HHH-18221 Fix for Incomplete list of existing foreign keys - DatabaseMetaData.crossReferences(...) not used

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/InformixDialect.java

@@ -573,6 +573,26 @@ public class InformixDialect extends Dialect {
 		return BeforeUseAction.CREATE;
 	}
 
+	@Override
+	public String[] getCreateSchemaCommand(String schemaName) {
+		return new String[] { "create schema authorization " + schemaName };
+	}
+
+	@Override
+	public String[] getDropSchemaCommand(String schemaName) {
+		return new String[] { "" };
+	}
+
+	@Override
+	public boolean useCrossReferenceForeignKeys(){
+		return true;
+	}
+
+	@Override
+	public String getCrossReferenceParentTableFilter(){
+		return "%";
+	}
+
 	@Override
 	public UniqueDelegate getUniqueDelegate() {
 		return uniqueDelegate;

hibernate-core/src/main/java/org/hibernate/dialect/Dialect.java

@@ -2612,6 +2612,23 @@ public abstract class Dialect implements ConversionContext, TypeContributor, Fun
 				+ " " + foreignKeyDefinition;
 	}
 
+	/**
+	 * Does the dialect also need cross-references to get a complete
+	 * list of foreign keys?
+	 */
+	public boolean useCrossReferenceForeignKeys(){
+		return false;
+	}
+
+	/**
+	 * Some dialects require a not null primaryTable filter.
+	 * Sometimes a wildcard entry is sufficient for the like condition.
+	 * @return
+	 */
+	public String getCrossReferenceParentTableFilter(){
+		return null;
+	}
+
 	/**
 	 * The syntax used to add a primary key constraint to a table.
 	 *

hibernate-core/src/main/java/org/hibernate/tool/schema/extract/internal/AbstractInformationExtractorImpl.java

@@ -1264,6 +1264,92 @@ public abstract class AbstractInformationExtractorImpl implements InformationExt
 			ExtractionContext.ResultSetProcessor<T> processor
 	) throws SQLException;
 
+	/**
+	 * Must do the following:
+	 * <ol>
+	 *     <li>
+	 *         obtain a {@link ResultSet} containing a row for each foreign key
+	 *         column making up a foreign key for any existing
+	 *         foreignCatalog/foreignSchema/foreignTable combination as specified by
+	 *         parameters described below.
+	 *         The {@link ResultSet} must contain the following, consistent
+	 *         with the corresponding columns returned by {@link DatabaseMetaData#getCrossReference}:
+	 *         <ul>
+	 *             <li>
+	 *                 column label {@link #getResultSetForeignKeyLabel} -
+	 *                 foreign key name (may be null)
+	 *             </li>
+	 *             <li>
+	 *                 column label {@link #getResultSetPrimaryKeyCatalogLabel} -
+	 *                 primary key table catalog being imported (may be null)
+	 *             </li>
+	 *             <li>
+	 *                 column label {@link #getResultSetPrimaryKeySchemaLabel} -
+	 *                 primary key table schema being imported (may be null)
+	 *             </li>
+	 *             <li>
+	 *                 column label {@link #getResultSetPrimaryKeyTableLabel} -
+	 *                 primary key table name being imported
+	 *             </li>
+	 *             <li>
+	 *                 column label {@link #getResultSetForeignKeyColumnNameLabel} -
+	 *                 foreign key column name
+	 *             </li>
+	 *             <li>
+	 *                 column label {@link #getResultSetPrimaryKeyColumnNameLabel} -
+	 *                 primary key column name being imported
+	 *             </li>
+	 *         </ul>
+	 *         The ResultSet must be ordered by the primary key
+	 *         foreignCatalog/foreignSchema/foreignTable and column position within the key.
+	 *     </li>
+	 *     <li> execute {@code processor.process( resultSet )};</li>
+	 *     <li>
+	 *         release resources whether {@code processor.process( resultSet )}
+	 *         executes successfully or not.
+	 *     </li>
+	 * </ol>
+	 * <p>
+	 * The {@code parentCatalog}, {@code parentSchema}, {@code parentTable},
+	 * {@code foreignCatalog}, {@code foreignSchema}, {@code foreignTable}
+	 * parameters are as specified by {@link DatabaseMetaData#getCrossReference(
+	 * String, String, String, String, String, String)}
+	 * and are copied here:
+	 *
+	 * @param parentCatalog a catalog name; must match the catalog name
+	 * as it is stored in the database; "" retrieves those without a
+	 * catalog; {@code null} means drop catalog name from the selection criteria
+	 * @param parentSchema a schema name; must match the schema name as
+	 * it is stored in the database; "" retrieves those without a schema;
+	 * {@code null} means drop schema name from the selection criteria
+	 * @param parentTable the name of the table that exports the key; must match
+	 * the table name as it is stored in the database
+	 * @param foreignCatalog a catalog name; must match the catalog name as
+	 * it is stored in the database; "" retrieves those without a
+	 * catalog; {@code null} means drop catalog name from the selection criteria
+	 * @param foreignSchema a schema name; must match the schema name as it
+	 * is stored in the database; "" retrieves those without a schema;
+	 * {@code null} means drop schema name from the selection criteria
+	 * @param foreignTable the name of the table that imports the key; must match
+	 * the table name as it is stored in the database
+	 * @param processor - the provided ResultSetProcessor.
+	 * @param <T> - defined by {@code processor}
+	 * @return - defined by {@code processor}
+	 * @throws SQLException - if a database error occurs
+	 * @see #processImportedKeysResultSet(String, String, String,
+	 * ExtractionContext.ResultSetProcessor)
+	 */
+	protected abstract <T> T processCrossReferenceResultSet(
+			String parentCatalog,
+			String parentSchema,
+			String parentTable,
+			String foreignCatalog,
+			String foreignSchema,
+			String foreignTable,
+			ExtractionContext.ResultSetProcessor<T> processor
+	) throws SQLException;
+
+
 	@Override
 	public Iterable<ForeignKeyInformation> getForeignKeys(TableInformation tableInformation) {
 		final Map<Identifier, ForeignKeyBuilder> fkBuilders = new HashMap<>();
@@ -1289,13 +1375,7 @@ public abstract class AbstractInformationExtractorImpl implements InformationExt
 		}
 
 		try {
-			processImportedKeysResultSet(
+			ExtractionContext.ResultSetProcessor<Void> processor = resultSet -> {
-					catalogFilter,
-					schemaFilter,
-					tableInformation.getName().getTableName().getText(),
-					resultSet -> {
-						// todo : need to account for getCrossReference() as well...
-
 				while ( resultSet.next() ) {
 					// IMPL NOTE : The builder is mainly used to collect the column reference mappings
 					final Identifier fkIdentifier = DatabaseIdentifier.toIdentifier(
@@ -1333,9 +1413,25 @@ public abstract class AbstractInformationExtractorImpl implements InformationExt
 					);
 				}
 				return null;
-					}
+			};
+			processImportedKeysResultSet(
+					catalogFilter,
+					schemaFilter,
+					tableInformation.getName().getTableName().getText(),
+					processor);
+			final Dialect dialect = extractionContext.getJdbcEnvironment().getDialect();
+			if (dialect.useCrossReferenceForeignKeys()) {
+				processCrossReferenceResultSet(
+						null,
+						null,
+						dialect.getCrossReferenceParentTableFilter(),
+						catalogFilter,
+						schemaFilter,
+						tableInformation.getName().getTableName().getText(),
+						processor
 				);
 			}
+		}
 		catch (SQLException e) {
 			throw convertSQLException(
 					e,

hibernate-core/src/main/java/org/hibernate/tool/schema/extract/internal/InformationExtractorJdbcDatabaseMetaDataImpl.java

@@ -134,6 +134,26 @@ public class InformationExtractorJdbcDatabaseMetaDataImpl extends AbstractInform
 		}
 	}
 
+	@Override
+	protected <T> T processCrossReferenceResultSet(
+			String parentCatalog,
+			String parentSchema,
+			String parentTable,
+			String foreignCatalog,
+			String foreignSchema,
+			String foreignTable,
+			ExtractionContext.ResultSetProcessor<T> processor) throws SQLException {
+		try (ResultSet resultSet = getExtractionContext().getJdbcDatabaseMetaData().getCrossReference(
+				parentCatalog,
+				parentSchema,
+				parentTable,
+				foreignCatalog,
+				foreignSchema,
+				foreignTable) ) {
+			return processor.process( resultSet );
+		}
+	}
+
 	protected void addColumns(TableInformation tableInformation) {
 		final Dialect dialect = getExtractionContext().getJdbcEnvironment().getDialect();