/**
* 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 HsqlException if any of the checks listed above fail
*/
void dropTable(Session session, String name, boolean ifExists, boolean isView)
throws HsqlException {
Table toDrop = null;
int dropIndex = -1;
for (int i = 0; i < tTable.size(); i++) {
toDrop = (Table) tTable.get(i);
if (toDrop.equals(session, name) && 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);
}
}
if (!toDrop.isTemp()) {
session.checkDDLWrite();
}
if (isView) {
checkViewIsInView((View) toDrop);
} else {
checkTableIsReferenced(toDrop);
checkTableIsInView(toDrop.tableName.name);
}
tTable.remove(dropIndex);
removeExportedKeys(toDrop);
userManager.removeDbObject(toDrop.getName());
triggerNameList.removeOwner(toDrop.tableName);
indexNameList.removeOwner(toDrop.tableName);
constraintNameList.removeOwner(toDrop.tableName);
toDrop.dropTriggers();
toDrop.drop();
session.setScripting(!toDrop.isTemp());
session.commit();
}
/** Returns an array of views that reference a sequence. */
View[] getViewsWithSequence(NumberSequence sequence) {
HsqlArrayList list = null;
for (int i = 0; i < tTable.size(); i++) {
Table t = (Table) tTable.get(i);
if (t.isView()) {
boolean found = ((View) t).hasSequence(sequence);
if (found) {
if (list == null) {
list = new HsqlArrayList();
}
list.add(t);
}
}
}
return list == null ? null : (View[]) list.toArray(new View[list.size()]);
}
/**
* Returns an array of views that reference the specified table or the specified column if column
* parameter is not null.
*/
private View[] getViewsWithTable(String table, String column) {
HsqlArrayList list = null;
for (int i = 0; i < tTable.size(); i++) {
Table t = (Table) tTable.get(i);
if (t.isView()) {
boolean found =
column == null ? ((View) t).hasTable(table) : ((View) t).hasColumn(table, column);
if (found) {
if (list == null) {
list = new HsqlArrayList();
}
list.add(t);
}
}
}
return list == null ? null : (View[]) list.toArray(new View[list.size()]);
}
void moveConditionsToInner(Session session, RangeVariable[] ranges) {
Expression[] colExpr;
int exclude;
HsqlArrayList conditionsList;
Expression condition = null;
if (whereConditions.length > 1) {
return;
}
if (joinConditions.length > 1) {
return;
}
for (int i = 0; i < ranges.length; i++) {
if (ranges[i].isLeftJoin || ranges[i].isRightJoin) {
return;
}
}
exclude = ArrayUtil.find(ranges, this);
conditionsList = new HsqlArrayList();
addConditionsToList(conditionsList, joinConditions[0].indexCond);
if (joinConditions[0].indexCond != null
&& joinConditions[0].indexCond[0] != joinConditions[0].indexEndCond[0]) {
addConditionsToList(conditionsList, joinConditions[0].indexEndCond);
}
addConditionsToList(conditionsList, whereConditions[0].indexCond);
addConditionsToList(conditionsList, whereConditions[0].indexEndCond);
RangeVariableResolver.decomposeAndConditions(
session, joinConditions[0].nonIndexCondition, conditionsList);
RangeVariableResolver.decomposeAndConditions(
session, whereConditions[0].nonIndexCondition, conditionsList);
for (int i = conditionsList.size() - 1; i >= 0; i--) {
Expression e = (Expression) conditionsList.get(i);
if (e == null || e.isTrue() || e.hasReference(ranges, exclude)) {
conditionsList.remove(i);
continue;
}
}
if (conditionsList.size() == 0) {
if (rangeTable.isView()) {
((TableDerived) rangeTable).resetToView();
}
return;
}
QueryExpression queryExpression = rangeTable.getQueryExpression();
colExpr = ((QuerySpecification) queryExpression).exprColumns;
for (int i = 0; i < conditionsList.size(); i++) {
Expression e = (Expression) conditionsList.get(i);
OrderedHashSet set = e.collectRangeVariables(null);
e = e.duplicate();
e = e.replaceColumnReferences(this, colExpr);
if (e.collectAllSubqueries(null) != null) {
return;
}
if (set != null) {
for (int j = 0; j < set.size(); j++) {
RangeVariable range = (RangeVariable) set.get(j);
if (this != range && range.rangeType == RangeVariable.TABLE_RANGE) {
queryExpression.setCorrelated();
}
}
}
condition = ExpressionLogical.andExpressions(condition, e);
}
queryExpression.addExtraConditions(condition);
}
/**
* Method declaration
*
* @param db
* @param file
* @param full
* @param session
* @throws SQLException
*/
static void scriptToFile(Database db, String file, boolean full, Session session)
throws SQLException {
if ((new File(file)).exists()) {
// there must be no such file; overwriting not allowed for security
throw Trace.error(Trace.FILE_IO_ERROR, file);
}
try {
long time = 0;
if (Trace.TRACE) {
time = System.currentTimeMillis();
}
// only ddl commands; needs not so much memory
Result r;
if (full) {
// no drop, no insert, and no positions for cached tables
r = db.getScript(false, false, false, session);
} else {
// no drop, no insert, but positions for cached tables
r = db.getScript(false, false, true, session);
}
Record n = r.rRoot;
FileWriter w = new FileWriter(file);
while (n != null) {
writeLine(w, (String) n.data[0]);
n = n.next;
}
// inserts are done separetely to save memory
HsqlArrayList tables = db.getTables();
for (int i = 0; i < tables.size(); i++) {
Table t = (Table) tables.get(i);
// cached tables have the index roots set in the ddl script
if ((full || !t.isCached())
&& !t.isTemp()
&& !t.isView()
&& (!t.isText() || !t.isDataReadOnly())) {
Index primary = t.getPrimaryIndex();
Node x = primary.first();
while (x != null) {
writeLine(w, t.getInsertStatement(x.getData()));
x = primary.next(x);
}
}
// fredt@users 20020221 - patch 513005 by sqlbob@users (RMP)
if (t.isDataReadOnly() && !t.isTemp() && !t.isText()) {
HsqlStringBuffer a = new HsqlStringBuffer("SET TABLE ");
a.append(t.getName().statementName);
a.append(" READONLY TRUE");
writeLine(w, a.toString());
}
}
w.close();
if (Trace.TRACE) {
Trace.trace(time - System.currentTimeMillis());
}
} catch (IOException e) {
throw Trace.error(Trace.FILE_IO_ERROR, file + " " + e);
}
}
/**
* 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();
}
