public void rename(String newName) {
super.rename(newName);
if (constraints != null) {
for (int i = 0, size = constraints.size(); i < size; i++) {
Constraint constraint = constraints.get(i);
constraint.rebuild();
}
}
}
/**
* Enable or disable foreign key constraint checking for this table.
*
* @param session the session
* @param enabled true if checking should be enabled
* @param checkExisting true if existing rows must be checked during this call
*/
public void setCheckForeignKeyConstraints(
Session session, boolean enabled, boolean checkExisting) {
if (enabled && checkExisting) {
if (constraints != null) {
for (Constraint c : constraints) {
c.checkExistingData(session);
}
}
}
checkForeignKeyConstraints = enabled;
}
private void fireConstraints(Session session, Row oldRow, Row newRow, boolean before) {
if (constraints != null) {
// don't use enhanced for loop to avoid creating objects
for (int i = 0, size = constraints.size(); i < size; i++) {
Constraint constraint = constraints.get(i);
if (constraint.isBefore() == before) {
constraint.checkRow(session, this, oldRow, newRow);
}
}
}
}
/**
* If the index is still required by a constraint, transfer the ownership to it. Otherwise, the
* index is removed.
*
* @param session the session
* @param index the index that is no longer required
*/
public void removeIndexOrTransferOwnership(Session session, Index index) {
boolean stillNeeded = false;
if (constraints != null) {
for (Constraint cons : constraints) {
if (cons.usesIndex(index)) {
cons.setIndexOwner(index);
database.update(session, cons);
stillNeeded = true;
}
}
}
if (!stillNeeded) {
database.removeSchemaObject(session, index);
}
}
@Override
public int compareTo(Constraint other) {
if (this == other) {
return 0;
}
int thisType = getConstraintTypeOrder();
int otherType = other.getConstraintTypeOrder();
return thisType - otherType;
}
/**
* Check that this column is not referenced by a multi-column constraint or multi-column index. If
* it is, an exception is thrown. Single-column references and indexes are dropped.
*
* @param session the session
* @param col the column
* @throws DbException if the column is referenced by multi-column constraints or indexes
*/
public void dropSingleColumnConstraintsAndIndexes(Session session, Column col) {
ArrayList<Constraint> constraintsToDrop = New.arrayList();
if (constraints != null) {
for (int i = 0, size = constraints.size(); i < size; i++) {
Constraint constraint = constraints.get(i);
HashSet<Column> columns = constraint.getReferencedColumns(this);
if (!columns.contains(col)) {
continue;
}
if (columns.size() == 1) {
constraintsToDrop.add(constraint);
} else {
throw DbException.get(ErrorCode.COLUMN_IS_REFERENCED_1, constraint.getSQL());
}
}
}
ArrayList<Index> indexesToDrop = New.arrayList();
ArrayList<Index> indexes = getIndexes();
if (indexes != null) {
for (int i = 0, size = indexes.size(); i < size; i++) {
Index index = indexes.get(i);
if (index.getCreateSQL() == null) {
continue;
}
if (index.getColumnIndex(col) < 0) {
continue;
}
if (index.getColumns().length == 1) {
indexesToDrop.add(index);
} else {
throw DbException.get(ErrorCode.COLUMN_IS_REFERENCED_1, index.getSQL());
}
}
}
for (Constraint c : constraintsToDrop) {
session.getDatabase().removeSchemaObject(session, c);
}
for (Index i : indexesToDrop) {
// the index may already have been dropped when dropping the constraint
if (getIndexes().contains(i)) {
session.getDatabase().removeSchemaObject(session, i);
}
}
}
/**
* Add all objects that this table depends on to the hash set.
*
* @param dependencies the current set of dependencies
*/
public void addDependencies(HashSet<DbObject> dependencies) {
if (dependencies.contains(this)) {
// avoid endless recursion
return;
}
if (sequences != null) {
for (Sequence s : sequences) {
dependencies.add(s);
}
}
ExpressionVisitor visitor = ExpressionVisitor.getDependenciesVisitor(dependencies);
if (columns != null)
for (Column col : columns) {
col.isEverything(visitor);
}
if (constraints != null) {
for (Constraint c : constraints) {
c.isEverything(visitor);
}
}
dependencies.add(this);
}
@Override
public ResultInterface query(int maxrows) {
session.getUser().checkAdmin();
reset();
Database db = session.getDatabase();
if (schemaNames != null) {
for (String schemaName : schemaNames) {
Schema schema = db.findSchema(schemaName);
if (schema == null) {
throw DbException.get(ErrorCode.SCHEMA_NOT_FOUND_1, schemaName);
}
}
}
try {
result = createResult();
deleteStore();
openOutput();
if (out != null) {
buffer = new byte[Constants.IO_BUFFER_SIZE];
}
if (settings) {
for (Setting setting : db.getAllSettings()) {
if (setting.getName().equals(SetTypes.getTypeName(SetTypes.CREATE_BUILD))) {
// don't add CREATE_BUILD to the script
// (it is only set when creating the database)
continue;
}
add(setting.getCreateSQL(), false);
}
}
if (out != null) {
add("", true);
}
for (User user : db.getAllUsers()) {
add(user.getCreateSQL(passwords), false);
}
for (Role role : db.getAllRoles()) {
add(role.getCreateSQL(true), false);
}
for (Schema schema : db.getAllSchemas()) {
if (excludeSchema(schema)) {
continue;
}
add(schema.getCreateSQL(), false);
}
for (UserDataType datatype : db.getAllUserDataTypes()) {
if (drop) {
add(datatype.getDropSQL(), false);
}
add(datatype.getCreateSQL(), false);
}
for (SchemaObject obj : db.getAllSchemaObjects(DbObject.CONSTANT)) {
if (excludeSchema(obj.getSchema())) {
continue;
}
Constant constant = (Constant) obj;
add(constant.getCreateSQL(), false);
}
final ArrayList<Table> tables = db.getAllTablesAndViews(false);
// sort by id, so that views are after tables and views on views
// after the base views
Collections.sort(
tables,
new Comparator<Table>() {
@Override
public int compare(Table t1, Table t2) {
return t1.getId() - t2.getId();
}
});
// Generate the DROP XXX ... IF EXISTS
for (Table table : tables) {
if (excludeSchema(table.getSchema())) {
continue;
}
if (excludeTable(table)) {
continue;
}
if (table.isHidden()) {
continue;
}
table.lock(session, false, false);
String sql = table.getCreateSQL();
if (sql == null) {
// null for metadata tables
continue;
}
if (drop) {
add(table.getDropSQL(), false);
}
}
for (SchemaObject obj : db.getAllSchemaObjects(DbObject.FUNCTION_ALIAS)) {
if (excludeSchema(obj.getSchema())) {
continue;
}
if (drop) {
add(obj.getDropSQL(), false);
}
add(obj.getCreateSQL(), false);
}
for (UserAggregate agg : db.getAllAggregates()) {
if (drop) {
add(agg.getDropSQL(), false);
}
add(agg.getCreateSQL(), false);
}
for (SchemaObject obj : db.getAllSchemaObjects(DbObject.SEQUENCE)) {
if (excludeSchema(obj.getSchema())) {
continue;
}
Sequence sequence = (Sequence) obj;
if (drop) {
add(sequence.getDropSQL(), false);
}
add(sequence.getCreateSQL(), false);
}
// Generate CREATE TABLE and INSERT...VALUES
int count = 0;
for (Table table : tables) {
if (excludeSchema(table.getSchema())) {
continue;
}
if (excludeTable(table)) {
continue;
}
if (table.isHidden()) {
continue;
}
table.lock(session, false, false);
String createTableSql = table.getCreateSQL();
if (createTableSql == null) {
// null for metadata tables
continue;
}
final String tableType = table.getTableType();
add(createTableSql, false);
final ArrayList<Constraint> constraints = table.getConstraints();
if (constraints != null) {
for (Constraint constraint : constraints) {
if (Constraint.PRIMARY_KEY.equals(constraint.getConstraintType())) {
add(constraint.getCreateSQLWithoutIndexes(), false);
}
}
}
if (Table.TABLE.equals(tableType)) {
if (table.canGetRowCount()) {
String rowcount =
"-- "
+ table.getRowCountApproximation()
+ " +/- SELECT COUNT(*) FROM "
+ table.getSQL();
add(rowcount, false);
}
if (data) {
count = generateInsertValues(count, table);
}
}
final ArrayList<Index> indexes = table.getIndexes();
for (int j = 0; indexes != null && j < indexes.size(); j++) {
Index index = indexes.get(j);
if (!index.getIndexType().getBelongsToConstraint()) {
add(index.getCreateSQL(), false);
}
}
}
if (tempLobTableCreated) {
add("DROP TABLE IF EXISTS SYSTEM_LOB_STREAM", true);
add("CALL SYSTEM_COMBINE_BLOB(-1)", true);
add("DROP ALIAS IF EXISTS SYSTEM_COMBINE_CLOB", true);
add("DROP ALIAS IF EXISTS SYSTEM_COMBINE_BLOB", true);
tempLobTableCreated = false;
}
// Generate CREATE CONSTRAINT ...
final ArrayList<SchemaObject> constraints = db.getAllSchemaObjects(DbObject.CONSTRAINT);
Collections.sort(
constraints,
new Comparator<SchemaObject>() {
@Override
public int compare(SchemaObject c1, SchemaObject c2) {
return ((Constraint) c1).compareTo((Constraint) c2);
}
});
for (SchemaObject obj : constraints) {
if (excludeSchema(obj.getSchema())) {
continue;
}
Constraint constraint = (Constraint) obj;
if (excludeTable(constraint.getTable())) {
continue;
}
if (constraint.getTable().isHidden()) {
continue;
}
if (!Constraint.PRIMARY_KEY.equals(constraint.getConstraintType())) {
add(constraint.getCreateSQLWithoutIndexes(), false);
}
}
// Generate CREATE TRIGGER ...
for (SchemaObject obj : db.getAllSchemaObjects(DbObject.TRIGGER)) {
if (excludeSchema(obj.getSchema())) {
continue;
}
TriggerObject trigger = (TriggerObject) obj;
if (excludeTable(trigger.getTable())) {
continue;
}
add(trigger.getCreateSQL(), false);
}
// Generate GRANT ...
for (Right right : db.getAllRights()) {
Table table = right.getGrantedTable();
if (table != null) {
if (excludeSchema(table.getSchema())) {
continue;
}
if (excludeTable(table)) {
continue;
}
}
add(right.getCreateSQL(), false);
}
// Generate COMMENT ON ...
for (Comment comment : db.getAllComments()) {
add(comment.getCreateSQL(), false);
}
if (out != null) {
out.close();
}
} catch (IOException e) {
throw DbException.convertIOException(e, getFileName());
} finally {
closeIO();
}
result.done();
LocalResult r = result;
reset();
return r;
}
/**
* Try to execute the statement.
*
* @return the update count
*/
private int tryUpdate() {
if (!transactional) {
session.commit(true);
}
Database db = session.getDatabase();
Table table = getSchema().getTableOrView(session, tableName);
if (getSchema().findConstraint(session, constraintName) != null) {
if (ifNotExists) {
return 0;
}
throw DbException.get(ErrorCode.CONSTRAINT_ALREADY_EXISTS_1, constraintName);
}
session.getUser().checkRight(table, Right.ALL);
db.lockMeta(session);
table.lock(session, true, true);
Constraint constraint;
switch (type) {
case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_PRIMARY_KEY:
{
IndexColumn.mapColumns(indexColumns, table);
index = table.findPrimaryKey();
ArrayList<Constraint> constraints = table.getConstraints();
for (int i = 0; constraints != null && i < constraints.size(); i++) {
Constraint c = constraints.get(i);
if (Constraint.PRIMARY_KEY.equals(c.getConstraintType())) {
throw DbException.get(ErrorCode.SECOND_PRIMARY_KEY);
}
}
if (index != null) {
// if there is an index, it must match with the one declared
// we don't test ascending / descending
IndexColumn[] pkCols = index.getIndexColumns();
if (pkCols.length != indexColumns.length) {
throw DbException.get(ErrorCode.SECOND_PRIMARY_KEY);
}
for (int i = 0; i < pkCols.length; i++) {
if (pkCols[i].column != indexColumns[i].column) {
throw DbException.get(ErrorCode.SECOND_PRIMARY_KEY);
}
}
}
if (index == null) {
IndexType indexType =
IndexType.createPrimaryKey(table.isPersistIndexes(), primaryKeyHash);
String indexName =
table.getSchema().getUniqueIndexName(session, table, Constants.PREFIX_PRIMARY_KEY);
int id = getObjectId();
try {
index = table.addIndex(session, indexName, id, indexColumns, indexType, true, null);
} finally {
getSchema().freeUniqueName(indexName);
}
}
index.getIndexType().setBelongsToConstraint(true);
int constraintId = getObjectId();
String name = generateConstraintName(table);
ConstraintUnique pk = new ConstraintUnique(getSchema(), constraintId, name, table, true);
pk.setColumns(indexColumns);
pk.setIndex(index, true);
constraint = pk;
break;
}
case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_UNIQUE:
{
IndexColumn.mapColumns(indexColumns, table);
boolean isOwner = false;
if (index != null && canUseUniqueIndex(index, table, indexColumns)) {
isOwner = true;
index.getIndexType().setBelongsToConstraint(true);
} else {
index = getUniqueIndex(table, indexColumns);
if (index == null) {
index = createIndex(table, indexColumns, true);
isOwner = true;
}
}
int id = getObjectId();
String name = generateConstraintName(table);
ConstraintUnique unique = new ConstraintUnique(getSchema(), id, name, table, false);
unique.setColumns(indexColumns);
unique.setIndex(index, isOwner);
constraint = unique;
break;
}
case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_CHECK:
{
int id = getObjectId();
String name = generateConstraintName(table);
ConstraintCheck check = new ConstraintCheck(getSchema(), id, name, table);
TableFilter filter = new TableFilter(session, table, null, false, null);
checkExpression.mapColumns(filter, 0);
checkExpression = checkExpression.optimize(session);
check.setExpression(checkExpression);
check.setTableFilter(filter);
constraint = check;
if (checkExisting) {
check.checkExistingData(session);
}
break;
}
case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_REFERENTIAL:
{
Table refTable = refSchema.getTableOrView(session, refTableName);
session.getUser().checkRight(refTable, Right.ALL);
if (!refTable.canReference()) {
throw DbException.get(
ErrorCode.FEATURE_NOT_SUPPORTED_1, "Reference " + refTable.getSQL());
}
boolean isOwner = false;
IndexColumn.mapColumns(indexColumns, table);
if (index != null && canUseIndex(index, table, indexColumns)) {
isOwner = true;
index.getIndexType().setBelongsToConstraint(true);
} else {
index = getIndex(table, indexColumns);
if (index == null) {
index = createIndex(table, indexColumns, false);
isOwner = true;
}
}
if (refIndexColumns == null) {
Index refIdx = refTable.getPrimaryKey();
refIndexColumns = refIdx.getIndexColumns();
} else {
IndexColumn.mapColumns(refIndexColumns, refTable);
}
if (refIndexColumns.length != indexColumns.length) {
throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
}
boolean isRefOwner = false;
if (refIndex != null
&& refIndex.getTable() == refTable
&& canUseIndex(refIndex, refTable, refIndexColumns)) {
isRefOwner = true;
refIndex.getIndexType().setBelongsToConstraint(true);
} else {
refIndex = null;
}
if (refIndex == null) {
refIndex = getIndex(refTable, refIndexColumns);
if (refIndex == null) {
refIndex = createIndex(refTable, refIndexColumns, true);
isRefOwner = true;
}
}
int id = getObjectId();
String name = generateConstraintName(table);
ConstraintReferential ref = new ConstraintReferential(getSchema(), id, name, table);
ref.setColumns(indexColumns);
ref.setIndex(index, isOwner);
ref.setRefTable(refTable);
ref.setRefColumns(refIndexColumns);
ref.setRefIndex(refIndex, isRefOwner);
if (checkExisting) {
ref.checkExistingData(session);
}
constraint = ref;
refTable.addConstraint(constraint);
ref.setDeleteAction(deleteAction);
ref.setUpdateAction(updateAction);
break;
}
default:
throw DbException.throwInternalError("type=" + type);
}
// parent relationship is already set with addConstraint
constraint.setComment(comment);
if (table.isTemporary() && !table.isGlobalTemporary()) {
session.addLocalTempTableConstraint(constraint);
} else {
db.addSchemaObject(session, constraint);
}
table.addConstraint(constraint);
return 0;
}
