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predexp.go
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predexp.go
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// Copyright 2014-2021 Aerospike, Inc.
//
// 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 main
import (
"log"
as "github.com/aerospike/aerospike-client-go"
shared "github.com/aerospike/aerospike-client-go/examples/shared"
)
func main() {
runExample(shared.Client)
log.Println("Example finished successfully.")
}
func runExample(client *as.Client) {
for i := 0; i < 5; i++ {
key, err := as.NewKey(*shared.Namespace, *shared.Set, i) // user key can be of any supported type
shared.PanicOnError(err)
// define some bins
bins := as.BinMap{
"valueBin": 42, // you can pass any supported type as bin value
"versionBin": i,
"id": i,
}
// write the bins
writePolicy := as.NewWritePolicy(0, 0)
err = client.Put(writePolicy, key, bins)
shared.PanicOnError(err)
}
readRecord(client, 2)
// want to update to this
value := int64(123)
version := int64(3)
bins := as.BinMap{
"valueBin": value,
"versionBin": version,
}
// set a predicate expression to only apply if version < 3
// leave the RecordExistsAction at the default value UPDATE - if record isn't found, a new one is created
writePolicy := as.NewWritePolicy(0, 0)
writePolicy.PredExp = []as.PredExp{
as.NewPredExpIntegerBin("versionBin"),
as.NewPredExpIntegerValue(version),
as.NewPredExpIntegerLess(),
}
// this should update the record
key, err := as.NewKey(*shared.Namespace, *shared.Set, 2)
err = client.Put(writePolicy, key, bins)
log.Printf("Put key 2: %s\n", err)
// version is not less than desired value; no effect
key, err = as.NewKey(*shared.Namespace, *shared.Set, 3)
err = client.Put(writePolicy, key, bins)
log.Printf("Put key 3: %s\n", err)
// version is not less than desired value; no effect
key, err = as.NewKey(*shared.Namespace, *shared.Set, 4)
err = client.Put(writePolicy, key, bins)
log.Printf("Put key 4: %s\n", err)
// key does not exist; new record added
key, err = as.NewKey(*shared.Namespace, *shared.Set, 5)
err = client.Put(writePolicy, key, bins)
log.Printf("Put key 5: %s\n", err)
readRecord(client, 2)
readRecord(client, 3)
readRecord(client, 4)
readRecord(client, 5)
// clean up
for i := 0; i < 6; i++ {
deleteRecord(client, i)
}
}
func readRecord(client *as.Client, id int) {
// read one record
readPolicy := as.NewPolicy()
key, err := as.NewKey(*shared.Namespace, *shared.Set, id)
rec, err := client.Get(readPolicy, key)
shared.PanicOnError(err)
log.Printf("%#v\n", *rec)
}
func deleteRecord(client *as.Client, id int) {
// read one record
writePolicy := as.NewWritePolicy(0, 0)
key, err := as.NewKey(*shared.Namespace, *shared.Set, id)
existed, err := client.Delete(writePolicy, key)
shared.PanicOnError(err)
log.Printf("did key exist before delete: %#v\n", existed)
}