/** INTERNAL */
public JdbcConnection(ConnectionInfo ci, boolean useBaseDir) throws SQLException {
try {
if (useBaseDir) {
String baseDir = SysProperties.getBaseDir();
if (baseDir != null) {
ci.setBaseDir(baseDir);
}
}
checkJavaVersion();
// this will return an embedded or server connection
session = new SessionRemote().createSession(ci);
trace = session.getTrace();
int id = getNextId(TraceObject.CONNECTION);
setTrace(trace, TraceObject.CONNECTION, id);
this.user = ci.getUserName();
if (isInfoEnabled()) {
trace.infoCode(
"Connection "
+ getTraceObjectName()
+ " = DriverManager.getConnection("
+ quote(ci.getOriginalURL())
+ ", "
+ quote(user)
+ ", \"\");");
}
this.url = ci.getURL();
openStackTrace = new Exception("Stack Trace");
} catch (Exception e) {
throw logAndConvert(e);
}
}
@Override
public ConnectionInfo clone() throws CloneNotSupportedException {
ConnectionInfo clone = (ConnectionInfo) super.clone();
clone.prop = (Properties) prop.clone();
clone.filePasswordHash = Utils.cloneByteArray(filePasswordHash);
clone.fileEncryptionKey = Utils.cloneByteArray(fileEncryptionKey);
clone.userPasswordHash = Utils.cloneByteArray(userPasswordHash);
return clone;
}
private Transfer initTransfer(ConnectionInfo ci, String db, String server) throws IOException {
Socket socket = NetUtils.createSocket(server, Constants.DEFAULT_TCP_PORT, ci.isSSL());
Transfer trans = new Transfer(this);
trans.setSocket(socket);
trans.setSSL(ci.isSSL());
trans.init();
trans.writeInt(Constants.TCP_PROTOCOL_VERSION_6);
trans.writeInt(Constants.TCP_PROTOCOL_VERSION_15);
trans.writeString(db);
trans.writeString(ci.getOriginalURL());
trans.writeString(ci.getUserName());
trans.writeBytes(ci.getUserPasswordHash());
trans.writeBytes(ci.getFilePasswordHash());
String[] keys = ci.getKeys();
trans.writeInt(keys.length);
for (String key : keys) {
trans.writeString(key).writeString(ci.getProperty(key));
}
try {
done(trans);
clientVersion = trans.readInt();
trans.setVersion(clientVersion);
if (clientVersion >= Constants.TCP_PROTOCOL_VERSION_14) {
if (ci.getFileEncryptionKey() != null) {
trans.writeBytes(ci.getFileEncryptionKey());
}
}
trans.writeInt(SessionRemote.SESSION_SET_ID);
trans.writeString(sessionId);
done(trans);
if (clientVersion >= Constants.TCP_PROTOCOL_VERSION_15) {
autoCommit = trans.readBoolean();
} else {
autoCommit = true;
}
return trans;
} catch (DbException e) {
trans.close();
throw e;
}
}
/**
* Open a new (remote or embedded) session.
*
* @param openNew whether to open a new session in any case
* @return the session
*/
public SessionInterface connectEmbeddedOrServer(boolean openNew) {
ConnectionInfo ci = connectionInfo;
if (ci.isRemote()) {
connectServer(ci);
return this;
}
// create the session using reflection,
// so that the JDBC layer can be compiled without it
boolean autoServerMode = Boolean.parseBoolean(ci.getProperty("AUTO_SERVER", "false"));
ConnectionInfo backup = null;
try {
if (autoServerMode) {
backup = ci.clone();
connectionInfo = ci.clone();
}
if (openNew) {
ci.setProperty("OPEN_NEW", "true");
}
if (sessionFactory == null) {
sessionFactory =
(SessionFactory)
Class.forName("org.h2.engine.Engine").getMethod("getInstance").invoke(null);
}
return sessionFactory.createSession(ci);
} catch (Exception re) {
DbException e = DbException.convert(re);
if (e.getErrorCode() == ErrorCode.DATABASE_ALREADY_OPEN_1) {
if (autoServerMode) {
String serverKey = ((JdbcSQLException) e.getSQLException()).getSQL();
if (serverKey != null) {
backup.setServerKey(serverKey);
// OPEN_NEW must be removed now, otherwise
// opening a session with AUTO_SERVER fails
// if another connection is already open
backup.removeProperty("OPEN_NEW", null);
connectServer(backup);
return this;
}
}
}
throw e;
}
}
@Override
public void run() {
try {
transfer.init();
trace("Connect");
// TODO server: should support a list of allowed databases
// and a list of allowed clients
try {
// 如果没有加-tcpAllowOthers参数，那么只接受本地连接
if (!server.allow(transfer.getSocket())) {
throw DbException.get(ErrorCode.REMOTE_CONNECTION_NOT_ALLOWED);
}
int minClientVersion = transfer.readInt();
if (minClientVersion < Constants.TCP_PROTOCOL_VERSION_6) {
throw DbException.get(
ErrorCode.DRIVER_VERSION_ERROR_2,
"" + clientVersion,
"" + Constants.TCP_PROTOCOL_VERSION_6);
} else if (minClientVersion > Constants.TCP_PROTOCOL_VERSION_12) {
throw DbException.get(
ErrorCode.DRIVER_VERSION_ERROR_2,
"" + clientVersion,
"" + Constants.TCP_PROTOCOL_VERSION_12);
}
int maxClientVersion = transfer.readInt();
if (maxClientVersion >= Constants.TCP_PROTOCOL_VERSION_12) {
clientVersion = Constants.TCP_PROTOCOL_VERSION_12;
} else {
clientVersion = minClientVersion;
}
transfer.setVersion(clientVersion);
String db = transfer.readString();
String originalURL = transfer.readString();
if (db == null && originalURL == null) {
String targetSessionId = transfer.readString();
int command = transfer.readInt();
stop = true;
if (command == SessionRemote.SESSION_CANCEL_STATEMENT) {
// cancel a running statement
int statementId = transfer.readInt();
server.cancelStatement(targetSessionId, statementId);
} else if (command == SessionRemote.SESSION_CHECK_KEY) {
// check if this is the correct server
db = server.checkKeyAndGetDatabaseName(targetSessionId);
if (!targetSessionId.equals(db)) {
transfer.writeInt(SessionRemote.STATUS_OK);
} else {
transfer.writeInt(SessionRemote.STATUS_ERROR);
}
}
}
// 启动TcpServer时加"-baseDir"或者像这样System.setProperty("h2.baseDir", "E:\\H2\\baseDir")
String baseDir = server.getBaseDir();
if (baseDir == null) {
baseDir = SysProperties.getBaseDir();
}
// 例如启动TcpServer时，指定了"-key mydb mydatabase"，
// 如果db变量是mydb，那么实际上就是mydatabase，相当于做一次映射
// 如果db变量不是mydb，那么抛错: org.h2.jdbc.JdbcSQLException: Wrong user name or password [28000-170]
db = server.checkKeyAndGetDatabaseName(db);
ConnectionInfo ci = new ConnectionInfo(db);
ci.setOriginalURL(originalURL);
ci.setUserName(transfer.readString());
// password参数的值已经转换成userPasswordHash和filePasswordHash了，
// 不能由userPasswordHash和filePasswordHash得到原始的password
ci.setUserPasswordHash(transfer.readBytes());
ci.setFilePasswordHash(transfer.readBytes()); // 只有指定"CIPHER"参数时filePasswordHash才是非null的
int len = transfer.readInt();
for (int i = 0; i < len; i++) {
ci.setProperty(transfer.readString(), transfer.readString());
}
// override client's requested properties with server settings
if (baseDir != null) {
ci.setBaseDir(baseDir);
}
if (server.getIfExists()) {
// 启动TcpServer时加"-ifExists"，限制只有数据库存在时客户端才能连接，也就是不允许在客户端创建数据库
ci.setProperty("IFEXISTS", "TRUE");
}
session = Engine.getInstance().createSession(ci);
transfer.setSession(session);
transfer.writeInt(SessionRemote.STATUS_OK);
transfer.writeInt(clientVersion);
transfer.flush();
// 每建立一个新的Session对象时，把它保存到内存数据库management_db_9092的SESSIONS表
server.addConnection(threadId, originalURL, ci.getUserName());
trace("Connected");
} catch (Throwable e) {
sendError(e);
stop = true;
}
while (!stop) {
try {
process();
} catch (Throwable e) {
sendError(e);
}
}
trace("Disconnect");
} catch (Throwable e) {
server.traceError(e);
} finally {
close();
}
}
private void connectServer(ConnectionInfo ci) {
String name = ci.getName();
if (name.startsWith("//")) {
name = name.substring("//".length());
}
int idx = name.indexOf('/');
if (idx < 0) {
throw ci.getFormatException();
}
databaseName = name.substring(idx + 1);
String server = name.substring(0, idx);
traceSystem = new TraceSystem(null);
String traceLevelFile = ci.getProperty(SetTypes.TRACE_LEVEL_FILE, null);
if (traceLevelFile != null) {
int level = Integer.parseInt(traceLevelFile);
String prefix = getFilePrefix(SysProperties.CLIENT_TRACE_DIRECTORY);
try {
traceSystem.setLevelFile(level);
if (level > 0 && level < 4) {
String file = FileUtils.createTempFile(prefix, Constants.SUFFIX_TRACE_FILE, false, false);
traceSystem.setFileName(file);
}
} catch (IOException e) {
throw DbException.convertIOException(e, prefix);
}
}
String traceLevelSystemOut = ci.getProperty(SetTypes.TRACE_LEVEL_SYSTEM_OUT, null);
if (traceLevelSystemOut != null) {
int level = Integer.parseInt(traceLevelSystemOut);
traceSystem.setLevelSystemOut(level);
}
trace = traceSystem.getTrace(Trace.JDBC);
String serverList = null;
if (server.indexOf(',') >= 0) {
serverList = StringUtils.quoteStringSQL(server);
ci.setProperty("CLUSTER", Constants.CLUSTERING_ENABLED);
}
autoReconnect = Boolean.parseBoolean(ci.getProperty("AUTO_RECONNECT", "false"));
// AUTO_SERVER implies AUTO_RECONNECT
boolean autoServer = Boolean.parseBoolean(ci.getProperty("AUTO_SERVER", "false"));
if (autoServer && serverList != null) {
throw DbException.getUnsupportedException("autoServer && serverList != null");
}
autoReconnect |= autoServer;
if (autoReconnect) {
String className = ci.getProperty("DATABASE_EVENT_LISTENER");
if (className != null) {
className = StringUtils.trim(className, true, true, "'");
try {
eventListener = (DatabaseEventListener) JdbcUtils.loadUserClass(className).newInstance();
} catch (Throwable e) {
throw DbException.convert(e);
}
}
}
cipher = ci.getProperty("CIPHER");
if (cipher != null) {
fileEncryptionKey = MathUtils.secureRandomBytes(32);
}
String[] servers = StringUtils.arraySplit(server, ',', true);
int len = servers.length;
transferList.clear();
sessionId = StringUtils.convertBytesToHex(MathUtils.secureRandomBytes(32));
// TODO cluster: support more than 2 connections
boolean switchOffCluster = false;
try {
for (int i = 0; i < len; i++) {
String s = servers[i];
try {
Transfer trans = initTransfer(ci, databaseName, s);
transferList.add(trans);
} catch (IOException e) {
if (len == 1) {
throw DbException.get(ErrorCode.CONNECTION_BROKEN_1, e, e + ": " + s);
}
switchOffCluster = true;
}
}
checkClosed();
if (switchOffCluster) {
switchOffCluster();
}
checkClusterDisableAutoCommit(serverList);
} catch (DbException e) {
traceSystem.close();
throw e;
}
}
