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field.go
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field.go
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// Copyright 2020 the go-etl Authors.
//
// Licensed 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 oracle
import (
"database/sql/driver"
"fmt"
"math/big"
"strconv"
"time"
"github.com/as-tool/as-etl-engine/common/element"
"github.com/as-tool/as-etl-storage/database"
"github.com/godror/godror"
"github.com/shopspring/decimal"
)
var (
dateLayout = element.DefaultTimeFormat[:10]
datetimeLayout = element.DefaultTimeFormat[:26]
)
// Field Field
type Field struct {
*database.BaseField
database.BaseConfigSetter
}
// NewField Generate a field based on basic column attributes
func NewField(bf *database.BaseField) *Field {
return &Field{
BaseField: bf,
}
}
// Quoted Quotation, used in SQL statements
func (f *Field) Quoted() string {
return Quoted(f.Name())
}
// BindVar SQL placeholder, used in SQL statements
func (f *Field) BindVar(i int) string {
// Fix the time format error ORA-01861: literal does not match format string
switch f.FieldType().DatabaseTypeName() {
case "DATE":
return "to_date(:" + strconv.Itoa(i) + ",'yyyy-mm-dd hh24:mi:ss')"
case "TIMESTAMP", "TIMESTAMP WITH TIME ZONE", "TIMESTAMP WITH LOCAL TIME ZONE":
return "to_timestamp(:" + strconv.Itoa(i) + ",'yyyy-mm-dd hh24:mi:ss.ff9')"
}
return ":" + strconv.Itoa(i)
}
// Select Field for querying, used in SQL query statements
func (f *Field) Select() string {
return Quoted(f.Name())
}
// Type Field type
func (f *Field) Type() database.FieldType {
return NewFieldType(f.FieldType())
}
// Scanner Scanner, used for reading data
func (f *Field) Scanner() database.Scanner {
return NewScanner(f)
}
// Valuer Valuer, using GoValuer to process data
func (f *Field) Valuer(c element.Column) database.Valuer {
return NewValuer(f, c)
}
// FieldType Field type
type FieldType struct {
*database.BaseFieldType
supportted bool
}
// NewFieldType Create a new field type
func NewFieldType(typ database.ColumnType) *FieldType {
f := &FieldType{
BaseFieldType: database.NewBaseFieldType(typ),
}
switch f.DatabaseTypeName() {
case "BOOLEAN",
"BINARY_INTEGER",
"NUMBER", "FLOAT", "DOUBLE",
"TIMESTAMP", "TIMESTAMP WITH TIME ZONE", "TIMESTAMP WITH LOCAL TIME ZONE", "DATE",
"VARCHAR2", "NVARCHAR2", "CHAR", "NCHAR", "LONG",
"CLOB", "NCLOB", "BLOB", "RAW", "LONG RAW":
f.supportted = true
}
return f
}
// IsSupported Whether it supports parsing
func (f *FieldType) IsSupported() bool {
return f.supportted
}
// Scanner Scanner
type Scanner struct {
f *Field
database.BaseScanner
}
// NewScanner Generate a scanner based on the column type
func NewScanner(f *Field) *Scanner {
return &Scanner{
f: f,
}
}
// Scan Read data based on the column type
// BOOLEAN is treated as a bool type
// BINARY_INTEGER is treated as a bigint type
// NUMBER, FLOAT, DOUBLE are treated as decimal types
// TIMESTAMP, TIMESTAMP WITH TIME ZONE, TIMESTAMP WITH LOCAL TIME ZONE, DATE are treated as time types
// CLOB, NCLOB, VARCHAR2, NVARCHAR2, CHAR, NCHAR are treated as string types
// BLOB, RAW, LONG RAW, LONG are treated as byte types
func (s *Scanner) Scan(src interface{}) (err error) {
var cv element.ColumnValue
byteSize := element.ByteSize(src)
switch s.f.Type().DatabaseTypeName() {
case "BOOLEAN":
switch data := src.(type) {
case nil:
cv = element.NewNilBoolColumnValue()
case bool:
cv = element.NewBoolColumnValue(data)
default:
return fmt.Errorf("src is %v(%T), but not %v", src, src, element.TypeBigInt)
}
case "BINARY_INTEGER":
switch data := src.(type) {
case nil:
cv = element.NewNilBigIntColumnValue()
case int64:
cv = element.NewBigIntColumnValueFromInt64(data)
case uint64:
cv = element.NewBigIntColumnValue(new(big.Int).SetUint64(data))
default:
return fmt.Errorf("src is %v(%T), but not %v", src, src, element.TypeBigInt)
}
// todo test BFILE
case // BFILE,
"BLOB", "LONG", "RAW", "LONG RAW":
switch data := src.(type) {
case nil:
cv = element.NewNilBytesColumnValue()
case []byte:
cv = element.NewBytesColumnValue(data)
default:
return fmt.Errorf("src is %v(%T),but not %v", src, src, element.TypeBytes)
}
case "DATE":
switch data := src.(type) {
case nil:
cv = element.NewNilTimeColumnValue()
case time.Time:
cv = element.NewTimeColumnValueWithDecoder(data, element.NewStringTimeDecoder(dateLayout))
default:
return fmt.Errorf("src is %v(%T), but not %v", src, src, element.TypeTime)
}
case "TIMESTAMP", "TIMESTAMP WITH TIME ZONE", "TIMESTAMP WITH LOCAL TIME ZONE":
switch data := src.(type) {
case nil:
cv = element.NewNilTimeColumnValue()
case time.Time:
cv = element.NewTimeColumnValueWithDecoder(data, element.NewStringTimeDecoder(datetimeLayout))
default:
return fmt.Errorf("src is %v(%T), but not %v", src, src, element.TypeTime)
}
case "CLOB", "NCLOB", "VARCHAR2", "NVARCHAR2", "CHAR", "NCHAR":
switch data := src.(type) {
case string:
if data == "" {
cv = element.NewNilStringColumnValue()
} else {
switch s.f.Type().DatabaseTypeName() {
case "CHAR", "NCHAR":
data = s.f.TrimStringChar(data)
}
cv = element.NewStringColumnValue(data)
}
default:
return fmt.Errorf("src is %v(%T), but not %v", src, src, element.TypeString)
}
case "NUMBER", "FLOAT", "DOUBLE":
s := ""
switch data := src.(type) {
case nil:
cv = element.NewNilDecimalColumnValue()
case float32:
cv = element.NewDecimalColumnValue(decimal.NewFromFloat32(data))
case float64:
cv = element.NewDecimalColumnValueFromFloat(data)
case int64:
s = strconv.FormatInt(data, 10)
case uint64:
s = strconv.FormatUint(data, 10)
case bool:
s = "0"
if data {
s = "1"
}
case godror.Number:
s = string(data)
byteSize = len(s)
default:
return fmt.Errorf("src is %v(%T), but not %v", src, src, element.TypeDecimal)
}
if s != "" {
if cv, err = element.NewDecimalColumnValueFromString(s); err != nil {
return
}
}
default:
return fmt.Errorf("src is %v(%T), but db type is %v", src, src, s.f.Type().DatabaseTypeName())
}
s.SetColumn(element.NewDefaultColumn(cv, s.f.Name(), byteSize))
return
}
// Valuer Valuer
type Valuer struct {
f *Field
c element.Column
}
// NewValuer Create a new valuer
func NewValuer(f *Field, c element.Column) *Valuer {
return &Valuer{
f: f,
c: c,
}
}
// Value Assignment
func (v *Valuer) Value() (value driver.Value, err error) {
switch v.f.Type().DatabaseTypeName() {
case "BOOLEAN":
// In Oracle, inserting an empty string is actually treated as nil, corresponding to NULL
if v.c.IsNil() {
return "", nil
}
var b bool
if b, err = v.c.AsBool(); err != nil {
return nil, err
}
if b {
return "1", nil
}
return "0", nil
// todo test BFILE
case // BFILE,
"BLOB", "LONG", "RAW", "LONG RAW":
// For these types, inserting nil corresponds to NULL
if v.c.IsNil() {
return nil, nil
}
return v.c.AsBytes()
}
// In Oracle, inserting an empty string is actually treated as nil, corresponding to NULL
if v.c.IsNil() {
return "", nil
}
// Due to Oracle's special conversion mechanism, all data needs to be converted to string type for insertion
return v.c.AsString()
}