private void copyData() {
if (table.isTemporary()) {
throw DbException.getUnsupportedException("TEMP TABLE");
}
Database db = session.getDatabase();
String baseName = table.getName();
String tempName = db.getTempTableName(baseName, session);
Column[] columns = table.getColumns();
ArrayList<Column> newColumns = New.arrayList();
Table newTable = cloneTableStructure(columns, db, tempName, newColumns);
try {
// check if a view would become invalid
// (because the column to drop is referenced or so)
checkViews(table, newTable);
} catch (DbException e) {
execute("DROP TABLE " + newTable.getName(), true);
throw DbException.get(ErrorCode.VIEW_IS_INVALID_2, e, getSQL(), e.getMessage());
}
String tableName = table.getName();
ArrayList<TableView> views = table.getViews();
if (views != null) {
views = New.arrayList(views);
for (TableView view : views) {
table.removeView(view);
}
}
execute("DROP TABLE " + table.getSQL() + " IGNORE", true);
db.renameSchemaObject(session, newTable, tableName);
for (DbObject child : newTable.getChildren()) {
if (child instanceof Sequence) {
continue;
}
String name = child.getName();
if (name == null || child.getCreateSQL() == null) {
continue;
}
if (name.startsWith(tempName + "_")) {
name = name.substring(tempName.length() + 1);
SchemaObject so = (SchemaObject) child;
if (so instanceof Constraint) {
if (so.getSchema().findConstraint(session, name) != null) {
name = so.getSchema().getUniqueConstraintName(session, newTable);
}
} else if (so instanceof Index) {
if (so.getSchema().findIndex(session, name) != null) {
name = so.getSchema().getUniqueIndexName(session, newTable, name);
}
}
db.renameSchemaObject(session, so, name);
}
}
if (views != null) {
for (TableView view : views) {
String sql = view.getCreateSQL(true, true);
execute(sql, true);
}
}
}
/**
* Create a temporary view out of the given query.
*
* @param session the session
* @param owner the owner of the query
* @param name the view name
* @param query the query
* @param topQuery the top level query
* @return the view table
*/
public static TableView createTempView(
Session session, User owner, String name, Query query, Query topQuery) {
Schema mainSchema = session.getDatabase().getSchema(Constants.SCHEMA_MAIN);
String querySQL = query.getPlanSQL();
TableView v =
new TableView(mainSchema, 0, name, querySQL, query.getParameters(), null, session, false);
v.setTopQuery(topQuery);
if (v.createException != null) {
throw v.createException;
}
v.setOwner(owner);
v.setTemporary(true);
return v;
}
public double getCost(Session session, int[] masks) {
if (recursive) {
return 1000;
}
IntArray masksArray = new IntArray(masks == null ? Utils.EMPTY_INT_ARRAY : masks);
CostElement cachedCost = costCache.get(masksArray);
if (cachedCost != null) {
long time = System.currentTimeMillis();
if (time < cachedCost.evaluatedAt + Constants.VIEW_COST_CACHE_MAX_AGE) {
return cachedCost.cost;
}
}
Query q = (Query) session.prepare(querySQL, true);
if (masks != null) {
IntArray paramIndex = new IntArray();
for (int i = 0; i < masks.length; i++) {
int mask = masks[i];
if (mask == 0) {
continue;
}
paramIndex.add(i);
}
int len = paramIndex.size();
for (int i = 0; i < len; i++) {
int idx = paramIndex.get(i);
int mask = masks[idx];
int nextParamIndex = q.getParameters().size() + view.getParameterOffset();
if ((mask & IndexCondition.EQUALITY) != 0) {
Parameter param = new Parameter(nextParamIndex);
q.addGlobalCondition(param, idx, Comparison.EQUAL_NULL_SAFE);
} else {
if ((mask & IndexCondition.START) != 0) {
Parameter param = new Parameter(nextParamIndex);
q.addGlobalCondition(param, idx, Comparison.BIGGER_EQUAL);
}
if ((mask & IndexCondition.END) != 0) {
Parameter param = new Parameter(nextParamIndex);
q.addGlobalCondition(param, idx, Comparison.SMALLER_EQUAL);
}
}
}
String sql = q.getPlanSQL();
q = (Query) session.prepare(sql, true);
}
double cost = q.getCost();
cachedCost = new CostElement();
cachedCost.evaluatedAt = System.currentTimeMillis();
cachedCost.cost = cost;
costCache.put(masksArray, cachedCost);
return cost;
}
private Query getQuery(Session session, int[] masks) {
Query q = (Query) session.prepare(querySQL, true);
if (masks == null) {
return q;
}
int firstIndexParam = originalParameters == null ? 0 : originalParameters.size();
firstIndexParam += view.getParameterOffset();
IntArray paramIndex = new IntArray();
for (int i = 0; i < masks.length; i++) {
int mask = masks[i];
if (mask == 0) {
continue;
}
paramIndex.add(i);
if ((mask & IndexCondition.RANGE) == IndexCondition.RANGE) {
// two parameters for range queries: >= x AND <= y
paramIndex.add(i);
}
}
int len = paramIndex.size();
columns = new Column[len];
for (int i = 0; i < len; ) {
int idx = paramIndex.get(i);
Column col = table.getColumn(idx);
columns[i] = col;
int mask = masks[idx];
if ((mask & IndexCondition.EQUALITY) == IndexCondition.EQUALITY) {
Parameter param = new Parameter(firstIndexParam + i);
q.addGlobalCondition(param, idx, Comparison.EQUAL_NULL_SAFE);
i++;
} else {
if ((mask & IndexCondition.START) == IndexCondition.START) {
Parameter param = new Parameter(firstIndexParam + i);
q.addGlobalCondition(param, idx, Comparison.BIGGER_EQUAL);
i++;
}
if ((mask & IndexCondition.END) == IndexCondition.END) {
Parameter param = new Parameter(firstIndexParam + i);
q.addGlobalCondition(param, idx, Comparison.SMALLER_EQUAL);
i++;
}
}
}
String sql = q.getPlanSQL();
q = (Query) session.prepare(sql, true);
return q;
}
@Override
public int update() {
session.commit(true);
session.getUser().checkAdmin();
Database db = session.getDatabase();
TableView view = null;
Table old = getSchema().findTableOrView(session, viewName);
if (old != null) {
if (ifNotExists) {
return 0;
}
if (!orReplace || !Table.VIEW.equals(old.getTableType())) {
throw DbException.get(ErrorCode.VIEW_ALREADY_EXISTS_1, viewName);
}
view = (TableView) old;
}
int id = getObjectId();
String querySQL;
if (select == null) {
querySQL = selectSQL;
} else {
ArrayList<Parameter> params = select.getParameters();
if (params != null && params.size() > 0) {
throw DbException.getUnsupportedException("parameters in views");
}
querySQL = select.getPlanSQL();
}
// The view creates a Prepared command object, which belongs to a
// session, so we pass the system session down.
Session sysSession = db.getSystemSession();
synchronized (sysSession) {
try {
if (view == null) {
Schema schema = session.getDatabase().getSchema(session.getCurrentSchemaName());
sysSession.setCurrentSchema(schema);
Column[] columnTemplates = null;
if (columnNames != null) {
columnTemplates = new Column[columnNames.length];
for (int i = 0; i < columnNames.length; ++i) {
columnTemplates[i] = new Column(columnNames[i], Value.UNKNOWN);
}
}
view =
new TableView(
getSchema(), id, viewName, querySQL, null, columnTemplates, sysSession, false);
} else {
view.replace(querySQL, columnNames, sysSession, false, force);
view.setModified();
}
} finally {
sysSession.setCurrentSchema(db.getSchema(Constants.SCHEMA_MAIN));
}
}
if (comment != null) {
view.setComment(comment);
}
if (old == null) {
db.addSchemaObject(session, view);
} else {
db.updateMeta(session, view);
}
return 0;
}
public Cursor find(Session session, SearchRow first, SearchRow last) {
if (recursive) {
if (view.getRecursiveResult() != null) {
ResultInterface r = view.getRecursiveResult();
r.reset();
return new ViewCursor(table, r);
}
if (query == null) {
query = (Query) createSession.prepare(querySQL, true);
planSQL = query.getPlanSQL();
}
if (!(query instanceof SelectUnion)) {
throw DbException.get(ErrorCode.SYNTAX_ERROR_2, "recursive queries without UNION ALL");
}
SelectUnion union = (SelectUnion) query;
if (union.getUnionType() != SelectUnion.UNION_ALL) {
throw DbException.get(ErrorCode.SYNTAX_ERROR_2, "recursive queries without UNION ALL");
}
Query left = union.getLeft();
ResultInterface r = left.query(0);
LocalResult result = union.getEmptyResult();
while (r.next()) {
result.addRow(r.currentRow());
}
Query right = union.getRight();
r.reset();
view.setRecursiveResult(r);
while (true) {
r = right.query(0);
if (r.getRowCount() == 0) {
break;
}
while (r.next()) {
result.addRow(r.currentRow());
}
r.reset();
view.setRecursiveResult(r);
}
return new ViewCursor(table, result);
}
ArrayList<Parameter> paramList = query.getParameters();
for (int i = 0; originalParameters != null && i < originalParameters.size(); i++) {
Parameter orig = originalParameters.get(i);
int idx = orig.getIndex();
Value value = orig.getValue(session);
setParameter(paramList, idx, value);
}
int len;
if (first != null) {
len = first.getColumnCount();
} else if (last != null) {
len = last.getColumnCount();
} else {
len = 0;
}
int idx = originalParameters == null ? 0 : originalParameters.size();
idx += view.getParameterOffset();
for (int i = 0; i < len; i++) {
if (first != null) {
Value v = first.getValue(i);
if (v != null) {
int x = idx++;
setParameter(paramList, x, v);
}
}
// for equality, only one parameter is used (first == last)
if (last != null && indexMasks[i] != IndexCondition.EQUALITY) {
Value v = last.getValue(i);
if (v != null) {
int x = idx++;
setParameter(paramList, x, v);
}
}
}
ResultInterface result = query.query(0);
return new ViewCursor(table, result);
}
