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example_udt_map_test.go
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/
example_udt_map_test.go
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package gocql_test
import (
"context"
"fmt"
"github.com/yugabyte/gocql"
"log"
)
// Example_userDefinedTypesMap demonstrates how to work with user-defined types as maps.
// See also Example_userDefinedTypesStruct and examples for UDTMarshaler and UDTUnmarshaler if you want to map to structs.
func Example_userDefinedTypesMap() {
/* The example assumes the following CQL was used to setup the keyspace:
create keyspace example with replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
create type example.my_udt (field_a text, field_b int);
create table example.my_udt_table(pk int, value frozen<my_udt>, PRIMARY KEY(pk));
*/
cluster := gocql.NewCluster("localhost:9042")
cluster.Keyspace = "example"
cluster.ProtoVersion = 4
session, err := cluster.CreateSession()
if err != nil {
log.Fatal(err)
}
defer session.Close()
ctx := context.Background()
value := map[string]interface{}{
"field_a": "a value",
"field_b": 42,
}
err = session.Query("INSERT INTO example.my_udt_table (pk, value) VALUES (?, ?)",
1, value).WithContext(ctx).Exec()
if err != nil {
log.Fatal(err)
}
var readValue map[string]interface{}
err = session.Query("SELECT value FROM example.my_udt_table WHERE pk = 1").WithContext(ctx).Scan(&readValue)
if err != nil {
log.Fatal(err)
}
fmt.Println(readValue["field_a"])
fmt.Println(readValue["field_b"])
// a value
// 42
}