Question

是否可以使用sql访问连接我的查询中的字段（使用excel查询）。

我目前的查询是：

 Select *
 FROM [table$]

但是如何添加一个连接colA&"|"&colB&"|"&colC&"|"&colD

的新字段

感谢。

Answer 1

你似乎理解了这个表达;只需将其添加到select t.*, (t.colA & "|" & t.colB & "|" & t.colC & "|" & t.colD) as new_field from [table$] as t;：

class NewItemCreate extends StatefulWidget{

  @override
  NewItemCreateState createState() => new NewItemCreateState();
}

class NewItemCreateState extends State<NewItemCreate>
{

  File _image;
  Future getImage() async {
    var image = await ImagePicker.pickImage(source: ImageSource.camera);
    setState(() {
      _image = image;
    });
    print(_image.path);
  }
  @override
  Widget build(BuildContext context) {

    return Scaffold(
      backgroundColor: Colors.yellow,

        appBar: new AppBar(
          title: new Text("Report"),
          elevation: 5.0,
        ),
      body:
      Center  (
          child: ListView(
            padding: EdgeInsets.only(left: 24.0, right: 24.0),
            shrinkWrap: true,
            children: <Widget>[
              itemImage,
              SizedBox(height: 18.0),
              itemName,
              SizedBox(height: 18.0),
              itemLocation,
              SizedBox(height: 18.0),
              itemLocation,
              SizedBox(height: 18.0),
              itemTime,
              SizedBox(height: 18.0),
              Report,
              SizedBox(height: 38.0),
            ],
          )
      )
    );

  }

  final itemImage =       Padding(
    padding: EdgeInsets.symmetric(vertical: 25.0),
    child: Material(
      borderRadius: BorderRadius.circular(30.0),
      shadowColor: Colors.lightBlueAccent.shade100,
      elevation: 5.0,
      child: MaterialButton(
        minWidth: 200.0,
        height: 300.0,
        onPressed: (){
          getImage();
        },
        color: Colors.lightGreenAccent,
        child:
        new Icon(Icons.add_a_photo, size: 150.0,color: Colors.blue,),
      ),
    ),
  );

SQL Access，查询中的Concatenate字段

1 个答案: