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column.go
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column.go
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// Copyright 2020 Pilosa Corp.
//
// 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 sql
import (
"strings"
"time"
)
const ColID = "_id"
type FuncName string
const (
FuncCount FuncName = "count"
FuncMin FuncName = "min"
FuncMax FuncName = "max"
FuncSum FuncName = "sum"
FuncAvg FuncName = "avg"
)
// Column is an interface which supports mapping to
// source headers, and aliasing column names.
// Alias() should always return a value;
// either a unique alias, or the same value
// return by Name(), but never an empty string.
type Column interface {
Source() string
Name() string
Alias() string
}
type BasicColumn struct {
source string
name string
alias string
}
func NewBasicColumn(s, n, a string) *BasicColumn {
return &BasicColumn{
source: s,
name: n,
alias: a,
}
}
func (b *BasicColumn) Source() string {
return b.source
}
func (b *BasicColumn) Name() string {
return b.name
}
func (b *BasicColumn) Alias() string {
if b.alias != "" {
return b.alias
}
return b.name
}
type StarColumn struct{}
func NewStarColumn() *StarColumn {
return &StarColumn{}
}
func (s *StarColumn) Source() string {
return ""
}
func (s *StarColumn) Name() string {
return ""
}
func (s *StarColumn) Alias() string {
return ""
}
func ConvertToTime(text string) (time.Time, bool) {
timeFormats := []string{
"2006-01-02 15:04:05",
"2006-01-02 15:04",
"2006-01-02",
}
for _, timeFormat := range timeFormats {
if t, err := time.Parse(timeFormat, text); err == nil {
return t, true
}
}
return time.Now(), false
}
func ExtractFieldName(columName string) (fieldName string, isSpecial bool) {
isSpecial = false
fieldName = columName
if strings.HasPrefix(columName, "_") {
isSpecial = true
if strings.HasSuffix(columName, "_time") {
fieldName = columName[1 : len(columName)-5]
}
}
return
}