查询多结果子查询不使用jdbc

Question

我一直在研究这个具体问题几天,但找不到任何解决方案.因此,我在这里.

情况:

• 表1列出了系统上的所有JBoss
• 表2描绘了JBoss和JBoss之间的1:n关系,因为任何给定的JBoss都可以有一个或多个JBoss,它就是"说话".
• 我有一个带有JDBC的Java servlet连接到数据库并发出查询和.jsp页面来显示结果

编辑:

我打算如何处理查询:我的servlet正在尝试显示连接到给定jboss的所有信息.用户从jsp页面的jboss名称列表中选择一个jboss.然后执行查询并发生错误.

EDIT2:

where in在测试applet时,将查询更改为内部子选择会导致相同的错误

EDIT4:

尝试使用查询作为脚本创建视图,然后尝试从创建的视图中获取所有条目select * from vtest但没有成功.

问题:

当我尝试select使用servlet 运行以下内容时,会产生ORA-01427.如果我运行此语句,Toad for Oracle我会得到所需的结果.

select * from table1 where number in (
select jboss2 from table2 where jboss1 = (
select number from table1 where name = 'nam1'))

问题: 查询中是否存在我遗漏的内容？是否有可能jdbc无法处理具有多行的子查询,即使查询本身是正确的？

表格1:

+--------+------+-----------+
| Number | Name | values... |
+--------+------+-----------+
| 000001 | nam1 | vals1     |
| 000002 | nam2 | vals2     |
| 000003 | nam3 | vals3     |
+--------+------+-----------+

表2:

+--------+--------+
| JBoss1 | JBoss2 |
+--------+--------+
| 000001 | 000002 |
| 000001 | 000003 |
| 000002 | 000003 |
+--------+--------+

结果Toad/Desired结果:

+--------+------+-----------+
| Number | Name | values... |
+--------+------+-----------+
| 000002 | nam2 | vals2     |
| 000003 | nam3 | vals3     |
+--------+------+-----------+

EDIT3:

相关的Java类.省略了不相关的查询.

class QuickInfoAction implements Action{

    @Override
    public String execute(HttpServletRequest request, HttpServletResponse response) throws ActionException {
        Connection conn = null;
        PreparedStatement prep = null;
        ResultSet rs = null;
        Map<String,String> queries = Queries.getInfoQueries(request);

        try {
            conn = DatabaseConnector.getConnection();
            Map<String, Result> res = new HashMap<String, Result>();
            for (Map.Entry<String, String> entry: queries.entrySet()) {
                prep = conn.prepareStatement(entry.getValue()); 
                rs = prep.executeQuery();

                while(rs.next()) {
                    res.put(entry.getKey(), ResultSupport.toResult(rs));
                }       
            }

            request.setAttribute("results", res);

        } catch (Exception e) {
            throw new ActionException(e.getStackTrace().toString());
        } finally {
            try {
                conn.close();
                prep.close();
                rs.close();
            } catch (Exception e) {
                throw new ActionException(e.getStackTrace().toString());
            }
        }

        return "results";
    }

}


public static Map<String, String> getInfoQueries(HttpServletRequest request) {
    String jboss_res = "select jboss.name, jboss.port, jboss.apache_nummer, jboss.bere_mandant_id, "
            + "maschine.name as maschine, maschine.ip_adresse "
            + "from jboss "
            + "inner join maschine on jboss.maschine_nummer = maschine.nummer "
            + "where jboss.name = '" + request.getParameter("jboss") + "'";

    String jboss_db = "select datenbank.nummer, datenbank.name, db_schema.name as schema "
            + "from datenbank "
            + "inner join db_schema on datenbank.db_schema_nummer = db_schema.nummer "
            + "where datenbank.nummer = ("
                + "select datenbank_nummer "
                + "from jboss_datenbank "
                + "where jboss_nummer = ("
                    + "select nummer "
                    + "from jboss "
                    + "where name = '" + request.getParameter("jboss") + "'))";

    String jboss_tux = "select tuxedo.*, datenbank.name as datenbank, db_schema.name as schema "
            + "from tuxedo, datenbank,db_schema "
            + "where tuxedo.nummer = ("
                + "select tuxedo_nummer "
                + "from jboss "
                + "where name = '" + request.getParameter("jboss") + "') "
            + "and datenbank.nummer = ("
                + "select datenbank_nummer "
                + "from tuxedo_datenbank "
                + "where tuxedo_nummer = tuxedo.nummer) "
            + "and db_schema.nummer = ("
                + "select db_schema_nummer "
                + "from datenbank "
                + "where nummer = ("
                    + "select datenbank_nummer "
                    + "from tuxedo_datenbank "
                    + "where tuxedo_nummer = tuxedo.nummer))";
    String jboss_corr = "select * from jboss where nummer in ("
                + "select jboss_nummer_2 from jboss_corr where jboss_nummer_1 in ("
                + "select nummer from jboss where name = '" + request.getParameter("jboss") + "'))";

    Map<String, String> queries = new HashMap<String,String>();
    queries.put("jboss", jboss_res);
    queries.put("datenbank", jboss_db);
    queries.put("tuxedo", jboss_tux);
    queries.put("corr", jboss_corr);

return queries;

错误信息

03.07.2017 11:49:29,863 +0200 WARN  [at.itsv.ta2mig.jdbc.TA2MigOracleJDBCConnection] (hs0903 http-/0.0.0.0:8080-2)    ORA-01427: Unterabfrage für eine Zeile liefert mehr als eine Zeile

03.07.2017 11:49:29,864 +0200 INFO  [stdout] (hs0903 http-/0.0.0.0:8080-2)    error executing action

03.07.2017 11:49:29,864 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)    dbgr.exception.ActionException: [Ljava.lang.StackTraceElement;@46708550

03.07.2017 11:49:29,864 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at dbgr.action.QuickInfoAction.execute(QuickInfoAction.java:43)

03.07.2017 11:49:29,864 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at dbgr.servlet.ControllerServlet.doGet(ControllerServlet.java:28)

03.07.2017 11:49:29,865 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at dbgr.servlet.ControllerServlet.doPost(ControllerServlet.java:39)

03.07.2017 11:49:29,865 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)

03.07.2017 11:49:29,865 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)

03.07.2017 11:49:29,865 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295)

03.07.2017 11:49:29,865 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)

03.07.2017 11:49:29,865 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231)

03.07.2017 11:49:29,866 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149)

03.07.2017 11:49:29,866 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169)

03.07.2017 11:49:29,866 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150)

03.07.2017 11:49:29,866 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97)

03.07.2017 11:49:29,866 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102)

03.07.2017 11:49:29,866 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)

03.07.2017 11:49:29,866 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854)

03.07.2017 11:49:29,867 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653)

03.07.2017 11:49:29,867 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926)

03.07.2017 11:49:29,867 +0200 ERROR [stderr] (hs0903 http-/0.0.0.0:8080-2)      at java.lang.Thread.run(Thread.java:744)

Answer 1

我找到了解决方案。另一个查询也返回多个结果。该查询并非旨在这样做，因此失败了。这是我的疏忽。