mirror of https://github.com/jackc/pgx.git
Move "char" to pgtype
Jack Christensen
parent
94612427ed
commit
eea6e5a64c
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@ -74,12 +74,15 @@ func (f forceBinaryEncoder) EncodeBinary(w io.Writer) error {
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func forceEncoder(e interface{}, formatCode int16) interface{} {
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switch formatCode {
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case pgx.TextFormatCode:
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return forceTextEncoder{e: e.(pgtype.TextEncoder)}
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if e, ok := e.(pgtype.TextEncoder); ok {
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return forceTextEncoder{e: e}
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}
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case pgx.BinaryFormatCode:
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return forceBinaryEncoder{e: e.(pgtype.BinaryEncoder)}
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default:
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panic("bad encoder")
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if e, ok := e.(pgtype.BinaryEncoder); ok {
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return forceBinaryEncoder{e: e.(pgtype.BinaryEncoder)}
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}
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}
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return nil
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}
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func testSuccessfulTranscode(t testing.TB, pgTypeName string, values []interface{}) {
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@ -105,9 +108,14 @@ func testSuccessfulTranscodeEqFunc(t testing.TB, pgTypeName string, values []int
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{name: "BinaryFormat", formatCode: pgx.BinaryFormatCode},
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}
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for _, fc := range formats {
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ps.FieldDescriptions[0].FormatCode = fc.formatCode
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for i, v := range values {
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for i, v := range values {
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for _, fc := range formats {
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ps.FieldDescriptions[0].FormatCode = fc.formatCode
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vEncoder := forceEncoder(v, fc.formatCode)
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if vEncoder == nil {
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t.Logf("%v does not implement %v", fc.name)
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continue
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}
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// Derefence value if it is a pointer
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derefV := v
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refVal := reflect.ValueOf(v)
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@ -0,0 +1,144 @@
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package pgtype
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import (
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"fmt"
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"io"
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"math"
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"strconv"
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"github.com/jackc/pgx/pgio"
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)
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// QChar is for PostgreSQL's special 8-bit-only "char" type more akin to the C
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// language's char type, or Go's byte type. (Note that the name in PostgreSQL
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// itself is "char", in double-quotes, and not char.) It gets used a lot in
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// PostgreSQL's system tables to hold a single ASCII character value (eg
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// pg_class.relkind). It is named Qchar for quoted char to disambiguate from SQL
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// standard type char.
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//
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// Not all possible values of QChar are representable in the text format.
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// Therefore, QChar does not implement TextEncoder and TextDecoder.
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type QChar struct {
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Int int8
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Status Status
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}
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func (dst *QChar) ConvertFrom(src interface{}) error {
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switch value := src.(type) {
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case QChar:
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*dst = value
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case int8:
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*dst = QChar{Int: value, Status: Present}
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case uint8:
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if value > math.MaxInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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*dst = QChar{Int: int8(value), Status: Present}
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case int16:
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if value < math.MinInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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if value > math.MaxInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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*dst = QChar{Int: int8(value), Status: Present}
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case uint16:
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if value > math.MaxInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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*dst = QChar{Int: int8(value), Status: Present}
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case int32:
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if value < math.MinInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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if value > math.MaxInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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*dst = QChar{Int: int8(value), Status: Present}
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case uint32:
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if value > math.MaxInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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*dst = QChar{Int: int8(value), Status: Present}
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case int64:
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if value < math.MinInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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if value > math.MaxInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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*dst = QChar{Int: int8(value), Status: Present}
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case uint64:
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if value > math.MaxInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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*dst = QChar{Int: int8(value), Status: Present}
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case int:
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if value < math.MinInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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if value > math.MaxInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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*dst = QChar{Int: int8(value), Status: Present}
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case uint:
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if value > math.MaxInt8 {
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return fmt.Errorf("%d is greater than maximum value for QChar", value)
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}
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*dst = QChar{Int: int8(value), Status: Present}
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case string:
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num, err := strconv.ParseInt(value, 10, 8)
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if err != nil {
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return err
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}
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*dst = QChar{Int: int8(num), Status: Present}
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default:
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if originalSrc, ok := underlyingNumberType(src); ok {
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return dst.ConvertFrom(originalSrc)
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}
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return fmt.Errorf("cannot convert %v to QChar", value)
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}
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return nil
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}
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func (src *QChar) AssignTo(dst interface{}) error {
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return int64AssignTo(int64(src.Int), src.Status, dst)
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}
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func (dst *QChar) DecodeBinary(r io.Reader) error {
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size, err := pgio.ReadInt32(r)
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if err != nil {
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return err
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}
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if size == -1 {
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*dst = QChar{Status: Null}
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return nil
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}
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if size != 1 {
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return fmt.Errorf(`invalid length for "char": %v`, size)
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}
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byt, err := pgio.ReadByte(r)
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if err != nil {
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return err
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}
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*dst = QChar{Int: int8(byt), Status: Present}
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return nil
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}
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func (src QChar) EncodeBinary(w io.Writer) error {
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if done, err := encodeNotPresent(w, src.Status); done {
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return err
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}
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_, err := pgio.WriteInt32(w, 1)
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if err != nil {
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return nil
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}
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return pgio.WriteByte(w, byte(src.Int))
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}
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@ -0,0 +1,140 @@
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package pgtype_test
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import (
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"math"
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"reflect"
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"testing"
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"github.com/jackc/pgx/pgtype"
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)
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func TestQCharTranscode(t *testing.T) {
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testSuccessfulTranscode(t, `"char"`, []interface{}{
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pgtype.QChar{Int: math.MinInt8, Status: pgtype.Present},
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pgtype.QChar{Int: -1, Status: pgtype.Present},
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pgtype.QChar{Int: 0, Status: pgtype.Present},
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pgtype.QChar{Int: 1, Status: pgtype.Present},
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pgtype.QChar{Int: math.MaxInt8, Status: pgtype.Present},
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pgtype.QChar{Int: 0, Status: pgtype.Null},
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})
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}
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func TestQCharConvertFrom(t *testing.T) {
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successfulTests := []struct {
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source interface{}
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result pgtype.QChar
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}{
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{source: int8(1), result: pgtype.QChar{Int: 1, Status: pgtype.Present}},
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{source: int16(1), result: pgtype.QChar{Int: 1, Status: pgtype.Present}},
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{source: int32(1), result: pgtype.QChar{Int: 1, Status: pgtype.Present}},
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{source: int64(1), result: pgtype.QChar{Int: 1, Status: pgtype.Present}},
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{source: int8(-1), result: pgtype.QChar{Int: -1, Status: pgtype.Present}},
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{source: int16(-1), result: pgtype.QChar{Int: -1, Status: pgtype.Present}},
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{source: int32(-1), result: pgtype.QChar{Int: -1, Status: pgtype.Present}},
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{source: int64(-1), result: pgtype.QChar{Int: -1, Status: pgtype.Present}},
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{source: uint8(1), result: pgtype.QChar{Int: 1, Status: pgtype.Present}},
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{source: uint16(1), result: pgtype.QChar{Int: 1, Status: pgtype.Present}},
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{source: uint32(1), result: pgtype.QChar{Int: 1, Status: pgtype.Present}},
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{source: uint64(1), result: pgtype.QChar{Int: 1, Status: pgtype.Present}},
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{source: "1", result: pgtype.QChar{Int: 1, Status: pgtype.Present}},
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{source: _int8(1), result: pgtype.QChar{Int: 1, Status: pgtype.Present}},
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}
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for i, tt := range successfulTests {
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var r pgtype.QChar
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err := r.ConvertFrom(tt.source)
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if err != nil {
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t.Errorf("%d: %v", i, err)
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}
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if r != tt.result {
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t.Errorf("%d: expected %v to convert to %v, but it was %v", i, tt.source, tt.result, r)
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}
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}
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}
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func TestQCharAssignTo(t *testing.T) {
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var i8 int8
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var i16 int16
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var i32 int32
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var i64 int64
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var i int
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var ui8 uint8
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var ui16 uint16
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var ui32 uint32
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var ui64 uint64
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var ui uint
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var pi8 *int8
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var _i8 _int8
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var _pi8 *_int8
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simpleTests := []struct {
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src pgtype.QChar
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dst interface{}
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expected interface{}
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}{
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &i8, expected: int8(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &i16, expected: int16(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &i32, expected: int32(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &i64, expected: int64(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &i, expected: int(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &ui8, expected: uint8(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &ui16, expected: uint16(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &ui32, expected: uint32(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &ui64, expected: uint64(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &ui, expected: uint(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &_i8, expected: _int8(42)},
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{src: pgtype.QChar{Int: 0, Status: pgtype.Null}, dst: &pi8, expected: ((*int8)(nil))},
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{src: pgtype.QChar{Int: 0, Status: pgtype.Null}, dst: &_pi8, expected: ((*_int8)(nil))},
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}
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for i, tt := range simpleTests {
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err := tt.src.AssignTo(tt.dst)
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if err != nil {
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t.Errorf("%d: %v", i, err)
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}
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if dst := reflect.ValueOf(tt.dst).Elem().Interface(); dst != tt.expected {
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t.Errorf("%d: expected %v to assign %v, but result was %v", i, tt.src, tt.expected, dst)
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}
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}
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pointerAllocTests := []struct {
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src pgtype.QChar
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dst interface{}
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expected interface{}
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}{
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &pi8, expected: int8(42)},
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{src: pgtype.QChar{Int: 42, Status: pgtype.Present}, dst: &_pi8, expected: _int8(42)},
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}
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for i, tt := range pointerAllocTests {
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err := tt.src.AssignTo(tt.dst)
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if err != nil {
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t.Errorf("%d: %v", i, err)
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}
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if dst := reflect.ValueOf(tt.dst).Elem().Elem().Interface(); dst != tt.expected {
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t.Errorf("%d: expected %v to assign %v, but result was %v", i, tt.src, tt.expected, dst)
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}
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}
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errorTests := []struct {
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src pgtype.QChar
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dst interface{}
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}{
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{src: pgtype.QChar{Int: -1, Status: pgtype.Present}, dst: &ui8},
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{src: pgtype.QChar{Int: -1, Status: pgtype.Present}, dst: &ui16},
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{src: pgtype.QChar{Int: -1, Status: pgtype.Present}, dst: &ui32},
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{src: pgtype.QChar{Int: -1, Status: pgtype.Present}, dst: &ui64},
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{src: pgtype.QChar{Int: -1, Status: pgtype.Present}, dst: &ui},
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{src: pgtype.QChar{Int: 0, Status: pgtype.Null}, dst: &i16},
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}
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for i, tt := range errorTests {
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err := tt.src.AssignTo(tt.dst)
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if err == nil {
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t.Errorf("%d: expected error but none was returned (%v -> %v)", i, tt.src, tt.dst)
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}
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}
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}
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