db.QueryContext（ctx，query，args）为相同的db变量建立新连接

I am using a variable "db *sql.DB" on which I have defined 2 methods A() and B(). B() is called inside A() with same "db" variable used to call A(). (--CHECK CODE--) Now the db.ExecContext() func is creating a new DB connection in B() even though the same variable is passed into B(). It should have used same connection made in its call in A(). Please tell a solution..

type caller struct{
    db *sql.DB
}
func (caller) A(){
    db.ExecContext()
    db.B()
}

func (caller) B(){
    db.ExecContext()
}

So what was happening is I was doing

A(){
    rows, _ := db.ExecContext()
    defer rows.close()

    for rows.Next(){

        B()

    }
}

So this B() was called before the defer could close that previous connection made by "ExecContext" and started making new connections. I had to call B() in a separate loop after all the rows are fetched.