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sql.go
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sql.go
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//go:build sql_scanner
// +build sql_scanner
package fixed
import (
"database/sql/driver"
"fmt"
)
// Scan implements the sql.Scanner interface for database deserialization.
func (f *Fixed) Scan(value interface{}) error {
// first try to see if the data is stored in database as a Numeric datatype
switch v := value.(type) {
case float32:
*f = NewF(float64(v))
return nil
case float64:
// numeric in sqlite3 sends us float64
*f = NewF(v)
return nil
case int64:
*f = NewI(v, nPlaces)
return nil
default:
// default is trying to interpret value stored as string
str, err := unquoteIfQuoted(v)
if err != nil {
return err
}
val, err := NewSErr(str)
if err != nil {
return err
}
*f = val
return nil
}
}
func unquoteIfQuoted(value interface{}) (string, error) {
var bytes []byte
switch v := value.(type) {
case string:
bytes = []byte(v)
case []byte:
bytes = v
default:
return "", fmt.Errorf("could not convert value '%+v' to byte array of type '%T'",
value, value)
}
// If the amount is quoted, strip the quotes
if len(bytes) > 2 && bytes[0] == '"' && bytes[len(bytes)-1] == '"' {
bytes = bytes[1 : len(bytes)-1]
}
return string(bytes), nil
}
// Value implements the driver.Valuer interface for database serialization.
func (f Fixed) Value() (driver.Value, error) {
return f.String(), nil
}