importcom.zaxxer.hikari.HikariConfig;importcom.zaxxer.hikari.HikariDataSource;importjavax.sql.DataSource;publicclassConnectorConnectionPoolFactoryextendsConnectionPoolFactory{// Note: Saving credentials in environment variables is convenient, but not// secure - consider a more secure solution such as// Cloud Secret Manager (https://cloud.google.com/secret-manager) to help// keep secrets safe.privatestaticfinalStringINSTANCE_CONNECTION_NAME=System.getenv("INSTANCE_CONNECTION_NAME");privatestaticfinalStringINSTANCE_UNIX_SOCKET=System.getenv("INSTANCE_UNIX_SOCKET");privatestaticfinalStringDB_USER=System.getenv("DB_USER");privatestaticfinalStringDB_PASS=System.getenv("DB_PASS");privatestaticfinalStringDB_NAME=System.getenv("DB_NAME");publicstaticDataSourcecreateConnectionPool(){// The configuration object specifies behaviors for the connection pool.HikariConfigconfig=newHikariConfig();// The following URL is equivalent to setting the config options below:// jdbc:postgresql:///<DB_NAME>?cloudSqlInstance=<INSTANCE_CONNECTION_NAME>&// socketFactory=com.google.cloud.sql.postgres.SocketFactory&user=<DB_USER>&password=<DB_PASS>// See the link below for more info on building a JDBC URL for the Cloud SQL JDBC Socket Factory// https://github.com/GoogleCloudPlatform/cloud-sql-jdbc-socket-factory#creating-the-jdbc-url// Configure which instance and what database user to connect with.config.setJdbcUrl(String.format("jdbc:postgresql:///%s",DB_NAME));config.setUsername(DB_USER);// e.g. "root", _postgres"config.setPassword(DB_PASS);// e.g. "my-password"config.addDataSourceProperty("socketFactory","com.google.cloud.sql.postgres.SocketFactory");config.addDataSourceProperty("cloudSqlInstance",INSTANCE_CONNECTION_NAME);// The ipTypes argument can be used to specify a comma delimited list of preferred IP types// for connecting to a Cloud SQL instance. The argument ipTypes=PRIVATE will force the// SocketFactory to connect with an instance's associated private IP.config.addDataSourceProperty("ipTypes","PUBLIC,PRIVATE");// cloudSqlRefreshStrategy set to "lazy" is used to perform a// refresh when needed, rather than on a scheduled interval.// This is recommended for serverless environments to// avoid background refreshes from throttling CPU.config.addDataSourceProperty("cloudSqlRefreshStrategy","lazy");// ... Specify additional connection properties here.// ...// Initialize the connection pool using the configuration object.returnnewHikariDataSource(config);}}

importosfromgoogle.cloud.sql.connectorimportConnector,IPTypesimportpg8000importsqlalchemydefconnect_with_connector()->sqlalchemy.engine.base.Engine:"""    Initializes a connection pool for a Cloud SQL instance of Postgres.    Uses the Cloud SQL Python Connector package.    """# Note: Saving credentials in environment variables is convenient, but not# secure - consider a more secure solution such as# Cloud Secret Manager (https://cloud.google.com/secret-manager) to help# keep secrets safe.instance_connection_name=os.environ["INSTANCE_CONNECTION_NAME"]# e.g. 'project:region:instance'db_user=os.environ["DB_USER"]# e.g. 'my-db-user'db_pass=os.environ["DB_PASS"]# e.g. 'my-db-password'db_name=os.environ["DB_NAME"]# e.g. 'my-database'ip_type=IPTypes.PRIVATEifos.environ.get("PRIVATE_IP")elseIPTypes.PUBLIC# initialize Cloud SQL Python Connector objectconnector=Connector(refresh_strategy="LAZY")defgetconn()->pg8000.dbapi.Connection:conn:pg8000.dbapi.Connection=connector.connect(instance_connection_name,"pg8000",user=db_user,password=db_pass,db=db_name,ip_type=ip_type,)returnconn# The Cloud SQL Python Connector can be used with SQLAlchemy# using the 'creator' argument to 'create_engine'pool=sqlalchemy.create_engine("postgresql+pg8000://",creator=getconn,# ...)returnpool

packagecloudsqlimport("context""database/sql""fmt""log""net""os""cloud.google.com/go/cloudsqlconn""github.com/jackc/pgx/v5""github.com/jackc/pgx/v5/stdlib")funcconnectWithConnector()(*sql.DB,error){mustGetenv:=func(kstring)string{v:=os.Getenv(k)ifv==""{log.Fatalf("Fatal Error in connect_connector.go: %s environment variable not set.\n",k)}returnv}// Note: Saving credentials in environment variables is convenient, but not// secure - consider a more secure solution such as// Cloud Secret Manager (https://cloud.google.com/secret-manager) to help// keep passwords and other secrets safe.var(dbUser=mustGetenv("DB_USER")// e.g. 'my-db-user'dbPwd=mustGetenv("DB_PASS")// e.g. 'my-db-password'dbName=mustGetenv("DB_NAME")// e.g. 'my-database'instanceConnectionName=mustGetenv("INSTANCE_CONNECTION_NAME")// e.g. 'project:region:instance'usePrivate=os.Getenv("PRIVATE_IP"))dsn:=fmt.Sprintf("user=%s password=%s database=%s",dbUser,dbPwd,dbName)config,err:=pgx.ParseConfig(dsn)iferr!=nil{returnnil,err}varopts[]cloudsqlconn.OptionifusePrivate!=""{opts=append(opts,cloudsqlconn.WithDefaultDialOptions(cloudsqlconn.WithPrivateIP()))}// WithLazyRefresh() Option is used to perform refresh// when needed, rather than on a scheduled interval.// This is recommended for serverless environments to// avoid background refreshes from throttling CPU.opts=append(opts,cloudsqlconn.WithLazyRefresh())d,err:=cloudsqlconn.NewDialer(context.Background(),opts...)iferr!=nil{returnnil,err}// Use the Cloud SQL connector to handle connecting to the instance.// This approach does *NOT* require the Cloud SQL proxy.config.DialFunc=func(ctxcontext.Context,network,instancestring)(net.Conn,error){returnd.Dial(ctx,instanceConnectionName)}dbURI:=stdlib.RegisterConnConfig(config)dbPool,err:=sql.Open("pgx",dbURI)iferr!=nil{returnnil,fmt.Errorf("sql.Open: %w",err)}returndbPool,nil}

constKnex=require('knex');const{Connector}=require('@google-cloud/cloud-sql-connector');// In case the PRIVATE_IP environment variable is defined then we set// the ipType=PRIVATE for the new connector instance, otherwise defaults// to public ip type.constgetIpType=()=>process.env.PRIVATE_IP==='1'||process.env.PRIVATE_IP==='true'?'PRIVATE':'PUBLIC';// connectWithConnector initializes connection pool for a Cloud SQL instance// of Postgres using the Cloud SQL Node.js Connector.constconnectWithConnector=asyncconfig=>{// Note: Saving credentials in environment variables is convenient, but not// secure - consider a more secure solution such as// Cloud Secret Manager (https://cloud.google.com/secret-manager) to help// keep secrets safe.constconnector=newConnector();constclientOpts=awaitconnector.getOptions({instanceConnectionName:process.env.INSTANCE_CONNECTION_NAME,ipType:getIpType(),});constdbConfig={client:'pg',connection:{...clientOpts,user:process.env.DB_USER,// e.g. 'my-user'password:process.env.DB_PASS,// e.g. 'my-user-password'database:process.env.DB_NAME,// e.g. 'my-database'},// ... Specify additional properties here....config,};// Establish a connection to the database.returnKnex(dbConfig);};