GoLang Table to Struct?

[rahul_asati04]

This site has a good example to insert and select data from kdb process.

https://janrock.medium.com/kdb-golang-oanda-e9bec0570799

 

Here is an updated example from that site to show selecting kdb data in go process and storing that in go structure.

 

KDB  `trade`  table

 

q)trade 
time sym price 
--------------------------------------- 
2015.10.19D18:40:22.982760448 a 100 
2009.02.21D21:21:02.534721216 b 200

 

 

Go Code

 

package main import ( "time" "fmt" kdb "github.com/sv/kdbgo" ) 
// Go struct to store KDB table type trade struct { Ts time.Time Sym string Price int64 } 
// Function to convert KDB data to GO struct 
func tableToStruct(tbl kdb.Table) []trade {
var data = []trade{} 
rowCount := int(tbl.Data[0].Len()) 
for i := 0; i < rowCount; i++ {
 rec := trade{
Ts: tbl.Data[0].Index(i).(time.Time), 
Sym: tbl.Data[1].Index(i).(string), 
Price: tbl.Data[2].Index(i).(int64)
} 
data = append(data, rec) 
}
return data
} 

func main() { 
con, err := kdb.DialKDB("localhost", 5000, "") 
if err != nil { 
fmt.Println("Failed to connect: %v", err) 
}

ktbl, err := con.Call("select time, sym, price from trade")
if err != nil 
{ 
fmt.Println("Query failed: %v", err) 
return 
}

series := tableToStruct(ktbl.Data.(kdb.Table)) 
for _, v := range series 
{ 
fmt.Printf("Timestamp: %v | Sym: %v | Price: %v n", v.Ts, v.Sym, v.Price) 
} 
con.Close()
 }

 

Go Output:

$ go run go-kdb.go

Timestamp: 2015-10-19 18:40:22.982760448 +0000 UTC | Sym: a | Price: 100

Timestamp: 2009-02-21 21:21:02.534721216 +0000 UTC | Sym: b | Price: 200