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|
package pgtype
import (
"database/sql/driver"
"encoding/binary"
"fmt"
"math"
"strconv"
"github.com/jackc/pgio"
)
// pguint32 is the core type that is used to implement PostgreSQL types such as
// CID and XID.
type pguint32 struct {
Uint uint32
Status Status
}
// Set converts from src to dst. Note that as pguint32 is not a general
// number type Set does not do automatic type conversion as other number
// types do.
func (dst *pguint32) Set(src interface{}) error {
switch value := src.(type) {
case int64:
if value < 0 {
return fmt.Errorf("%d is less than minimum value for pguint32", value)
}
if value > math.MaxUint32 {
return fmt.Errorf("%d is greater than maximum value for pguint32", value)
}
*dst = pguint32{Uint: uint32(value), Status: Present}
case uint32:
*dst = pguint32{Uint: value, Status: Present}
default:
return fmt.Errorf("cannot convert %v to pguint32", value)
}
return nil
}
func (dst pguint32) Get() interface{} {
switch dst.Status {
case Present:
return dst.Uint
case Null:
return nil
default:
return dst.Status
}
}
// AssignTo assigns from src to dst. Note that as pguint32 is not a general number
// type AssignTo does not do automatic type conversion as other number types do.
func (src *pguint32) AssignTo(dst interface{}) error {
switch v := dst.(type) {
case *uint32:
if src.Status == Present {
*v = src.Uint
} else {
return fmt.Errorf("cannot assign %v into %T", src, dst)
}
case **uint32:
if src.Status == Present {
n := src.Uint
*v = &n
} else {
*v = nil
}
}
return nil
}
func (dst *pguint32) DecodeText(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = pguint32{Status: Null}
return nil
}
n, err := strconv.ParseUint(string(src), 10, 32)
if err != nil {
return err
}
*dst = pguint32{Uint: uint32(n), Status: Present}
return nil
}
func (dst *pguint32) DecodeBinary(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = pguint32{Status: Null}
return nil
}
if len(src) != 4 {
return fmt.Errorf("invalid length: %v", len(src))
}
n := binary.BigEndian.Uint32(src)
*dst = pguint32{Uint: n, Status: Present}
return nil
}
func (src pguint32) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
return append(buf, strconv.FormatUint(uint64(src.Uint), 10)...), nil
}
func (src pguint32) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
return pgio.AppendUint32(buf, src.Uint), nil
}
// Scan implements the database/sql Scanner interface.
func (dst *pguint32) Scan(src interface{}) error {
if src == nil {
*dst = pguint32{Status: Null}
return nil
}
switch src := src.(type) {
case uint32:
*dst = pguint32{Uint: src, Status: Present}
return nil
case int64:
*dst = pguint32{Uint: uint32(src), Status: Present}
return nil
case string:
return dst.DecodeText(nil, []byte(src))
case []byte:
srcCopy := make([]byte, len(src))
copy(srcCopy, src)
return dst.DecodeText(nil, srcCopy)
}
return fmt.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src pguint32) Value() (driver.Value, error) {
switch src.Status {
case Present:
return int64(src.Uint), nil
case Null:
return nil, nil
default:
return nil, errUndefined
}
}
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