I want to check if record exist and if not exist then i want to insert that record to database using golang

Question

package main

import (
    \"database/sql\"
    \"fmt\"

    \"github.com/gin-gonic/gin\"
)

func main() {

    router := gin.New()
    router.Use(gin.Logger())
             


        

Answer 1

IGNORE is your friend!

You can do it directly with one query if you have a unique index of the field that you want to check with a query like this:

INSERT IGNORE .........;

Answer 2

First execute the select statement. Then with rows.Next() check if there is a record on the database. If not, execute the insert query.

rows, err := db.Query("select sum(usercount) as usercount from ( select count(*) as usercount from category where name = 'construction' union all  select count(*) as usercount from sub_category where name = 'construction'  union all  select count(*) as usercount from industry where name = 'construction' ) as usercounts;")
if err != nil {
    log.Fatal(err)
}

if rows.Next() {
    //exists
} else {
    db.Query("INSERT INTO...")
}

Answer 3

One possible approach would be:

var exists bool
row := db.QueryRow("SELECT EXISTS(SELECT 1 FROM ...)")
if err := row.Scan(&exists); err != nil {
    return err
} else if !exists {
    if err := db.Exec("INSERT ..."); err != nil {
        return err
    }
}