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ims/util/db/dts/slice.go

72 lines
1.5 KiB

package dts
import (
"context"
"database/sql/driver"
"encoding/json"
"errors"
"fmt"
"strings"
"gorm.io/driver/mysql"
"gorm.io/gorm"
"gorm.io/gorm/clause"
"gorm.io/gorm/schema"
)
// Slice give a generic data type for json encoded slice data.
type Slice[T any] []T
func NewSlice[T any](s []T) Slice[T] {
return s
}
// Value return json value, implement driver.Valuer interface
func (j Slice[T]) Value() (driver.Value, error) {
return json.Marshal(j)
}
// Scan scan value into Slice[T], implements sql.Scanner interface
func (j *Slice[T]) Scan(value interface{}) error {
var bytes []byte
switch v := value.(type) {
case []byte:
bytes = v
case string:
bytes = []byte(v)
default:
return errors.New(fmt.Sprint("Failed to unmarshal JSONB value:", value))
}
return json.Unmarshal(bytes, &j)
}
// GormDataType gorm common data type
func (Slice[T]) GormDataType() string {
return "slices"
}
// GormDBDataType gorm db data type
func (Slice[T]) GormDBDataType(db *gorm.DB, field *schema.Field) string {
switch db.Dialector.Name() {
case "sqlite":
return "JSON"
case "mysql":
return "JSON"
case "postgres":
return "JSONB"
}
return ""
}
func (j Slice[T]) GormValue(ctx context.Context, db *gorm.DB) clause.Expr {
data, _ := json.Marshal(j)
switch db.Dialector.Name() {
case "mysql":
if v, ok := db.Dialector.(*mysql.Dialector); ok && !strings.Contains(v.ServerVersion, "MariaDB") {
return gorm.Expr("CAST(? AS JSON)", string(data))
}
}
return gorm.Expr("?", string(data))
}