Package io.deephaven.jdbc.util

Class SnapshotQuery

java.lang.Object

com.illumon.iris.db.tables.remotequery.ContextAwareRemoteQuery<List<Result>>

io.deephaven.jdbc.util.SnapshotQuery

All Implemented Interfaces:

RemoteQuery<List<Result>>, Serializable

public class SnapshotQuery
extends ContextAwareRemoteQuery<List<Result>>

This class is a simple query that just evaluates a Groovy/Python expression, then returns a list of Result objects. The given expression must evaluate to a Table, Integer, or list/array of Table/Integer objects. Each Result will then be either a QueryResult containing a snapshotted remote table handle, or an integer representing an update count. This is intended to correspond to the result types in an SQL data source (a ResultSet or update count).

Snapshotting the tables preserves consistency as the client requests rows from each table in subsequent requests (see TableRowRangeSnapshotFunction).Note this does not guarantee consistency between the tables since we do not wrap this whole thing in an LTM lock.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
SnapshotQuery(String query, int sessionId, Object[] parameters, int maxRows, boolean escapeProcessingEnabled, String bindParameterMode)

Method Summary

Modifier and Type	Method	Description
List<Result>	execute(Database db)	Execute a query on a remote host.

Methods inherited from class com.illumon.iris.db.tables.remotequery.ContextAwareRemoteQuery

getClient, getLog, getRemoteQueryProcessor, getUserContext, initializeContext, initializeContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SnapshotQuery

public SnapshotQuery(String query, int sessionId, Object[] parameters, int maxRows, boolean escapeProcessingEnabled, String bindParameterMode)

Method Details

execute

public List<Result> execute(Database db)

Description copied from interface: RemoteQuery

Execute a query on a remote host.

Parameters:

db - database to use for execution.

Returns:

result of the query.