31 lines
858 B
Go
31 lines
858 B
Go
// Copyright (C) 2017 ScyllaDB
|
|
// Use of this source code is governed by a ALv2-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package gocqlx
|
|
|
|
import (
|
|
"reflect"
|
|
|
|
gocql "github.com/apache/cassandra-gocql-driver/v2"
|
|
)
|
|
|
|
// Transformer transforms the value of the named parameter to another value.
|
|
type Transformer func(name string, val interface{}) interface{}
|
|
|
|
// DefaultBindTransformer just do nothing.
|
|
//
|
|
// A custom transformer can always be set per Query.
|
|
var DefaultBindTransformer Transformer
|
|
|
|
// UnsetEmptyTransformer unsets all empty parameters.
|
|
// It helps to avoid tombstones when using the same insert/update
|
|
// statement for filled and partially filled named parameters.
|
|
var UnsetEmptyTransformer = func(name string, val interface{}) interface{} {
|
|
v := reflect.ValueOf(val)
|
|
if v.IsZero() {
|
|
return gocql.UnsetValue
|
|
}
|
|
return val
|
|
}
|