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HSQLDB - Lightweight 100% Java SQL Database Engine
/* Copyright (c) 2001-2019, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb;
import org.hsqldb.HsqlNameManager.HsqlName;
import org.hsqldb.ParserDQL.CompileContext;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.lib.HashSet;
import org.hsqldb.lib.OrderedHashSet;
import org.hsqldb.map.ValuePool;
import org.hsqldb.result.Result;
import org.hsqldb.result.ResultMetaData;
import org.hsqldb.rights.Grantee;
import org.hsqldb.rights.Right;
/**
* Statement implementation for DML and base DQL statements.
*
* @author Campbell Burnet (campbell-burnet@users dot sourceforge.net)
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.4.1
* @since 1.7.2
*/
// fredt@users 20040404 - patch 1.7.2 - fixed type resolution for parameters
// campbell-burnet@users 200404xx - patch 1.7.2 - changed parameter naming scheme for SQLCI client usability/support
// fredt@users 20050609 - 1.8.0 - fixed EXPLAIN PLAN by implementing describe(Session)
// fredt@users - 1.9.0 - support for generated column reporting
// fredt@users - 1.9.0 - support for multi-row inserts
public abstract class StatementDMQL extends Statement {
/** target table for INSERT_XXX, UPDATE and DELETE and MERGE */
Table targetTable;
Table baseTable;
/** column map of query expression */
int[] baseColumnMap;
RangeVariable[] targetRangeVariables = RangeVariable.emptyArray;
/** source table for MERGE */
Table sourceTable;
/** condition expression for UPDATE, MERGE and DELETE */
Expression condition;
/** for TRUNCATE variation of DELETE */
boolean restartIdentity;
/** column map for INSERT operation direct or via MERGE */
int[] insertColumnMap = ValuePool.emptyIntArray;
/** column map for UPDATE operation direct or via MERGE */
int[] updateColumnMap = ValuePool.emptyIntArray;
int[] baseUpdateColumnMap = ValuePool.emptyIntArray;
/** Column value Expressions for UPDATE and MERGE. */
Expression[] updateExpressions = Expression.emptyArray;
/** Column value Expressions for MERGE */
Expression[][] multiColumnValues;
/** INSERT_VALUES */
Expression insertExpression;
/**
* Flags indicating which columns' values will/will not be
* explicitly set.
*/
boolean[] insertCheckColumns;
boolean[] updateCheckColumns;
/**
* VIEW check
*/
Expression updatableTableCheck;
RangeVariable checkRangeVariable;
/**
* Select to be evaluated when this is an INSERT_SELECT or
* SELECT statement
*/
QueryExpression queryExpression;
/**
* Name of cursor
*/
HsqlName cursorName;
/**
* Subqueries inverse usage depth order
*/
TableDerived[] subqueries = TableDerived.emptyArray;
/**
* Total number of RangeIterator objects used
*/
int rangeIteratorCount;
/**
* Database objects used
*/
NumberSequence[] sequences;
Routine[] routines;
RangeVariable[] rangeVariables;
StatementDMQL(int type, int group, HsqlName schemaName) {
super(type, group);
this.schemaName = schemaName;
this.isTransactionStatement = true;
}
void setBaseIndexColumnMap() {
if (targetTable != baseTable) {
baseColumnMap = targetTable.getBaseTableColumnMap();
}
}
public Result execute(Session session) {
Result result;
if (targetTable != null && session.isReadOnly()
&& !targetTable.isTemp()) {
HsqlException e = Error.error(ErrorCode.X_25006);
return Result.newErrorResult(e);
}
if (isExplain) {
return getExplainResult(session);
}
try {
if (subqueries.length > 0) {
materializeSubQueries(session);
}
result = getResult(session);
} catch (Throwable t) {
result = Result.newErrorResult(t);
result.getException().setStatementType(group, type);
} finally {
clearStructures(session);
}
return result;
}
private Result getExplainResult(Session session) {
Result result = Result.newSingleColumnStringResult("OPERATION",
describe(session));
OrderedHashSet set = getReferences();
result.navigator.add(new Object[]{ "Object References" });
for (int i = 0; i < set.size(); i++) {
HsqlName name = (HsqlName) set.get(i);
result.navigator.add(new Object[]{
name.getSchemaQualifiedStatementName() });
}
result.navigator.add(new Object[]{ "Read Locks" });
for (int i = 0; i < readTableNames.length; i++) {
HsqlName name = readTableNames[i];
result.navigator.add(new Object[]{
name.getSchemaQualifiedStatementName() });
}
result.navigator.add(new Object[]{ "WriteLocks" });
for (int i = 0; i < writeTableNames.length; i++) {
HsqlName name = writeTableNames[i];
result.navigator.add(new Object[]{
name.getSchemaQualifiedStatementName() });
}
return result;
}
abstract Result getResult(Session session);
abstract void collectTableNamesForRead(OrderedHashSet set);
abstract void collectTableNamesForWrite(OrderedHashSet set);
boolean[] getInsertOrUpdateColumnCheckList() {
switch (type) {
case StatementTypes.INSERT :
return insertCheckColumns;
case StatementTypes.UPDATE_WHERE :
return updateCheckColumns;
case StatementTypes.MERGE :
boolean[] check =
(boolean[]) ArrayUtil.duplicateArray(insertCheckColumns);
ArrayUtil.orBooleanArray(updateCheckColumns, check);
return check;
}
return null;
}
void materializeSubQueries(Session session) {
HashSet subqueryPopFlags = new HashSet();
for (int i = 0; i < subqueries.length; i++) {
TableDerived td = subqueries[i];
if (!subqueryPopFlags.add(td)) {
continue;
}
if (!td.isCorrelated()) {
td.materialise(session);
}
}
}
TableDerived[] getSubqueries(Session session) {
OrderedHashSet subQueries = null;
for (int i = 0; i < targetRangeVariables.length; i++) {
if (targetRangeVariables[i] == null) {
continue;
}
OrderedHashSet set = targetRangeVariables[i].getSubqueries();
subQueries = OrderedHashSet.addAll(subQueries, set);
}
for (int i = 0; i < updateExpressions.length; i++) {
subQueries = updateExpressions[i].collectAllSubqueries(subQueries);
}
if (insertExpression != null) {
subQueries = insertExpression.collectAllSubqueries(subQueries);
}
if (condition != null) {
subQueries = condition.collectAllSubqueries(subQueries);
}
if (queryExpression != null) {
OrderedHashSet set = queryExpression.getSubqueries();
subQueries = OrderedHashSet.addAll(subQueries, set);
}
if (updatableTableCheck != null) {
OrderedHashSet set = updatableTableCheck.getSubqueries();
subQueries = OrderedHashSet.addAll(subQueries, set);
}
if (subQueries == null || subQueries.size() == 0) {
return TableDerived.emptyArray;
}
TableDerived[] subQueryArray = new TableDerived[subQueries.size()];
subQueries.toArray(subQueryArray);
return subQueryArray;
}
void setDatabaseObjects(Session session, CompileContext compileContext) {
parameters = compileContext.getParameters();
setParameterMetaData();
subqueries = getSubqueries(session);
rangeIteratorCount = compileContext.getRangeVarCount();
rangeVariables = compileContext.getAllRangeVariables();
sequences = compileContext.getSequences();
routines = compileContext.getRoutines();
OrderedHashSet set = new OrderedHashSet();
collectTableNamesForWrite(set);
if (set.size() > 0) {
writeTableNames = new HsqlName[set.size()];
set.toArray(writeTableNames);
set.clear();
}
collectTableNamesForRead(set);
set.removeAll(writeTableNames);
if (set.size() > 0) {
readTableNames = new HsqlName[set.size()];
set.toArray(readTableNames);
}
if (readTableNames.length == 0 && writeTableNames.length == 0) {
if (type == StatementTypes.SELECT_CURSOR
|| type == StatementTypes.SELECT_SINGLE) {
isTransactionStatement = false;
}
}
references = compileContext.getSchemaObjectNames();
if (targetTable != null) {
references.add(targetTable.getName());
if (targetTable == baseTable) {
if (insertCheckColumns != null) {
targetTable.getColumnNames(insertCheckColumns, references);
}
if (updateCheckColumns != null) {
targetTable.getColumnNames(updateCheckColumns, references);
}
}
}
}
/**
* Determines if the authorizations are adequate
* to execute the compiled object. Completion requires the list of
* all database objects in a compiled statement.
*/
void checkAccessRights(Session session) {
if (targetTable != null && !targetTable.isTemp()) {
if (!session.isProcessingScript()) {
targetTable.checkDataReadOnly();
}
Grantee owner = targetTable.getOwner();
if (owner != null && owner.isSystem()) {
if (!session.getUser().isSystem()) {
throw Error.error(ErrorCode.X_42501,
targetTable.getName().name);
}
}
session.checkReadWrite();
}
if (session.isAdmin()) {
return;
}
for (int i = 0; i < sequences.length; i++) {
session.getGrantee().checkAccess(sequences[i]);
}
for (int i = 0; i < routines.length; i++) {
if (routines[i].isLibraryRoutine()) {
continue;
}
session.getGrantee().checkAccess(routines[i]);
}
for (int i = 0; i < rangeVariables.length; i++) {
RangeVariable range = rangeVariables[i];
if (range.isViewSubquery) {
continue;
}
if (range.rangeTable.getSchemaName()
== SqlInvariants.SYSTEM_SCHEMA_HSQLNAME) {
continue;
}
Right right = session.getGrantee().checkSelect(range.rangeTable,
range.usedColumns);
ExpressionLogical expr = right.getFilterExpression();
range.setFilterExpression(session, expr);
}
switch (type) {
case StatementTypes.CALL : {
break;
}
case StatementTypes.INSERT : {
session.getGrantee().checkInsert(targetTable,
insertCheckColumns);
break;
}
case StatementTypes.SELECT_CURSOR :
break;
case StatementTypes.DELETE_WHERE : {
session.getGrantee().checkDelete(targetTable);
break;
}
case StatementTypes.UPDATE_WHERE : {
session.getGrantee().checkUpdate(targetTable,
updateCheckColumns);
break;
}
case StatementTypes.MERGE : {
session.getGrantee().checkInsert(targetTable,
insertCheckColumns);
session.getGrantee().checkUpdate(targetTable,
updateCheckColumns);
break;
}
}
}
Result getWriteAccessResult(Session session) {
try {
if (targetTable != null && !targetTable.isTemp()) {
session.checkReadWrite();
}
} catch (HsqlException e) {
return Result.newErrorResult(e);
}
return null;
}
/**
* Returns the metadata, which is empty if the CompiledStatement does not
* generate a Result.
*/
public ResultMetaData getResultMetaData() {
switch (type) {
case StatementTypes.DELETE_WHERE :
case StatementTypes.INSERT :
case StatementTypes.UPDATE_WHERE :
case StatementTypes.MERGE :
return ResultMetaData.emptyResultMetaData;
default :
throw Error.runtimeError(ErrorCode.U_S0500, "StatementDMQL");
}
}
/** @todo 1.9.0 - build the metadata only once and reuse */
/**
* Returns the metadata for the placeholder parameters.
*/
public ResultMetaData getParametersMetaData() {
return parameterMetaData;
}
/**
* Retrieves a String representation of this object.
*/
public String describe(Session session) {
try {
return describeImpl(session);
} catch (Throwable e) {
e.printStackTrace();
return e.toString();
}
}
/**
* Provides the toString() implementation.
*/
String describeImpl(Session session) throws Exception {
StringBuilder sb = new StringBuilder();
int blanks = 0;
switch (type) {
case StatementTypes.SELECT_CURSOR : {
sb.append(queryExpression.describe(session, 0));
appendParams(sb).append('\n');
appendSubqueries(session, sb, 2);
return sb.toString();
}
case StatementTypes.INSERT : {
if (queryExpression == null) {
sb.append("INSERT VALUES");
sb.append('[').append('\n');
appendMultiColumns(sb, insertColumnMap).append('\n');
appendTable(sb).append('\n');
appendParams(sb).append('\n');
appendSubqueries(session, sb, 2).append(']');
return sb.toString();
} else {
sb.append("INSERT SELECT");
sb.append('[').append('\n');
appendColumns(sb, insertColumnMap).append('\n');
appendTable(sb).append('\n');
sb.append(queryExpression.describe(session,
blanks)).append('\n');
appendParams(sb).append('\n');
appendSubqueries(session, sb, 2).append(']');
return sb.toString();
}
}
case StatementTypes.UPDATE_WHERE : {
sb.append("UPDATE");
sb.append('[').append('\n');
appendColumns(sb, updateColumnMap).append('\n');
appendTable(sb).append('\n');
appendCondition(session, sb);
for (int i = 0; i < targetRangeVariables.length; i++) {
sb.append(targetRangeVariables[i].describe(session,
blanks)).append('\n');
}
appendParams(sb).append('\n');
appendSubqueries(session, sb, 2).append(']');
return sb.toString();
}
case StatementTypes.DELETE_WHERE : {
sb.append("DELETE");
sb.append('[').append('\n');
appendTable(sb).append('\n');
appendCondition(session, sb);
for (int i = 0; i < targetRangeVariables.length; i++) {
sb.append(targetRangeVariables[i].describe(session,
blanks)).append('\n');
}
appendParams(sb).append('\n');
appendSubqueries(session, sb, 2).append(']');
return sb.toString();
}
case StatementTypes.CALL : {
sb.append("CALL");
sb.append('[').append(']');
return sb.toString();
}
case StatementTypes.MERGE : {
sb.append("MERGE");
sb.append('[').append('\n');
appendMultiColumns(sb, insertColumnMap).append('\n');
appendColumns(sb, updateColumnMap).append('\n');
appendTable(sb).append('\n');
appendCondition(session, sb);
for (int i = 0; i < targetRangeVariables.length; i++) {
sb.append(targetRangeVariables[i].describe(session,
blanks)).append('\n');
}
appendParams(sb).append('\n');
appendSubqueries(session, sb, 2).append(']');
return sb.toString();
}
default : {
return "UNKNOWN";
}
}
}
private StringBuilder appendSubqueries(Session session, StringBuilder sb,
int blanks) {
sb.append("SUBQUERIES[");
for (int i = 0; i < subqueries.length; i++) {
sb.append("\n[level=").append(subqueries[i].depth).append('\n');
if (subqueries[i].queryExpression == null) {
for (int j = 0; j < blanks; j++) {
sb.append(' ');
}
sb.append("value expression");
} else {
sb.append(subqueries[i].queryExpression.describe(session,
blanks));
}
sb.append("]");
}
sb.append(']');
return sb;
}
private StringBuilder appendTable(StringBuilder sb) {
sb.append("TABLE[").append(targetTable.getName().name).append(']');
return sb;
}
private StringBuilder appendSourceTable(StringBuilder sb) {
sb.append("SOURCE TABLE[").append(sourceTable.getName().name).append(
']');
return sb;
}
private StringBuilder appendColumns(StringBuilder sb, int[] columnMap) {
if (columnMap == null || updateExpressions.length == 0) {
return sb;
}
sb.append("COLUMNS=[");
for (int i = 0; i < columnMap.length; i++) {
sb.append('\n').append(columnMap[i]).append(':').append(
' ').append(
targetTable.getColumn(columnMap[i]).getNameString());
}
for (int i = 0; i < updateExpressions.length; i++) {
sb.append('[').append(updateExpressions[i]).append(']');
}
sb.append(']');
return sb;
}
private StringBuilder appendMultiColumns(StringBuilder sb,
int[] columnMap) {
// todo - multiColVals is always null
if (columnMap == null || multiColumnValues == null) {
return sb;
}
sb.append("COLUMNS=[");
for (int j = 0; j < multiColumnValues.length; j++) {
for (int i = 0; i < columnMap.length; i++) {
sb.append('\n').append(columnMap[i]).append(':').append(
' ').append(
targetTable.getColumn(columnMap[i]).getName().name).append(
'[').append(multiColumnValues[j][i]).append(']');
}
}
sb.append(']');
return sb;
}
private StringBuilder appendParams(StringBuilder sb) {
sb.append("PARAMETERS=[");
for (int i = 0; i < parameters.length; i++) {
sb.append('\n').append('@').append(i).append('[').append(
parameters[i].describe(null, 0)).append(']');
}
sb.append(']');
return sb;
}
private StringBuilder appendCondition(Session session, StringBuilder sb) {
return condition == null ? sb.append("CONDITION[]\n")
: sb.append("CONDITION[").append(
condition.describe(session, 0)).append(
"]\n");
}
public void resolve(Session session) {}
public final boolean isCatalogLock(int model) {
return false;
}
public boolean isCatalogChange() {
return false;
}
public void clearStructures(Session session) {
session.sessionContext.clearStructures(this);
}
}