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mysqltutorial/insert/main.go
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package main | |
import ( | |
"context" | |
"database/sql" | |
"fmt" | |
"log" | |
"strings" | |
"time" | |
_ "github.com/go-sql-driver/mysql" | |
) | |
const ( | |
username = "root" | |
password = "password" | |
hostname = "127.0.0.1:3306" | |
dbname = "ecommerce" | |
) | |
type product struct { | |
name string | |
price int | |
} | |
func dsn(dbName string) string { | |
return fmt.Sprintf("%s:%s@tcp(%s)/%s", username, password, hostname, dbName) | |
} | |
func dbConnection() (*sql.DB, error) { | |
db, err := sql.Open("mysql", dsn("")) | |
if err != nil { | |
log.Printf("Error %s when opening DB\n", err) | |
return nil, err | |
} | |
//defer db.Close() | |
ctx, cancelfunc := context.WithTimeout(context.Background(), 5*time.Second) | |
defer cancelfunc() | |
res, err := db.ExecContext(ctx, "CREATE DATABASE IF NOT EXISTS "+dbname) | |
if err != nil { | |
log.Printf("Error %s when creating DB\n", err) | |
return nil, err | |
} | |
no, err := res.RowsAffected() | |
if err != nil { | |
log.Printf("Error %s when fetching rows", err) | |
return nil, err | |
} | |
log.Printf("rows affected %d\n", no) | |
db.Close() | |
db, err = sql.Open("mysql", dsn(dbname)) | |
if err != nil { | |
log.Printf("Error %s when opening DB", err) | |
return nil, err | |
} | |
//defer db.Close() | |
db.SetMaxOpenConns(20) | |
db.SetMaxIdleConns(20) | |
db.SetConnMaxLifetime(time.Minute * 5) | |
ctx, cancelfunc = context.WithTimeout(context.Background(), 5*time.Second) | |
defer cancelfunc() | |
err = db.PingContext(ctx) | |
if err != nil { | |
log.Printf("Errors %s pinging DB", err) | |
return nil, err | |
} | |
log.Printf("Connected to DB %s successfully\n", dbname) | |
return db, nil | |
} | |
func createProductTable(db *sql.DB) error { | |
query := `CREATE TABLE IF NOT EXISTS product(product_id int primary key auto_increment, product_name text, | |
product_price int, created_at datetime default CURRENT_TIMESTAMP, updated_at datetime default CURRENT_TIMESTAMP)` | |
ctx, cancelfunc := context.WithTimeout(context.Background(), 5*time.Second) | |
defer cancelfunc() | |
res, err := db.ExecContext(ctx, query) | |
if err != nil { | |
log.Printf("Error %s when creating product table", err) | |
return err | |
} | |
rows, err := res.RowsAffected() | |
if err != nil { | |
log.Printf("Error %s when getting rows affected", err) | |
return err | |
} | |
log.Printf("Rows affected when creating table: %d", rows) | |
return nil | |
} | |
func insert(db *sql.DB, p product) error { | |
query := "INSERT INTO product(product_name, product_price) VALUES (?, ?)" | |
ctx, cancelfunc := context.WithTimeout(context.Background(), 5*time.Second) | |
defer cancelfunc() | |
stmt, err := db.PrepareContext(ctx, query) | |
if err != nil { | |
log.Printf("Error %s when preparing SQL statement", err) | |
return err | |
} | |
defer stmt.Close() | |
res, err := stmt.ExecContext(ctx, p.name, p.price) | |
if err != nil { | |
log.Printf("Error %s when inserting row into products table", err) | |
return err | |
} | |
rows, err := res.RowsAffected() | |
if err != nil { | |
log.Printf("Error %s when finding rows affected", err) | |
return err | |
} | |
log.Printf("%d products created ", rows) | |
prdID, err := res.LastInsertId() | |
if err != nil { | |
log.Printf("Error %s when getting last inserted product", err) | |
return err | |
} | |
log.Printf("Product with ID %d created", prdID) | |
return nil | |
} | |
func multipleInsert(db *sql.DB, products []product) error { | |
query := "INSERT INTO product(product_name, product_price) VALUES " | |
var inserts []string | |
var params []interface{} | |
for _, v := range products { | |
inserts = append(inserts, "(?, ?)") | |
params = append(params, v.name, v.price) | |
} | |
queryVals := strings.Join(inserts, ",") | |
query = query + queryVals | |
log.Println("query is", query) | |
ctx, cancelfunc := context.WithTimeout(context.Background(), 5*time.Second) | |
defer cancelfunc() | |
stmt, err := db.PrepareContext(ctx, query) | |
if err != nil { | |
log.Printf("Error %s when preparing SQL statement", err) | |
return err | |
} | |
defer stmt.Close() | |
res, err := stmt.ExecContext(ctx, params...) | |
if err != nil { | |
log.Printf("Error %s when inserting row into products table", err) | |
return err | |
} | |
rows, err := res.RowsAffected() | |
if err != nil { | |
log.Printf("Error %s when finding rows affected", err) | |
return err | |
} | |
log.Printf("%d products created simultaneously", rows) | |
return nil | |
} | |
func main() { | |
db, err := dbConnection() | |
if err != nil { | |
log.Printf("Error %s when getting db connection", err) | |
return | |
} | |
defer db.Close() | |
log.Printf("Successfully connected to database") | |
err = createProductTable(db) | |
if err != nil { | |
log.Printf("Create product table failed with error %s", err) | |
return | |
} | |
p := product{ | |
name: "iphone", | |
price: 950, | |
} | |
err = insert(db, p) | |
if err != nil { | |
log.Printf("Insert product failed with error %s", err) | |
return | |
} | |
p1 := product{ | |
name: "Galaxy", | |
price: 990, | |
} | |
p2 := product{ | |
name: "iPad", | |
price: 500, | |
} | |
err = multipleInsert(db, []product{p1, p2}) | |
if err != nil { | |
log.Printf("Multiple insert failed with error %s", err) | |
return | |
} | |
} |