47 lines
983 B
Go
47 lines
983 B
Go
package dbutil
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import (
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"database/sql/driver"
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"encoding/json"
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"fmt"
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)
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// JSON is a utility type for using arbitrary JSON data as values in database Exec and Scan calls.
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type JSON struct {
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Data any
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}
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func (j JSON) Scan(i any) error {
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switch value := i.(type) {
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case nil:
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return nil
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case string:
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return json.Unmarshal([]byte(value), j.Data)
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case []byte:
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return json.Unmarshal(value, j.Data)
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default:
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return fmt.Errorf("invalid type %T for dbutil.JSON.Scan", i)
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}
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}
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func (j JSON) Value() (driver.Value, error) {
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if j.Data == nil {
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return nil, nil
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}
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v, err := json.Marshal(j.Data)
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return string(v), err
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}
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// JSONPtr is a convenience function for wrapping a pointer to a value in the JSON utility, but removing typed nils
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// (i.e. preventing nils from turning into the string "null" in the database).
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func JSONPtr[T any](val *T) JSON {
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return JSON{Data: UntypedNil(val)}
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}
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func UntypedNil[T any](val *T) any {
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if val == nil {
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return nil
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}
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return val
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}
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