【发布时间】：2014-09-02 20:30:40
【问题描述】：
我正在尝试从我的 Java 中的 MS Access 数据库中提取一些值。我在以下查询中遇到困难 -
PreparedStatement p = c.prepareStatement("select GroupMembers from group_data where GroupName = ? and GroupOwnerID = ?");
p.setString(1,gsel);
p.setInt(2,empid);
它给了我一个错误 - 预期的参数太少 3
但是当我使用 -
PreparedStatement p = c.prepareStatement("select GroupMembers from group_data where GroupName = ?");
p.setString(1,gsel);
效果很好。
我的表架构是：
GroupName GroupMembers GroupOwnerID
text text number
第一个查询有什么问题？
这是堆栈跟踪
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Too few paramet
ers. Expected 3.
at sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6964)
at sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:7121)
at sun.jdbc.odbc.JdbcOdbc.SQLExecute(JdbcOdbc.java:3156)
at sun.jdbc.odbc.JdbcOdbcPreparedStatement.execute(JdbcOdbcPreparedState
ment.java:215)
at sun.jdbc.odbc.JdbcOdbcPreparedStatement.executeQuery(JdbcOdbcPrepared
Statement.java:90)
at ntpc.Sms$1$4$3.actionPerformed(Sms.java:743)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:20
18)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.jav
a:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel
.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259
)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonL
istener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832
)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDo
main.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDo
main.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:708)
at java.awt.EventQueue$4.run(EventQueue.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDo
main.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre
ad.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.
java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
【问题讨论】：
-
使用
p.setString(1,1); p.setInt(2,1);有意义吗？我想知道empid或gsel是否为空 -
不，它们不为空...我想根据两个约束获得结果集...
-
能否请您添加整个 Stacktrace 以及更多代码（执行语句并获取返回参数）？
-
我添加了堆栈跟踪
-
问题是我无法根据两个条件获取值