update demo

examples/go/demo.go

 package main
 
 import (
-	"container/heap"
 	"database/sql"
 	"database/sql/driver"
 	"flag"
 	"fmt"
-	"reflect"
-	"strconv"
-	"strings"
 	"sync"
 	"time"
-
+	"strings"
+	"container/heap"
+	"strconv"
+	"reflect"
+	
+  
 	_ "github.com/taosdata/driver-go/v2/taosSql"
 )
 
+
+
 type heapElem struct {
-	timeout int64
-	colName string
+	timeout int64 
+    colName string 	
 }
 
-type MinHeap []heapElem
+type MinHeap []heapElem 
+
 
 type Column struct {
+	  
 }
 
 func (h MinHeap) Len() int {
@@ -32,16 +37,16 @@ func (h MinHeap) Len() int {
 func (h MinHeap) Less(i, j int) bool {
 	res := h[i].timeout - h[j].timeout
 	if res < 0 {
-		return true
+		return true;
 	} else if res > 0 {
-		return false
+		return false;
 	}
-
-	cmp := strings.Compare(h[i].colName, h[j].colName)
-	if cmp <= 0 {
-		return true
+	
+  cmp := strings.Compare(h[i].colName, h[j].colName)	
+	if (cmp <= 0) {
+		return true;
 	} else {
-		return false
+		return false;
 	}
 }
 
@@ -64,20 +69,20 @@ func (h *MinHeap) Top() heapElem {
 	return (*h)[0]
 }
 
-func (h *MinHeap) Pop() interface{} {
+func (h *MinHeap) Pop() interface{}{
 	res := (*h)[len(*h)-1]
 	*h = (*h)[:len(*h)-1]
 	return res
 }
 
 type config struct {
-	hostName   string
-	serverPort int
-	user       string
-	password   string
-	dbName     string
-	srcdbname  string
-	supTblName string
+	hostName             string
+	serverPort           int
+	user                 string
+	password             string
+	dbName               string
+	srcdbName               string
+	supTblName           string
 }
 
 var configPara config
@@ -89,10 +94,10 @@ func init() {
 	flag.IntVar(&configPara.serverPort, "p", 6030, "The TCP/IP port number to use for the connection to TDengine server.")
 	flag.StringVar(&configPara.user, "u", "root", "The TDengine user name to use when connecting to the server.")
 	flag.StringVar(&configPara.password, "P", "taosdata", "The password to use when connecting to the server.")
-	flag.StringVar(&configPara.dbName, "d", "test1", "Destination database.")
-	flag.StringVar(&configPara.srcdbname, "s", "test", "Destination database.")
+	flag.StringVar(&configPara.dbName, "d", "test1", "check  database.")
+	flag.StringVar(&configPara.srcdbName, "s", "test", "Destination database.")
 	flag.Parse()
-
+	
 }
 
 func checkErr(err error, prompt string) {
@@ -102,15 +107,16 @@ func checkErr(err error, prompt string) {
 	}
 }
 
+
 type schema struct {
 	idx        int
 	numOfField int
-	timestamp  time.Time
-	colName    string
-	interval   int32
-	threshold  int32
+	timestamp  time.Time 
+	colName   string
+	interval  int32
+	threshold int32
+	
 }
-
 type demo struct {
 	db *sql.DB
 
@@ -123,9 +129,13 @@ type demo struct {
 	dInterval  int32
 	dThreshold int32
 
+  suptabname string
+
 	metaDict map[string]*schema
 	heap     MinHeap
 	timer    *time.Timer
+
+  wg       *sync.WaitGroup
 }
 
 /***
@@ -137,6 +147,12 @@ type demo struct {
 
 ***/
 
+type taskInfo struct {
+   wg      *sync.WaitGroup
+   subtask map[string] *demo
+}
+
+
 type tableInfo struct {
 	tbname     string
 	createTime string
@@ -147,34 +163,28 @@ type tableInfo struct {
 	vgId       int32
 }
 
-func (d *demo) Init(wg *sync.WaitGroup) {
-	d.heap = make(MinHeap, 0, 200)
-	heap.Init(&d.heap)
-	d.metaDict = make(map[string]*schema)
 
+func taskInit(db *sql.DB, dbname string, srcdbname string, metatable string, exptable string, tskinfo *taskInfo) {
 	{
-		sql := fmt.Sprintf("create database if not exists %s update 2", d.dbname)
-		_, err := d.db.Exec(sql)
+		sql := fmt.Sprintf("create database if not exists %s update 2", dbname)
+		_, err := db.Exec(sql)
 		checkErr(err, sql)
 	}
-
 	{
-		sql := fmt.Sprintf("create stable if not exists %s.%s (ts timestamp, dbname binary(64), tabname binary(64), colname binary(64), lastTime timestamp,  offline int) tags(tablename binary(128))", d.dbname, d.exceptTable)
-		_, err := d.db.Exec(sql)
+		sql := fmt.Sprintf("create stable if not exists %s.%s (ts timestamp, dbname binary(64), tabname binary(64), colname binary(64), lastTime timestamp,  offline int) tags(tablename binary(128))", dbname, exptable)
+		_, err := db.Exec(sql)
 		checkErr(err, sql)
 	}
 
 	{
-		sql := fmt.Sprintf("create table if not exists %s.%s (ts timestamp,  dbname binary(64), tablename binary(64), colName binary(128),  checkInterval int, threshold  int)", d.dbname, d.metaTable)
-		_, err := d.db.Exec(sql)
+		sql := fmt.Sprintf("create table if not exists %s.%s (ts timestamp,  dbname binary(64), tablename binary(64), colName binary(128),  checkInterval int, threshold  int)", dbname, metatable)
+		_, err := db.Exec(sql)
 		checkErr(err, sql)
 	}
 
-	fieldTs := time.Now().Add(time.Hour * -1000)
-
-	sql := "show " + d.srcdbname + ".tables"
+	sql := "show " + srcdbname + ".tables"
 	tbs := make([]tableInfo, 0, 512)
-	rows, _ := d.db.Query(sql)
+	rows, _ := db.Query(sql)
 	for rows.Next() {
 		var (
 			tbname     string
@@ -189,28 +199,141 @@ func (d *demo) Init(wg *sync.WaitGroup) {
 		if err != nil {
 			checkErr(err, sql)
 		}
+
+		// ignore exceptable name
+		if strings.Compare(strings.ToLower(tbname), strings.ToLower(metatable)) == 0 || strings.Compare(tbname, exptable) == 0 || strings.HasPrefix(strings.ToLower(stbname), strings.ToLower(exptable)) == true {
+			continue
+		}
+
+		// ignore normal table
+		if len(stbname) == 0 || strings.Compare(stbname, "") == 0 {
+			continue
+		}
+
 		tbs = append(tbs, tableInfo{tbname: tbname, createTime: createTime, columns: columns, stbname: stbname, uid: uid, tid: tid, vgId: vgId})
 	}
 	rows.Close()
 
-	for _, e := range tbs {
+	fieldTs := time.Now().Add(time.Hour * -1000)
+
+  for _, e := range tbs {
 		tbname := e.tbname
-		//createTime := e.createTime
 		columns := e.columns
 		stbname := e.stbname
-		//uid        := e.uid
-		//tid        := e.tid
-		//vgId       := vgId
+		fields := make([]string, 0, columns)
+		{
+			subsql := "describe " + srcdbname + "." + stbname
 
-		// ignore exceptable name
-		if strings.Compare(strings.ToLower(tbname), strings.ToLower(d.metaTable)) == 0 || strings.Compare(tbname, d.exceptTable) == 0 || strings.HasPrefix(strings.ToLower(stbname), strings.ToLower(d.exceptTable)) == true {
-			continue
+			subRows, err := db.Query(subsql)
+			if err != nil {
+				checkErr(err, subsql)
+			}
+
+			count := 0
+			for subRows.Next() {
+				var field string
+				var ty string
+				var len int32
+				var note string
+				subRows.Scan(&field, &ty, &len, &note)
+
+        // ignore time and tag col
+				if count != 0 && strings.Compare(note, "TAG") != 0 {
+					// skip first and skip tag col
+					fields = append(fields, field)
+				}
+				count = count + 1
+
+			}
+			defer subRows.Close()
 		}
+		for _, f := range fields {
+			count := 0
+			{
+				checkSql := fmt.Sprintf("select * from %s.%s where dbname = \"%s\" and tablename = \"%s\" and colname = \"%s\"", dbname, metatable, dbname, tbname, f)
+				checkRow, err := db.Query(checkSql)
+				if err != nil {
+					checkErr(err, checkSql)
+				}
 
-		// ignore normal table
-		if len(stbname) == 0 || strings.Compare(stbname, "") == 0 {
-			continue
+				for checkRow.Next() {
+					count = count + 1
+          break
+				}
+				if count != 0 {
+					continue
+				}
+				defer checkRow.Close()
+			}
+
+      if count == 0 {
+				sql := fmt.Sprintf("insert into %s.%s values(%v, \"%s\", \"%s\", \"%s\", %d, %d)", dbname, metatable, fieldTs.UnixMilli(), dbname, tbname, f, 2, 2)
+				_, err := db.Exec(sql)
+				if err != nil {
+					checkErr(err, sql)
+				}
+      }
+			fieldTs = fieldTs.Add(time.Millisecond * 2)
+    }
+
+    key := fmt.Sprintf("%s_%s", srcdbname, stbname)
+    _, ok := tskinfo.subtask[key]
+    if !ok {
+      tskinfo.subtask[key] = &demo{db: db, dbname: dbname, srcdbname: srcdbname, suptabname: stbname, metaTable: metatable, exceptTable: exptable, wg: tskinfo.wg}
+    }
+  }
+} 
+
+func subTaskStart(d *demo) {
+    
+	d.Init()
+	for {
+	  select {
+	  case <-d.timer.C:
+		  timeout := d.NextTimout()
+		  fmt.Printf("stbname %s, timeout %d\n", d.suptabname, timeout)
+		  d.timer.Reset(time.Second * time.Duration(timeout))
+	}
+	}
+  d.wg.Done()
+  
+}
+func (d *demo) Init() {
+	d.heap = make(MinHeap, 0, 200)
+	heap.Init(&d.heap)
+	d.metaDict = make(map[string]*schema)
+
+	fieldTs := time.Now().Add(time.Hour * -1000)
+
+	sql := "show " + d.srcdbname + ".tables"
+	tbs := make([]tableInfo, 0, 512)
+	rows, _ := d.db.Query(sql)
+	for rows.Next() {
+		var (
+			tbname     string
+			createTime string
+			columns    int
+			stbname    string = ""
+			uid        int64
+			tid        int64
+			vgId       int32
+		)
+		err := rows.Scan(&tbname, &createTime, &columns, &stbname, &uid, &tid, &vgId)
+		if err != nil {
+			checkErr(err, sql)
 		}
+    if (strings.Compare(stbname, d.suptabname) == 0) {
+		  tbs = append(tbs, tableInfo{tbname: tbname, createTime: createTime, columns: columns, stbname: stbname, uid: uid, tid: tid, vgId: vgId})
+    }
+
+	}
+	rows.Close()
+
+
+	for _, e := range tbs {
+		tbname := e.tbname
+		columns := e.columns
+		stbname := e.stbname
 
 		fields := make([]string, 0, columns)
 		// sub sql
@@ -230,6 +353,7 @@ func (d *demo) Init(wg *sync.WaitGroup) {
 				var note string
 				subRows.Scan(&field, &ty, &len, &note)
 
+        // ignore time and tag col
 				if count != 0 && strings.Compare(note, "TAG") != 0 {
 					// skip first and skip tag col
 					fields = append(fields, field)
@@ -309,7 +433,6 @@ func (d *demo) Init(wg *sync.WaitGroup) {
 	}
 
 	d.timer = time.NewTimer(time.Second * 1)
-	wg.Done()
 }
 
 type ValueRows struct {
@@ -415,16 +538,13 @@ func (d *demo) NextTimout() int32 {
 			cvttime, is := v.(time.Time)
 
 			if is {
-				fmt.Println("yes ")
 				cacheTs[cacheKey] = &ValueRows{rows: values, ts: cvttime}
 				ts = cvttime
 			} else {
-				fmt.Println("no")
 				cacheTs[cacheKey] = &ValueRows{rows: values, ts: ts}
 				ts = ts
 			}
 
-			fmt.Printf("time %v \n", ts.UnixMilli())
 			rows.Close()
 		}
 
@@ -434,8 +554,8 @@ func (d *demo) NextTimout() int32 {
 		cost := int32(dura.Seconds())
 		if cost == 0 {
 			elem.timestamp = ts
-			fmt.Printf("A dura %d, threshold %d insert\n", cost, elem.threshold)
 			sql := fmt.Sprintf("insert into %s.%s using %s.%s tags(\"%s\") values(%v, \"%s\", \"%s\", \"%s\", %v, %d)", d.dbname, exceptTableName, d.dbname, d.exceptTable, exceptTableName, time.Now().UnixMilli(), d.dbname, tabName, colName, ts.UnixMilli(), int(time.Now().Sub(elem.timestamp).Seconds()))
+      fmt.Printf("INSERT SQL: %s\n", sql) 
 			_, err := d.db.Exec(sql)
 			if err != nil {
 				checkErr(err, sql)
@@ -443,15 +563,15 @@ func (d *demo) NextTimout() int32 {
 		} else {
 			elem.timestamp = ts
 			if cost > elem.threshold {
-				fmt.Printf("B dura %d, threshold %d insert \n", cost, elem.threshold)
 				sql := fmt.Sprintf("insert into %s.%s using %s.%s tags(\"%s\") values(%v, \"%s\", \"%s\", \"%s\", %v, %d)", d.dbname, exceptTableName, d.dbname, d.exceptTable, exceptTableName, time.Now().UnixMilli(), d.dbname, tabName, colName, ts.UnixMilli(), int(time.Now().Sub(elem.timestamp).Seconds()))
+        fmt.Printf("INSERT SQL: %s\n", sql) 
 
 				_, err := d.db.Exec(sql)
 				if err != nil {
 					checkErr(err, sql)
 				}
 			} else {
-				fmt.Printf("C dura %d, threshold %d not insert \n", cost, elem.threshold)
+				//fmt.Printf("C dura %d, threshold %d not insert \n", cost, elem.threshold)
 			}
 		}
 		heap.Push(&d.heap, heapElem{timeout: int64(elem.interval) + now, colName: e})
@@ -476,7 +596,7 @@ func printAllArgs() {
 	fmt.Printf("usr:                  %v\n", configPara.user)
 	fmt.Printf("password:             %v\n", configPara.password)
 	fmt.Printf("dbName:               %v\n", configPara.dbName)
-	fmt.Printf("srcDbName:            %v\n", configPara.srcdbname)
+	fmt.Printf("srcDbName:            %v\n", configPara.srcdbName)
 	fmt.Printf("stbNme:               %v\n", configPara.supTblName)
 	fmt.Printf("================================================\n")
 }
@@ -491,22 +611,12 @@ func main() {
 		checkErr(err, "failed to connect db")
 	}
 	wg := sync.WaitGroup{}
-	demo := &demo{db: db, dbname: configPara.dbName, srcdbname: configPara.srcdbname, metaTable: "metaTable", exceptTable: "exceptTable", dStartTs: 0, dInterval: 2, dThreshold: 2}
-	wg.Add(1)
-	go demo.Init(&wg)
-
-	wg.Wait()
-
-	demo.Update("st1", "t1", "f", 10, 20)
-
-	fmt.Println("time start")
-	for {
-		select {
-		case <-demo.timer.C:
-			timeout := demo.NextTimout()
-			fmt.Printf("timeout %d\n", timeout)
-			demo.timer.Reset(time.Second * time.Duration(timeout))
-		}
-	}
-
+  info := &taskInfo{subtask : make(map[string] *demo), wg: &wg}
+  
+  taskInit(db, configPara.dbName, configPara.srcdbName, "metatable", "exptable", info)
+  for _, v := range info.subtask {
+    wg.Add(1)
+    go subTaskStart(v) 
+  }
+  wg.Wait()
 }