org.postgresql.core

Class QueryExecutorBase

java.lang.Object

org.postgresql.core.QueryExecutorBase

All Implemented Interfaces:

QueryExecutor, TypeTransferModeRegistry

Direct Known Subclasses:

QueryExecutorImpl

public abstract class QueryExecutorBase
extends Object
implements QueryExecutor

Field Summary

Fields

Modifier and Type	Field and Description
protected PGStream	pgStream

Fields inherited from interface org.postgresql.core.QueryExecutor

QUERY_BOTH_ROWS_AND_STATUS, QUERY_DESCRIBE_ONLY, QUERY_DISALLOW_BATCHING, QUERY_EXECUTE_AS_SIMPLE, QUERY_FORCE_DESCRIBE_PORTAL, QUERY_FORWARD_CURSOR, QUERY_NO_BINARY_TRANSFER, QUERY_NO_METADATA, QUERY_NO_RESULTS, QUERY_ONESHOT, QUERY_SUPPRESS_BEGIN

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	QueryExecutorBase(PGStream pgStream, String user, String database, int cancelSignalTimeout, Properties info)

Method Summary

Modifier and Type	Method and Description
void	abort() Abort at network level without sending the Terminate message to the backend.
void	addNotification(PGNotification notification)
void	addWarning(SQLWarning newWarning)
CachedQuery	borrowCallableQuery(String sql)
CachedQuery	borrowQuery(String sql)
CachedQuery	borrowQueryByKey(Object key)
CachedQuery	borrowReturningQuery(String sql, String[] columnNames)
void	close() Close this connection cleanly.
CachedQuery	createQuery(String sql, boolean escapeProcessing, boolean isParameterized, String... columnNames)
CachedQuery	createQueryByKey(Object key)
Object	createQueryKey(String sql, boolean escapeProcessing, boolean isParameterized, String... columnNames)
AutoSave	getAutoSave()
int	getBackendPID() Return the process ID (PID) of the backend server process handling this connection.
String	getDatabase()
Encoding	getEncoding()
HostSpec	getHostSpec()
PGNotification[]	getNotifications() Retrieve and clear the set of asynchronous notifications pending on this connection.
PreferQueryMode	getPreferQueryMode()
String	getServerVersion() Return the server version from the server_version GUC.
int	getServerVersionNum() Get a machine-readable server version.
boolean	getStandardConformingStrings() Returns whether the server treats string-literals according to the SQL standard or if it uses traditional PostgreSQL escaping rules.
TransactionState	getTransactionState() Get the current transaction state of this connection.
String	getUser()
SQLWarning	getWarnings() Retrieve and clear the chain of warnings accumulated on this connection.
protected boolean	hasNotifications()
boolean	isClosed() Check if this connection is closed.
boolean	isColumnSanitiserDisabled()
boolean	isFlushCacheOnDeallocate()
boolean	isReWriteBatchedInsertsEnabled()
void	releaseQuery(CachedQuery cachedQuery)
protected abstract void	sendCloseMessage()
void	sendQueryCancel() Sends a query cancellation for this connection.
void	setAutoSave(AutoSave autoSave)
void	setBackendKeyData(int cancelPid, int cancelKey)
void	setEncoding(Encoding encoding)
void	setFlushCacheOnDeallocate(boolean flushCacheOnDeallocate) By default, the connection resets statement cache in case deallocate all/discard all message is observed.
void	setServerVersion(String serverVersion)
void	setServerVersionNum(int serverVersionNum)
void	setStandardConformingStrings(boolean value)
void	setTransactionState(TransactionState state)
boolean	willHealOnRetry(SQLException e)
protected boolean	willHealViaReparse(SQLException e)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.postgresql.core.QueryExecutor

createFastpathParameters, createSimpleQuery, execute, execute, fastpathCall, fetch, getApplicationName, getIntegerDateTimes, getProtocolVersion, getReplicationProtocol, getTimeZone, processNotifies, processNotifies, setBinaryReceiveOids, setBinarySendOids, startCopy, wrap

Methods inherited from interface org.postgresql.core.v3.TypeTransferModeRegistry

useBinaryForReceive, useBinaryForSend

Field Detail

pgStream

protected final PGStream pgStream

Constructor Detail

QueryExecutorBase

protected QueryExecutorBase(PGStream pgStream,
                            String user,
                            String database,
                            int cancelSignalTimeout,
                            Properties info)
                     throws SQLException

Throws:

SQLException

Method Detail

sendCloseMessage

protected abstract void sendCloseMessage()
                                  throws IOException

Throws:

IOException

getHostSpec

public HostSpec getHostSpec()

Specified by:

getHostSpec in interface QueryExecutor

Returns:

the host and port this connection is connected to.

getUser

public String getUser()

Specified by:

getUser in interface QueryExecutor

Returns:

the user this connection authenticated as.

getDatabase

public String getDatabase()

Specified by:

getDatabase in interface QueryExecutor

Returns:

the database this connection is connected to.

setBackendKeyData

public void setBackendKeyData(int cancelPid,
                              int cancelKey)

getBackendPID

public int getBackendPID()

Description copied from interface: QueryExecutor

Return the process ID (PID) of the backend server process handling this connection.

Specified by:

getBackendPID in interface QueryExecutor

Returns:

process ID (PID) of the backend server process handling this connection

abort

public void abort()

Description copied from interface: QueryExecutor

Abort at network level without sending the Terminate message to the backend.

Specified by:

abort in interface QueryExecutor

close

public void close()

Description copied from interface: QueryExecutor

Close this connection cleanly.

Specified by:

close in interface QueryExecutor

isClosed

public boolean isClosed()

Description copied from interface: QueryExecutor

Check if this connection is closed.

Specified by:

isClosed in interface QueryExecutor

Returns:

true iff the connection is closed.

sendQueryCancel

public void sendQueryCancel()
                     throws SQLException

Description copied from interface: QueryExecutor

Sends a query cancellation for this connection.

Specified by:

sendQueryCancel in interface QueryExecutor

Throws:

SQLException - if something goes wrong.

addWarning

public void addWarning(SQLWarning newWarning)

addNotification

public void addNotification(PGNotification notification)

getNotifications

public PGNotification[] getNotifications()
                                  throws SQLException

Description copied from interface: QueryExecutor

Retrieve and clear the set of asynchronous notifications pending on this connection.

Specified by:

getNotifications in interface QueryExecutor

Returns:

an array of notifications; if there are no notifications, an empty array is returned.

Throws:

SQLException - if and error occurs while fetching notifications

getWarnings

public SQLWarning getWarnings()

Description copied from interface: QueryExecutor

Retrieve and clear the chain of warnings accumulated on this connection.

Specified by:

getWarnings in interface QueryExecutor

Returns:

the first SQLWarning in the chain; subsequent warnings can be found via SQLWarning.getNextWarning().

getServerVersion

public String getServerVersion()

Description copied from interface: QueryExecutor

Return the server version from the server_version GUC. Note that there's no requirement for this to be numeric or of the form x.y.z. PostgreSQL development releases usually have the format x.ydevel e.g. 9.4devel; betas usually x.ybetan e.g. 9.4beta1. The --with-extra-version configure option may add an arbitrary string to this. Don't use this string for logic, only use it when displaying the server version to the user. Prefer getServerVersionNum() for all logic purposes.

Specified by:

getServerVersion in interface QueryExecutor

Returns:

the server version string from the server_version guc

getServerVersionNum

public int getServerVersionNum()

Description copied from interface: QueryExecutor

Get a machine-readable server version. This returns the value of the server_version_num GUC. If no such GUC exists, it falls back on attempting to parse the text server version for the major version. If there's no minor version (e.g. a devel or beta release) then the minor version is set to zero. If the version could not be parsed, zero is returned.

Specified by:

getServerVersionNum in interface QueryExecutor

Returns:

the server version in numeric XXYYZZ form, eg 090401, from server_version_num

setServerVersion

public void setServerVersion(String serverVersion)

setServerVersionNum

public void setServerVersionNum(int serverVersionNum)

setTransactionState

public void setTransactionState(TransactionState state)

setStandardConformingStrings

public void setStandardConformingStrings(boolean value)

getStandardConformingStrings

public boolean getStandardConformingStrings()

Description copied from interface: QueryExecutor

Returns whether the server treats string-literals according to the SQL standard or if it uses traditional PostgreSQL escaping rules. Versions up to 8.1 always treated backslashes as escape characters in string-literals. Since 8.2, this depends on the value of the standard_conforming_strings server variable.

Specified by:

getStandardConformingStrings in interface QueryExecutor

Returns:

true if the server treats string literals according to the SQL standard

getTransactionState

public TransactionState getTransactionState()

Description copied from interface: QueryExecutor

Get the current transaction state of this connection.

Specified by:

getTransactionState in interface QueryExecutor

Returns:

a ProtocolConnection.TRANSACTION_* constant.

setEncoding

public void setEncoding(Encoding encoding)
                 throws IOException

Throws:

IOException

getEncoding

public Encoding getEncoding()

Specified by:

getEncoding in interface QueryExecutor

Returns:

the current encoding in use by this connection

isReWriteBatchedInsertsEnabled

public boolean isReWriteBatchedInsertsEnabled()

Specified by:

isReWriteBatchedInsertsEnabled in interface QueryExecutor

borrowQuery

public final CachedQuery borrowQuery(String sql)
                              throws SQLException

Specified by:

borrowQuery in interface QueryExecutor

Throws:

SQLException

borrowCallableQuery

public final CachedQuery borrowCallableQuery(String sql)
                                      throws SQLException

Specified by:

borrowCallableQuery in interface QueryExecutor

Throws:

SQLException

borrowReturningQuery

public final CachedQuery borrowReturningQuery(String sql,
                                              String[] columnNames)
                                       throws SQLException

Specified by:

borrowReturningQuery in interface QueryExecutor

Throws:

SQLException

borrowQueryByKey

public CachedQuery borrowQueryByKey(Object key)
                             throws SQLException

Specified by:

borrowQueryByKey in interface QueryExecutor

Throws:

SQLException

releaseQuery

public void releaseQuery(CachedQuery cachedQuery)

Specified by:

releaseQuery in interface QueryExecutor

createQueryKey

public final Object createQueryKey(String sql,
                                   boolean escapeProcessing,
                                   boolean isParameterized,
                                   String... columnNames)

Specified by:

createQueryKey in interface QueryExecutor

createQueryByKey

public CachedQuery createQueryByKey(Object key)
                             throws SQLException

Specified by:

createQueryByKey in interface QueryExecutor

Throws:

SQLException

createQuery

public final CachedQuery createQuery(String sql,
                                     boolean escapeProcessing,
                                     boolean isParameterized,
                                     String... columnNames)
                              throws SQLException

Specified by:

createQuery in interface QueryExecutor

Throws:

SQLException

isColumnSanitiserDisabled

public boolean isColumnSanitiserDisabled()

Specified by:

isColumnSanitiserDisabled in interface QueryExecutor

getPreferQueryMode

public PreferQueryMode getPreferQueryMode()

Specified by:

getPreferQueryMode in interface QueryExecutor

getAutoSave

public AutoSave getAutoSave()

Specified by:

getAutoSave in interface QueryExecutor

setAutoSave

public void setAutoSave(AutoSave autoSave)

Specified by:

setAutoSave in interface QueryExecutor

willHealViaReparse

protected boolean willHealViaReparse(SQLException e)

willHealOnRetry

public boolean willHealOnRetry(SQLException e)

Specified by:

willHealOnRetry in interface QueryExecutor

isFlushCacheOnDeallocate

public boolean isFlushCacheOnDeallocate()

setFlushCacheOnDeallocate

public void setFlushCacheOnDeallocate(boolean flushCacheOnDeallocate)

Description copied from interface: QueryExecutor

By default, the connection resets statement cache in case deallocate all/discard all message is observed. This API allows to disable that feature for testing purposes.

Specified by:

setFlushCacheOnDeallocate in interface QueryExecutor

Parameters:

flushCacheOnDeallocate - true if statement cache should be reset when "deallocate/discard" message observed

hasNotifications

protected boolean hasNotifications()