具有多结果子查询的查询不适用于 jdbc
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【中文标题】具有多结果子查询的查询不适用于 jdbc【英文标题】:query with multiple-result subquery not working with jdbc 【发布时间】:2017-07-03 06:18:50 【问题描述】:我这几天一直在研究这个特定问题,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 的 1:n 关系,因为任何给定的 JBoss 都可以拥有一个或多个与其“对话”的 JBoss。 我有一个带有 JDBC 的 Java servlet 来连接到数据库并发出查询和 .jsp 页面来显示结果编辑:
我打算对查询做什么: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,出现错误。
EDIT2:
在测试小程序时将查询更改为内部子选择为where in
会导致相同的错误
EDIT4:
尝试使用查询作为脚本创建视图,然后尝试使用 select * from vtest
从创建的视图中获取所有条目,但没有成功。
问题:
当我尝试使用 servlet 运行以下 select
时,会导致 ORA-01427。如果我在 Toad for Oracle
中运行此语句,我会得到想要的结果。
select * from table1 where number in (
select jboss2 from table2 where jboss1 = (
select number from table1 where name = 'nam1'))
问题:
查询中是否缺少某些内容?即使查询本身是正确的,jdbc
是否可能无法处理具有多行结果的子查询?
表 1:
+--------+------+-----------+
| Number | Name | values... |
+--------+------+-----------+
| 000001 | nam1 | vals1 |
| 000002 | nam2 | vals2 |
| 000003 | nam3 | vals3 |
+--------+------+-----------+
表 2:
+--------+--------+
| JBoss1 | JBoss2 |
+--------+--------+
| 000001 | 000002 |
| 000001 | 000003 |
| 000002 | 000003 |
+--------+--------+
Toad 中的结果/所需结果:
+--------+------+-----------+
| Number | Name | values... |
+--------+------+-----------+
| 000002 | nam2 | vals2 |
| 000003 | nam3 | vals3 |
+--------+------+-----------+
EDIT3:
相关的 Java 类。省略不相关的查询。
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)
【问题讨论】:
这似乎是问题所在:select number from table1 where name = 'nam1'
...您确定两个地方的基础数据相同吗?
@harlequin:请告诉您查询背后的确切要求是什么?您想通过查询实现什么?可能您的查询本身可以简化并与 java 轻松集成。
您能否解释一下您对基础数据的含义以及为什么这个select
会成为问题?
我并不是说现有的查询会是问题所在。我只是问您查询的确切要求是什么?是否像获取具有 name=nam1 的 JBoss 与之交谈的所有 JBoss 的详细信息?
如果错误信息可信的话,我指出的子查询返回了多个记录。您需要找出发生这种情况的原因。
【参考方案1】:
似乎你也需要一个用于内部子选择的地方
select * from table1 where number in (
select jboss2 from table2 where jboss1 in (
select number from table1 where name = 'nam1'))
【讨论】:
我尝试过像这样更改内部选择但无济于事。它仍然导致相同的错误 检查得更好.. 错误 ORA-01427。是为了返回更多的行和 th 在 clasue 必须解决这个问题【参考方案2】:不确定为什么带有 where-in 的查询对您不起作用,但这里有一个查询,其中第二个子查询被替换为连接:
select * from table1 where number in (
select jboss2 from table2
join table1 on table2.jboss1 = table1.number
and table1.name = 'nam1'
)
【讨论】:
感谢查询版本,但不幸的是我仍然遇到同样的错误。【参考方案3】:我找到了解决方案。另一个查询也返回了多个结果。此查询不是为此而设计的,因此失败了。这是我的疏忽。
【讨论】:
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