mirror of
https://gitee.com/rainbond/Rainbond.git
synced 2024-12-05 05:07:38 +08:00
94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
package pq
|
|
|
|
import (
|
|
"math"
|
|
"reflect"
|
|
"time"
|
|
|
|
"github.com/lib/pq/oid"
|
|
)
|
|
|
|
const headerSize = 4
|
|
|
|
type fieldDesc struct {
|
|
// The object ID of the data type.
|
|
OID oid.Oid
|
|
// The data type size (see pg_type.typlen).
|
|
// Note that negative values denote variable-width types.
|
|
Len int
|
|
// The type modifier (see pg_attribute.atttypmod).
|
|
// The meaning of the modifier is type-specific.
|
|
Mod int
|
|
}
|
|
|
|
func (fd fieldDesc) Type() reflect.Type {
|
|
switch fd.OID {
|
|
case oid.T_int8:
|
|
return reflect.TypeOf(int64(0))
|
|
case oid.T_int4:
|
|
return reflect.TypeOf(int32(0))
|
|
case oid.T_int2:
|
|
return reflect.TypeOf(int16(0))
|
|
case oid.T_varchar, oid.T_text:
|
|
return reflect.TypeOf("")
|
|
case oid.T_bool:
|
|
return reflect.TypeOf(false)
|
|
case oid.T_date, oid.T_time, oid.T_timetz, oid.T_timestamp, oid.T_timestamptz:
|
|
return reflect.TypeOf(time.Time{})
|
|
case oid.T_bytea:
|
|
return reflect.TypeOf([]byte(nil))
|
|
default:
|
|
return reflect.TypeOf(new(interface{})).Elem()
|
|
}
|
|
}
|
|
|
|
func (fd fieldDesc) Name() string {
|
|
return oid.TypeName[fd.OID]
|
|
}
|
|
|
|
func (fd fieldDesc) Length() (length int64, ok bool) {
|
|
switch fd.OID {
|
|
case oid.T_text, oid.T_bytea:
|
|
return math.MaxInt64, true
|
|
case oid.T_varchar, oid.T_bpchar:
|
|
return int64(fd.Mod - headerSize), true
|
|
default:
|
|
return 0, false
|
|
}
|
|
}
|
|
|
|
func (fd fieldDesc) PrecisionScale() (precision, scale int64, ok bool) {
|
|
switch fd.OID {
|
|
case oid.T_numeric, oid.T__numeric:
|
|
mod := fd.Mod - headerSize
|
|
precision = int64((mod >> 16) & 0xffff)
|
|
scale = int64(mod & 0xffff)
|
|
return precision, scale, true
|
|
default:
|
|
return 0, 0, false
|
|
}
|
|
}
|
|
|
|
// ColumnTypeScanType returns the value type that can be used to scan types into.
|
|
func (rs *rows) ColumnTypeScanType(index int) reflect.Type {
|
|
return rs.colTyps[index].Type()
|
|
}
|
|
|
|
// ColumnTypeDatabaseTypeName return the database system type name.
|
|
func (rs *rows) ColumnTypeDatabaseTypeName(index int) string {
|
|
return rs.colTyps[index].Name()
|
|
}
|
|
|
|
// ColumnTypeLength returns the length of the column type if the column is a
|
|
// variable length type. If the column is not a variable length type ok
|
|
// should return false.
|
|
func (rs *rows) ColumnTypeLength(index int) (length int64, ok bool) {
|
|
return rs.colTyps[index].Length()
|
|
}
|
|
|
|
// ColumnTypePrecisionScale should return the precision and scale for decimal
|
|
// types. If not applicable, ok should be false.
|
|
func (rs *rows) ColumnTypePrecisionScale(index int) (precision, scale int64, ok bool) {
|
|
return rs.colTyps[index].PrecisionScale()
|
|
}
|