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e654d1f0fc
To aid in composability, these methods no longer write their own length. This is especially useful for text formatted arrays and may be useful for future database/sql compatibility. It also makes the code a little simpler as the types no longer have to compute their own size. Along with this, these methods cannot encode NULL. They now return a boolean if they are NULL. This also benefits text array encoding as numeric arrays require NULL to be exactly `NULL` while string arrays require NULL to be `"NULL"`.
108 lines
2.2 KiB
Go
108 lines
2.2 KiB
Go
package pgtype
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import (
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"encoding/binary"
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"fmt"
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"io"
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"strconv"
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"github.com/jackc/pgx/pgio"
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)
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// pguint32 is the core type that is used to implement PostgreSQL types such as
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// CID and XID.
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type pguint32 struct {
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Uint uint32
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Status Status
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}
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// ConvertFrom converts from src to dst. Note that as pguint32 is not a general
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// number type ConvertFrom does not do automatic type conversion as other number
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// types do.
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func (dst *pguint32) ConvertFrom(src interface{}) error {
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switch value := src.(type) {
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case uint32:
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*dst = pguint32{Uint: value, Status: Present}
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default:
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return fmt.Errorf("cannot convert %v to pguint32", value)
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}
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return nil
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}
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// AssignTo assigns from src to dst. Note that as pguint32 is not a general number
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// type AssignTo does not do automatic type conversion as other number types do.
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func (src *pguint32) AssignTo(dst interface{}) error {
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switch v := dst.(type) {
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case *uint32:
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if src.Status == Present {
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*v = src.Uint
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} else {
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return fmt.Errorf("cannot assign %v into %T", src, dst)
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}
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case **uint32:
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if src.Status == Present {
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n := src.Uint
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*v = &n
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} else {
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*v = nil
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}
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}
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return nil
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}
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func (dst *pguint32) DecodeText(src []byte) error {
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if src == nil {
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*dst = pguint32{Status: Null}
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return nil
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}
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n, err := strconv.ParseUint(string(src), 10, 32)
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if err != nil {
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return err
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}
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*dst = pguint32{Uint: uint32(n), Status: Present}
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return nil
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}
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func (dst *pguint32) DecodeBinary(src []byte) error {
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if src == nil {
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*dst = pguint32{Status: Null}
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return nil
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}
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if len(src) != 4 {
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return fmt.Errorf("invalid length: %v", len(src))
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}
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n := binary.BigEndian.Uint32(src)
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*dst = pguint32{Uint: n, Status: Present}
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return nil
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}
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func (src pguint32) EncodeText(w io.Writer) (bool, error) {
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switch src.Status {
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case Null:
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return true, nil
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case Undefined:
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return false, errUndefined
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}
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_, err := io.WriteString(w, strconv.FormatUint(uint64(src.Uint), 10))
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return false, err
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}
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func (src pguint32) EncodeBinary(w io.Writer) (bool, error) {
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switch src.Status {
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case Null:
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return true, nil
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case Undefined:
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return false, errUndefined
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}
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_, err := pgio.WriteUint32(w, src.Uint)
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return false, err
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}
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