"在 go 结构中为指针类型赋值"

Question

In an attempt to handle null values when trying to input a struct of data to a database row (using goqu) I've defined a struct similar to

type datain struct {
   id *float32 `db:"id"`
   tempr *float32 `db:"temperature"`
}

Answer 1

When you defined a datain<\/code> variable without any initialization, the value of the id<\/code> was nil, which means you couldn't de-reference it.

var datastruct datain
id := stringToFloat32("1234.4")
datastruct.id = &id