/**
* Removes any foreign key Constraint objects (exported keys) held by any tables referenced by the
* specified table.
*
* <p>This method is called as the last step of a successful call to dropTable() in order to
* ensure that the dropped Table ceases to be referenced when enforcing referential integrity.
*
* @param toDrop The table to which other tables may be holding keys. This is typically a table
* that is in the process of being dropped.
*/
void removeExportedKeys(Table toDrop) {
for (int i = 0; i < tTable.size(); i++) {
HsqlArrayList constraintvector = ((Table) tTable.get(i)).getConstraints();
for (int j = constraintvector.size() - 1; j >= 0; j--) {
Constraint currentConstraint = (Constraint) constraintvector.get(j);
Table refTable = currentConstraint.getRef();
if (toDrop == refTable) {
constraintvector.remove(j);
}
}
}
}
Constraint duplicate() {
Constraint localConstraint = new Constraint();
localConstraint.core = this.core.duplicate();
localConstraint.name = this.name;
localConstraint.constType = this.constType;
localConstraint.isForward = this.isForward;
localConstraint.check = this.check;
localConstraint.isNotNull = this.isNotNull;
localConstraint.notNullColumnIndex = this.notNullColumnIndex;
localConstraint.rangeVariable = this.rangeVariable;
return localConstraint;
}
Constraint duplicate() {
Constraint copy = new Constraint();
copy.core = core.duplicate();
copy.name = name;
copy.constType = constType;
copy.isForward = isForward;
//
copy.check = check;
copy.isNotNull = isNotNull;
copy.notNullColumnIndex = notNullColumnIndex;
copy.rangeVariable = rangeVariable;
copy.schemaObjectNames = schemaObjectNames;
return copy;
}
/** Throws if the table is referenced in a foreign key constraint. */
private void checkTableIsReferenced(Table toDrop) throws HsqlException {
Constraint[] constraints = toDrop.getConstraints();
Constraint currentConstraint = null;
Table refTable = null;
boolean isRef = false;
boolean isSelfRef = false;
int refererIndex = -1;
for (int i = 0; i < constraints.length; i++) {
currentConstraint = constraints[i];
if (currentConstraint.getType() != Constraint.MAIN) {
continue;
}
refTable = currentConstraint.getRef();
isRef = (refTable != null);
isSelfRef = (isRef && toDrop.equals(refTable));
if (isRef && !isSelfRef) {
// cover the case where the referencing table
// may have already been dropped
for (int k = 0; k < tTable.size(); k++) {
if (refTable.equals(tTable.get(k))) {
refererIndex = k;
break;
}
}
if (refererIndex != -1) {
throw Trace.error(
Trace.TABLE_REFERENCED_CONSTRAINT,
Trace.Database_dropTable,
new Object[] {currentConstraint.getName().name, refTable.getName().name});
}
}
}
}
/**
* Drops the specified user-defined view or table from this Database object.
*
* <p>The process of dropping a table or view includes:
*
* <OL>
* <LI>checking that the specified Session's currently connected User has the right to perform
* this operation and refusing to proceed if not by throwing.
* <LI>checking for referential constraints that conflict with this operation and refusing to
* proceed if they exist by throwing.
* <LI>removing the specified Table from this Database object.
* <LI>removing any exported foreign keys Constraint objects held by any tables referenced by
* the table to be dropped. This is especially important so that the dropped Table ceases to
* be referenced, eventually allowing its full garbage collection.
* <LI>
* </OL>
*
* <p>
*
* @param name of the table or view to drop
* @param ifExists if true and if the Table to drop does not exist, fail silently, else throw
* @param isView true if the name argument refers to a View
* @param session the connected context in which to perform this operation
* @throws SQLException if any of the checks listed above fail
*/
void dropTable(String name, boolean ifExists, boolean isView, Session session)
throws SQLException {
Table toDrop = null;
int dropIndex = -1;
int refererIndex = -1;
Enumeration constraints = null;
Constraint currentConstraint = null;
Table refTable = null;
boolean isRef = false;
boolean isSelfRef = false;
for (int i = 0; i < tTable.size(); i++) {
toDrop = (Table) tTable.get(i);
if (toDrop.equals(name, session) && isView == toDrop.isView()) {
dropIndex = i;
break;
} else {
toDrop = null;
}
}
if (dropIndex == -1) {
if (ifExists) {
return;
} else {
throw Trace.error(isView ? Trace.VIEW_NOT_FOUND : Trace.TABLE_NOT_FOUND, name);
}
}
constraints = toDrop.getConstraints().elements();
while (constraints.hasMoreElements()) {
currentConstraint = (Constraint) constraints.nextElement();
if (currentConstraint.getType() != Constraint.MAIN) {
continue;
}
refTable = currentConstraint.getRef();
isRef = (refTable != null);
isSelfRef = (isRef && toDrop.equals(refTable));
if (isRef && !isSelfRef) {
// cover the case where the referencing table
// may have already been dropped
for (int k = 0; k < tTable.size(); k++) {
if (refTable.equals(tTable.get(k))) {
refererIndex = k;
break;
}
}
if (refererIndex != -1) {
// tony_lai@users 20020820 - patch 595156
throw Trace.error(
Trace.INTEGRITY_CONSTRAINT_VIOLATION,
currentConstraint.getName().name + " table: " + refTable.getName().name);
}
}
}
tTable.remove(dropIndex);
removeExportedKeys(toDrop);
aAccess.removeDbObject(toDrop.getName());
triggerNameList.removeOwner(toDrop.tableName);
indexNameList.removeOwner(toDrop.tableName);
toDrop.drop();
session.setScripting(!toDrop.isTemp());
session.commit();
}
Result getResult(Session paramSession) {
HsqlNameManager.HsqlName localHsqlName1 = this.statements[0].getSchemaName();
if (this.isExplain)
return Result.newSingleColumnStringResult("OPERATION", describe(paramSession));
Result localResult = this.statements[0].execute(paramSession);
HsqlArrayList localHsqlArrayList = new HsqlArrayList();
StatementSchema localStatementSchema2 = new StatementSchema(null, 1199);
if ((this.statements.length == 1) || (localResult.isError())) return localResult;
HsqlNameManager.HsqlName localHsqlName2 = paramSession.getCurrentSchemaHsqlName();
Table localTable;
for (int i = 1; i < this.statements.length; i++) {
try {
paramSession.setSchema(localHsqlName1.name);
} catch (HsqlException localHsqlException3) {
}
this.statements[i].setSchemaHsqlName(localHsqlName1);
paramSession.parser.reset(this.statements[i].getSQL());
try {
paramSession.parser.read();
StatementSchema localStatementSchema1;
switch (this.statements[i].getType()) {
case 48:
case 49:
localResult = this.statements[i].execute(paramSession);
break;
case 77:
localStatementSchema1 = paramSession.parser.compileCreate();
localStatementSchema1.isSchemaDefinition = true;
localStatementSchema1.setSchemaHsqlName(localHsqlName1);
if (paramSession.parser.token.tokenType != 848)
throw paramSession.parser.unexpectedToken();
localStatementSchema1.isLogged = false;
localResult = localStatementSchema1.execute(paramSession);
HsqlNameManager.HsqlName localHsqlName3 =
((Table) localStatementSchema1.arguments[0]).getName();
localTable =
(Table) paramSession.database.schemaManager.getSchemaObject(localHsqlName3);
localHsqlArrayList.addAll((HsqlArrayList) localStatementSchema1.arguments[1]);
((HsqlArrayList) localStatementSchema1.arguments[1]).clear();
localStatementSchema2.sql = localTable.getSQL();
localStatementSchema2.execute(paramSession);
break;
case 8:
case 10:
case 61:
case 83:
case 133:
localResult = this.statements[i].execute(paramSession);
break;
case 14:
case 23:
case 80:
case 84:
case 1073:
localStatementSchema1 = paramSession.parser.compileCreate();
localStatementSchema1.isSchemaDefinition = true;
localStatementSchema1.setSchemaHsqlName(localHsqlName1);
if (paramSession.parser.token.tokenType != 848)
throw paramSession.parser.unexpectedToken();
localResult = localStatementSchema1.execute(paramSession);
break;
case 6:
case 52:
case 79:
case 114:
case 117:
throw paramSession.parser.unsupportedFeature();
default:
throw Error.runtimeError(201, "");
}
if (localResult.isError()) break;
} catch (HsqlException localHsqlException4) {
localResult = Result.newErrorResult(localHsqlException4, this.statements[i].getSQL());
break;
}
}
if (!localResult.isError())
try {
for (i = 0; i < localHsqlArrayList.size(); i++) {
Constraint localConstraint = (Constraint) localHsqlArrayList.get(i);
localTable =
paramSession.database.schemaManager.getUserTable(
paramSession, localConstraint.core.refTableName);
ParserDDL.addForeignKey(paramSession, localTable, localConstraint, null);
localStatementSchema2.sql = localConstraint.getSQL();
localStatementSchema2.execute(paramSession);
}
} catch (HsqlException localHsqlException1) {
localResult = Result.newErrorResult(localHsqlException1, this.sql);
}
if (localResult.isError())
try {
paramSession.database.schemaManager.dropSchema(paramSession, localHsqlName1.name, true);
paramSession.database.logger.writeOtherStatement(
paramSession, getDropSchemaStatement(localHsqlName1));
} catch (HsqlException localHsqlException2) {
}
paramSession.setCurrentSchemaHsqlName(localHsqlName2);
return localResult;
}