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query.go
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/
query.go
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package database
import (
"fmt"
"github.com/calmato/gran-book/api/pkg/array"
"gorm.io/gorm"
)
// ListQuery - 一覧取得時のクエリ用構造体
type ListQuery struct {
Limit int
Offset int
Order *OrderQuery
Conditions []*ConditionQuery
}
// OrderQuery - ソートクエリ用の構造体
type OrderQuery struct {
Field string
OrderBy int
}
// ConditionQuery - 絞り込み用の構造体
type ConditionQuery struct {
Field string
Operator string // ==, !=, >、>=, <=, <, IN, LIKE, BETWEEN
Value interface{}
}
// ソート順
const (
OrderByAsc int = iota // 昇順
OrderByDesc // 降順
)
// 一覧取得クエリの作成用
func (c *Client) GetListQuery(table string, db *gorm.DB, q *ListQuery) *gorm.DB {
db = db.Table(table)
if q == nil {
return db
}
for _, con := range q.Conditions {
db = setWhere(db, con)
}
db = setOrder(db, q.Order)
db = setLimit(db, q.Limit)
db = setOffset(db, q.Offset)
return db
}
// 検索クエリの作成用
func (c *Client) GetListCount(table string, db *gorm.DB, q *ListQuery) (int, error) {
var count int64
if q != nil {
for _, v := range q.Conditions {
db = setWhere(db, v)
}
}
err := db.Table(table).Count(&count).Error
if err != nil {
return 0, err
}
return int(count), nil
}
func setOrder(db *gorm.DB, q *OrderQuery) *gorm.DB {
if q == nil || q.Field == "" {
return db
}
switch q.OrderBy {
case OrderByAsc:
str := fmt.Sprintf("%s asc", q.Field)
return db.Order(str)
case OrderByDesc:
str := fmt.Sprintf("%s desc", q.Field)
return db.Order(str)
default:
return db
}
}
func setWhere(db *gorm.DB, c *ConditionQuery) *gorm.DB {
if c == nil {
return db
}
switch c.Operator {
case "==":
q := fmt.Sprintf("%s = ?", c.Field)
return db.Where(q, c.Value)
case "!=":
q := fmt.Sprintf("%s <> ?", c.Field)
return db.Where(q, c.Value)
case ">", "<", ">=", "<=":
q := fmt.Sprintf("%s %s ?", c.Field, c.Operator)
return db.Where(q, c.Value)
case "IN":
q := fmt.Sprintf("%s IN (?)", c.Field)
vals, _ := array.ConvertStrings(c.Value)
return db.Where(q, vals)
case "LIKE":
q := fmt.Sprintf("%s LIKE ?", c.Field)
n := fmt.Sprintf("%%%s%%", c.Value) // e.g.) あいうえお -> %あいうえお%
return db.Where(q, n)
case "BETWEEN":
q := fmt.Sprintf("%s BETWEEN ? AND ?", c.Field)
vals, err := array.ConvertStrings(c.Value)
if err != nil {
return db
}
return db.Where(q, vals[0], vals[1])
default:
return db
}
}
func setLimit(db *gorm.DB, limit int) *gorm.DB {
if limit > 0 {
return db.Limit(limit)
}
return db
}
func setOffset(db *gorm.DB, offset int) *gorm.DB {
return db.Offset(offset)
}