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EclipseLink build based upon Git transaction ecdf3c32c4
/*
* Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2019, 2020 IBM Corporation. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
// 09/29/2016-2.7 Tomas Kraus
// - 426852: @GeneratedValue(strategy=GenerationType.IDENTITY) support in Oracle 12c
// 09/14/2017-2.6 Will Dazey
// - 522312: Add the eclipselink.sequencing.start-sequence-at-nextval property
// 02/20/2018-2.7 Will Dazey
// - 529602: Added support for CLOBs in DELETE statements for Oracle
package org.eclipse.persistence.internal.databaseaccess;
import java.io.IOException;
import java.io.Writer;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import java.util.Vector;
import org.eclipse.persistence.descriptors.DescriptorQueryManager;
import org.eclipse.persistence.exceptions.ConversionException;
import org.eclipse.persistence.exceptions.ValidationException;
import org.eclipse.persistence.expressions.Expression;
import org.eclipse.persistence.expressions.ExpressionOperator;
import org.eclipse.persistence.internal.helper.ClassConstants;
import org.eclipse.persistence.internal.helper.ConversionManager;
import org.eclipse.persistence.internal.helper.DatabaseField;
import org.eclipse.persistence.internal.helper.Helper;
import org.eclipse.persistence.internal.sessions.AbstractSession;
import org.eclipse.persistence.queries.Call;
import org.eclipse.persistence.queries.DataModifyQuery;
import org.eclipse.persistence.queries.DatabaseQuery;
import org.eclipse.persistence.queries.SQLCall;
import org.eclipse.persistence.queries.ValueReadQuery;
import org.eclipse.persistence.sequencing.DefaultSequence;
import org.eclipse.persistence.sequencing.QuerySequence;
import org.eclipse.persistence.sequencing.Sequence;
/**
* DatasourcePlatform is private to TopLink. It encapsulates behavior specific to a datasource platform
* (eg. Oracle, Sybase, DB2, Attunity, MQSeries), and provides protocol for TopLink to access this behavior.
*
* @see DatabasePlatform
* @see org.eclipse.persistence.eis.EISPlatform
*
* @since OracleAS TopLink 10g (10.0.3)
*/
public class DatasourcePlatform implements Platform {
/** Supporting name scopes in database by prefixing the table names with the table qualifier/creator. */
protected String tableQualifier;
/** Allow for conversion to be customized in the platform. */
protected transient ConversionManager conversionManager;
/** Store the query use to query the current server time. */
protected ValueReadQuery timestampQuery;
/** Operators specific to this platform */
protected transient Map platformOperators;
/** Store the list of Classes that can be converted to from the key. */
protected Hashtable dataTypesConvertedFromAClass;
/** Store the list of Classes that can be converted from to the key. */
protected Hashtable dataTypesConvertedToAClass;
/** Store default sequence */
protected Sequence defaultSequence;
/** Store map of sequence names to sequences */
protected Map sequences;
/** Delimiter to use for fields and tables using spaces or other special values */
protected String startDelimiter = null;
protected String endDelimiter = null;
/** Ensures that only one thread at a time can add/remove sequences */
protected Object sequencesLock = new Boolean(true);
/** If the native sequence type is not supported, if table sequencing should be used. */
protected boolean defaultNativeSequenceToTable;
/** If sequences should start at Next Value */
protected boolean defaultSeqenceAtNextValue;
public DatasourcePlatform() {
this.tableQualifier = "";
this.startDelimiter = "";
this.endDelimiter = "";
}
/**
* Return if the native sequence type is not supported, if table sequencing should be used.
*/
public boolean getDefaultNativeSequenceToTable() {
return defaultNativeSequenceToTable;
}
/**
* Set if the native sequence type is not supported, if table sequencing should be used.
*/
public void setDefaultNativeSequenceToTable(boolean defaultNativeSequenceToTable) {
this.defaultNativeSequenceToTable = defaultNativeSequenceToTable;
}
/**
* Return if the sequence generation should start at next value.
*/
public boolean getDefaultSeqenceAtNextValue() {
return defaultSeqenceAtNextValue;
}
/**
* Set if the sequence generation should start at next value.
*/
public void setDefaultSeqenceAtNextValue(boolean defaultSeqenceAtNextValue) {
this.defaultSeqenceAtNextValue = defaultSeqenceAtNextValue;
}
protected void addOperator(ExpressionOperator operator) {
platformOperators.put(Integer.valueOf(operator.getSelector()), operator);
}
/**
* Add the parameter.
* Convert the parameter to a string and write it.
*/
@Override
public void appendParameter(Call call, Writer writer, Object parameter) {
String parameterValue = (String)getConversionManager().convertObject(parameter, ClassConstants.STRING);
if (parameterValue == null) {
parameterValue = "";
}
try {
writer.write(parameterValue);
} catch (IOException exception) {
throw ValidationException.fileError(exception);
}
}
/**
* Allow for the platform to handle the representation of parameters specially.
*/
@Override
public Object getCustomModifyValueForCall(Call call, Object value, DatabaseField field, boolean shouldBind) {
return value;
}
/**
* Used by SQLCall.appendModify(..)
* If the field should be passed to customModifyInDatabaseCall, retun true,
* otherwise false.
* Methods shouldCustomModifyInDatabaseCall and customModifyInDatabaseCall should be
* kept in sync: shouldCustomModifyInDatabaseCall should return true if and only if the field
* is handled by customModifyInDatabaseCall.
*/
@Override
public boolean shouldUseCustomModifyForCall(DatabaseField field) {
return false;
}
@Override
public Object clone() {
try {
DatasourcePlatform clone = (DatasourcePlatform)super.clone();
clone.sequencesAfterCloneCleanup();
return clone;
} catch (CloneNotSupportedException exception) {
;//Do nothing
}
return null;
}
protected void sequencesAfterCloneCleanup() {
Sequence defaultSequenceClone = null;
if (hasDefaultSequence()) {
defaultSequenceClone = (Sequence)getDefaultSequence().clone();
setDefaultSequence(defaultSequenceClone);
}
if (getSequences() != null) {
HashMap sequencesCopy = new HashMap(getSequences());
HashMap sequencesDeepClone = new HashMap(getSequences().size());
Iterator it = sequencesCopy.values().iterator();
while (it.hasNext()) {
Sequence sequence = (Sequence)it.next();
if ((defaultSequenceClone != null) && (sequence == getDefaultSequence())) {
sequencesDeepClone.put(defaultSequenceClone.getName(), defaultSequenceClone);
} else {
Sequence sequenceClone = (Sequence)sequence.clone();
if (sequenceClone instanceof DefaultSequence) {
if (!((DefaultSequence)sequenceClone).hasPreallocationSize()) {
continue;
}
}
sequencesDeepClone.put(sequenceClone.getName(), sequenceClone);
}
}
this.setSequences(sequencesDeepClone);
}
}
/**
* Convert the object to the appropriate type by invoking the appropriate
* ConversionManager method
* @param object - the object that must be converted
* @param javaClass - the class that the object must be converted to
* @exception - ConversionException, all exceptions will be thrown as this type.
* @return - the newly converted object
*/
@Override
public Object convertObject(Object sourceObject, Class javaClass) throws ConversionException {
return getConversionManager().convertObject(sourceObject, javaClass);
}
/**
* Copy the state into the new platform.
*/
@Override
public void copyInto(Platform platform) {
if (!(platform instanceof DatasourcePlatform)) {
return;
}
DatasourcePlatform datasourcePlatform = (DatasourcePlatform)platform;
datasourcePlatform.setTableQualifier(getTableQualifier());
datasourcePlatform.setTimestampQuery(this.timestampQuery);
datasourcePlatform.setConversionManager(getConversionManager());
if (hasDefaultSequence()) {
datasourcePlatform.setDefaultSequence(getDefaultSequence());
}
datasourcePlatform.setSequences(getSequences());
datasourcePlatform.sequencesAfterCloneCleanup();
datasourcePlatform.setDefaultNativeSequenceToTable(getDefaultNativeSequenceToTable());
datasourcePlatform.setDefaultSeqenceAtNextValue(getDefaultSeqenceAtNextValue());
}
/**
* The platform hold its own instance of conversion manager to allow customization.
*/
@Override
public ConversionManager getConversionManager() {
// Lazy init for serialization.
if (conversionManager == null) {
//Clone the default to allow customers to easily override the conversion manager
conversionManager = (ConversionManager)ConversionManager.getDefaultManager().clone();
}
return conversionManager;
}
/**
* The platform hold its own instance of conversion manager to allow customization.
*/
@Override
public void setConversionManager(ConversionManager conversionManager) {
this.conversionManager = conversionManager;
}
/**
* Delimiter to use for fields and tables using spaces or other special values.
*
* Some databases use different delimiters for the beginning and end of the value.
* This delimiter indicates the end of the value.
*/
@Override
public String getEndDelimiter() {
return endDelimiter;
}
/**
* Delimiter to use for fields and tables using spaces or other special values.
*
* Some databases use different delimiters for the beginning and end of the value.
* This delimiter indicates the end of the value.
*/
public void setEndDelimiter(String endDelimiter) {
this.endDelimiter = endDelimiter;
}
/**
* Return the operator for the operator constant defined in ExpressionOperator.
*/
public ExpressionOperator getOperator(int selector) {
return (ExpressionOperator)getPlatformOperators().get(Integer.valueOf(selector));
}
/**
* Return any platform-specific operators
*/
public Map getPlatformOperators() {
if (platformOperators == null) {
synchronized (this) {
if (platformOperators == null) {
initializePlatformOperators();
}
}
}
return platformOperators;
}
/**
* OBSOLETE:
* This method lazy initializes the select sequence number query. It
* allows for other queries to be used instead of the default one.
*/
public ValueReadQuery getSelectSequenceQuery() {
if (getDefaultSequence() instanceof QuerySequence) {
return ((QuerySequence)getDefaultSequence()).getSelectQuery();
} else {
throw ValidationException.wrongSequenceType(Helper.getShortClassName(getDefaultSequence()), "getSelectQuery");
}
}
public int getSequencePreallocationSize() {
return getDefaultSequence().getPreallocationSize();
}
/**
* Delimiter to use for fields and tables using spaces or other special values.
*
* Some databases use different delimiters for the beginning and end of the value.
* This delimiter indicates the start of the value.
*/
@Override
public String getStartDelimiter() {
return startDelimiter;
}
/**
* Delimiter to use for fields and tables using spaces or other special values.
*
* Some databases use different delimiters for the beginning and end of the value.
* This delimiter indicates the start of the value.
*/
public void setStartDelimiter(String startDelimiter) {
this.startDelimiter = startDelimiter;
}
/**
* Return the qualifier for the table. Required by some
* databases such as Oracle and DB2
*/
@Override
public String getTableQualifier() {
return tableQualifier;
}
/**
* Answer the timestamp from the server.
*/
@Override
public java.sql.Timestamp getTimestampFromServer(AbstractSession session, String sessionName) {
if (getTimestampQuery() == null) {
return new java.sql.Timestamp(System.currentTimeMillis());
} else {
getTimestampQuery().setSessionName(sessionName);
return (java.sql.Timestamp)session.executeQuery(getTimestampQuery());
}
}
/**
* This method can be overridden by subclasses to return a
* query that will return the timestamp from the server.
* return null if the time should be the local time.
*/
@Override
public ValueReadQuery getTimestampQuery() {
return timestampQuery;
}
/**
* OBSOLETE:
* This method lazy initializes the update sequence number query. It
* allows for other queries to be used instead of the default one.
*/
public DataModifyQuery getUpdateSequenceQuery() {
if (getDefaultSequence() instanceof QuerySequence) {
return ((QuerySequence)getDefaultSequence()).getUpdateQuery();
} else {
throw ValidationException.wrongSequenceType(Helper.getShortClassName(getDefaultSequence()), "getUpdateQuery");
}
}
/**
* Initialize any platform-specific operators
*/
protected void initializePlatformOperators() {
this.platformOperators = new HashMap();
// Outer join
addOperator(ExpressionOperator.equalOuterJoin());
// General
addOperator(ExpressionOperator.toUpperCase());
addOperator(ExpressionOperator.toLowerCase());
addOperator(ExpressionOperator.chr());
addOperator(ExpressionOperator.concat());
addOperator(ExpressionOperator.hexToRaw());
addOperator(ExpressionOperator.initcap());
addOperator(ExpressionOperator.instring());
addOperator(ExpressionOperator.soundex());
addOperator(ExpressionOperator.leftPad());
addOperator(ExpressionOperator.leftTrim());
addOperator(ExpressionOperator.leftTrim2());
addOperator(ExpressionOperator.replace());
addOperator(ExpressionOperator.rightPad());
addOperator(ExpressionOperator.rightTrim());
addOperator(ExpressionOperator.rightTrim2());
addOperator(ExpressionOperator.substring());
addOperator(ExpressionOperator.substringSingleArg());
addOperator(ExpressionOperator.toNumber());
addOperator(ExpressionOperator.toChar());
addOperator(ExpressionOperator.toCharWithFormat());
addOperator(ExpressionOperator.translate());
addOperator(ExpressionOperator.trim());
addOperator(ExpressionOperator.trim2());
addOperator(ExpressionOperator.ascii());
addOperator(ExpressionOperator.length());
addOperator(ExpressionOperator.locate());
addOperator(ExpressionOperator.locate2());
addOperator(ExpressionOperator.nullIf());
addOperator(ExpressionOperator.ifNull());
addOperator(ExpressionOperator.cast());
addOperator(ExpressionOperator.regexp());
addOperator(ExpressionOperator.union());
addOperator(ExpressionOperator.unionAll());
addOperator(ExpressionOperator.intersect());
addOperator(ExpressionOperator.intersectAll());
addOperator(ExpressionOperator.except());
addOperator(ExpressionOperator.exceptAll());
// Date
addOperator(ExpressionOperator.addMonths());
addOperator(ExpressionOperator.dateToString());
addOperator(ExpressionOperator.lastDay());
addOperator(ExpressionOperator.monthsBetween());
addOperator(ExpressionOperator.nextDay());
addOperator(ExpressionOperator.roundDate());
addOperator(ExpressionOperator.toDate());
addOperator(ExpressionOperator.today());
addOperator(ExpressionOperator.currentDate());
addOperator(ExpressionOperator.currentTime());
addOperator(ExpressionOperator.extract());
// Math
addOperator(ExpressionOperator.simpleMath(ExpressionOperator.Add, "+"));
addOperator(ExpressionOperator.simpleMath(ExpressionOperator.Subtract, "-"));
addOperator(ExpressionOperator.simpleMath(ExpressionOperator.Multiply, "*"));
addOperator(ExpressionOperator.simpleMath(ExpressionOperator.Divide, "/"));
addOperator(ExpressionOperator.negate());
addOperator(ExpressionOperator.ceil());
addOperator(ExpressionOperator.cos());
addOperator(ExpressionOperator.cosh());
addOperator(ExpressionOperator.abs());
addOperator(ExpressionOperator.acos());
addOperator(ExpressionOperator.asin());
addOperator(ExpressionOperator.atan());
addOperator(ExpressionOperator.exp());
addOperator(ExpressionOperator.sqrt());
addOperator(ExpressionOperator.floor());
addOperator(ExpressionOperator.ln());
addOperator(ExpressionOperator.log());
addOperator(ExpressionOperator.mod());
addOperator(ExpressionOperator.power());
addOperator(ExpressionOperator.round());
addOperator(ExpressionOperator.sign());
addOperator(ExpressionOperator.sin());
addOperator(ExpressionOperator.sinh());
addOperator(ExpressionOperator.tan());
addOperator(ExpressionOperator.tanh());
addOperator(ExpressionOperator.trunc());
addOperator(ExpressionOperator.greatest());
addOperator(ExpressionOperator.least());
addOperator(ExpressionOperator.standardDeviation());
addOperator(ExpressionOperator.variance());
// Object-relational
addOperator(ExpressionOperator.deref());
addOperator(ExpressionOperator.ref());
addOperator(ExpressionOperator.refToHex());
addOperator(ExpressionOperator.value());
addOperator(ExpressionOperator.coalesce());
addOperator(ExpressionOperator.caseStatement());
addOperator(ExpressionOperator.caseConditionStatement());
}
/**
* INTERNAL:
* Allow the platform to initialize the CRUD queries to defaults.
* This is mainly used by EIS platforms, but could be used by relational ones for special behavior.
*/
public void initializeDefaultQueries(DescriptorQueryManager queryManager, AbstractSession session) {
}
@Override
public boolean isAccess() {
return false;
}
@Override
public boolean isAttunity() {
return false;
}
@Override
public boolean isCloudscape() {
return false;
}
@Override
public boolean isDerby() {
return false;
}
@Override
public boolean isDB2() {
return false;
}
@Override
public boolean isDB2Z() {
return false;
}
@Override
public boolean isHANA() {
return false;
}
@Override
public boolean isH2() {
return false;
}
@Override
public boolean isDBase() {
return false;
}
@Override
public boolean isHSQL() {
return false;
}
@Override
public boolean isInformix() {
return false;
}
@Override
public boolean isMySQL() {
return false;
}
@Override
public boolean isODBC() {
return false;
}
@Override
public boolean isOracle() {
return false;
}
@Override
public boolean isOracle9() {
return false;
}
public boolean isPervasive(){
return false;
}
@Override
public boolean isPostgreSQL(){
return false;
}
@Override
public boolean isPointBase() {
return false;
}
@Override
public boolean isSQLAnywhere() {
return false;
}
public boolean isFirebird() {
return false;
}
@Override
public boolean isSQLServer() {
return false;
}
@Override
public boolean isSybase() {
return false;
}
@Override
public boolean isSymfoware() {
return false;
}
@Override
public boolean isTimesTen() {
return false;
}
@Override
public boolean isTimesTen7() {
return false;
}
@Override
public boolean isMaxDB() {
return false;
}
/**
* Allow the platform to initialize itself after login/init.
*/
@Override
public void initialize() {
}
/**
* OBSOLETE:
* Can override the default query for returning the sequence numbers.
* This query must be a valid query that has one parameter which is
* the sequence name.
*/
public void setSelectSequenceNumberQuery(ValueReadQuery seqQuery) {
if (getDefaultSequence() instanceof QuerySequence) {
((QuerySequence)getDefaultSequence()).setSelectQuery(seqQuery);
} else {
throw ValidationException.wrongSequenceType(Helper.getShortClassName(getDefaultSequence()), "setSelectQuery");
}
}
/**
* Set the number of sequence values to preallocate.
* Preallocating sequence values can greatly improve insert performance.
*/
public void setSequencePreallocationSize(int size) {
getDefaultSequence().setPreallocationSize(size);
}
/**
* Set the qualifier for the table. Required by some
* databases such as Oracle and DB2
*/
@Override
public void setTableQualifier(String qualifier) {
tableQualifier = qualifier;
}
/**
* Can override the default query for returning a timestamp from the server.
* See: getTimestampFromServer
*/
@Override
public void setTimestampQuery(ValueReadQuery tsQuery) {
timestampQuery = tsQuery;
}
/**
* This method sets the update sequence number query. It
* allows for other queries to be used instead of the default one.
*/
public void setUpdateSequenceQuery(DataModifyQuery updateSequenceNumberQuery) {
if (getDefaultSequence() instanceof QuerySequence) {
((QuerySequence)getDefaultSequence()).setUpdateQuery(updateSequenceNumberQuery);
} else {
throw ValidationException.wrongSequenceType(Helper.getShortClassName(getDefaultSequence()), "setUpdateQuery");
}
}
@Override
public String toString() {
return Helper.getShortClassName(this.getClass());
}
/**
* PUBLIC:
* Return the list of Classes that can be converted to from the passed in javaClass.
* @param javaClass - the class that is converted from
* @return - a vector of classes
*/
public Vector getDataTypesConvertedFrom(Class javaClass) {
return getConversionManager().getDataTypesConvertedFrom(javaClass);
}
/**
* PUBLIC:
* Return the list of Classes that can be converted from to the passed in javaClass.
* @param javaClass - the class that is converted to
* @return - a vector of classes
*/
public Vector getDataTypesConvertedTo(Class javaClass) {
return getConversionManager().getDataTypesConvertedTo(javaClass);
}
/**
* Get default sequence
*/
@Override
public Sequence getDefaultSequence() {
if (!hasDefaultSequence()) {
setDefaultSequence(createPlatformDefaultSequence());
}
return defaultSequence;
}
/**
* Get default sequence
*/
public boolean hasDefaultSequence() {
return defaultSequence != null;
}
/**
* Set default sequence. In case the passed sequence is of type DefaultSequence - use platformDefaultSequence
* with name and size of the passed sequence.
*/
@Override
public void setDefaultSequence(Sequence sequence) {
if (sequence instanceof DefaultSequence) {
Sequence platformDefaultSequence = createPlatformDefaultSequence();
if (platformDefaultSequence != null) {
platformDefaultSequence.setName(sequence.getName());
if (((DefaultSequence)sequence).hasPreallocationSize()) {
platformDefaultSequence.setPreallocationSize(sequence.getPreallocationSize());
}
}
defaultSequence = platformDefaultSequence;
} else {
defaultSequence = sequence;
}
}
/**
* Add sequence corresponding to the name
*/
@Override
public void addSequence(Sequence sequence) {
addSequence(sequence, false);
}
/**
* Add sequence corresponding to the name.
* Use this method with isSessionConnected parameter set to true
* to add a sequence to connected session.
* If the session is connected then the sequence is added only
* if there is no sequence with the same name already in use.
*/
@Override
public void addSequence(Sequence sequence, boolean isSessionConnected) {
synchronized(sequencesLock) {
if (isSessionConnected) {
if (this.sequences == null) {
this.sequences = new HashMap();
this.sequences.put(sequence.getName(), sequence);
} else {
if (!this.sequences.containsKey(sequence.getName())) {
Map newSequences = (Map)((HashMap)this.sequences).clone();
newSequences.put(sequence.getName(), sequence);
this.sequences = newSequences;
}
}
} else {
if (this.sequences == null) {
this.sequences = new HashMap();
}
this.sequences.put(sequence.getName(), sequence);
}
}
}
/**
* Get sequence corresponding to the name
*/
@Override
public Sequence getSequence(String seqName) {
if (seqName == null) {
return getDefaultSequence();
} else {
if (this.sequences != null) {
return (Sequence)this.sequences.get(seqName);
} else {
return null;
}
}
}
/**
* INTERNAL:
* Create platform-default Sequence
*/
protected Sequence createPlatformDefaultSequence() {
throw ValidationException.createPlatformDefaultSequenceUndefined(Helper.getShortClassName(this));
}
/**
* Remove sequence corresponding to name.
* Doesn't remove default sequence.
*/
@Override
public Sequence removeSequence(String seqName) {
if (this.sequences != null) {
synchronized(sequencesLock) {
return (Sequence)this.sequences.remove(seqName);
}
} else {
return null;
}
}
/**
* Remove all sequences, but the default one.
*/
@Override
public void removeAllSequences() {
this.sequences = null;
}
/**
* INTERNAL:
* Returns a map of sequence names to Sequences (may be null).
*/
@Override
public Map getSequences() {
return this.sequences;
}
/**
* INTERNAL:
* Used only for writing into XML or Java.
*/
@Override
public Map getSequencesToWrite() {
if ((getSequences() == null) || getSequences().isEmpty()) {
return null;
}
Map sequencesCopy = new HashMap(getSequences());
Map sequencesToWrite = new HashMap();
Iterator it = sequencesCopy.values().iterator();
while (it.hasNext()) {
Sequence sequence = (Sequence)it.next();
if (!(sequence instanceof DefaultSequence) || ((DefaultSequence)sequence).hasPreallocationSize()) {
sequencesToWrite.put(sequence.getName(), sequence);
}
}
return sequencesToWrite;
}
/**
* INTERNAL:
* Used only for writing into XML or Java.
*/
@Override
public Sequence getDefaultSequenceToWrite() {
if (usesPlatformDefaultSequence()) {
return null;
} else {
return getDefaultSequence();
}
}
/**
* INTERNAL:
* Sets sequences - for XML support only
*/
@Override
public void setSequences(Map sequences) {
this.sequences = sequences;
}
/**
* INTERNAL:
* Indicates whether defaultSequence is the same as platform default sequence.
*/
@Override
public boolean usesPlatformDefaultSequence() {
if (!hasDefaultSequence()) {
return true;
} else {
return getDefaultSequence().equals(createPlatformDefaultSequence());
}
}
/**
* INTERNAL:
* Returns the correct quote character to use around SQL Identifiers that contain
* Space characters
* @deprecated
* @see getStartDelimiter()
* @see getEndDelimiter()
* @return The quote character for this platform
*/
@Deprecated
public String getIdentifierQuoteCharacter() {
return "";
}
/**
* INTERNAL:
*/
public ConnectionCustomizer createConnectionCustomizer(Accessor accessor, AbstractSession session) {
return null;
}
/**
* Allows query prepare to be disable in the platform.
* This is required for some EIS platforms, that cannot prepare the call.
*/
public boolean shouldPrepare(DatabaseQuery query) {
return true;
}
/**
* Return if the database requires the ORDER BY fields to be part of the select clause.
*/
public boolean shouldSelectIncludeOrderBy() {
return false;
}
/**
* Return if the database requires the ORDER BY fields to be part of the select clause.
*/
public boolean shouldSelectDistinctIncludeOrderBy() {
return true;
}
/**
* INTERNAL:
* Indicates whether a separate transaction is required for NativeSequence.
* This method is to be used *ONLY* by sequencing classes
*/
public boolean shouldNativeSequenceUseTransaction() {
return false;
}
/**
* INTERNAL:
* Indicates whether the platform supports identity.
* This method is to be used *ONLY* by sequencing classes
*/
public boolean supportsIdentity() {
return false;
}
public boolean supportsNativeSequenceNumbers() {
return this.supportsSequenceObjects() || this.supportsIdentity();
}
/**
* INTERNAL:
* Indicates whether the platform supports sequence objects.
* This method is to be used *ONLY* by sequencing classes
*/
public boolean supportsSequenceObjects() {
return false;
}
/**
* INTERNAL:
* Returns query used to read value generated by sequence object (like Oracle sequence).
* This method is called when sequence object NativeSequence is connected,
* the returned query used until the sequence is disconnected.
* If the platform supportsSequenceObjects then (at least) one of buildSelectQueryForSequenceObject
* methods should return non-null query.
*/
public ValueReadQuery buildSelectQueryForSequenceObject() {
return null;
}
/**
* INTERNAL:
* Returns query used to read value generated by sequence object (like Oracle sequence).
* In case the other version of this method (taking no parameters) returns null,
* this method is called every time sequence object NativeSequence reads.
* If the platform supportsSequenceObjects then (at least) one of buildSelectQueryForSequenceObject
* methods should return non-null query.
*/
public ValueReadQuery buildSelectQueryForSequenceObject(String qualifiedSeqName, Integer size) {
return null;
}
/**
* INTERNAL:
* Returns query used to read back the value generated by Identity.
* This method is called when identity NativeSequence is connected,
* the returned query used until the sequence is disconnected.
* If the platform supportsIdentity then (at least) one of buildSelectQueryForIdentity
* methods should return non-null query.
*/
public ValueReadQuery buildSelectQueryForIdentity() {
return null;
}
/**
* INTERNAL:
* Returns query used to read back the value generated by Identity.
* In case the other version of this method (taking no parameters) returns null,
* this method is called every time identity NativeSequence reads.
* If the platform supportsIdentity then (at least) one of buildSelectQueryForIdentity
* methods should return non-null query.
*/
public ValueReadQuery buildSelectQueryForIdentity(String seqName, Integer size) {
return null;
}
/**
* INTERNAL:
* Return the correct call type for the native query string.
* This allows EIS platforms to use different types of native calls.
*/
public DatasourceCall buildNativeCall(String queryString) {
return new SQLCall(queryString);
}
/**
* INTERNAL:
* Override this method if the platform needs to use a custom function based on the DatabaseField
* @return An expression for the given field set equal to a parameter matching the field
*/
public Expression createExpressionFor(DatabaseField field, Expression builder) {
Expression subExp1 = builder.getField(field);
Expression subExp2 = builder.getParameter(field);
return subExp1.equal(subExp2);
}
/**
* INTERNAL:
* Some database platforms have a limit for the number of parameters in an IN clause.
*/
public int getINClauseLimit() {
return 0;
}
}