Package com.google.cloud.spanner.jdbc

Class JdbcDriver

java.lang.Object
com.google.cloud.spanner.jdbc.JdbcDriver
All Implemented Interfaces:
Driver
public class JdbcDriver extends Object implements Driver
JDBC Driver for Google Cloud Spanner.

Usage: 

 
 
 String url = "jdbc:cloudspanner:/projects/my_project_id/"
            + "instances/my_instance_id/databases/my_database_name?"
            + "credentials=/home/cloudspanner-keys/my-key.json;autocommit=false";
 try (Connection connection = DriverManager.getConnection(url)) {
   try(ResultSet rs = connection.createStatement().executeQuery("SELECT SingerId, AlbumId, MarketingBudget FROM Albums")) {
     while(rs.next()) {
       // do something
     }
   }
 }
The connection that is returned will implement the interface CloudSpannerJdbcConnection. The JDBC connection URL must be specified in the following format: 
 jdbc:cloudspanner:[//host[:port]]/projects/project-id[/instances/instance-id[/databases/database-name]][\?property-name=property-value[;property-name=property-value]*]?
The property-value strings should be url-encoded.

The project-id part of the URI may be filled with the placeholder DEFAULT_PROJECT_ID. This placeholder is replaced by the default project id of the environment that is requesting a connection.

The supported properties are:

  • credentials (String): URL for the credentials file to use for the connection. If you do not specify any credentials at all, the default credentials of the environment as returned by GoogleCredentials.getApplicationDefault() is used.
  • autocommit (boolean): Sets the initial autocommit mode for the connection. Default is true.
  • readonly (boolean): Sets the initial readonly mode for the connection. Default is false.
  • autoConfigEmulator (boolean): Automatically configure the connection to try to connect to the Cloud Spanner emulator. You do not need to specify any host or port in the connection string as long as the emulator is running on the default host/port (localhost:9010). The instance and database in the connection string will automatically be created if these do not yet exist on the emulator. This means that you do not need to execute any `gcloud` commands on the emulator to create the instance and database before you can connect to it. Setting this property to true also enables running concurrent transactions on the emulator. The emulator aborts any concurrent transaction on the emulator, and the JDBC driver works around this by automatically setting a savepoint after each statement that is executed. When the transaction has been aborted by the emulator and the JDBC connection wants to continue with that transaction, the transaction is replayed up until the savepoint that had automatically been set after the last statement that was executed before the transaction was aborted by the emulator.
  • endpoint (string): Set this property to specify a custom endpoint that the JDBC driver should connect to. You can use this property in combination with the autoConfigEmulator property to instruct the JDBC driver to connect to an emulator instance that uses a randomly assigned port numer. See ConcurrentTransactionOnEmulatorTest for a concrete example of how to use this property.
  • usePlainText (boolean): Sets whether the JDBC connection should establish an unencrypted connection to the server. This option can only be used when connecting to a local emulator that does not require an encrypted connection, and that does not require authentication.
  • optimizerVersion (string): The query optimizer version to use for the connection. The value must be either a valid version number or LATEST. If no value is specified, the query optimizer version specified in the environment variable SPANNER_OPTIMIZER_VERSION is used. If no query optimizer version is specified in the connection URL or in the environment variable, the default query optimizer version of Cloud Spanner is used.
  • oauthtoken (String): A valid OAuth2 token to use for the JDBC connection. The token must have been obtained with one or both of the scopes 'https://www.googleapis.com/auth/spanner.admin' and/or 'https://www.googleapis.com/auth/spanner.data'. If you specify both a credentials file and an OAuth token, the JDBC driver will throw an exception when you try to obtain a connection.
  • retryAbortsInternally (boolean): Sets the initial retryAbortsInternally mode for the connection. Default is true. @see CloudSpannerJdbcConnection.setRetryAbortsInternally(boolean) for more information.
  • minSessions (int): Sets the minimum number of sessions in the backing session pool. Defaults to 100.
  • maxSessions (int): Sets the maximum number of sessions in the backing session pool. Defaults to 400.
  • numChannels (int): Sets the number of gRPC channels to use. Defaults to 4.
  • rpcPriority (String): Sets the priority for all RPC invocations from this connection. Defaults to HIGH.