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Enhance support for custom types

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* Add per connection oid to name map
* Global default type format is now based on names not oids
* Add better docs for custom types
This commit is contained in:
Jack Christensen
2014-09-13 11:33:34 -05:00
parent 68034af721
commit 8f81acfb5f
6 changed files with 104 additions and 36 deletions
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values.go
+29 -22
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@@ -39,27 +39,32 @@ const (
BinaryFormatCode = 1
)
var DefaultOidFormats map[Oid]int16
// DefaultTypeFormats maps type names to their default requested format (text
// or binary). In theory the Scanner interface should be the one to determine
// the format of the returned values. However, the query has already been
// executed by the time Scan is called so it has no chance to set the format.
// So for types that should be returned in binary th
var DefaultTypeFormats map[string]int16
func init() {
DefaultOidFormats = make(map[Oid]int16)
DefaultOidFormats[BoolOid] = BinaryFormatCode
DefaultOidFormats[ByteaOid] = BinaryFormatCode
DefaultOidFormats[Int2Oid] = BinaryFormatCode
DefaultOidFormats[Int4Oid] = BinaryFormatCode
DefaultOidFormats[Int8Oid] = BinaryFormatCode
DefaultOidFormats[Float4Oid] = BinaryFormatCode
DefaultOidFormats[Float8Oid] = BinaryFormatCode
DefaultOidFormats[DateOid] = BinaryFormatCode
DefaultOidFormats[TimestampTzOid] = BinaryFormatCode
DefaultOidFormats[Int2ArrayOid] = BinaryFormatCode
DefaultOidFormats[Int4ArrayOid] = BinaryFormatCode
DefaultOidFormats[Int8ArrayOid] = BinaryFormatCode
DefaultOidFormats[Float4ArrayOid] = BinaryFormatCode
DefaultOidFormats[Float8ArrayOid] = BinaryFormatCode
DefaultOidFormats[TextArrayOid] = BinaryFormatCode
DefaultOidFormats[VarcharArrayOid] = BinaryFormatCode
DefaultOidFormats[OidOid] = BinaryFormatCode
DefaultTypeFormats = make(map[string]int16)
DefaultTypeFormats["_float4"] = BinaryFormatCode
DefaultTypeFormats["_float8"] = BinaryFormatCode
DefaultTypeFormats["_int2"] = BinaryFormatCode
DefaultTypeFormats["_int4"] = BinaryFormatCode
DefaultTypeFormats["_int8"] = BinaryFormatCode
DefaultTypeFormats["_text"] = BinaryFormatCode
DefaultTypeFormats["_varchar"] = BinaryFormatCode
DefaultTypeFormats["bool"] = BinaryFormatCode
DefaultTypeFormats["bytea"] = BinaryFormatCode
DefaultTypeFormats["date"] = BinaryFormatCode
DefaultTypeFormats["float4"] = BinaryFormatCode
DefaultTypeFormats["float8"] = BinaryFormatCode
DefaultTypeFormats["int2"] = BinaryFormatCode
DefaultTypeFormats["int4"] = BinaryFormatCode
DefaultTypeFormats["int8"] = BinaryFormatCode
DefaultTypeFormats["oid"] = BinaryFormatCode
DefaultTypeFormats["timestamptz"] = BinaryFormatCode
}
type SerializationError string
@@ -70,9 +75,11 @@ func (e SerializationError) Error() string {
// Scanner is an interface used to decode values from the PostgreSQL server.
type Scanner interface {
// Scan MUST check r.Type().DataType and r.Type().FormatCode before decoding.
// It should not assume that it was called on a data type or format that it
// understands.
// Scan MUST check r.Type().DataType (to check by OID) or
// r.Type().DataTypeName (to check by name) to ensure that it is scanning an
// expected column type. It also MUST check r.Type().FormatCode before
// decoding. It should not assume that it was called on a data type or format
// that it understands.
Scan(r *ValueReader) error
}