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HHH-8228 - enable foreign keys in HANA dialects by defaulting to 'ON UPDATE CASCADE'

This commit is contained in:
Andrew Clemons 2013-10-29 07:48:55 +13:00 committed by Brett Meyer
parent f52c14a652
commit 4e527d0f3e
2 changed files with 10 additions and 20 deletions
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28
hibernate-core/src/main/java/org/hibernate/dialect/AbstractHANADialect.java
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@ -63,12 +63,10 @@ import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
/**
* An abstract base class for HANA dialects. <br/>
* <a href="http://help.sap.com/hana/html/sqlmain.html">SAP HANA Reference</a> <br/>
*
* NOTE: This dialect is currently configured to <b>not</b> create foreign keys by
* returning the empty string from {@link #getAddForeignKeyConstraintString} since they currently have caveats compared
* to other databases. This does not
* affect using this dialect with your own DDL scripts which use foreign keys.
*
*
* NOTE: This dialect is currently configured to create foreign keys with
* <code>on update cascade</code>.
*
* @author Andrew Clemons <andrew.clemons@sap.com>
*/
public abstract class AbstractHANADialect extends Dialect {
@ -574,14 +572,6 @@ public abstract class AbstractHANADialect extends Dialect {
return false;
}
@Override
public boolean supportsCascadeDelete() {
// HANA does support cascade deletes, but since we have (temporarily) overridden the foreign key support,
// this should also be false.
// TODO: Enable once FK support is solidified and getAddForeignKeyConstraintString is corrected.
return false;
}
@Override
public ScrollMode defaultScrollMode() {
return ScrollMode.FORWARD_ONLY;
@ -673,14 +663,14 @@ public abstract class AbstractHANADialect extends Dialect {
}
/**
* Currently disabling foreign key creation when using Hibernate's auto-ddl
* feature. HANA does allow creating foreign keys, but currently they do not always
* behave as expected.
* The default behaviour for 'on update restrict' on HANA is currently
* to not allow any updates to any column of a row if the row has a
* foreign key. Make the default for foreign keys have 'on update cascade'
* to work around the issue.
*/
@Override
public String getAddForeignKeyConstraintString(final String constraintName, final String[] foreignKey,
final String referencedTable, final String[] primaryKey, final boolean referencesPrimaryKey) {
// TODO: Re-evaluate in a later HANA release where, hopefully, this has been solidified.
return "";
return super.getAddForeignKeyConstraintString(constraintName, foreignKey, referencedTable, primaryKey, referencesPrimaryKey) + " on update cascade";
}
}

2
hibernate-core/src/main/java/org/hibernate/dialect/HANARowStoreDialect.java
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@ -31,7 +31,7 @@ package org.hibernate.dialect;
* @author Andrew Clemons <andrew.clemons@sap.com>
*/
public class HANARowStoreDialect extends AbstractHANADialect {
// Even though it's currently pointless, provide this structure in case HANA row store merits additional
// differences in the future.