Created
September 11, 2020 12:23
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Spannerのテーブルから全レコード削除する君
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func deleteAllRows(ctx context.Context, db *spanner.Client, tableName string, primaryKeyName string) { | |
var primaryKeys []string | |
stmt := spanner.Statement{SQL: `SELECT ` + primaryKeyName + ` FROM ` + tableName} | |
iter := db.Single().Query(ctx, stmt) | |
defer iter.Stop() | |
for { | |
row, err := iter.Next() | |
if err == iterator.Done { | |
break | |
} | |
if err != nil { | |
panic(err) | |
} | |
var primaryKey string | |
if err := row.Columns(&primaryKey); err != nil { | |
panic(err) | |
} | |
primaryKeys = append(primaryKeys, primaryKey) | |
} | |
var deleteKeys []string | |
for i, key := range primaryKeys { | |
deleteKeys = append(deleteKeys, key) | |
if i%1000 == 0 { | |
if _, err := db.ReadWriteTransaction( | |
ctx, | |
func(ctx context.Context, txn *spanner.ReadWriteTransaction) error { | |
stmt := spanner.Statement{SQL: `DELETE FROM ` + tableName + ` WHERE ` + primaryKeyName + ` IN UNNEST (@param)`, | |
Params: map[string]interface{}{"param": deleteKeys}, | |
} | |
_, err := txn.Update(ctx, stmt) | |
return err | |
}, | |
); err != nil { | |
panic(err) | |
} | |
deleteKeys = []string{} | |
} | |
} | |
if len(deleteKeys) != 0 { | |
if _, err := db.ReadWriteTransaction( | |
ctx, | |
func(ctx context.Context, txn *spanner.ReadWriteTransaction) error { | |
stmt := spanner.Statement{SQL: `DELETE ` + tableName + ` WHERE ` + primaryKeyName + ` IN UNNEST (@param)`, | |
Params: map[string]interface{}{"param": deleteKeys}, | |
} | |
_, err := txn.Update(ctx, stmt) | |
return err | |
}, | |
); err != nil { | |
panic(err) | |
} | |
} | |
} |
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