How Can Golang Efficiently Check for and Insert Database Records if Needed?

Using Golang to Efficiently Check and Insert Records Into a Database

This code snippet explores a scenario where we want to ensure the existence of a record in a database and insert it if it's not present using Golang. The code establishes a connection to a MySQL database and executes a query to check the sum of a specific column across multiple tables.

To enhance this functionality, we can add an if-else block to check if the record exists using a separate SQL query. If the record already exists, the code proceeds as usual. However, if it doesn't, it initiates an additional INSERT statement to insert the record into the database.

Here's the modified code:

func main() {
    router := gin.New()
    router.Use(gin.Logger())
    router.Use(gin.Recovery())

    db, err := sql.Open("mysql", "root:password@tcp(gpstest.cksiqniek8yk.ap-south-1.rds.amazonaws.com:3306)/tech")
    if err != nil {
        fmt.Print(err.Error())
    }
    err = db.Ping()
    if err != nil {
        fmt.Print(err.Error())
    }

    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;")

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

    // Insert record if it doesn't exist
    if !exists {
        if err := db.Exec("INSERT ..."); err != nil {
            return err
        }
    }
}

This modification ensures that the database always has the latest data, even if a record is initially absent.

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