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decimal.go
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decimal.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package data
import (
"fmt"
"github.com/jiuzhiqian/aliyun-odps-go-sdk/odps/datatype"
"github.com/pkg/errors"
"strconv"
"strings"
)
var InvalidDecimalErr = errors.New("invalid decimal")
type Decimal struct {
precision int
scale int
value string
}
func (d *Decimal) Precision() int {
return d.precision
}
func (d *Decimal) Scale() int {
return d.scale
}
func (d *Decimal) Value() string {
return d.value
}
func NewDecimal(precision, scale int, value string) *Decimal {
return &Decimal{
precision: precision,
scale: scale,
value: value,
}
}
func DecimalFromStr(value string) (*Decimal, error) {
parts := strings.Split(value, ".")
if len(parts) > 3 {
return nil, InvalidDecimalErr
}
_, err := strconv.ParseInt(parts[0], 10, 32)
if err != nil {
return nil, InvalidDecimalErr
}
d := Decimal{}
d.precision = len(parts[0])
if d.precision > 38 {
return nil, errors.New("integer is too big, the most numbers of the integer is 38")
}
if len(parts) == 2 {
_, err = strconv.ParseInt(parts[1], 10, 32)
if err != nil {
return nil, InvalidDecimalErr
}
d.scale = len(parts[1])
}
if d.scale > 18 {
return nil, errors.New("fractional is too long, which is longer than 18")
}
d.value = value
return &d, nil
}
func (d *Decimal) Type() datatype.DataType {
return datatype.NewDecimalType(int32(d.precision), int32(d.scale))
}
func (d *Decimal) String() string {
return fmt.Sprintf("%s", d.value)
}
func (d *Decimal) Sql() string {
return fmt.Sprintf("%sBD", d.value)
}
func (d *Decimal) Scan(value interface{}) error {
return errors.WithStack(tryConvertType(value, d))
}