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package org.hsqldb;
import org.hsqldb.ParserDQL.CompileContext;
import org.hsqldb.navigator.RowSetNavigator;
import org.hsqldb.navigator.RowSetNavigatorClient;
import org.hsqldb.persist.PersistentStore;
import org.hsqldb.result.Result;
import org.hsqldb.result.ResultConstants;
import org.hsqldb.types.Type;
/**
* Implementation of Statement for INSERT statements.<p>
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.2.6
* @since 1.9.0
*/
public class StatementInsert extends StatementDML {
int overrideUserValue = -1;
/**
* Instantiate this as an INSERT_VALUES statement.
*/
StatementInsert(Session session, Table targetTable, int[] columnMap,
Expression insertExpression, boolean[] checkColumns,
CompileContext compileContext) {
super(StatementTypes.INSERT, StatementTypes.X_SQL_DATA_CHANGE,
session.getCurrentSchemaHsqlName());
this.targetTable = targetTable;
this.baseTable = targetTable.isTriggerInsertable() ? targetTable
: targetTable
.getBaseTable();
this.insertColumnMap = columnMap;
this.insertCheckColumns = checkColumns;
this.insertExpression = insertExpression;
setupChecks();
setDatabseObjects(session, compileContext);
checkAccessRights(session);
isSimpleInsert = insertExpression != null
&& insertExpression.nodes.length == 1
&& updatableTableCheck == null;
}
/**
* Instantiate this as an INSERT_SELECT statement.
*/
StatementInsert(Session session, Table targetTable, int[] columnMap,
boolean[] checkColumns, QueryExpression queryExpression,
CompileContext compileContext, int override) {
super(StatementTypes.INSERT, StatementTypes.X_SQL_DATA_CHANGE,
session.getCurrentSchemaHsqlName());
this.targetTable = targetTable;
this.baseTable = targetTable.isTriggerInsertable() ? targetTable
: targetTable
.getBaseTable();
this.insertColumnMap = columnMap;
this.insertCheckColumns = checkColumns;
this.queryExpression = queryExpression;
this.overrideUserValue = override;
setupChecks();
setDatabseObjects(session, compileContext);
checkAccessRights(session);
}
/**
* Executes an INSERT_SELECT or INSERT_VALUESstatement. It is assumed that
* the argument is of the correct type.
*
* @return the result of executing the statement
*/
Result getResult(Session session) {
Result resultOut = null;
RowSetNavigator generatedNavigator = null;
PersistentStore store = baseTable.getRowStore(session);
int count;
if (generatedIndexes != null) {
resultOut = Result.newUpdateCountResult(generatedResultMetaData,
0);
generatedNavigator = resultOut.getChainedResult().getNavigator();
}
if (isSimpleInsert) {
Type[] colTypes = baseTable.getColumnTypes();
Object[] data = getInsertData(session, colTypes,
insertExpression.nodes[0].nodes);
return insertSingleRow(session, store, data);
}
RowSetNavigator newDataNavigator = queryExpression == null
? getInsertValuesNavigator(session)
: getInsertSelectNavigator(session);
count = newDataNavigator.getSize();
if (count > 0) {
insertRowSet(session, generatedNavigator, newDataNavigator);
}
if (baseTable.triggerLists[Trigger.INSERT_AFTER].length > 0) {
baseTable.fireTriggers(session, Trigger.INSERT_AFTER,
newDataNavigator);
}
if (resultOut == null) {
resultOut = new Result(ResultConstants.UPDATECOUNT, count);
} else {
resultOut.setUpdateCount(count);
}
if (count == 0) {
session.addWarning(HsqlException.noDataCondition);
}
return resultOut;
}
RowSetNavigator getInsertSelectNavigator(Session session) {
Type[] colTypes = baseTable.getColumnTypes();
int[] columnMap = insertColumnMap;
//
Result result = queryExpression.getResult(session, 0);
RowSetNavigator nav = result.initialiseNavigator();
Type[] sourceTypes = result.metaData.columnTypes;
RowSetNavigatorClient newData = new RowSetNavigatorClient(2);
while (nav.hasNext()) {
Object[] data = baseTable.getNewRowData(session);
Object[] sourceData = (Object[]) nav.getNext();
for (int i = 0; i < columnMap.length; i++) {
int j = columnMap[i];
if (j == this.overrideUserValue) {
continue;
}
Type sourceType = sourceTypes[i];
data[j] = colTypes[j].convertToType(session, sourceData[i],
sourceType);
}
newData.add(data);
}
return newData;
}
RowSetNavigator getInsertValuesNavigator(Session session) {
Type[] colTypes = baseTable.getColumnTypes();
//
Expression[] list = insertExpression.nodes;
RowSetNavigatorClient newData = new RowSetNavigatorClient(list.length);
for (int j = 0; j < list.length; j++) {
Expression[] rowArgs = list[j].nodes;
Object[] data = getInsertData(session, colTypes, rowArgs);
newData.add(data);
}
return newData;
}
}