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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hive.service.cli.operation;
import java.util.Collections;
import java.util.List;
import org.apache.hadoop.hive.metastore.IMetaStoreClient;
import org.apache.hadoop.hive.metastore.api.ForeignKeysRequest;
import org.apache.hadoop.hive.metastore.api.SQLForeignKey;
import org.apache.hive.service.cli.FetchOrientation;
import org.apache.hive.service.cli.HiveSQLException;
import org.apache.hive.service.cli.OperationState;
import org.apache.hive.service.cli.OperationType;
import org.apache.hive.service.cli.RowSet;
import org.apache.hive.service.cli.RowSetFactory;
import org.apache.hive.service.cli.TableSchema;
import org.apache.hadoop.hive.serde2.thrift.Type;
import org.apache.hive.service.cli.session.HiveSession;
/**
* GetCrossReferenceOperation.
*
*/
public class GetCrossReferenceOperation extends MetadataOperation {
/**
PKTABLE_CAT String => parent key table catalog (may be null)
PKTABLE_SCHEM String => parent key table schema (may be null)
PKTABLE_NAME String => parent key table name
PKCOLUMN_NAME String => parent key column name
FKTABLE_CAT String => foreign key table catalog (may be null) being exported (may be null)
FKTABLE_SCHEM String => foreign key table schema (may be null) being exported (may be null)
FKTABLE_NAME String => foreign key table name being exported
FKCOLUMN_NAME String => foreign key column name being exported
KEY_SEQ short => sequence number within foreign key( a value of 1 represents the first column of the foreign key, a value of 2 would represent the second column within the foreign key).
UPDATE_RULE short => What happens to foreign key when parent key is updated:
importedNoAction - do not allow update of parent key if it has been imported
importedKeyCascade - change imported key to agree with parent key update
importedKeySetNull - change imported key to NULL if its parent key has been updated
importedKeySetDefault - change imported key to default values if its parent key has been updated
importedKeyRestrict - same as importedKeyNoAction (for ODBC 2.x compatibility)
DELETE_RULE short => What happens to the foreign key when parent key is deleted.
importedKeyNoAction - do not allow delete of parent key if it has been imported
importedKeyCascade - delete rows that import a deleted key
importedKeySetNull - change imported key to NULL if its primary key has been deleted
importedKeyRestrict - same as importedKeyNoAction (for ODBC 2.x compatibility)
importedKeySetDefault - change imported key to default if its parent key has been deleted
FK_NAME String => foreign key name (may be null)
PK_NAME String => parent key name (may be null)
DEFERRABILITY short => can the evaluation of foreign key constraints be deferred until commit
importedKeyInitiallyDeferred - see SQL92 for definition
importedKeyInitiallyImmediate - see SQL92 for definition
importedKeyNotDeferrable - see SQL92 for definition
*/
private static final TableSchema RESULT_SET_SCHEMA = new TableSchema()
.addPrimitiveColumn("PKTABLE_CAT", Type.STRING_TYPE,
"Parent key table catalog (may be null)")
.addPrimitiveColumn("PKTABLE_SCHEM", Type.STRING_TYPE,
"Parent key table schema (may be null)")
.addPrimitiveColumn("PKTABLE_NAME", Type.STRING_TYPE,
"Parent Key table name")
.addPrimitiveColumn("PKCOLUMN_NAME", Type.STRING_TYPE,
"Parent Key column name")
.addPrimitiveColumn("FKTABLE_CAT", Type.STRING_TYPE,
"Foreign key table catalog (may be null)")
.addPrimitiveColumn("FKTABLE_SCHEM", Type.STRING_TYPE,
"Foreign key table schema (may be null)")
.addPrimitiveColumn("FKTABLE_NAME", Type.STRING_TYPE,
"Foreign Key table name")
.addPrimitiveColumn("FKCOLUMN_NAME", Type.STRING_TYPE,
"Foreign Key column name")
.addPrimitiveColumn("KEQ_SEQ", Type.INT_TYPE,
"Sequence number within primary key")
.addPrimitiveColumn("UPDATE_RULE", Type.INT_TYPE,
"What happens to foreign key when parent key is updated")
.addPrimitiveColumn("DELETE_RULE", Type.INT_TYPE,
"What happens to foreign key when parent key is deleted")
.addPrimitiveColumn("FK_NAME", Type.STRING_TYPE,
"Foreign key name (may be null)")
.addPrimitiveColumn("PK_NAME", Type.STRING_TYPE,
"Primary key name (may be null)")
.addPrimitiveColumn("DEFERRABILITY", Type.INT_TYPE,
"Can the evaluation of foreign key constraints be deferred until commit");
private final String parentCatalogName;
private final String parentSchemaName;
private final String parentTableName;
private final String foreignCatalogName;
private final String foreignSchemaName;
private final String foreignTableName;
private final RowSet rowSet;
public GetCrossReferenceOperation(HiveSession parentSession,
String parentCatalogName, String parentSchemaName, String parentTableName,
String foreignCatalog, String foreignSchema, String foreignTable) {
super(parentSession, OperationType.GET_FUNCTIONS);
this.parentCatalogName = parentCatalogName;
this.parentSchemaName = parentSchemaName;
this.parentTableName = parentTableName;
this.foreignCatalogName = foreignCatalog;
this.foreignSchemaName = foreignSchema;
this.foreignTableName = foreignTable;
this.rowSet = RowSetFactory.create(RESULT_SET_SCHEMA, getProtocolVersion(), false);
log.info("Starting GetCrossReferenceOperation with the following parameters:"
+ " parentCatalogName={}, parentSchemaName={}, parentTableName={}, foreignCatalog={}, "
+ "foreignSchema={}, foreignTable={}", parentCatalogName, parentSchemaName,
parentTableName, foreignCatalog, foreignSchema, foreignTable);
}
@Override
public void runInternal() throws HiveSQLException {
setState(OperationState.RUNNING);
log.info("Fetching cross reference metadata");
try {
IMetaStoreClient metastoreClient = getParentSession().getMetaStoreClient();
ForeignKeysRequest fkReq = new ForeignKeysRequest(parentSchemaName, parentTableName, foreignSchemaName, foreignTableName);
List fks = metastoreClient.getForeignKeys(fkReq);
if (fks == null) {
return;
}
for (SQLForeignKey fk : fks) {
Object[] rowData = new Object[] {parentCatalogName,
fk.getPktable_db(), fk.getPktable_name(), fk.getPkcolumn_name(),
foreignCatalogName,
fk.getFktable_db(), fk.getFktable_name(), fk.getFkcolumn_name(),
fk.getKey_seq(), fk.getUpdate_rule(), fk.getDelete_rule(), fk.getFk_name(),
fk.getPk_name(), 0};
rowSet.addRow(rowData);
if (log.isDebugEnabled()) {
String debugMessage = getDebugMessage("cross reference", RESULT_SET_SCHEMA);
log.debug(debugMessage, rowData);
}
}
if (log.isDebugEnabled() && rowSet.numRows() == 0) {
log.debug("No cross reference metadata has been returned.");
}
setState(OperationState.FINISHED);
log.info("Fetching cross reference metadata has been successfully finished");
} catch (Exception e) {
setState(OperationState.ERROR);
throw new HiveSQLException(e);
}
}
/* (non-Javadoc)
* @see org.apache.hive.service.cli.Operation#getResultSetSchema()
*/
@Override
public TableSchema getResultSetSchema() throws HiveSQLException {
assertState(Collections.singleton(OperationState.FINISHED));
return RESULT_SET_SCHEMA;
}
/* (non-Javadoc)
* @see org.apache.hive.service.cli.Operation#getNextRowSet(org.apache.hive.service.cli.FetchOrientation, long)
*/
@Override
public RowSet getNextRowSet(FetchOrientation orientation, long maxRows) throws HiveSQLException {
assertState(Collections.singleton(OperationState.FINISHED));
validateDefaultFetchOrientation(orientation);
if (orientation.equals(FetchOrientation.FETCH_FIRST)) {
rowSet.setStartOffset(0);
}
return rowSet.extractSubset((int)maxRows);
}
}
