我有一个 Web 服务应用程序，其中包含在应用程序加载到数据库时启动 HSQLDB 的代码。应用程序中的所有内容都按预期运行，包括连接到数据库、执行过程、创建表和运行查询，没有任何问题。但是，我试图编写一个单独的应用程序来连接到同一数据库并检索数据，但无法建立连接。我已经阅读了文档，但我要么不完全理解它，要么忽略了一些东西。
WEB服务应用程序代码如下：
文件：HSQLServer.java（包含初始化HSQL SERVER的代码）
private HsqlServer() {
//initialze new server
hsqlServer = new Server();
hsqlServer.setLogWriter(null);
hsqlServer.setSilent(true);
// can use custom writer
hsqlServer.setLogWriter(null);
hsqlServer.setErrWriter(null);
}
public void startServer(String dbName, String dbPath) {
try {
HsqlProperties p = new HsqlProperties();
//dbName: "hsqldb" dbPath: "file:/usr/share/tomcat/webapps/TicketingAPIWS/DB/hsqldb"
p.setProperty("server.database.0", "file:" + dbPath);
p.setProperty("server.dbname.0", dbName);
//set properties for DB
hsqlServer.setProperties(p);
//start the database!
hsqlServer.start();
LogUtils.log(CustomLogger.LogType.DEBUG, Boolean.TRUE, String.format("startServer:HSQL Database Server Has been Started"));
} catch(Exception ex) {
LogUtils.logException(CustomLogger.LogType.SEVERE, Boolean.TRUE, "startServer:Exception due to", ex);
}
}
文件：从主 WS 应用程序中的侦听器调用：启动 HSQLDB 并创建连接以执行存储过程，该过程运行良好
public static void initDB(ServletContext sc) {
Connection conn = null;
ConfigMgr configMgr = new ConfigMgr(sc);
LogUtils.setupConfigurationMgr(configMgr);
try {
boolean serverStatus = startHsqlServer(getDBName(configMgr), getDBPath(configMgr));
LogUtils.log(CustomLogger.LogType.DEBUG, Boolean.TRUE, String.format("initDB: Hsql Server Status=[%s]",serverStatus));
//check if Hsql server is running
if(serverStatus) {
//get connection from the connection pool
conn = getDefaultDatabaseConnection(configMgr);
//add today's date as newDay in system_config
addToSysConfig(conn, "newDay", new SimpleDateFormat("yyyy-MM-dd").format(Calendar.getInstance().getTime()));
}
LogUtils.log(CustomLogger.LogType.DEBUG, Boolean.TRUE, "initDB: Successfully initialized the database");
} else {
LogUtils.log(CustomLogger.LogType.SEVERE, Boolean.TRUE, "initDB: Failed to initialize the database");
}
} catch(Exception ex){
LogUtils.logException(CustomLogger.LogType.SEVERE, Boolean.TRUE, "initDB: Exception due to", ex);
} finally {
closeConnections(conn);
}
}
这是我的连接字符串：
url="jdbc:hsqldb:hsql://localhost/hsqldb;file:/usr/share/tomcat/webapps/TicketingAPIWS/DB/hsqldb"外部JAVA ANT APP
现在我已经运行了数据库服务器。所以我尝试从我编写的外部应用程序访问 HSQLDB，如下所示：
public static void main(String[] args) {
Connection conn1 = null;
// Display versions
//clntObj.displayAppVersion(args);
try {
Class.forName("org.hsqldb.jdbcDriver");
//jdbc:hsqldb:hsql://localhost/pgmcdb
//conn1 = DriverManager.getConnection("jdbc:hsqldb:hsql://localhost/hsqldb;file:/usr/share/tomcat/webapps/TicketingAPIWS/DB/hsqldb;server.remote_open=true;", "SA", "");
conn1 = DriverManager.getConnection("jdbc:hsqldb:file:/usr/share/tomcat/webapps/TicketingAPIWS/DB/hsqldb;server.remote_open=true;", "sa", "");
System.out.println(conn1);
Statement s = conn1.createStatement();
ResultSet rs = s.executeQuery ("SELECT web_client_id FROM client_sign_on;");
while(rs.next()) {
System.out.println("Table_Name: " + rs.getString(1) );
}
} catch (ClassNotFoundException ex) {
Logger.getLogger(HsqlClient.class.getName()).log(Level.SEVERE, null, ex);
} catch (SQLException ex) {
Logger.getLogger(HsqlClient.class.getName()).log(Level.SEVERE, null, ex);
} finally {
if(conn1 != null){
try {
conn1.close();
} catch (SQLException ex) {
Logger.getLogger(HsqlClient.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
给出了这个错误：
SEVERE: null
java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: client_sign_on
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source)
at org.hsqldb.jdbc.JDBCStatement.executeQuery(Unknown Source)
at hsqlclient.HsqlClient.main(HsqlClient.java:173)
Caused by: org.hsqldb.HsqlException: user lacks privilege or object not found: client_sign_on
at org.hsqldb.error.Error.error(Unknown Source)
at org.hsqldb.error.Error.error(Unknown Source)
at org.hsqldb.ParserDQL.readTableName(Unknown Source)
at org.hsqldb.ParserDQL.readTableOrSubquery(Unknown Source)
at org.hsqldb.ParserDQL.XreadTableReference(Unknown Source)
at org.hsqldb.ParserDQL.XreadFromClause(Unknown Source)
at org.hsqldb.ParserDQL.XreadTableExpression(Unknown Source)
at org.hsqldb.ParserDQL.XreadQuerySpecification(Unknown Source)
at org.hsqldb.ParserDQL.XreadSimpleTable(Unknown Source)
at org.hsqldb.ParserDQL.XreadQueryPrimary(Unknown Source)
at org.hsqldb.ParserDQL.XreadQueryTerm(Unknown Source)
at org.hsqldb.ParserDQL.XreadQueryExpressionBody(Unknown Source)
at org.hsqldb.ParserDQL.XreadQueryExpression(Unknown Source)
at org.hsqldb.ParserDQL.compileCursorSpecification(Unknown Source)
at org.hsqldb.ParserCommand.compilePart(Unknown Source)
at org.hsqldb.ParserCommand.compileStatements(Unknown Source)
at org.hsqldb.Session.executeDirectStatement(Unknown Source)
at org.hsqldb.Session.execute(Unknown Source)
... 3 more
表存在并且命名正确。我在数据库中有一条记录，我可以使用 SQL 工具访问它，一切似乎都按顺序进行。但是，我无法从 Web 服务应用程序外部访问数据库，并且找不到任何解释如何执行此操作的资源。
服务器通过 Tomcat 启动后，日志消息应显示 HSQL 服务器已启动。您的代码显示您已为此数据库选择了 URL 名称
hsqldb现在您可以使用以下 URL 从 Tomcat 外部连接到服务器：
jdbc:hsqldb:hsql://localhost/hsqldb
请注意，一旦您启动了具有给定数据库的服务器，您只能通过服务器访问数据库，并且不允许通过
jdbc:hsqldb:file/...