tvp_example_test.go

//go:build go1.10
// +build go1.10

package mssql_test

import (
	"database/sql"
	"fmt"
	"log"

	mssql "github.com/denisenkom/go-mssqldb"
)

// This example shows how to use tvp type
func ExampleTVP() {
	const (
		createTable = "CREATE TABLE Location (Name VARCHAR(50), CostRate INT, Availability BIT, ModifiedDate DATETIME2)"

		createTVP = `CREATE TYPE LocationTableType AS TABLE
		(LocationName VARCHAR(50),
		CostRate INT)`

		dropTVP = "IF type_id('LocationTableType') IS NOT NULL DROP TYPE LocationTableType"

		createProc = `CREATE PROCEDURE dbo.usp_InsertProductionLocation
		@TVP LocationTableType READONLY
		AS
		SET NOCOUNT ON
		INSERT INTO Location
		(
			Name,
			CostRate,
			Availability,
			ModifiedDate)
			SELECT *, 0,GETDATE()
			FROM @TVP`

		dropProc = "IF OBJECT_ID('dbo.usp_InsertProductionLocation', 'P') IS NOT NULL DROP PROCEDURE dbo.usp_InsertProductionLocation"

		execTvp = "exec dbo.usp_InsertProductionLocation @TVP;"
	)
	type LocationTableTvp struct {
		LocationName    string
		LocationCountry string `tvp:"-"`
		CostRate        int64
		Currency        string `json:"-"`
	}

	connString := makeConnURL().String()

	db, err := sql.Open("sqlserver", connString)
	if err != nil {
		log.Fatal("Open connection failed:", err.Error())
	}
	defer db.Close()

	_, err = db.Exec(createTable)
	if err != nil {
		log.Fatal(err)
	}
	_, err = db.Exec(createTVP)
	if err != nil {
		log.Fatal(err)
	}
	defer db.Exec(dropTVP)
	_, err = db.Exec(createProc)
	if err != nil {
		log.Fatal(err)
	}
	defer db.Exec(dropProc)

	locationTableTypeData := []LocationTableTvp{
		{
			LocationName:    "Alberta",
			LocationCountry: "Canada",
			CostRate:        0,
			Currency:        "CAD",
		},
		{
			LocationName:    "British Columbia",
			LocationCountry: "Canada",
			CostRate:        1,
			Currency:        "CAD",
		},
	}

	tvpType := mssql.TVP{
		TypeName: "LocationTableType",
		Value:    locationTableTypeData,
	}

	_, err = db.Exec(execTvp, sql.Named("TVP", tvpType))
	if err != nil {
		log.Fatal(err)
	} else {
		for _, locationData := range locationTableTypeData {
			fmt.Printf("Data for location %s, %s has been inserted.\n", locationData.LocationName, locationData.LocationCountry)
		}
	}
}