How to find Google Spanner table creation date and time? - google-cloud-spanner

Question

I am trying to the table creation date and time in Google Spanner but I dont see any option exist. Even there is no information available in the information.schema

Answer 1

In Spanner, you cannot get a create_time for table and I believe that's due to to how Spanner table is designed and shared to multiple regions thus you cannot get a reliable create_time. A workaround would be; when you create a table you can record that time and save it to another table. This way you will have a register for all your table creation time. A code for this would be:
// Imports the Google Cloud client library
const {Spanner} = require('#google-cloud/spanner');
// Creates a client
const projectId = "PROJECTID"
const instanceId = "INSTANCEID";
const databaseId = "DATABASEID";
const spanner = new Spanner({projectId});
// Gets a reference to a Cloud Spanner instance and database
const instance = spanner.instance(instanceId);
const database = instance.database(databaseId);
// create the table TablesMeta that will holds your tables creation time
const tableMetaschema = [
'CREATE TABLE TablesMeta (' +
' tableId INT64 NOT NULL,' +
' TableName STRING(1024),'+
' TableCreateTime DATE' +
') PRIMARY KEY(tableId)'
];
database.updateSchema(TablesMeta)
// create a new table and add its creation time to the TablesMeta table
const singerSchema = [
'CREATE TABLE Singers (' +
' SingerId INT64 NOT NULL,' +
' FirstName STRING(1024),' +
' LastName STRING(1024),' +
' SingerInfo BYTES(MAX),' +
') PRIMARY KEY(SingerId)'
];
database.updateSchema(singerSchema).then(() => {
database.runTransaction(async (err, transaction) => {
if (err) {
console.error(err);
return;
}
try {
const [rowCount] = await transaction.runUpdate({
sql:
'INSERT TablesMeta (tableId, TableName, TableCreateTime) VALUES (1, #TableName, #TableCreateTime)',
params: {
TableName: 'Singers',
TableCreateTime: Spanner.date(),
},
});
console.log(
`Successfully inserted ${rowCount} record into the TablesMeta table.`
);
await transaction.commit();
} catch (err) {
console.error('ERROR:', err);
} finally {
// Close the database when finished.
database.close();
}
});
})