support limit

db/db.go

@@ -13,6 +13,7 @@ type Timetable struct {
 	ID      int64     `json:"id"`
 	Name    string    `json:"name"`
 	Status  bool      `json:"status"`
+	Limit   int64     `json:"limit"`
 	Created time.Time `json:"created"`
 }
 
@@ -51,6 +52,7 @@ var (
 	UpdateTakeCount    *sql.Stmt
 
 	CheckTableStatus *sql.Stmt
+	CheckLimit *sql.Stmt
 )
 
 func init() {
@@ -60,7 +62,7 @@ func init() {
 		log.Fatal(err)
 	}
 
-	if len(os.Args) > 1{
+	if len(os.Args) > 1 {
 		if os.Args[1] == "install" {
 			install()
 			os.Exit(0)
@@ -68,7 +70,7 @@ func init() {
 	}
 
 	GetAllTimetables, err = DB.Prepare(`
-select id, name, status
+select id, name, status, "limit"
 from timetables 
 order by status desc, created desc
 
@@ -77,8 +79,8 @@ order by status desc, created desc
 		log.Fatal(err)
 	}
 	CreateNewTimetable, err = DB.Prepare(`
-insert into timetables (name)
+insert into timetables (name, "limit")
-values ($1)
+values ($1, $2)
 returning id
 	`)
 	if err != nil {
@@ -93,7 +95,8 @@ where id = $1
 	}
 	GetTimeSlotsByTimetable, err = DB.Prepare(`
 select t.id, t."name" ,t."time" ,t.take, t.capacity, t2."name", t2.status,
-	case sub.username when $2 then true else false end as success
+	case sub.username when $2 then true else false end as success,
+	t2."limit"
 from timeslots t
 join timetables t2 on t.ttid = t2.id 
 left outer join (
@@ -137,8 +140,8 @@ where tsid = $1 and username = $2
 	}
 	UpdateTimetableStatus, err = DB.Prepare(`
 update timetables
-set status = $1
+set status = $1, "limit" = $2
-where id = $2
+where id = $3
 	`)
 	if err != nil {
 		log.Fatal(err)
@@ -171,4 +174,15 @@ select status from timetables where id = $1
 	if err != nil {
 		log.Fatal(err)
 	}
+	CheckLimit, err = DB.Prepare(`
+select count(t1.username) < t3."limit" as c
+from takes t1
+join timeslots t2 on t1.tsid = t2.id
+join timetables t3 on t2.ttid = t3.id
+where t1.username = $1 and t3.id = $2
+group by t1.username, t3."limit"
+	`)
+	if err != nil {
+		log.Fatal(err)
+	}
 }

db/install.go

@@ -12,9 +12,10 @@ func install() {
 	}
 
 	_, err = tx.Exec(`
-	CREATE TABLE timetables (
+CREATE TABLE timetables (
 	id serial primary key,
 	"name" text NOT NULL,
+	"limit" integer NOT NULL DEFAULT 1,
 	status bool NOT NULL DEFAULT false,
 	created timestamp NOT NULL DEFAULT now()
 );

main.go

@@ -72,7 +72,7 @@ func main() {
 		}
 		for rows.Next() {
 			s := &db.Timetable{}
-			rows.Scan(&s.ID, &s.Name, &s.Status)
+			rows.Scan(&s.ID, &s.Name, &s.Status, &s.Limit)
 			timetables = append(timetables, s)
 		}
 		c.JSON(http.StatusOK, gin.H{
@@ -82,7 +82,8 @@ func main() {
 
 	api.POST("/timetables", auth, func(c *gin.Context) {
 		type Request struct {
-			Name string `json:"newTimeTableName"`
+			Name  string `json:"newTimeTableName"`
+			Limit int64  `json:"newLimit"`
 		}
 		req := &Request{}
 		err := c.ShouldBindBodyWith(req, binding.JSON)
@@ -90,7 +91,7 @@ func main() {
 			c.AbortWithError(400, err)
 			return
 		}
-		row := db.CreateNewTimetable.QueryRow(req.Name)
+		row := db.CreateNewTimetable.QueryRow(req.Name, req.Limit)
 		var id int64
 		err = row.Scan(&id)
 		if err != nil {
@@ -130,9 +131,10 @@ func main() {
 		timeslots := make([]*db.TimeSlot, 0)
 		var timetableName string
 		var timetableStatus bool
+		var timetableLimit int64
 		for rows.Next() {
 			s := &db.TimeSlot{}
-			err = rows.Scan(&s.ID, &s.Name, &s.Time, &s.Take, &s.Capacity, &timetableName, &timetableStatus, &s.Success)
+			err = rows.Scan(&s.ID, &s.Name, &s.Time, &s.Take, &s.Capacity, &timetableName, &timetableStatus, &s.Success, &timetableLimit)
 			if err != nil {
 				c.AbortWithError(400, err)
 				return
@@ -143,6 +145,7 @@ func main() {
 			"timeslots":       timeslots,
 			"timetableName":   timetableName,
 			"timetableStatus": timetableStatus,
+			"timetableLimit":  timetableLimit,
 		})
 	})
 
@@ -256,7 +259,7 @@ func main() {
 			c.AbortWithError(400, err)
 			return
 		}
-		_, err = db.UpdateTimetableStatus.Exec(req.Status, timetableID)
+		_, err = db.UpdateTimetableStatus.Exec(req.Status, req.Limit, timetableID)
 		if err != nil {
 			c.AbortWithError(400, err)
 			return
@@ -291,6 +294,21 @@ func main() {
 			tx.Rollback()
 			return
 		}
+		can := true
+		row, err := db.CheckLimit.Query(req.Username, timetableID)
+		for row.Next() {
+			err = row.Scan(&can)
+		}
+		if err != nil {
+			c.AbortWithError(400, err)
+			tx.Rollback()
+			return
+		}
+		if !can {
+			c.AbortWithError(401, errors.New("超出报名数量限制"))
+			tx.Rollback()
+			return
+		}
 		updateCountStmt := tx.Stmt(db.UpdateTakeCount)
 		if req.Username[0] == '!' {
 			untakeStmt := tx.Stmt(db.UserUntakeTimeslot)

web/src/components/Home.js

@@ -22,6 +22,7 @@ const Home = () => {
 
   const [timetables, setTimetables] = React.useState([]);
   const [newTimetableName, setNewTimetableName] = React.useState("");
+  const [newLimit, setNewLimit] = React.useState(null);
   const navigator = useNavigate();
 
   const fetchData = async () => {
@@ -48,6 +49,18 @@ const Home = () => {
             }}
             placeholder="班表名"
           />
+          <TextField
+            value={newLimit}
+            onChange={(event) => {
+              let num = parseInt(event.target.value)
+              if (num <= 0) {
+                num = 1;
+              }
+              setNewLimit(num);
+            }}
+            placeholder="每人选择上限"
+            type="number"
+          />
           <Button
             variant="contained"
             color="secondary"
@@ -55,6 +68,7 @@ const Home = () => {
               await post("/timetables", {
                 token,
                 newTimetableName,
+                newLimit,
               });
               await fetchData();
             }}

web/src/components/Timetable.js

@@ -18,10 +18,11 @@ import { UsernameContext } from "./Login";
 import { useNavigate, useParams } from "react-router-dom";
 import { get, post, put } from "../fetches";
 
-const AdminComponent = ({ refresh, timetableStatus }) => {
+const AdminComponent = ({ refresh, timetableStatus, timetableLimit }) => {
   const { username, token } = React.useContext(UsernameContext);
   const [newName, setNewName] = React.useState("");
   const [newTime, setNewTime] = React.useState("");
+  const [newLimit, setNewLimit] = React.useState(timetableLimit);
   const [newCapacity, setNewCapacity] = React.useState(1);
   const params = useParams();
   let { timetableID } = params;
@@ -34,17 +35,11 @@ const AdminComponent = ({ refresh, timetableStatus }) => {
     });
     await refresh();
   };
-  const handleOpen = async () => {
+  const handleChangeStatus = async (status, limit) => {
     await put(`/timetables/${timetableID}`, {
       token,
-      status: true,
+      limit,
-    });
+      status,
-    await refresh();
-  };
-  const handleClose = async () => {
-    await put(`/timetables/${timetableID}`, {
-      token,
-      status: false,
     });
     await refresh();
   };
@@ -85,15 +80,47 @@ const AdminComponent = ({ refresh, timetableStatus }) => {
           添加
         </Button>
         {timetableStatus && (
-          <Button variant="contained" color="warning" onClick={handleClose}>
+          <Button
+            variant="contained"
+            color="warning"
+            onClick={() => {
+              handleChangeStatus(false, timetableLimit);
+            }}
+          >
             暂停报名
           </Button>
         )}
         {!timetableStatus && (
-          <Button variant="contained" color="success" onClick={handleOpen}>
+          <Button
+            variant="contained"
+            color="success"
+            onClick={() => {
+              handleChangeStatus(true, timetableLimit);
+            }}
+          >
             开放报名
           </Button>
         )}
+        <TextField
+          value={newLimit}
+          onChange={(event) => {
+            let number = parseInt(event.target.value);
+            if (number <= 0) {
+              number = 1;
+            }
+            setNewLimit(number);
+          }}
+          type="number"
+        />
+        <Button
+          variant="contained"
+          color="primary"
+          onClick={() => {
+            handleChangeStatus(timetableStatus, newLimit);
+          }}
+        >
+          修改报名限制
+        </Button>
       </Stack>
     )
   );
@@ -103,6 +130,7 @@ const Timetable = () => {
   const [timeslots, setTimeslots] = React.useState([]);
   const [timetableName, setTimetableName] = React.useState("");
   const [timetableStatus, setTimetableStatus] = React.useState(true);
+  const [timetableLimit, setTimetableLimit] = React.useState(null);
   const { username } = React.useContext(UsernameContext);
   const navigator = useNavigate();
   const params = useParams();
@@ -115,6 +143,7 @@ const Timetable = () => {
     setTimeslots(data.timeslots);
     setTimetableName(data.timetableName);
     setTimetableStatus(data.timetableStatus);
+    setTimetableLimit(data.timetableLimit);
   };
   const handleTakeSlot = async (slotID, status) => {
     if (username === "admin") {
@@ -129,7 +158,7 @@ const Timetable = () => {
     }
   };
   React.useEffect(() => {
-    refresh()
+    refresh();
     const interval = setInterval(() => {
       refresh();
     }, 1000);
@@ -150,9 +179,13 @@ const Timetable = () => {
       </Button>
       <Typography variant="h4">{timetableName}</Typography>
 
-      <AdminComponent refresh={refresh} timetableStatus={timetableStatus} />
+      <AdminComponent
+        refresh={refresh}
+        timetableStatus={timetableStatus}
+        timetableLimit={timetableLimit}
+      />
 
-      <Typography>列表实时更新中</Typography>
+      <Typography>列表实时更新中，每人报名限制：{timetableLimit}</Typography>
       <LinearProgress />
       <TableContainer>
         <Table>