org.postgresql.core

Interface BaseConnection

All Superinterfaces:

AutoCloseable, Connection, PGConnection, Wrapper

All Known Implementing Classes:

PgConnection

public interface BaseConnection
extends PGConnection, Connection

Driver-internal connection interface. Application code should not use this interface.

Field Summary

Fields inherited from interface java.sql.Connection

TRANSACTION_NONE, TRANSACTION_READ_COMMITTED, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE

Method Summary

Methods

Modifier and Type	Method and Description
void	addTimerTask(TimerTask timerTask, long milliSeconds) Schedule a TimerTask for later execution.
boolean	binaryTransferSend(int oid) Returns true if value for the given oid should be sent using binary transfer.
void	cancelQuery() Cancel the current query executing on this connection.
CachedQuery	createQuery(String sql, boolean escapeProcessing, boolean isParameterized, String... columnNames)
byte[]	encodeString(String str) Encode a string using the database's client_encoding (usually UTF8, but can vary on older server versions).
String	escapeString(String str) Escapes a string for use as string-literal within an SQL command.
ResultSet	execSQLQuery(String s) Execute a SQL query that returns a single resultset.
ResultSet	execSQLQuery(String s, int resultSetType, int resultSetConcurrency)
void	execSQLUpdate(String s) Execute a SQL query that does not return results.
Encoding	getEncoding()
LruCache<FieldMetadata.Key,FieldMetadata>	getFieldMetadataCache() Return metadata cache for given connection
Logger	getLogger()
Object	getObject(String type, String value, byte[] byteValue) Construct and return an appropriate object for the given type and value.
QueryExecutor	getQueryExecutor() Get the QueryExecutor implementation for this connection.
boolean	getStandardConformingStrings() Returns whether the server treats string-literals according to the SQL standard or if it uses traditional PostgreSQL escaping rules.
boolean	getStringVarcharFlag()
TimestampUtils	getTimestampUtils()
TransactionState	getTransactionState() Get the current transaction state of this connection.
TypeInfo	getTypeInfo()
boolean	haveMinimumCompatibleVersion(int ver) Check if we should use driver behaviour introduced in a particular driver version.
boolean	haveMinimumCompatibleVersion(String ver) Deprecated. Avoid using this in new code that can require PgJDBC 9.4.
boolean	haveMinimumCompatibleVersion(Version ver) Check if we should use driver behaviour introduced in a particular driver version.
boolean	haveMinimumServerVersion(int ver) Check if we have at least a particular server version.
boolean	haveMinimumServerVersion(String ver) Deprecated. Use haveMinimumServerVersion(int) instead
boolean	haveMinimumServerVersion(Version ver) Check if we have at least a particular server version.
boolean	isColumnSanitiserDisabled() Return whether to disable column name sanitation.
void	purgeTimerTasks() Invoke purge() on the underlying shared Timer so that internal resources will be released.
void	setFlushCacheOnDeallocate(boolean flushCacheOnDeallocate) By default, the connection resets statement cache in case deallocate all/discard all message is observed.

Methods inherited from interface org.postgresql.PGConnection

addDataType, addDataType, escapeIdentifier, escapeLiteral, getAutosave, getBackendPID, getCopyAPI, getDefaultFetchSize, getFastpathAPI, getLargeObjectAPI, getNotifications, getPreferQueryMode, getPrepareThreshold, setAutosave, setDefaultFetchSize, setPrepareThreshold

Methods inherited from interface java.sql.Connection

abort, clearWarnings, close, commit, createArrayOf, createBlob, createClob, createNClob, createSQLXML, createStatement, createStatement, createStatement, createStruct, getAutoCommit, getCatalog, getClientInfo, getClientInfo, getHoldability, getMetaData, getNetworkTimeout, getSchema, getTransactionIsolation, getTypeMap, getWarnings, isClosed, isReadOnly, isValid, nativeSQL, prepareCall, prepareCall, prepareCall, prepareStatement, prepareStatement, prepareStatement, prepareStatement, prepareStatement, prepareStatement, releaseSavepoint, rollback, rollback, setAutoCommit, setCatalog, setClientInfo, setClientInfo, setHoldability, setNetworkTimeout, setReadOnly, setSavepoint, setSavepoint, setSchema, setTransactionIsolation, setTypeMap

Methods inherited from interface java.sql.Wrapper

isWrapperFor, unwrap

Method Detail

cancelQuery

void cancelQuery()
                 throws SQLException

Cancel the current query executing on this connection.

Throws:

SQLException - if something goes wrong.

execSQLQuery

ResultSet execSQLQuery(String s)
                       throws SQLException

Execute a SQL query that returns a single resultset. Never causes a new transaction to be started regardless of the autocommit setting.

Parameters:

s - the query to execute

Returns:

the (non-null) returned resultset

Throws:

SQLException - if something goes wrong.

execSQLQuery

ResultSet execSQLQuery(String s,
                     int resultSetType,
                     int resultSetConcurrency)
                       throws SQLException

Throws:

SQLException

execSQLUpdate

void execSQLUpdate(String s)
                   throws SQLException

Execute a SQL query that does not return results. Never causes a new transaction to be started regardless of the autocommit setting.

Parameters:

s - the query to execute

Throws:

SQLException - if something goes wrong.

getQueryExecutor

QueryExecutor getQueryExecutor()

Get the QueryExecutor implementation for this connection.

Returns:

the (non-null) executor

getObject

Object getObject(String type,
               String value,
               byte[] byteValue)
                 throws SQLException

Construct and return an appropriate object for the given type and value. This only considers the types registered via PGConnection.addDataType(String, Class) and PGConnection.addDataType(String, String).

If no class is registered as handling the given type, then a generic PGobject instance is returned.

Parameters:

type - the backend typename

value - the type-specific string representation of the value

byteValue - the type-specific binary representation of the value

Returns:

an appropriate object; never null.

Throws:

SQLException - if something goes wrong

getEncoding

Encoding getEncoding()
                     throws SQLException

Throws:

SQLException

getTypeInfo

TypeInfo getTypeInfo()

haveMinimumCompatibleVersion

@Deprecated
boolean haveMinimumCompatibleVersion(String ver)

Deprecated. Avoid using this in new code that can require PgJDBC 9.4.

Check if we should use driver behaviour introduced in a particular driver version. This defaults to behaving as the actual driver's version but can be overridden by the "compatible" URL parameter. If possible you should use the integer version of this method instead. It was introduced with the 9.4 driver release.

Parameters:

ver - the driver version to check

Returns:

true if the driver's behavioural version is at least "ver".

haveMinimumCompatibleVersion

boolean haveMinimumCompatibleVersion(int ver)

Check if we should use driver behaviour introduced in a particular driver version. This defaults to behaving as the actual driver's version but can be overridden by the "compatible" URL parameter. The version is of the form xxyyzz, e.g. 90401 for PgJDBC 9.4.1. This is used to toggle between different functionality as it changes across different releases of the jdbc driver code. The values here are versions of the jdbc client and not server versions. For example in 7.1 get/setBytes worked on LargeObject values, in 7.2 these methods were changed to work on bytea values. This change in functionality could be disabled by setting the "compatible" level to be 7.1, in which case the driver will revert to the 7.1 functionality.

Parameters:

ver - the driver version to check, eg 90401 for 9.4.1

Returns:

true if the driver's behavioural version is at least "ver".

haveMinimumCompatibleVersion

boolean haveMinimumCompatibleVersion(Version ver)

Check if we should use driver behaviour introduced in a particular driver version. This defaults to behaving as the actual driver's version but can be overridden by the "compatible" URL parameter.

Parameters:

ver - the driver version to check

Returns:

true if the driver's behavioural version is at least "ver".

haveMinimumServerVersion

@Deprecated
boolean haveMinimumServerVersion(String ver)

Deprecated. Use haveMinimumServerVersion(int) instead

Check if we have at least a particular server version.

Parameters:

ver - the server version to check

Returns:

true if the server version is at least "ver".

haveMinimumServerVersion

boolean haveMinimumServerVersion(int ver)

Check if we have at least a particular server version. The input version is of the form xxyyzz, matching a PostgreSQL version like xx.yy.zz. So 9.0.12 is 90012 .

Parameters:

ver - the server version to check, of the form xxyyzz eg 90401

Returns:

true if the server version is at least "ver".

haveMinimumServerVersion

boolean haveMinimumServerVersion(Version ver)

Check if we have at least a particular server version. The input version is of the form xxyyzz, matching a PostgreSQL version like xx.yy.zz. So 9.0.12 is 90012 .

Parameters:

ver - the server version to check

Returns:

true if the server version is at least "ver".

encodeString

byte[] encodeString(String str)
                    throws SQLException

Encode a string using the database's client_encoding (usually UTF8, but can vary on older server versions). This is used when constructing synthetic resultsets (for example, in metadata methods).

Parameters:

str - the string to encode

Returns:

an encoded representation of the string

Throws:

SQLException - if something goes wrong.

escapeString

String escapeString(String str)
                    throws SQLException

Escapes a string for use as string-literal within an SQL command. The method chooses the applicable escaping rules based on the value of getStandardConformingStrings().

Parameters:

str - a string value

Returns:

the escaped representation of the string

Throws:

SQLException - if the string contains a \0 character

getStandardConformingStrings

boolean getStandardConformingStrings()

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.

Returns:

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

See Also:

QueryExecutor.getStandardConformingStrings()

getTimestampUtils

TimestampUtils getTimestampUtils()

getLogger

Logger getLogger()

getStringVarcharFlag

boolean getStringVarcharFlag()

getTransactionState

TransactionState getTransactionState()

Get the current transaction state of this connection.

Returns:

current transaction state of this connection

binaryTransferSend

boolean binaryTransferSend(int oid)

Returns true if value for the given oid should be sent using binary transfer. False if value should be sent using text transfer.

Parameters:

oid - The oid to check.

Returns:

True for binary transfer, false for text transfer.

isColumnSanitiserDisabled

boolean isColumnSanitiserDisabled()

Return whether to disable column name sanitation.

Returns:

true column sanitizer is disabled

addTimerTask

void addTimerTask(TimerTask timerTask,
                long milliSeconds)

Schedule a TimerTask for later execution. The task will be scheduled with the shared Timer for this connection.

Parameters:

timerTask - timer task to schedule

milliSeconds - delay in milliseconds

purgeTimerTasks

void purgeTimerTasks()

Invoke purge() on the underlying shared Timer so that internal resources will be released.

getFieldMetadataCache

LruCache<FieldMetadata.Key,FieldMetadata> getFieldMetadataCache()

Return metadata cache for given connection

Returns:

metadata cache

createQuery

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

Throws:

SQLException

setFlushCacheOnDeallocate

void setFlushCacheOnDeallocate(boolean flushCacheOnDeallocate)

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.

Parameters:

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