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19c6689752
Because reading a record type requires the decoder to be able to look up oid to type mapping and types such as hstore have types that are not fixed between different PostgreSQL servers it was necessary to restructure the pgtype system so all encoders and decodes take a *ConnInfo that includes oid/name/type information.
58 lines
1.4 KiB
Go
58 lines
1.4 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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// Oid (Object Identifier Type) is, according to
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// https://www.postgresql.org/docs/current/static/datatype-oid.html, used
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// internally by PostgreSQL as a primary key for various system tables. It is
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// currently implemented as an unsigned four-byte integer. Its definition can be
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// found in src/include/postgres_ext.h in the PostgreSQL sources. Because it is
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// so frequently required to be in a NOT NULL condition Oid cannot be NULL. To
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// allow for NULL Oids use OidValue.
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type Oid uint32
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func (dst *Oid) DecodeText(ci *ConnInfo, src []byte) error {
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if src == nil {
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return fmt.Errorf("cannot decode nil into Oid")
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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 = Oid(n)
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return nil
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}
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func (dst *Oid) DecodeBinary(ci *ConnInfo, src []byte) error {
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if src == nil {
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return fmt.Errorf("cannot decode nil into Oid")
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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 = Oid(n)
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return nil
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}
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func (src Oid) EncodeText(ci *ConnInfo, w io.Writer) (bool, error) {
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_, err := io.WriteString(w, strconv.FormatUint(uint64(src), 10))
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return false, err
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}
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func (src Oid) EncodeBinary(ci *ConnInfo, w io.Writer) (bool, error) {
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_, err := pgio.WriteUint32(w, uint32(src))
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return false, err
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}
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