孩子:填充(
填充:所有边缘设置(15.0),
子:列(
mainAxisAlignment:mainAxisAlignment.center,
mainAxisSize:mainAxisSize.min,
垂直方向:垂直方向。向下,
儿童:[
TextFormField(
控制器:控制器,
键盘类型:TextInputType.text,
装饰:输入装饰(标签文本:“名称”),
验证程序:(val)=>val.length==0?“输入名称”:null,
onSaved:(val)=>name=val,
),
划船(
mainAxisAlignment:mainAxisAlignment.space,
儿童:[
扁平按钮(
onPressed:validate,
子项:文本(正在更新?'UPDATE':'ADD'),
),
扁平按钮(
已按下:(){
设置状态(){
isUpdating=false;
});
clearName();
},
子项:文本('CANCEL'),
)
],
),
],
),
),
);
}
SingleChildScrollView数据表(列出员工){
返回SingleChildScrollView(
滚动方向:轴垂直,
子:数据表(
栏目:[
数据列(
标签:文本(“名称”),
),
数据列(
标签:文本(“删除”),
),
//DataColumn(标签:文本(“”'null'))
],
行:员工
.地图(
(员工)=>数据行(单元格:[
数据单元(
文本(雇员姓名),
onTap:(){
设置状态(){
isUpdating=true;
curUserId=employee.id;
});
controller.text=employee.name;
},
),
数据单元(图标按钮(
图标:图标(Icons.delete),
已按下:(){
dbHelper.delete(employee.id);
刷新列表();
},
)),
]),
)
.toList(),
),
);
}
列表(){
扩大回报(
孩子:未来建设者(
未来:员工,
生成器:(上下文,快照){
if(snapshot.hasData){
返回数据表(snapshot.data);
}
if(null==snapshot.data | | snapshot.data.length==0){
返回文本(“未找到数据”);
}
返回循环ProgressIndicator();
},
),
);
}
@凌驾
小部件构建(构建上下文){
归还新脚手架(
appBar:新的appBar(
标题:新文本(“保持安全”),
标题:正确
),
主体:新容器(
子:新列(
mainAxisAlignment:mainAxisAlignment.start,
mainAxisSize:mainAxisSize.min,
垂直方向:垂直方向。向下,
儿童:[
form(),
列表(),
],
),
),
);
}
}
将日期时间添加到员工模型:
class Employee {
int id;
String name;
DateTime dateTime;
Employee(this.id, this.name, this.dateTime);
Map<String, dynamic> toMap() {
final Map<String, dynamic> map = new Map<String, dynamic>();
map['id'] = this.id;
map['name'] = this.name;
map['dateTime'] = dateTime != null ? this.dateTime.toIso8601String() : '';
return map;
}
Employee.fromMap(Map<String, dynamic> map) {
id = map['id'];
name = map['name'];
dateTime = map['dateTime'] != null? DateTime.parse(map['dateTime']): null;
}
}
class员工{
int-id;
字符串名;
日期时间日期时间;
员工(this.id、this.name、this.dateTime);
映射toMap(){
最终地图=新地图();
map['id']=this.id;
map['name']=this.name;
map['dateTime']=dateTime!=null?this.dateTime.toIso8601String():'';
返回图;
}
Employee.fromMap(地图地图){
id=map['id'];
name=map['name'];
dateTime=map['dateTime']!=null?dateTime.parse(map['dateTime']):null;
}
}
DateTime.now()返回用户当前的DateTime。每当用户更新或添加新数据时,我们都会传递此消息。我们将创建另一个数据列和单元格来显示时间。DateTime需要转换为可呈现的字符串,因此我们将使用自定义函数getFormattedDate,最后在文本小部件中显示它
Future<List<Employee>> employees;
TextEditingController controller = TextEditingController();
String name;
int curUserId;
final formKey = new GlobalKey<FormState>();
var dbHelper;
bool isUpdating;
@override
void initState() {
super.initState();
dbHelper = DBHelper();
isUpdating = false;
refreshList();
}
refreshList() {
setState(() {
employees = dbHelper.getEmployees();
});
}
clearName() {
controller.text = '';
}
validate() {
if (formKey.currentState.validate()) {
formKey.currentState.save();
if (isUpdating) {
Employee e = Employee(curUserId, name,DateTime.now());
dbHelper.update(e);
setState(() {
isUpdating = false;
});
} else {
Employee e = Employee(null, name,DateTime.now());
dbHelper.save(e);
}
clearName();
refreshList();
}
}
form() {
return Form(
key: formKey,
child: Padding(
padding: EdgeInsets.all(15.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
verticalDirection: VerticalDirection.down,
children: <Widget>[
TextFormField(
controller: controller,
keyboardType: TextInputType.text,
decoration: InputDecoration(labelText: 'Name'),
validator: (val) => val.length == 0 ? 'Enter Name' : null,
onSaved: (val) => name = val,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
FlatButton(
onPressed: validate,
child: Text(isUpdating ? 'UPDATE' : 'ADD'),
),
FlatButton(
onPressed: () {
setState(() {
isUpdating = false;
});
clearName();
},
child: Text('CANCEL'),
)
],
),
],
),
),
);
}
SingleChildScrollView dataTable(List<Employee> employees) {
return SingleChildScrollView(
scrollDirection: Axis.vertical,
child: DataTable(
columns: [
DataColumn(
label: Text('NAME'),
),
DataColumn(
label: Text('DELETE'),
),
DataColumn(
label: Text('DATE'),
),
// DataColumn(label: Text("")'null')
],
rows: employees
.map(
(employee) => DataRow(cells: [
DataCell(
Text(employee.name),
onTap: () {
setState(() {
isUpdating = true;
curUserId = employee.id;
});
controller.text = employee.name;
},
),
DataCell(IconButton(
icon: Icon(Icons.delete),
onPressed: () {
dbHelper.delete(employee.id);
refreshList();
},
)),
DataCell(
Text(((DateTime date) =>
"${date.hour % 12}:${date.minute} ${date.hour > 12
? 'PM'
: 'AM'}")(
employee.dateTime) + ' ${getFormattedDate(employee.dateTime.toIso8601String())}'),
onTap: () {
//Any action
},
),
]),
)
.toList(),
),
);
}
list() {
return Expanded(
child: FutureBuilder(
future: employees,
builder: (context, snapshot) {
if (snapshot.hasData) {
return dataTable(snapshot.data);
}
if (null == snapshot.data || snapshot.data.length == 0) {
return Text("No Data Found");
}
return CircularProgressIndicator();
},
),
);
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Stay_Safe'),
centerTitle: true
),
body: new Container(
child: new Column(
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
verticalDirection: VerticalDirection.down,
children: <Widget>[
form(),
list(),
],
),
),
);
}
String getFormattedDate(String date) {
var d = DateTime.parse(date);
return [
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec"
][d.month - 1] +
" " + d.day.toString() +
"," +
d.year.toString();
}
未来员工;
TextEditingController=TextEditingController();
字符串名;
int curUserId;
final formKey=new GlobalKey();
var-dbHelper;
布尔正在更新;
@凌驾
void initState(){
super.initState();
dbHelper=DBHelp