@Override
public Value createBlob(InputStream in, long maxLength) {
init();
int type = Value.BLOB;
if (maxLength < 0) {
maxLength = Long.MAX_VALUE;
}
int max = (int) Math.min(maxLength, database.getMaxLengthInplaceLob());
try {
if (max != 0 && max < Integer.MAX_VALUE) {
BufferedInputStream b = new BufferedInputStream(in, max);
b.mark(max);
byte[] small = new byte[max];
int len = IOUtils.readFully(b, small, max);
if (len < max) {
if (len < small.length) {
small = Arrays.copyOf(small, len);
}
return ValueLobDb.createSmallLob(type, small);
}
b.reset();
in = b;
}
if (maxLength != Long.MAX_VALUE) {
in = new LimitInputStream(in, maxLength);
}
return createLob(in, type);
} catch (IllegalStateException e) {
throw DbException.get(ErrorCode.OBJECT_CLOSED, e);
} catch (IOException e) {
throw DbException.convertIOException(e, null);
}
}
@Override
public void prepare() {
if (columns == null) {
// 如INSERT INTO InsertTest DEFAULT VALUES
if (list.size() > 0 && list.get(0).length == 0) {
// special case where table is used as a sequence
columns = new Column[0];
} else { // 如INSERT INTO InsertTest(SELECT * FROM tmpSelectTest)
columns = table.getColumns();
}
}
if (list.size() > 0) {
for (Expression[] expr : list) {
if (expr.length != columns.length) {
throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
}
for (int i = 0, len = expr.length; i < len; i++) {
Expression e = expr[i];
if (e != null) {
e = e.optimize(session);
if (e instanceof Parameter) {
Parameter p = (Parameter) e;
p.setColumn(columns[i]);
}
expr[i] = e;
}
}
}
} else {
query.prepare();
if (query.getColumnCount() != columns.length) {
throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
}
}
}
@Override
public int update() {
session.getUser().checkAdmin();
session.commit(true);
Database db = session.getDatabase();
if (db.findRole(userName) != null) {
throw DbException.get(ErrorCode.ROLE_ALREADY_EXISTS_1, userName);
}
if (db.findUser(userName) != null) {
if (ifNotExists) {
return 0;
}
throw DbException.get(ErrorCode.USER_ALREADY_EXISTS_1, userName);
}
int id = getObjectId();
User user = new User(db, id, userName, false);
user.setAdmin(admin);
user.setComment(comment);
if (hash != null && salt != null) {
user.setSaltAndHash(getByteArray(salt), getByteArray(hash));
} else if (password != null) {
char[] passwordChars = getCharArray(password);
byte[] userPasswordHash;
if (userName.length() == 0 && passwordChars.length == 0) {
userPasswordHash = new byte[0];
} else {
userPasswordHash = SHA256.getKeyPasswordHash(userName, passwordChars);
}
user.setUserPasswordHash(userPasswordHash);
} else {
throw DbException.throwInternalError();
}
db.addDatabaseObject(session, user);
return 0;
}
/**
* Undo all operations back to the log position of the given savepoint.
*
* @param name the savepoint name
*/
public void rollbackToSavepoint(String name) {
checkCommitRollback();
if (savepoints == null) {
throw DbException.get(ErrorCode.SAVEPOINT_IS_INVALID_1, name);
}
Savepoint savepoint = savepoints.get(name);
if (savepoint == null) {
throw DbException.get(ErrorCode.SAVEPOINT_IS_INVALID_1, name);
}
rollbackTo(savepoint, false);
}
/**
* INTERNAL. Check if this connection is closed.
*
* @param write if the next operation is possibly writing
* @throws SQLException if the connection or session is closed
*/
protected void checkClosed(boolean write) throws SQLException {
if (session == null) {
throw DbException.get(ErrorCode.OBJECT_CLOSED);
}
if (session.isClosed()) {
throw DbException.get(ErrorCode.DATABASE_CALLED_AT_SHUTDOWN);
}
if (session.isReconnectNeeded(write)) {
trace.debug("reconnect");
closePreparedCommands();
session = session.reconnect(write);
setTrace(session.getTrace());
}
}
/**
* Parse a string to a ValueTime.
*
* @param s the string to parse
* @return the time
*/
public static ValueTime parse(String s) {
try {
return fromNanos(DateTimeUtils.parseTimeNanos(s, 0, s.length(), false));
} catch (Exception e) {
throw DbException.get(ErrorCode.INVALID_DATETIME_CONSTANT_2, e, "TIME", s);
}
}
/**
* Parse and prepare the given SQL statement. This method also checks if the connection has been
* closed.
*
* @param sql the SQL statement
* @return the prepared statement
*/
public Command prepareLocal(String sql) {
if (closed) {
throw DbException.get(ErrorCode.CONNECTION_BROKEN_1, "session closed");
}
Command command;
if (queryCacheSize > 0) {
if (queryCache == null) {
queryCache = SmallLRUCache.newInstance(queryCacheSize);
modificationMetaID = database.getModificationMetaId();
} else {
long newModificationMetaID = database.getModificationMetaId();
if (newModificationMetaID != modificationMetaID) {
queryCache.clear();
modificationMetaID = newModificationMetaID;
}
command = queryCache.get(sql);
if (command != null && command.canReuse()) {
command.reuse();
return command;
}
}
}
Parser parser = new Parser(this);
command = parser.prepareCommand(sql);
if (queryCache != null) {
if (command.isCacheable()) {
queryCache.put(sql, command);
}
}
return command;
}
@Override
public Value getValue(Session session) {
query.setSession(session);
ResultInterface result = query.query(2);
try {
int rowcount = result.getRowCount();
if (rowcount > 1) {
throw DbException.get(ErrorCode.SCALAR_SUBQUERY_CONTAINS_MORE_THAN_ONE_ROW);
}
Value v;
if (rowcount <= 0) {
v = ValueNull.INSTANCE;
} else {
result.next();
Value[] values = result.currentRow();
if (result.getVisibleColumnCount() == 1) {
v = values[0];
} else {
v = ValueArray.get(values);
}
}
return v;
} finally {
result.close();
}
}
/**
* Creates a new sequence.
*
* @param schema the schema
* @param id the object id
* @param name the sequence name
* @param startValue the first value to return
* @param increment the increment count
* @param cacheSize the number of entries to pre-fetch
* @param minValue the minimum value
* @param maxValue the maximum value
* @param cycle whether to jump back to the min value if needed
* @param belongsToTable whether this sequence belongs to a table (for auto-increment columns)
*/
public Sequence(
Schema schema,
int id,
String name,
Long startValue,
Long increment,
Long cacheSize,
Long minValue,
Long maxValue,
boolean cycle,
boolean belongsToTable) {
initSchemaObjectBase(schema, id, name, Trace.SEQUENCE);
this.increment = increment != null ? increment : 1;
this.minValue = minValue != null ? minValue : getDefaultMinValue(startValue, this.increment);
this.maxValue = maxValue != null ? maxValue : getDefaultMaxValue(startValue, this.increment);
this.value = startValue != null ? startValue : getDefaultStartValue(this.increment);
this.valueWithMargin = value;
this.cacheSize = cacheSize != null ? Math.max(1, cacheSize) : DEFAULT_CACHE_SIZE;
this.cycle = cycle;
this.belongsToTable = belongsToTable;
if (!isValid(this.value, this.minValue, this.maxValue, this.increment)) {
throw DbException.get(
ErrorCode.SEQUENCE_ATTRIBUTES_INVALID,
name,
String.valueOf(this.value),
String.valueOf(this.minValue),
String.valueOf(this.maxValue),
String.valueOf(this.increment));
}
}
@Override
public Index getScanIndex(Session session) {
if (getStep(session) == 0) {
throw DbException.get(ErrorCode.STEP_SIZE_MUST_NOT_BE_ZERO);
}
return new RangeIndex(this, IndexColumn.wrap(columns));
}
/**
* The maximum number of rows, including uncommitted rows of any session.
*
* @return the maximum number of rows
*/
public long getRowCountMax() {
try {
return dataMap.sizeAsLongMax();
} catch (IllegalStateException e) {
throw DbException.get(ErrorCode.OBJECT_CLOSED, e);
}
}
/**
* Allows the start value, increment, min value and max value to be updated atomically, including
* atomic validation. Useful because setting these attributes one after the other could otherwise
* result in an invalid sequence state (e.g. min value > max value, start value < min value, etc).
*
* @param startValue the new start value (<code>null</code> if no change)
* @param minValue the new min value (<code>null</code> if no change)
* @param maxValue the new max value (<code>null</code> if no change)
* @param increment the new increment (<code>null</code> if no change)
*/
public synchronized void modify(Long startValue, Long minValue, Long maxValue, Long increment) {
if (startValue == null) {
startValue = this.value;
}
if (minValue == null) {
minValue = this.minValue;
}
if (maxValue == null) {
maxValue = this.maxValue;
}
if (increment == null) {
increment = this.increment;
}
if (!isValid(startValue, minValue, maxValue, increment)) {
throw DbException.get(
ErrorCode.SEQUENCE_ATTRIBUTES_INVALID,
getName(),
String.valueOf(this.value),
String.valueOf(this.minValue),
String.valueOf(this.maxValue),
String.valueOf(this.increment));
}
this.value = startValue;
this.valueWithMargin = startValue;
this.minValue = minValue;
this.maxValue = maxValue;
this.increment = increment;
}
/**
* Commit or roll back the given transaction.
*
* @param transactionName the name of the transaction
* @param commit true for commit, false for rollback
*/
public void setPreparedTransaction(String transactionName, boolean commit) {
if (currentTransactionName != null && currentTransactionName.equals(transactionName)) {
if (commit) {
commit(false);
} else {
rollback();
}
} else {
ArrayList<InDoubtTransaction> list = database.getInDoubtTransactions();
int state = commit ? InDoubtTransaction.COMMIT : InDoubtTransaction.ROLLBACK;
boolean found = false;
if (list != null) {
for (InDoubtTransaction p : list) {
if (p.getTransactionName().equals(transactionName)) {
p.setState(state);
found = true;
break;
}
}
}
if (!found) {
throw DbException.get(ErrorCode.TRANSACTION_NOT_FOUND_1, transactionName);
}
}
}
/**
* Split the password property into file password and user password if necessary, and convert them
* to the internal hash format.
*/
private void convertPasswords() {
char[] password = removePassword();
boolean passwordHash =
removeProperty("PASSWORD_HASH", false); // 如果PASSWORD_HASH参数是true那么不再进行SHA256
// 如果配置了CIPHER，则password包含两部份，用一个空格分开这两部份，第一部份是filePassword，第二部份是userPassword。
// 如果PASSWORD_HASH参数是true那么不再进行SHA256，此时必须使用16进制字符，字符个数是偶数。
// 如果PASSWORD_HASH参数是false，不必是16进制字符，会按SHA256算法进行hash
if (getProperty("CIPHER", null) != null) {
// split password into (filePassword+' '+userPassword)
int space = -1;
for (int i = 0, len = password.length; i < len; i++) {
if (password[i] == ' ') {
space = i;
break;
}
}
if (space < 0) {
throw DbException.get(ErrorCode.WRONG_PASSWORD_FORMAT);
}
char[] np = new char[password.length - space - 1];
char[] filePassword = new char[space];
System.arraycopy(password, space + 1, np, 0, np.length);
System.arraycopy(password, 0, filePassword, 0, space);
Arrays.fill(password, (char) 0);
password = np;
// filePasswordHash用"file"进行hash
fileEncryptionKey = FilePathEncrypt.getPasswordBytes(filePassword);
filePasswordHash = hashPassword(passwordHash, "file", filePassword);
}
// userPasswordHash用用户名进行hash
userPasswordHash = hashPassword(passwordHash, user, password);
}
private void readProperties(Properties info) {
Object[] list = new Object[info.size()];
info.keySet().toArray(list);
DbSettings s = null;
// 可在info中配三种参数，相关文档见:E:\H2\my-h2\my-h2-docs\999 可配置的参数汇总.java中的1、2、3项
for (Object k : list) {
String key = StringUtils.toUpperEnglish(k.toString());
if (prop.containsKey(key)) {
throw DbException.get(ErrorCode.DUPLICATE_PROPERTY_1, key);
}
Object value = info.get(k);
// 支持org.h2.command.dml.SetTypes中的参数和ConnectionInfo与connectionTime相关的参数
if (isKnownSetting(key)) {
prop.put(key, value);
} else {
if (s == null) {
s = getDbSettings();
}
// org.h2.constant.DbSettings中的参数
if (s.containsKey(key)) {
prop.put(key, value);
}
}
}
}
/**
* Sets the primary key columns, but also check if a primary key with different columns is already
* defined.
*
* @param columns the primary key columns
* @return true if the same primary key columns where already set
*/
private boolean setPrimaryKeyColumns(IndexColumn[] columns) {
if (pkColumns != null) {
int len = columns.length;
if (len != pkColumns.length) {
throw DbException.get(ErrorCode.SECOND_PRIMARY_KEY);
}
for (int i = 0; i < len; i++) {
if (!columns[i].columnName.equals(pkColumns[i].columnName)) {
throw DbException.get(ErrorCode.SECOND_PRIMARY_KEY);
}
}
return true;
}
this.pkColumns = columns;
return false;
}
/**
* Called to flush the output after data has been sent to the server and just before receiving
* data. This method also reads the status code from the server and throws any exception the
* server sent.
*
* @param transfer the transfer object
* @throws DbException if the server sent an exception
* @throws IOException if there is a communication problem between client and server
*/
public void done(Transfer transfer) throws IOException {
transfer.flush();
int status = transfer.readInt();
if (status == STATUS_ERROR) {
String sqlstate = transfer.readString();
String message = transfer.readString();
String sql = transfer.readString();
int errorCode = transfer.readInt();
String stackTrace = transfer.readString();
JdbcSQLException s =
new JdbcSQLException(message, sql, sqlstate, errorCode, null, stackTrace);
if (errorCode == ErrorCode.CONNECTION_BROKEN_1) {
// allow re-connect
IOException e = new IOException(s.toString(), s);
throw e;
}
throw DbException.convert(s);
} else if (status == STATUS_CLOSED) {
transferList = null;
} else if (status == STATUS_OK_STATE_CHANGED) {
sessionStateChanged = true;
} else if (status == STATUS_OK) {
// ok
} else {
throw DbException.get(ErrorCode.CONNECTION_BROKEN_1, "unexpected status " + status);
}
}
@Override
public void createDirectory() {
if (exists() && isDirectory()) {
throw DbException.get(
ErrorCode.FILE_CREATION_FAILED_1, name + " (a file with this name already exists)");
}
// TODO directories are not really supported
}
@Override
public Value modulus(Value v) {
ValueByte other = (ValueByte) v;
if (other.value == 0) {
throw DbException.get(ErrorCode.DIVISION_BY_ZERO_1, getSQL());
}
return ValueByte.get((byte) (value % other.value));
}
public Index getScanIndex(Session session) {
if (createException != null) {
String msg = createException.getMessage();
throw DbException.get(ErrorCode.VIEW_IS_INVALID_2, createException, getSQL(), msg);
}
PlanItem item = getBestPlanItem(session, null);
return item.getIndex();
}
@Override
public long getRowCountApproximation() {
try {
return dataMap.map.sizeAsLong();
} catch (IllegalStateException e) {
throw DbException.get(ErrorCode.OBJECT_CLOSED);
}
}
public int update() {
session.getUser().checkAdmin();
session.commit(true);
Database db = session.getDatabase();
Sequence sequence = getSchema().findSequence(sequenceName);
if (sequence == null) {
if (!ifExists) {
throw DbException.get(ErrorCode.SEQUENCE_NOT_FOUND_1, sequenceName);
}
} else {
if (sequence.getBelongsToTable()) {
throw DbException.get(ErrorCode.SEQUENCE_BELONGS_TO_A_TABLE_1, sequenceName);
}
db.removeSchemaObject(session, sequence);
}
return 0;
}
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);
}
}
}
/**
* Add a local temporary index to this session.
*
* @param index the index to add
* @throws DbException if a index with this name already exists
*/
public void addLocalTempTableIndex(Index index) {
if (localTempTableIndexes == null) {
localTempTableIndexes = database.newStringMap();
}
if (localTempTableIndexes.get(index.getName()) != null) {
throw DbException.get(ErrorCode.INDEX_ALREADY_EXISTS_1, index.getSQL());
}
localTempTableIndexes.put(index.getName(), index);
}
@Override
public double getCost(Session session, int[] masks, TableFilter filter, SortOrder sortOrder) {
try {
long cost = 10 * (dataMap.map.sizeAsLong() + Constants.COST_ROW_OFFSET);
return cost;
} catch (IllegalStateException e) {
throw DbException.get(ErrorCode.OBJECT_CLOSED);
}
}
/**
* Create a duplicate key exception with a message that contains the index name.
*
* @param key the key values
* @return the exception
*/
protected DbException getDuplicateKeyException(String key) {
String sql = getName() + " ON " + table.getSQL() + "(" + getColumnListSQL() + ")";
if (key != null) {
sql += " VALUES " + key;
}
DbException e = DbException.get(ErrorCode.DUPLICATE_KEY_1, sql);
e.setSource(this);
return e;
}
/**
* Keep a collection of the columns to pass to update if a duplicate key happens, for MySQL-style
* INSERT ... ON DUPLICATE KEY UPDATE ....
*
* @param column the column
* @param expression the expression
*/
public void addAssignmentForDuplicate(Column column, Expression expression) {
if (duplicateKeyAssignmentMap == null) {
duplicateKeyAssignmentMap = New.hashMap();
}
if (duplicateKeyAssignmentMap.containsKey(column)) {
throw DbException.get(ErrorCode.DUPLICATE_COLUMN_NAME_1, column.getName());
}
duplicateKeyAssignmentMap.put(column, expression);
}
/**
* Add a local temporary table to this session.
*
* @param table the table to add
* @throws DbException if a table with this name already exists
*/
public void addLocalTempTable(Table table) {
if (localTempTables == null) {
localTempTables = database.newStringMap();
}
if (localTempTables.get(table.getName()) != null) {
throw DbException.get(ErrorCode.TABLE_OR_VIEW_ALREADY_EXISTS_1, table.getSQL());
}
modificationId++;
localTempTables.put(table.getName(), table);
}
@Override
public void add(Session session, Row row) {
if (mainIndexColumn == -1) {
if (row.getKey() == 0) {
row.setKey(++lastKey);
}
} else {
long c = row.getValue(mainIndexColumn).getLong();
row.setKey(c);
}
if (mvTable.getContainsLargeObject()) {
for (int i = 0, len = row.getColumnCount(); i < len; i++) {
Value v = row.getValue(i);
Value v2 = v.link(database, getId());
if (v2.isLinked()) {
session.unlinkAtCommitStop(v2);
}
if (v != v2) {
row.setValue(i, v2);
}
}
}
TransactionMap<Value, Value> map = getMap(session);
Value key = ValueLong.get(row.getKey());
Value old = map.getLatest(key);
if (old != null) {
String sql = "PRIMARY KEY ON " + table.getSQL();
if (mainIndexColumn >= 0 && mainIndexColumn < indexColumns.length) {
sql += "(" + indexColumns[mainIndexColumn].getSQL() + ")";
}
DbException e = DbException.get(ErrorCode.DUPLICATE_KEY_1, sql);
e.setSource(this);
throw e;
}
try {
map.put(key, ValueArray.get(row.getValueList()));
} catch (IllegalStateException e) {
throw DbException.get(ErrorCode.CONCURRENT_UPDATE_1, table.getName());
}
lastKey = Math.max(lastKey, row.getKey());
}
/**
* Add a local temporary constraint to this session.
*
* @param constraint the constraint to add
* @throws DbException if a constraint with the same name already exists
*/
public void addLocalTempTableConstraint(Constraint constraint) {
if (localTempTableConstraints == null) {
localTempTableConstraints = database.newStringMap();
}
String name = constraint.getName();
if (localTempTableConstraints.get(name) != null) {
throw DbException.get(ErrorCode.CONSTRAINT_ALREADY_EXISTS_1, constraint.getSQL());
}
localTempTableConstraints.put(name, constraint);
}
