/**
* Try to find a constraint with this name. This method returns null if no object with this name
* exists.
*
* @param session the session
* @param name the object name
* @return the object or null
*/
public Constraint findConstraint(ServerSession session, String name) {
Constraint constraint = constraints.get(name);
if (constraint == null) {
constraint = session.findLocalTempTableConstraint(name);
}
return constraint;
}
/**
* Try to find an index with this name. This method returns null if no object with this name
* exists.
*
* @param session the session
* @param name the object name
* @return the object or null
*/
public Index findIndex(ServerSession session, String name) {
Index index = indexes.get(name);
if (index == null) {
index = session.findLocalTempTableIndex(name);
}
return index;
}
/**
* Try to find a table or view with this name. This method returns null if no object with this
* name exists. Local temporary tables are also returned.
*
* @param session the session
* @param name the object name
* @return the object or null
*/
public Table findTableOrView(ServerSession session, String name) {
Table table = tablesAndViews.get(name);
if (table == null && session != null) {
table = session.findLocalTempTable(name);
}
return table;
}
/**
* Flush the current value, including the margin, to disk.
*
* @param session the session
*/
public void flush(ServerSession session, long flushValueWithMargin) {
if (session == null || !database.isSysTableLockedBy(session)) {
// This session may not lock the sys table (except if it already has
// locked it) because it must be committed immediately, otherwise
// other threads can not access the sys table.
ServerSession sysSession = database.getSystemSession();
synchronized (sysSession) {
flushInternal(sysSession, flushValueWithMargin);
sysSession.commit(false);
}
} else {
synchronized (session) {
flushInternal(session, flushValueWithMargin);
}
}
}
/**
* Create a unique index name.
*
* @param session the session
* @param table the indexed table
* @param prefix the index name prefix
* @return the unique name
*/
public String getUniqueIndexName(ServerSession session, Table table, String prefix) {
HashMap<String, Index> tableIndexes;
if (table.isTemporary() && !table.isGlobalTemporary()) {
tableIndexes = session.getLocalTempTableIndexes();
} else {
tableIndexes = indexes;
}
return getUniqueName(table, tableIndexes, prefix);
}
/**
* Create a unique constraint name.
*
* @param session the session
* @param table the constraint table
* @return the unique name
*/
public String getUniqueConstraintName(ServerSession session, Table table) {
HashMap<String, Constraint> tableConstraints;
if (table.isTemporary() && !table.isGlobalTemporary()) {
tableConstraints = session.getLocalTempTableConstraints();
} else {
tableConstraints = constraints;
}
return getUniqueName(table, tableConstraints, "CONSTRAINT_");
}
/**
* Get the table or view with the given name. Local temporary tables are also returned.
*
* @param session the session
* @param name the table or view name
* @return the table or view
* @throws DbException if no such object exists
*/
public Table getTableOrView(ServerSession session, String name) {
Table table = tablesAndViews.get(name);
if (table == null) {
if (session != null) {
table = session.findLocalTempTable(name);
}
if (table == null) {
throw DbException.get(ErrorCode.TABLE_OR_VIEW_NOT_FOUND_1, name);
}
}
return table;
}
