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51 lines
1.1 KiB
51 lines
1.1 KiB
package main
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import (
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"database/sql"
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"database/sql/driver"
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"fmt"
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"reflect"
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"gopkg.in/go-playground/validator.v9"
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)
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// DbBackedUser User struct
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type DbBackedUser struct {
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Name sql.NullString `validate:"required"`
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Age sql.NullInt64 `validate:"required"`
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}
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// use a single instance of Validate, it caches struct info
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var validate *validator.Validate
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func main() {
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validate = validator.New()
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// register all sql.Null* types to use the ValidateValuer CustomTypeFunc
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validate.RegisterCustomTypeFunc(ValidateValuer, sql.NullString{}, sql.NullInt64{}, sql.NullBool{}, sql.NullFloat64{})
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// build object for validation
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x := DbBackedUser{Name: sql.NullString{String: "", Valid: true}, Age: sql.NullInt64{Int64: 0, Valid: false}}
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err := validate.Struct(x)
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if err != nil {
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fmt.Printf("Err(s):\n%+v\n", err)
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}
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}
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// ValidateValuer implements validator.CustomTypeFunc
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func ValidateValuer(field reflect.Value) interface{} {
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if valuer, ok := field.Interface().(driver.Valuer); ok {
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val, err := valuer.Value()
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if err == nil {
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return val
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}
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// handle the error how you want
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}
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return nil
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}
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