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docs(bigquery): improve Inserter and StructSaver godoc (#10170)
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alvarowolfx authored May 16, 2024
1 parent c6711b8 commit c1cffb6
Showing 1 changed file with 36 additions and 3 deletions.
39 changes: 36 additions & 3 deletions bigquery/doc.go
Original file line number Diff line number Diff line change
Expand Up @@ -260,6 +260,21 @@ it as well, and call its Run method.
To upload, first define a type that implements the ValueSaver interface, which has a single method named Save.
Then create an Inserter, and call its Put method with a slice of values.
type Item struct {
Name string
Size float64
Count int
}
// Save implements the ValueSaver interface.
func (i *Item) Save() (map[string]bigquery.Value, string, error) {
return map[string]bigquery.Value{
"Name": i.Name,
"Size": i.Size,
"Count": i.Count,
}, "", nil
}
u := table.Inserter()
// Item implements the ValueSaver interface.
items := []*Item{
Expand All @@ -272,15 +287,33 @@ Then create an Inserter, and call its Put method with a slice of values.
}
You can also upload a struct that doesn't implement ValueSaver. Use the StructSaver type
to specify the schema and insert ID by hand, or just supply the struct or struct pointer
directly and the schema will be inferred:
to specify the schema and insert ID by hand:
type item struct {
Name string
Num int
}
// Assume schema holds the table's schema.
savers := []*bigquery.StructSaver{
{Struct: score{Name: "n1", Num: 12}, Schema: schema, InsertID: "id1"},
{Struct: score{Name: "n2", Num: 31}, Schema: schema, InsertID: "id2"},
{Struct: score{Name: "n3", Num: 7}, Schema: schema, InsertID: "id3"},
}
if err := u.Put(ctx, savers); err != nil {
// TODO: Handle error.
}
Lastly, but not least, you can just supply the struct or struct pointer directly and the schema will be inferred:
type Item2 struct {
Name string
Size float64
Count int
}
// Item implements the ValueSaver interface.
// Item2 doesn't implement ValueSaver interface, so schema will be inferred.
items2 := []*Item2{
{Name: "n1", Size: 32.6, Count: 7},
{Name: "n2", Size: 4, Count: 2},
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