net.snowflake.client.core

Class SFStatement

java.lang.Object

net.snowflake.client.core.SFBaseStatement

net.snowflake.client.core.SFStatement

public class SFStatement
extends SFBaseStatement

Snowflake statement

Nested Class Summary

Nested classes/interfaces inherited from class net.snowflake.client.core.SFBaseStatement

SFBaseStatement.CallingMethod

Field Summary

Fields inherited from class net.snowflake.client.core.SFBaseStatement

MAX_STATEMENT_PARAMETERS, queryTimeout, statementParametersMap

Constructor Summary

Constructors

Constructor and Description
SFStatement(SFSession session)

Method Summary

Modifier and Type	Method and Description
SFBaseResultSet	asyncExecute(String sql, Map<String,ParameterBindingDTO> parametersBinding, SFBaseStatement.CallingMethod caller) Execute sql asynchronously.
void	cancel() Aborts the statement.
void	close() Closes the statement.
SFStatementMetaData	describe(String sql) Describe a statement
SFBaseResultSet	execute(String sql, boolean asyncExec, Map<String,ParameterBindingDTO> parametersBinding, SFBaseStatement.CallingMethod caller) Execute sql
SFBaseResultSet	execute(String sql, Map<String,ParameterBindingDTO> parametersBinding, SFBaseStatement.CallingMethod caller) Executes the given SQL string.
Object	executeHelper(String sql, String mediaType, Map<String,ParameterBindingDTO> bindValues, boolean describeOnly, boolean internal, boolean asyncExec) A helper method to build URL and submit the SQL to snowflake for exec
String[]	getChildQueryIds(String queryID) Return an array of child query ID for the given query ID.
long	getConservativeMemoryLimit()
int	getConservativePrefetchThreads()
boolean	getMoreResults()
boolean	getMoreResults(int current) Sets the result set to the next one, if available.
SFBaseResultSet	getResultSet() Retrieves the current result as a ResultSet, if any.
SFBaseSession	getSFBaseSession() Returns the SFBaseSession associated with this SFBaseStatement.
boolean	hasChildren() If this is a multi-statement, i.e., has child results.

Methods inherited from class net.snowflake.client.core.SFBaseStatement

addProperty, executeSetProperty, isFileTransfer

Methods inherited from class java.lang.Object

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

Constructor Detail

SFStatement

public SFStatement(SFSession session)

Method Detail

describe

public SFStatementMetaData describe(String sql)
                             throws SFException,
                                    SQLException

Describe a statement

Specified by:

describe in class SFBaseStatement

Parameters:

sql - statement

Returns:

metadata of statement including result set metadata and binding information

Throws:

SQLException - if connection is already closed

SFException - if result set is null

executeHelper

public Object executeHelper(String sql,
                            String mediaType,
                            Map<String,ParameterBindingDTO> bindValues,
                            boolean describeOnly,
                            boolean internal,
                            boolean asyncExec)
                     throws SnowflakeSQLException,
                            SFException

A helper method to build URL and submit the SQL to snowflake for exec

Parameters:

sql - sql statement

mediaType - media type

bindValues - map of binding values

describeOnly - whether only show the result set metadata

internal - run internal query not showing up in history

Returns:

raw json response

Throws:

SFException - if query is canceled

SnowflakeSQLException - if query is already running

getConservativePrefetchThreads

public int getConservativePrefetchThreads()

Specified by:

getConservativePrefetchThreads in class SFBaseStatement

Returns:

conservative prefetch threads before fetching results

getConservativeMemoryLimit

public long getConservativeMemoryLimit()

Specified by:

getConservativeMemoryLimit in class SFBaseStatement

Returns:

conservative memory limit before fetching results

getChildQueryIds

public String[] getChildQueryIds(String queryID)
                          throws SQLException

Return an array of child query ID for the given query ID.

If the given query ID is for a multiple statements query, it returns an array of its child statements, otherwise, it returns an array to include the given query ID.

Specified by:

getChildQueryIds in class SFBaseStatement

Parameters:

queryID - The given query ID

Returns:

An array of child query IDs

Throws:

SQLException - If the query is running or the corresponding query is FAILED.

execute

public SFBaseResultSet execute(String sql,
                               Map<String,ParameterBindingDTO> parametersBinding,
                               SFBaseStatement.CallingMethod caller)
                        throws SQLException,
                               SFException

Description copied from class: SFBaseStatement

Executes the given SQL string.

Specified by:

execute in class SFBaseStatement

Parameters:

sql - The SQL string to execute, synchronously.

parametersBinding - parameters to bind

caller - the JDBC interface method that called this method, if any

Returns:

whether there is result set or not

Throws:

SQLException - if failed to execute sql

SFException - exception raised from Snowflake components

execute

public SFBaseResultSet execute(String sql,
                               boolean asyncExec,
                               Map<String,ParameterBindingDTO> parametersBinding,
                               SFBaseStatement.CallingMethod caller)
                        throws SQLException,
                               SFException

Execute sql

Parameters:

sql - sql statement.

parametersBinding - parameters to bind

caller - the JDBC interface method that called this method, if any

Returns:

whether there is result set or not

Throws:

SQLException - if failed to execute sql

SFException - exception raised from Snowflake components

SQLException - if SQL error occurs

close

public void close()

Description copied from class: SFBaseStatement

Closes the statement. Open result sets are closed, connections are terminated, state is cleared, etc.

Specified by:

close in class SFBaseStatement

cancel

public void cancel()
            throws SFException,
                   SQLException

Description copied from class: SFBaseStatement

Aborts the statement.

Specified by:

cancel in class SFBaseStatement

Throws:

SFException - if the statement is already closed.

SQLException - if there are server-side errors from trying to abort.

getSFBaseSession

public SFBaseSession getSFBaseSession()

Description copied from class: SFBaseStatement

Returns the SFBaseSession associated with this SFBaseStatement.

Specified by:

getSFBaseSession in class SFBaseStatement

getMoreResults

public boolean getMoreResults()
                       throws SQLException

Throws:

SQLException

getMoreResults

public boolean getMoreResults(int current)
                       throws SQLException

Description copied from class: SFBaseStatement

Sets the result set to the next one, if available.

Specified by:

getMoreResults in class SFBaseStatement

Parameters:

current - What to do with the current result. One of Statement.CLOSE_CURRENT_RESULT, Statement.CLOSE_ALL_RESULTS, or Statement.KEEP_CURRENT_RESULT

Returns:

true if there is a next result and it's a result set false if there are no more results, or there is a next result and it's an update count

Throws:

SQLException - if something fails while getting the next result

getResultSet

public SFBaseResultSet getResultSet()

Description copied from class: SFBaseStatement

Retrieves the current result as a ResultSet, if any. This is invoked by SnowflakeStatement and should return an SFBaseResultSet, which is then wrapped in a SnowflakeResultSet.

Specified by:

getResultSet in class SFBaseStatement

hasChildren

public boolean hasChildren()

Description copied from class: SFBaseStatement

If this is a multi-statement, i.e., has child results.

Specified by:

hasChildren in class SFBaseStatement

asyncExecute

public SFBaseResultSet asyncExecute(String sql,
                                    Map<String,ParameterBindingDTO> parametersBinding,
                                    SFBaseStatement.CallingMethod caller)
                             throws SQLException,
                                    SFException

Description copied from class: SFBaseStatement

Execute sql asynchronously. Note that at a minimum, this does not have to be supported; if executeAsyncQuery() is called from SnowflakeStatement and the SFConnectionHandler's supportsAsyncQuery() returns false, an exception is thrown. If this is un-implemented, then supportsAsyncQuery() should return false.

Specified by:

asyncExecute in class SFBaseStatement

Parameters:

sql - sql statement.

parametersBinding - parameters to bind

caller - the JDBC interface method that called this method, if any

Returns:

whether there is result set or not

Throws:

SQLException - if failed to execute sql

SFException - exception raised from Snowflake components