mirror of https://github.com/jackc/pgx.git
1077 lines
36 KiB
Go
1077 lines
36 KiB
Go
package pgtype
|
|
|
|
import (
|
|
"database/sql"
|
|
"database/sql/driver"
|
|
"encoding/binary"
|
|
"errors"
|
|
"fmt"
|
|
"math"
|
|
"net"
|
|
"reflect"
|
|
"time"
|
|
)
|
|
|
|
// PostgreSQL oids for common types
|
|
const (
|
|
BoolOID = 16
|
|
ByteaOID = 17
|
|
QCharOID = 18
|
|
NameOID = 19
|
|
Int8OID = 20
|
|
Int2OID = 21
|
|
Int4OID = 23
|
|
TextOID = 25
|
|
OIDOID = 26
|
|
TIDOID = 27
|
|
XIDOID = 28
|
|
CIDOID = 29
|
|
JSONOID = 114
|
|
PointOID = 600
|
|
LsegOID = 601
|
|
PathOID = 602
|
|
BoxOID = 603
|
|
PolygonOID = 604
|
|
LineOID = 628
|
|
CIDROID = 650
|
|
CIDRArrayOID = 651
|
|
Float4OID = 700
|
|
Float8OID = 701
|
|
CircleOID = 718
|
|
CircleArrayOID = 719
|
|
UnknownOID = 705
|
|
MacaddrOID = 829
|
|
InetOID = 869
|
|
BoolArrayOID = 1000
|
|
Int2ArrayOID = 1005
|
|
Int4ArrayOID = 1007
|
|
TextArrayOID = 1009
|
|
ByteaArrayOID = 1001
|
|
BPCharArrayOID = 1014
|
|
VarcharArrayOID = 1015
|
|
Int8ArrayOID = 1016
|
|
PointArrayOID = 1017
|
|
BoxArrayOID = 1020
|
|
Float4ArrayOID = 1021
|
|
Float8ArrayOID = 1022
|
|
ACLItemOID = 1033
|
|
ACLItemArrayOID = 1034
|
|
InetArrayOID = 1041
|
|
BPCharOID = 1042
|
|
VarcharOID = 1043
|
|
DateOID = 1082
|
|
TimeOID = 1083
|
|
TimestampOID = 1114
|
|
TimestampArrayOID = 1115
|
|
DateArrayOID = 1182
|
|
TimestamptzOID = 1184
|
|
TimestamptzArrayOID = 1185
|
|
IntervalOID = 1186
|
|
NumericArrayOID = 1231
|
|
BitOID = 1560
|
|
VarbitOID = 1562
|
|
NumericOID = 1700
|
|
RecordOID = 2249
|
|
UUIDOID = 2950
|
|
UUIDArrayOID = 2951
|
|
JSONBOID = 3802
|
|
JSONBArrayOID = 3807
|
|
DaterangeOID = 3912
|
|
Int4rangeOID = 3904
|
|
NumrangeOID = 3906
|
|
TsrangeOID = 3908
|
|
TsrangeArrayOID = 3909
|
|
TstzrangeOID = 3910
|
|
TstzrangeArrayOID = 3911
|
|
Int8rangeOID = 3926
|
|
)
|
|
|
|
type InfinityModifier int8
|
|
|
|
const (
|
|
Infinity InfinityModifier = 1
|
|
None InfinityModifier = 0
|
|
NegativeInfinity InfinityModifier = -Infinity
|
|
)
|
|
|
|
func (im InfinityModifier) String() string {
|
|
switch im {
|
|
case None:
|
|
return "none"
|
|
case Infinity:
|
|
return "infinity"
|
|
case NegativeInfinity:
|
|
return "-infinity"
|
|
default:
|
|
return "invalid"
|
|
}
|
|
}
|
|
|
|
// PostgreSQL format codes
|
|
const (
|
|
TextFormatCode = 0
|
|
BinaryFormatCode = 1
|
|
)
|
|
|
|
// Value translates values to and from an internal canonical representation for the type. To actually be usable a type
|
|
// that implements Value should also implement some combination of BinaryDecoder, BinaryEncoder, TextDecoder,
|
|
// and TextEncoder.
|
|
//
|
|
// Operations that update a Value (e.g. Set, DecodeText, DecodeBinary) should entirely replace the value. e.g. Internal
|
|
// slices should be replaced not resized and reused. This allows Get and AssignTo to return a slice directly rather
|
|
// than incur a usually unnecessary copy.
|
|
type Value interface {
|
|
// Set converts and assigns src to itself. Value takes ownership of src.
|
|
Set(src interface{}) error
|
|
|
|
// Get returns the simplest representation of Value. Get may return a pointer to an internal value but it must never
|
|
// mutate that value. e.g. If Get returns a []byte Value must never change the contents of the []byte.
|
|
Get() interface{}
|
|
|
|
// AssignTo converts and assigns the Value to dst. AssignTo may a pointer to an internal value but it must never
|
|
// mutate that value. e.g. If Get returns a []byte Value must never change the contents of the []byte.
|
|
AssignTo(dst interface{}) error
|
|
}
|
|
|
|
// TypeValue is a Value where instances can represent different PostgreSQL types. This can be useful for
|
|
// representing types such as enums, composites, and arrays.
|
|
//
|
|
// In general, instances of TypeValue should not be used to directly represent a value. It should only be used as an
|
|
// encoder and decoder internal to ConnInfo.
|
|
type TypeValue interface {
|
|
Value
|
|
|
|
// NewTypeValue creates a TypeValue including references to internal type information. e.g. the list of members
|
|
// in an EnumType.
|
|
NewTypeValue() Value
|
|
|
|
// TypeName returns the PostgreSQL name of this type.
|
|
TypeName() string
|
|
}
|
|
|
|
type Codec interface {
|
|
// FormatSupported returns true if the format is supported.
|
|
FormatSupported(int16) bool
|
|
|
|
// PreferredFormat returns the preferred format.
|
|
PreferredFormat() int16
|
|
|
|
// PlanEncode returns an Encode plan for encoding value into PostgreSQL format for oid and format. If no plan can be
|
|
// found then nil is returned.
|
|
PlanEncode(ci *ConnInfo, oid uint32, format int16, value interface{}) EncodePlan
|
|
|
|
// PlanScan returns a ScanPlan for scanning a PostgreSQL value into a destination with the same type as target. If
|
|
// actualTarget is true then the returned ScanPlan may be optimized to directly scan into target. If no plan can be
|
|
// found then nil is returned.
|
|
PlanScan(ci *ConnInfo, oid uint32, format int16, target interface{}, actualTarget bool) ScanPlan
|
|
|
|
// DecodeDatabaseSQLValue returns src decoded into a value compatible with the sql.Scanner interface.
|
|
DecodeDatabaseSQLValue(ci *ConnInfo, oid uint32, format int16, src []byte) (driver.Value, error)
|
|
|
|
// DecodeValue returns src decoded into its default format.
|
|
DecodeValue(ci *ConnInfo, oid uint32, format int16, src []byte) (interface{}, error)
|
|
}
|
|
|
|
type BinaryDecoder interface {
|
|
// DecodeBinary decodes src into BinaryDecoder. If src is nil then the
|
|
// original SQL value is NULL. BinaryDecoder takes ownership of src. The
|
|
// caller MUST not use it again.
|
|
DecodeBinary(ci *ConnInfo, src []byte) error
|
|
}
|
|
|
|
type TextDecoder interface {
|
|
// DecodeText decodes src into TextDecoder. If src is nil then the original
|
|
// SQL value is NULL. TextDecoder takes ownership of src. The caller MUST not
|
|
// use it again.
|
|
DecodeText(ci *ConnInfo, src []byte) error
|
|
}
|
|
|
|
// BinaryEncoder is implemented by types that can encode themselves into the
|
|
// PostgreSQL binary wire format.
|
|
type BinaryEncoder interface {
|
|
// EncodeBinary should append the binary format of self to buf. If self is the
|
|
// SQL value NULL then append nothing and return (nil, nil). The caller of
|
|
// EncodeBinary is responsible for writing the correct NULL value or the
|
|
// length of the data written.
|
|
EncodeBinary(ci *ConnInfo, buf []byte) (newBuf []byte, err error)
|
|
}
|
|
|
|
// TextEncoder is implemented by types that can encode themselves into the
|
|
// PostgreSQL text wire format.
|
|
type TextEncoder interface {
|
|
// EncodeText should append the text format of self to buf. If self is the
|
|
// SQL value NULL then append nothing and return (nil, nil). The caller of
|
|
// EncodeText is responsible for writing the correct NULL value or the
|
|
// length of the data written.
|
|
EncodeText(ci *ConnInfo, buf []byte) (newBuf []byte, err error)
|
|
}
|
|
|
|
type nullAssignmentError struct {
|
|
dst interface{}
|
|
}
|
|
|
|
func (e *nullAssignmentError) Error() string {
|
|
return fmt.Sprintf("cannot assign NULL to %T", e.dst)
|
|
}
|
|
|
|
type DataType struct {
|
|
Value Value
|
|
|
|
textDecoder TextDecoder
|
|
binaryDecoder BinaryDecoder
|
|
|
|
Codec Codec
|
|
|
|
Name string
|
|
OID uint32
|
|
}
|
|
|
|
type ConnInfo struct {
|
|
oidToDataType map[uint32]*DataType
|
|
nameToDataType map[string]*DataType
|
|
reflectTypeToName map[reflect.Type]string
|
|
oidToFormatCode map[uint32]int16
|
|
oidToResultFormatCode map[uint32]int16
|
|
|
|
reflectTypeToDataType map[reflect.Type]*DataType
|
|
|
|
preferAssignToOverSQLScannerTypes map[reflect.Type]struct{}
|
|
}
|
|
|
|
func newConnInfo() *ConnInfo {
|
|
return &ConnInfo{
|
|
oidToDataType: make(map[uint32]*DataType),
|
|
nameToDataType: make(map[string]*DataType),
|
|
reflectTypeToName: make(map[reflect.Type]string),
|
|
oidToFormatCode: make(map[uint32]int16),
|
|
oidToResultFormatCode: make(map[uint32]int16),
|
|
preferAssignToOverSQLScannerTypes: make(map[reflect.Type]struct{}),
|
|
}
|
|
}
|
|
|
|
func NewConnInfo() *ConnInfo {
|
|
ci := newConnInfo()
|
|
|
|
ci.RegisterDataType(DataType{Value: &ACLItemArray{}, Name: "_aclitem", OID: ACLItemArrayOID})
|
|
ci.RegisterDataType(DataType{Name: "_bool", OID: BoolArrayOID, Codec: &ArrayCodec{ElementCodec: BoolCodec{}, ElementOID: BoolOID}})
|
|
ci.RegisterDataType(DataType{Name: "_bpchar", OID: BPCharArrayOID, Codec: &ArrayCodec{ElementCodec: TextCodec{}, ElementOID: BPCharOID}})
|
|
ci.RegisterDataType(DataType{Value: &ByteaArray{}, Name: "_bytea", OID: ByteaArrayOID})
|
|
ci.RegisterDataType(DataType{Value: &CIDRArray{}, Name: "_cidr", OID: CIDRArrayOID})
|
|
ci.RegisterDataType(DataType{Value: &DateArray{}, Name: "_date", OID: DateArrayOID})
|
|
ci.RegisterDataType(DataType{Value: &Float4Array{}, Name: "_float4", OID: Float4ArrayOID})
|
|
ci.RegisterDataType(DataType{Value: &Float8Array{}, Name: "_float8", OID: Float8ArrayOID})
|
|
ci.RegisterDataType(DataType{Value: &InetArray{}, Name: "_inet", OID: InetArrayOID})
|
|
ci.RegisterDataType(DataType{Name: "_int2", OID: Int2ArrayOID, Codec: &ArrayCodec{ElementCodec: Int2Codec{}, ElementOID: Int2OID}})
|
|
ci.RegisterDataType(DataType{Name: "_int4", OID: Int4ArrayOID, Codec: &ArrayCodec{ElementCodec: Int4Codec{}, ElementOID: Int4OID}})
|
|
ci.RegisterDataType(DataType{Name: "_int8", OID: Int8ArrayOID, Codec: &ArrayCodec{ElementCodec: Int8Codec{}, ElementOID: Int8OID}})
|
|
ci.RegisterDataType(DataType{Name: "_box", OID: BoxArrayOID, Codec: &ArrayCodec{ElementCodec: BoxCodec{}, ElementOID: BoxOID}})
|
|
ci.RegisterDataType(DataType{Name: "_circle", OID: CircleArrayOID, Codec: &ArrayCodec{ElementCodec: CircleCodec{}, ElementOID: CircleOID}})
|
|
ci.RegisterDataType(DataType{Name: "_point", OID: PointArrayOID, Codec: &ArrayCodec{ElementCodec: PointCodec{}, ElementOID: PointOID}})
|
|
ci.RegisterDataType(DataType{Value: &NumericArray{}, Name: "_numeric", OID: NumericArrayOID})
|
|
ci.RegisterDataType(DataType{Name: "_text", OID: TextArrayOID, Codec: &ArrayCodec{ElementCodec: TextCodec{}, ElementOID: TextOID}})
|
|
ci.RegisterDataType(DataType{Value: &TimestampArray{}, Name: "_timestamp", OID: TimestampArrayOID})
|
|
ci.RegisterDataType(DataType{Value: &TimestamptzArray{}, Name: "_timestamptz", OID: TimestamptzArrayOID})
|
|
ci.RegisterDataType(DataType{Value: &UUIDArray{}, Name: "_uuid", OID: UUIDArrayOID})
|
|
ci.RegisterDataType(DataType{Name: "_varchar", OID: VarcharArrayOID, Codec: &ArrayCodec{ElementCodec: TextCodec{}, ElementOID: VarcharOID}})
|
|
ci.RegisterDataType(DataType{Value: &ACLItem{}, Name: "aclitem", OID: ACLItemOID})
|
|
ci.RegisterDataType(DataType{Value: &Bit{}, Name: "bit", OID: BitOID})
|
|
ci.RegisterDataType(DataType{Name: "bool", OID: BoolOID, Codec: BoolCodec{}})
|
|
ci.RegisterDataType(DataType{Name: "box", OID: BoxOID, Codec: BoxCodec{}})
|
|
ci.RegisterDataType(DataType{Name: "bpchar", OID: BPCharOID, Codec: TextCodec{}})
|
|
ci.RegisterDataType(DataType{Value: &Bytea{}, Name: "bytea", OID: ByteaOID})
|
|
ci.RegisterDataType(DataType{Value: &QChar{}, Name: "char", OID: QCharOID})
|
|
ci.RegisterDataType(DataType{Value: &CID{}, Name: "cid", OID: CIDOID})
|
|
ci.RegisterDataType(DataType{Value: &CIDR{}, Name: "cidr", OID: CIDROID})
|
|
ci.RegisterDataType(DataType{Name: "circle", OID: CircleOID, Codec: CircleCodec{}})
|
|
ci.RegisterDataType(DataType{Value: &Date{}, Name: "date", OID: DateOID})
|
|
// ci.RegisterDataType(DataType{Value: &Daterange{}, Name: "daterange", OID: DaterangeOID})
|
|
ci.RegisterDataType(DataType{Value: &Float4{}, Name: "float4", OID: Float4OID})
|
|
ci.RegisterDataType(DataType{Value: &Float8{}, Name: "float8", OID: Float8OID})
|
|
ci.RegisterDataType(DataType{Value: &Inet{}, Name: "inet", OID: InetOID})
|
|
ci.RegisterDataType(DataType{Name: "int2", OID: Int2OID, Codec: Int2Codec{}})
|
|
ci.RegisterDataType(DataType{Name: "int4", OID: Int4OID, Codec: Int4Codec{}})
|
|
// ci.RegisterDataType(DataType{Value: &Int4range{}, Name: "int4range", OID: Int4rangeOID})
|
|
ci.RegisterDataType(DataType{Name: "int8", OID: Int8OID, Codec: Int8Codec{}})
|
|
// ci.RegisterDataType(DataType{Value: &Int8range{}, Name: "int8range", OID: Int8rangeOID})
|
|
ci.RegisterDataType(DataType{Value: &Interval{}, Name: "interval", OID: IntervalOID})
|
|
ci.RegisterDataType(DataType{Value: &JSON{}, Name: "json", OID: JSONOID})
|
|
ci.RegisterDataType(DataType{Value: &JSONB{}, Name: "jsonb", OID: JSONBOID})
|
|
ci.RegisterDataType(DataType{Value: &JSONBArray{}, Name: "_jsonb", OID: JSONBArrayOID})
|
|
ci.RegisterDataType(DataType{Value: &Line{}, Name: "line", OID: LineOID})
|
|
ci.RegisterDataType(DataType{Value: &Lseg{}, Name: "lseg", OID: LsegOID})
|
|
ci.RegisterDataType(DataType{Value: &Macaddr{}, Name: "macaddr", OID: MacaddrOID})
|
|
ci.RegisterDataType(DataType{Name: "name", OID: NameOID, Codec: TextCodec{}})
|
|
ci.RegisterDataType(DataType{Value: &Numeric{}, Name: "numeric", OID: NumericOID})
|
|
// ci.RegisterDataType(DataType{Value: &Numrange{}, Name: "numrange", OID: NumrangeOID})
|
|
ci.RegisterDataType(DataType{Value: &OIDValue{}, Name: "oid", OID: OIDOID})
|
|
ci.RegisterDataType(DataType{Value: &Path{}, Name: "path", OID: PathOID})
|
|
ci.RegisterDataType(DataType{Name: "point", OID: PointOID, Codec: PointCodec{}})
|
|
ci.RegisterDataType(DataType{Value: &Polygon{}, Name: "polygon", OID: PolygonOID})
|
|
// ci.RegisterDataType(DataType{Value: &Record{}, Name: "record", OID: RecordOID})
|
|
ci.RegisterDataType(DataType{Name: "text", OID: TextOID, Codec: TextCodec{}})
|
|
ci.RegisterDataType(DataType{Value: &TID{}, Name: "tid", OID: TIDOID})
|
|
ci.RegisterDataType(DataType{Value: &Time{}, Name: "time", OID: TimeOID})
|
|
ci.RegisterDataType(DataType{Value: &Timestamp{}, Name: "timestamp", OID: TimestampOID})
|
|
ci.RegisterDataType(DataType{Value: &Timestamptz{}, Name: "timestamptz", OID: TimestamptzOID})
|
|
// ci.RegisterDataType(DataType{Value: &Tsrange{}, Name: "tsrange", OID: TsrangeOID})
|
|
// ci.RegisterDataType(DataType{Value: &TsrangeArray{}, Name: "_tsrange", OID: TsrangeArrayOID})
|
|
// ci.RegisterDataType(DataType{Value: &Tstzrange{}, Name: "tstzrange", OID: TstzrangeOID})
|
|
// ci.RegisterDataType(DataType{Value: &TstzrangeArray{}, Name: "_tstzrange", OID: TstzrangeArrayOID})
|
|
ci.RegisterDataType(DataType{Name: "unknown", OID: UnknownOID, Codec: TextCodec{}})
|
|
ci.RegisterDataType(DataType{Value: &UUID{}, Name: "uuid", OID: UUIDOID})
|
|
ci.RegisterDataType(DataType{Value: &Varbit{}, Name: "varbit", OID: VarbitOID})
|
|
ci.RegisterDataType(DataType{Name: "varchar", OID: VarcharOID, Codec: TextCodec{}})
|
|
ci.RegisterDataType(DataType{Value: &XID{}, Name: "xid", OID: XIDOID})
|
|
|
|
registerDefaultPgTypeVariants := func(name, arrayName string, value interface{}) {
|
|
ci.RegisterDefaultPgType(value, name)
|
|
valueType := reflect.TypeOf(value)
|
|
|
|
ci.RegisterDefaultPgType(reflect.New(valueType).Interface(), name)
|
|
|
|
sliceType := reflect.SliceOf(valueType)
|
|
ci.RegisterDefaultPgType(reflect.MakeSlice(sliceType, 0, 0).Interface(), arrayName)
|
|
|
|
ci.RegisterDefaultPgType(reflect.New(sliceType).Interface(), arrayName)
|
|
}
|
|
|
|
// Integer types that directly map to a PostgreSQL type
|
|
registerDefaultPgTypeVariants("int2", "_int2", int16(0))
|
|
registerDefaultPgTypeVariants("int4", "_int4", int32(0))
|
|
registerDefaultPgTypeVariants("int8", "_int8", int64(0))
|
|
|
|
// Integer types that do not have a direct match to a PostgreSQL type
|
|
registerDefaultPgTypeVariants("int8", "_int8", uint16(0))
|
|
registerDefaultPgTypeVariants("int8", "_int8", uint32(0))
|
|
registerDefaultPgTypeVariants("int8", "_int8", uint64(0))
|
|
registerDefaultPgTypeVariants("int8", "_int8", int(0))
|
|
registerDefaultPgTypeVariants("int8", "_int8", uint(0))
|
|
|
|
registerDefaultPgTypeVariants("float4", "_float4", float32(0))
|
|
registerDefaultPgTypeVariants("float8", "_float8", float64(0))
|
|
|
|
registerDefaultPgTypeVariants("bool", "_bool", false)
|
|
registerDefaultPgTypeVariants("timestamptz", "_timestamptz", time.Time{})
|
|
registerDefaultPgTypeVariants("text", "_text", "")
|
|
registerDefaultPgTypeVariants("bytea", "_bytea", []byte(nil))
|
|
|
|
registerDefaultPgTypeVariants("inet", "_inet", net.IP{})
|
|
ci.RegisterDefaultPgType((*net.IPNet)(nil), "cidr")
|
|
ci.RegisterDefaultPgType([]*net.IPNet(nil), "_cidr")
|
|
|
|
return ci
|
|
}
|
|
|
|
func (ci *ConnInfo) RegisterDataType(t DataType) {
|
|
if t.Value != nil {
|
|
t.Value = NewValue(t.Value)
|
|
}
|
|
|
|
ci.oidToDataType[t.OID] = &t
|
|
ci.nameToDataType[t.Name] = &t
|
|
|
|
{
|
|
var formatCode int16
|
|
if t.Codec != nil {
|
|
formatCode = t.Codec.PreferredFormat()
|
|
} else if _, ok := t.Value.(BinaryEncoder); ok {
|
|
formatCode = BinaryFormatCode
|
|
}
|
|
ci.oidToFormatCode[t.OID] = formatCode
|
|
}
|
|
|
|
if d, ok := t.Value.(TextDecoder); ok {
|
|
t.textDecoder = d
|
|
}
|
|
|
|
if d, ok := t.Value.(BinaryDecoder); ok {
|
|
t.binaryDecoder = d
|
|
}
|
|
|
|
ci.reflectTypeToDataType = nil // Invalidated by type registration
|
|
}
|
|
|
|
// RegisterDefaultPgType registers a mapping of a Go type to a PostgreSQL type name. Typically the data type to be
|
|
// encoded or decoded is determined by the PostgreSQL OID. But if the OID of a value to be encoded or decoded is
|
|
// unknown, this additional mapping will be used by DataTypeForValue to determine a suitable data type.
|
|
func (ci *ConnInfo) RegisterDefaultPgType(value interface{}, name string) {
|
|
ci.reflectTypeToName[reflect.TypeOf(value)] = name
|
|
ci.reflectTypeToDataType = nil // Invalidated by registering a default type
|
|
}
|
|
|
|
func (ci *ConnInfo) DataTypeForOID(oid uint32) (*DataType, bool) {
|
|
dt, ok := ci.oidToDataType[oid]
|
|
return dt, ok
|
|
}
|
|
|
|
func (ci *ConnInfo) DataTypeForName(name string) (*DataType, bool) {
|
|
dt, ok := ci.nameToDataType[name]
|
|
return dt, ok
|
|
}
|
|
|
|
func (ci *ConnInfo) buildReflectTypeToDataType() {
|
|
ci.reflectTypeToDataType = make(map[reflect.Type]*DataType)
|
|
|
|
for _, dt := range ci.oidToDataType {
|
|
if dt.Value != nil {
|
|
if _, is := dt.Value.(TypeValue); !is {
|
|
ci.reflectTypeToDataType[reflect.ValueOf(dt.Value).Type()] = dt
|
|
}
|
|
}
|
|
}
|
|
|
|
for reflectType, name := range ci.reflectTypeToName {
|
|
if dt, ok := ci.nameToDataType[name]; ok {
|
|
ci.reflectTypeToDataType[reflectType] = dt
|
|
}
|
|
}
|
|
}
|
|
|
|
// DataTypeForValue finds a data type suitable for v. Use RegisterDataType to register types that can encode and decode
|
|
// themselves. Use RegisterDefaultPgType to register that can be handled by a registered data type.
|
|
func (ci *ConnInfo) DataTypeForValue(v interface{}) (*DataType, bool) {
|
|
if ci.reflectTypeToDataType == nil {
|
|
ci.buildReflectTypeToDataType()
|
|
}
|
|
|
|
if tv, ok := v.(TypeValue); ok {
|
|
dt, ok := ci.nameToDataType[tv.TypeName()]
|
|
return dt, ok
|
|
}
|
|
|
|
dt, ok := ci.reflectTypeToDataType[reflect.TypeOf(v)]
|
|
return dt, ok
|
|
}
|
|
|
|
func (ci *ConnInfo) FormatCodeForOID(oid uint32) int16 {
|
|
fc, ok := ci.oidToFormatCode[oid]
|
|
if ok {
|
|
return fc
|
|
}
|
|
return TextFormatCode
|
|
}
|
|
|
|
// PreferAssignToOverSQLScannerForType makes a sql.Scanner type use the AssignTo scan path instead of sql.Scanner.
|
|
// This is primarily for efficient integration with 3rd party numeric and UUID types.
|
|
func (ci *ConnInfo) PreferAssignToOverSQLScannerForType(value interface{}) {
|
|
ci.preferAssignToOverSQLScannerTypes[reflect.TypeOf(value)] = struct{}{}
|
|
}
|
|
|
|
// EncodePlan is a precompiled plan to encode a particular type into a particular OID and format.
|
|
type EncodePlan interface {
|
|
// Encode appends the encoded bytes of value to buf. If value is the SQL value NULL then append nothing and return
|
|
// (nil, nil). The caller of Encode is responsible for writing the correct NULL value or the length of the data
|
|
// written.
|
|
Encode(value interface{}, buf []byte) (newBuf []byte, err error)
|
|
}
|
|
|
|
// ScanPlan is a precompiled plan to scan into a type of destination.
|
|
type ScanPlan interface {
|
|
// Scan scans src into dst. If the dst type has changed in an incompatible way a ScanPlan should automatically
|
|
// replan and scan.
|
|
Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error
|
|
}
|
|
|
|
type scanPlanDstResultDecoder struct{}
|
|
|
|
func (scanPlanDstResultDecoder) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
type scanPlanDstBinaryDecoder struct{}
|
|
|
|
func (scanPlanDstBinaryDecoder) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
if d, ok := (dst).(BinaryDecoder); ok {
|
|
return d.DecodeBinary(ci, src)
|
|
}
|
|
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
type scanPlanDstTextDecoder struct{}
|
|
|
|
func (plan scanPlanDstTextDecoder) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
if d, ok := (dst).(TextDecoder); ok {
|
|
return d.DecodeText(ci, src)
|
|
}
|
|
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
type scanPlanDataTypeSQLScanner DataType
|
|
|
|
func (plan *scanPlanDataTypeSQLScanner) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
scanner, ok := dst.(sql.Scanner)
|
|
if !ok {
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
dt := (*DataType)(plan)
|
|
if dt.Codec != nil {
|
|
sqlValue, err := dt.Codec.DecodeDatabaseSQLValue(ci, oid, formatCode, src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return scanner.Scan(sqlValue)
|
|
}
|
|
var err error
|
|
switch formatCode {
|
|
case BinaryFormatCode:
|
|
err = dt.binaryDecoder.DecodeBinary(ci, src)
|
|
case TextFormatCode:
|
|
err = dt.textDecoder.DecodeText(ci, src)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
sqlSrc, err := DatabaseSQLValue(ci, dt.Value)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return scanner.Scan(sqlSrc)
|
|
}
|
|
|
|
type scanPlanDataTypeAssignTo DataType
|
|
|
|
func (plan *scanPlanDataTypeAssignTo) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
dt := (*DataType)(plan)
|
|
var err error
|
|
|
|
switch formatCode {
|
|
case BinaryFormatCode:
|
|
if dt.binaryDecoder == nil {
|
|
return fmt.Errorf("dt.binaryDecoder is nil")
|
|
}
|
|
err = dt.binaryDecoder.DecodeBinary(ci, src)
|
|
case TextFormatCode:
|
|
if dt.textDecoder == nil {
|
|
return fmt.Errorf("dt.textDecoder is nil")
|
|
}
|
|
err = dt.textDecoder.DecodeText(ci, src)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
assignToErr := dt.Value.AssignTo(dst)
|
|
if assignToErr == nil {
|
|
return nil
|
|
}
|
|
|
|
if dstPtr, ok := dst.(*interface{}); ok {
|
|
*dstPtr = dt.Value.Get()
|
|
return nil
|
|
}
|
|
|
|
// assignToErr might have failed because the type of destination has changed
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
if newPlan, sameType := newPlan.(*scanPlanDataTypeAssignTo); !sameType {
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
return assignToErr
|
|
}
|
|
|
|
type scanPlanSQLScanner struct{}
|
|
|
|
func (scanPlanSQLScanner) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
scanner := dst.(sql.Scanner)
|
|
if src == nil {
|
|
// This is necessary because interface value []byte:nil does not equal nil:nil for the binary format path and the
|
|
// text format path would be converted to empty string.
|
|
return scanner.Scan(nil)
|
|
} else if formatCode == BinaryFormatCode {
|
|
return scanner.Scan(src)
|
|
} else {
|
|
return scanner.Scan(string(src))
|
|
}
|
|
}
|
|
|
|
type scanPlanReflection struct{}
|
|
|
|
func (scanPlanReflection) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
// We might be given a pointer to something that implements the decoder interface(s),
|
|
// even though the pointer itself doesn't.
|
|
refVal := reflect.ValueOf(dst)
|
|
if refVal.Kind() == reflect.Ptr && refVal.Type().Elem().Kind() == reflect.Ptr {
|
|
// If the database returned NULL, then we set dest as nil to indicate that.
|
|
if src == nil {
|
|
nilPtr := reflect.Zero(refVal.Type().Elem())
|
|
refVal.Elem().Set(nilPtr)
|
|
return nil
|
|
}
|
|
|
|
// We need to allocate an element, and set the destination to it
|
|
// Then we can retry as that element.
|
|
elemPtr := reflect.New(refVal.Type().Elem().Elem())
|
|
refVal.Elem().Set(elemPtr)
|
|
|
|
plan := ci.PlanScan(oid, formatCode, elemPtr.Interface())
|
|
return plan.Scan(ci, oid, formatCode, src, elemPtr.Interface())
|
|
}
|
|
|
|
return scanUnknownType(oid, formatCode, src, dst)
|
|
}
|
|
|
|
type scanPlanBinaryInt64 struct{}
|
|
|
|
func (scanPlanBinaryInt64) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
if src == nil {
|
|
return fmt.Errorf("cannot scan null into %T", dst)
|
|
}
|
|
|
|
if len(src) != 8 {
|
|
return fmt.Errorf("invalid length for int8: %v", len(src))
|
|
}
|
|
|
|
if p, ok := (dst).(*int64); ok {
|
|
*p = int64(binary.BigEndian.Uint64(src))
|
|
return nil
|
|
}
|
|
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
type scanPlanBinaryFloat32 struct{}
|
|
|
|
func (scanPlanBinaryFloat32) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
if src == nil {
|
|
return fmt.Errorf("cannot scan null into %T", dst)
|
|
}
|
|
|
|
if len(src) != 4 {
|
|
return fmt.Errorf("invalid length for int4: %v", len(src))
|
|
}
|
|
|
|
if p, ok := (dst).(*float32); ok {
|
|
n := int32(binary.BigEndian.Uint32(src))
|
|
*p = float32(math.Float32frombits(uint32(n)))
|
|
return nil
|
|
}
|
|
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
type scanPlanBinaryFloat64 struct{}
|
|
|
|
func (scanPlanBinaryFloat64) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
if src == nil {
|
|
return fmt.Errorf("cannot scan null into %T", dst)
|
|
}
|
|
|
|
if len(src) != 8 {
|
|
return fmt.Errorf("invalid length for int8: %v", len(src))
|
|
}
|
|
|
|
if p, ok := (dst).(*float64); ok {
|
|
n := int64(binary.BigEndian.Uint64(src))
|
|
*p = float64(math.Float64frombits(uint64(n)))
|
|
return nil
|
|
}
|
|
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
type scanPlanBinaryBytes struct{}
|
|
|
|
func (scanPlanBinaryBytes) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
if p, ok := (dst).(*[]byte); ok {
|
|
*p = src
|
|
return nil
|
|
}
|
|
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
type scanPlanString struct{}
|
|
|
|
func (scanPlanString) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
if src == nil {
|
|
return fmt.Errorf("cannot scan null into %T", dst)
|
|
}
|
|
|
|
if p, ok := (dst).(*string); ok {
|
|
*p = string(src)
|
|
return nil
|
|
}
|
|
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
type pointerPointerScanPlan struct {
|
|
dstType reflect.Type
|
|
next ScanPlan
|
|
}
|
|
|
|
func (plan *pointerPointerScanPlan) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
if plan.dstType != reflect.TypeOf(dst) {
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
el := reflect.ValueOf(dst).Elem()
|
|
if src == nil {
|
|
el.Set(reflect.Zero(el.Type()))
|
|
return nil
|
|
}
|
|
|
|
el.Set(reflect.New(el.Type().Elem()))
|
|
return plan.next.Scan(ci, oid, formatCode, src, el.Interface())
|
|
}
|
|
|
|
func tryPointerPointerScanPlan(dst interface{}) (plan *pointerPointerScanPlan, nextDst interface{}, ok bool) {
|
|
if dstValue := reflect.ValueOf(dst); dstValue.Kind() == reflect.Ptr {
|
|
elemValue := dstValue.Elem()
|
|
if elemValue.Kind() == reflect.Ptr {
|
|
plan = &pointerPointerScanPlan{dstType: dstValue.Type()}
|
|
return plan, reflect.Zero(elemValue.Type()).Interface(), true
|
|
}
|
|
}
|
|
|
|
return nil, nil, false
|
|
}
|
|
|
|
var elemKindToBasePointerTypes map[reflect.Kind]reflect.Type = map[reflect.Kind]reflect.Type{
|
|
reflect.Int: reflect.TypeOf(new(int)),
|
|
reflect.Int8: reflect.TypeOf(new(int8)),
|
|
reflect.Int16: reflect.TypeOf(new(int16)),
|
|
reflect.Int32: reflect.TypeOf(new(int32)),
|
|
reflect.Int64: reflect.TypeOf(new(int64)),
|
|
reflect.Uint: reflect.TypeOf(new(uint)),
|
|
reflect.Uint8: reflect.TypeOf(new(uint8)),
|
|
reflect.Uint16: reflect.TypeOf(new(uint16)),
|
|
reflect.Uint32: reflect.TypeOf(new(uint32)),
|
|
reflect.Uint64: reflect.TypeOf(new(uint64)),
|
|
reflect.Float32: reflect.TypeOf(new(float32)),
|
|
reflect.Float64: reflect.TypeOf(new(float64)),
|
|
reflect.String: reflect.TypeOf(new(string)),
|
|
}
|
|
|
|
type baseTypeScanPlan struct {
|
|
dstType reflect.Type
|
|
nextDstType reflect.Type
|
|
next ScanPlan
|
|
}
|
|
|
|
func (plan *baseTypeScanPlan) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
if plan.dstType != reflect.TypeOf(dst) {
|
|
newPlan := ci.PlanScan(oid, formatCode, dst)
|
|
return newPlan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
return plan.next.Scan(ci, oid, formatCode, src, reflect.ValueOf(dst).Convert(plan.nextDstType).Interface())
|
|
}
|
|
|
|
func tryBaseTypeScanPlan(dst interface{}) (plan *baseTypeScanPlan, nextDst interface{}, ok bool) {
|
|
dstValue := reflect.ValueOf(dst)
|
|
|
|
if dstValue.Kind() == reflect.Ptr {
|
|
elemValue := dstValue.Elem()
|
|
nextDstType := elemKindToBasePointerTypes[elemValue.Kind()]
|
|
if nextDstType != nil && dstValue.Type() != nextDstType {
|
|
return &baseTypeScanPlan{dstType: dstValue.Type(), nextDstType: nextDstType}, dstValue.Convert(nextDstType).Interface(), true
|
|
}
|
|
}
|
|
|
|
return nil, nil, false
|
|
}
|
|
|
|
type pointerEmptyInterfaceScanPlan struct {
|
|
codec Codec
|
|
}
|
|
|
|
func (plan *pointerEmptyInterfaceScanPlan) Scan(ci *ConnInfo, oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
value, err := plan.codec.DecodeValue(ci, oid, formatCode, src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
ptrAny := dst.(*interface{})
|
|
*ptrAny = value
|
|
|
|
return nil
|
|
}
|
|
|
|
// PlanScan prepares a plan to scan a value into dst.
|
|
func (ci *ConnInfo) PlanScan(oid uint32, formatCode int16, dst interface{}) ScanPlan {
|
|
switch formatCode {
|
|
case BinaryFormatCode:
|
|
switch dst.(type) {
|
|
case *string:
|
|
switch oid {
|
|
case TextOID, VarcharOID:
|
|
return scanPlanString{}
|
|
}
|
|
case *int64:
|
|
if oid == Int8OID {
|
|
return scanPlanBinaryInt64{}
|
|
}
|
|
case *float32:
|
|
if oid == Float4OID {
|
|
return scanPlanBinaryFloat32{}
|
|
}
|
|
case *float64:
|
|
if oid == Float8OID {
|
|
return scanPlanBinaryFloat64{}
|
|
}
|
|
case *[]byte:
|
|
switch oid {
|
|
case ByteaOID, TextOID, VarcharOID, JSONOID:
|
|
return scanPlanBinaryBytes{}
|
|
}
|
|
case BinaryDecoder:
|
|
return scanPlanDstBinaryDecoder{}
|
|
}
|
|
case TextFormatCode:
|
|
switch dst.(type) {
|
|
case *string:
|
|
return scanPlanString{}
|
|
case *[]byte:
|
|
if oid != ByteaOID {
|
|
return scanPlanBinaryBytes{}
|
|
}
|
|
case TextDecoder:
|
|
return scanPlanDstTextDecoder{}
|
|
case TextScanner:
|
|
return scanPlanTextAnyToTextScanner{}
|
|
}
|
|
}
|
|
|
|
var dt *DataType
|
|
|
|
if oid == 0 {
|
|
if dataType, ok := ci.DataTypeForValue(dst); ok {
|
|
dt = dataType
|
|
}
|
|
} else {
|
|
if dataType, ok := ci.DataTypeForOID(oid); ok {
|
|
dt = dataType
|
|
}
|
|
}
|
|
|
|
if dt != nil && dt.Codec != nil {
|
|
if plan := dt.Codec.PlanScan(ci, oid, formatCode, dst, false); plan != nil {
|
|
return plan
|
|
}
|
|
|
|
if pointerPointerPlan, nextDst, ok := tryPointerPointerScanPlan(dst); ok {
|
|
if nextPlan := ci.PlanScan(oid, formatCode, nextDst); nextPlan != nil {
|
|
pointerPointerPlan.next = nextPlan
|
|
return pointerPointerPlan
|
|
}
|
|
}
|
|
|
|
if baseTypePlan, nextDst, ok := tryBaseTypeScanPlan(dst); ok {
|
|
if nextPlan := ci.PlanScan(oid, formatCode, nextDst); nextPlan != nil {
|
|
baseTypePlan.next = nextPlan
|
|
return baseTypePlan
|
|
}
|
|
}
|
|
|
|
if _, ok := dst.(*interface{}); ok {
|
|
return &pointerEmptyInterfaceScanPlan{codec: dt.Codec}
|
|
}
|
|
}
|
|
|
|
if dt != nil {
|
|
if _, ok := dst.(sql.Scanner); ok {
|
|
if _, found := ci.preferAssignToOverSQLScannerTypes[reflect.TypeOf(dst)]; !found {
|
|
return (*scanPlanDataTypeSQLScanner)(dt)
|
|
}
|
|
}
|
|
return (*scanPlanDataTypeAssignTo)(dt)
|
|
}
|
|
|
|
if _, ok := dst.(sql.Scanner); ok {
|
|
return scanPlanSQLScanner{}
|
|
}
|
|
|
|
return scanPlanReflection{}
|
|
}
|
|
|
|
func (ci *ConnInfo) Scan(oid uint32, formatCode int16, src []byte, dst interface{}) error {
|
|
if dst == nil {
|
|
return nil
|
|
}
|
|
|
|
plan := ci.PlanScan(oid, formatCode, dst)
|
|
return plan.Scan(ci, oid, formatCode, src, dst)
|
|
}
|
|
|
|
func scanUnknownType(oid uint32, formatCode int16, buf []byte, dest interface{}) error {
|
|
switch dest := dest.(type) {
|
|
case *string:
|
|
if formatCode == BinaryFormatCode {
|
|
return fmt.Errorf("unknown oid %d in binary format cannot be scanned into %T", oid, dest)
|
|
}
|
|
*dest = string(buf)
|
|
return nil
|
|
case *[]byte:
|
|
*dest = buf
|
|
return nil
|
|
default:
|
|
if nextDst, retry := GetAssignToDstType(dest); retry {
|
|
return scanUnknownType(oid, formatCode, buf, nextDst)
|
|
}
|
|
return fmt.Errorf("unknown oid %d cannot be scanned into %T", oid, dest)
|
|
}
|
|
}
|
|
|
|
// NewValue returns a new instance of the same type as v.
|
|
func NewValue(v Value) Value {
|
|
if tv, ok := v.(TypeValue); ok {
|
|
return tv.NewTypeValue()
|
|
} else {
|
|
return reflect.New(reflect.ValueOf(v).Elem().Type()).Interface().(Value)
|
|
}
|
|
}
|
|
|
|
var ErrScanTargetTypeChanged = errors.New("scan target type changed")
|
|
|
|
func codecScan(codec Codec, ci *ConnInfo, oid uint32, format int16, src []byte, dst interface{}) error {
|
|
scanPlan := codec.PlanScan(ci, oid, format, dst, true)
|
|
if scanPlan == nil {
|
|
return fmt.Errorf("PlanScan did not find a plan")
|
|
}
|
|
return scanPlan.Scan(ci, oid, format, src, dst)
|
|
}
|
|
|
|
func codecDecodeToTextFormat(codec Codec, ci *ConnInfo, oid uint32, format int16, src []byte) (driver.Value, error) {
|
|
if format == TextFormatCode {
|
|
return string(src), nil
|
|
} else {
|
|
value, err := codec.DecodeValue(ci, oid, format, src)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
buf, err := ci.Encode(oid, TextFormatCode, value, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return string(buf), nil
|
|
}
|
|
}
|
|
|
|
// PlanEncode returns an Encode plan for encoding value into PostgreSQL format for oid and format. If no plan can be
|
|
// found then nil is returned.
|
|
func (ci *ConnInfo) PlanEncode(oid uint32, format int16, value interface{}) EncodePlan {
|
|
|
|
var dt *DataType
|
|
|
|
if oid == 0 {
|
|
if dataType, ok := ci.DataTypeForValue(value); ok {
|
|
dt = dataType
|
|
}
|
|
} else {
|
|
if dataType, ok := ci.DataTypeForOID(oid); ok {
|
|
dt = dataType
|
|
}
|
|
}
|
|
|
|
if dt != nil && dt.Codec != nil {
|
|
if plan := dt.Codec.PlanEncode(ci, oid, format, value); plan != nil {
|
|
return plan
|
|
}
|
|
|
|
if derefPointerPlan, nextValue, ok := tryDerefPointerEncodePlan(value); ok {
|
|
if nextPlan := ci.PlanEncode(oid, format, nextValue); nextPlan != nil {
|
|
derefPointerPlan.next = nextPlan
|
|
return derefPointerPlan
|
|
}
|
|
}
|
|
|
|
if baseTypePlan, nextValue, ok := tryBaseTypeEncodePlan(value); ok {
|
|
if nextPlan := ci.PlanEncode(oid, format, nextValue); nextPlan != nil {
|
|
baseTypePlan.next = nextPlan
|
|
return baseTypePlan
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
type derefPointerEncodePlan struct {
|
|
next EncodePlan
|
|
}
|
|
|
|
func (plan *derefPointerEncodePlan) Encode(value interface{}, buf []byte) (newBuf []byte, err error) {
|
|
ptr := reflect.ValueOf(value)
|
|
|
|
if ptr.IsNil() {
|
|
return nil, nil
|
|
}
|
|
|
|
return plan.next.Encode(ptr.Elem().Interface(), buf)
|
|
}
|
|
|
|
func tryDerefPointerEncodePlan(value interface{}) (plan *derefPointerEncodePlan, nextValue interface{}, ok bool) {
|
|
if valueType := reflect.TypeOf(value); valueType.Kind() == reflect.Ptr {
|
|
return &derefPointerEncodePlan{}, reflect.New(valueType.Elem()).Elem().Interface(), true
|
|
}
|
|
|
|
return nil, nil, false
|
|
}
|
|
|
|
var kindToBaseTypes map[reflect.Kind]reflect.Type = map[reflect.Kind]reflect.Type{
|
|
reflect.Int: reflect.TypeOf(int(0)),
|
|
reflect.Int8: reflect.TypeOf(int8(0)),
|
|
reflect.Int16: reflect.TypeOf(int16(0)),
|
|
reflect.Int32: reflect.TypeOf(int32(0)),
|
|
reflect.Int64: reflect.TypeOf(int64(0)),
|
|
reflect.Uint: reflect.TypeOf(uint(0)),
|
|
reflect.Uint8: reflect.TypeOf(uint8(0)),
|
|
reflect.Uint16: reflect.TypeOf(uint16(0)),
|
|
reflect.Uint32: reflect.TypeOf(uint32(0)),
|
|
reflect.Uint64: reflect.TypeOf(uint64(0)),
|
|
reflect.Float32: reflect.TypeOf(float32(0)),
|
|
reflect.Float64: reflect.TypeOf(float64(0)),
|
|
reflect.String: reflect.TypeOf(""),
|
|
}
|
|
|
|
type baseTypeEncodePlan struct {
|
|
nextValueType reflect.Type
|
|
next EncodePlan
|
|
}
|
|
|
|
func (plan *baseTypeEncodePlan) Encode(value interface{}, buf []byte) (newBuf []byte, err error) {
|
|
return plan.next.Encode(reflect.ValueOf(value).Convert(plan.nextValueType).Interface(), buf)
|
|
}
|
|
|
|
func tryBaseTypeEncodePlan(value interface{}) (plan *baseTypeEncodePlan, nextValue interface{}, ok bool) {
|
|
refValue := reflect.ValueOf(value)
|
|
|
|
nextValueType := kindToBaseTypes[refValue.Kind()]
|
|
if nextValueType != nil && refValue.Type() != nextValueType {
|
|
return &baseTypeEncodePlan{nextValueType: nextValueType}, refValue.Convert(nextValueType).Interface(), true
|
|
}
|
|
|
|
return nil, nil, false
|
|
}
|
|
|
|
// Encode appends the encoded bytes of value to buf. If value is the SQL value NULL then append nothing and return
|
|
// (nil, nil). The caller of Encode is responsible for writing the correct NULL value or the length of the data
|
|
// written.
|
|
func (ci *ConnInfo) Encode(oid uint32, formatCode int16, value interface{}, buf []byte) (newBuf []byte, err error) {
|
|
if value == nil {
|
|
return nil, nil
|
|
}
|
|
|
|
plan := ci.PlanEncode(oid, formatCode, value)
|
|
if plan == nil {
|
|
return nil, fmt.Errorf("unable to encode %v", value)
|
|
}
|
|
return plan.Encode(value, buf)
|
|
}
|