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updater.go
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/
updater.go
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package writer
import (
"context"
"reflect"
"github.com/apache/cassandra-gocql-driver"
c "github.com/core-go/cassandra"
)
type Updater[T any] struct {
db *gocql.ClusterConfig
table string
Map func(T)
VersionIndex int
schema *c.Schema
}
func NewUpdater[T any](db *gocql.ClusterConfig, table string, options ...func(T)) *Updater[T] {
var mp func(T)
if len(options) >= 1 {
mp = options[0]
}
return NewUpdaterWithVersion[T](db, table, mp)
}
func NewUpdaterWithVersion[T any](db *gocql.ClusterConfig, table string, mp func(T), options ...int) *Updater[T] {
version := -1
if len(options) > 0 && options[0] >= 0 {
version = options[0]
}
var t T
modelType := reflect.TypeOf(t)
if modelType.Kind() == reflect.Ptr {
modelType = modelType.Elem()
}
schema := c.CreateSchema(modelType)
return &Updater[T]{db: db, table: table, VersionIndex: version, schema: schema, Map: mp}
}
func (w *Updater[T]) Write(ctx context.Context, model T) error {
if w.Map != nil {
w.Map(model)
}
session, er0 := w.db.CreateSession()
if er0 != nil {
return er0
}
defer session.Close()
return c.UpdateWithVersion(session, w.table, model, w.VersionIndex, w.schema)
}