5

所以我试图从数据库中检索数据。可能是我看多了，还是没找到问题所在。

连接很好，语句很好（适用于静态数据），并且来自Item对象的数据是正确的。

它告诉我该语句没有输入参数。方法中抛出异常getSelectPrepareStatement()。代码是：

 public Result[] getItemsFromInput(Item item) throws SQLException {
    PreparedStatement statement;
    ArrayList<Result> results = new ArrayList<Result>();
    String query =  "SELECT Code1, Name, A.Code2 " +
                    "FROM ItemTable A " +
                    "INNER JOIN CategoryTable B " +
                    "ON A.CatCode = B.CatCode" +
                    "AND B.ID LIKE '?'";
    statement = getSelectPrepareStatement(query, item.getTail().getId()+"%");

    ...

    rs = queryForResultSet(statement);

    while(rs.next()) {
        results.add(new Result(
                rs.getString("ItemName"),
                rs.getInt("ItemCode"),
                rs.getString("ClassCode")));
    }

    return results.toArray(new Result[results.size()]);
}

在此处检索具有设置值的 PreparedStatement：

private PreparedStatement getSelectPrepareStatement(String SQL, String data) throws SQLException {
    PreparedStatement pStmt = conn.prepareStatement(SQL);
    pStmt.setString(1, data);

    return pStmt;
}

pStmt.setString(1, data);尽管我将语句设置为具有参数，但调用时会引发异常。

错误是：

    java.sql.SQLException: No input parameters.
        at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedResultSet.noStateChangeException(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedPreparedStatement.setString(Unknown Source)
        at connection.Communicator.getSelectPrepareStatement(Communicator.java:306)
        at connection.Communicator.getItemsFromInput(Communicator.java:56)
        at frame.PromotionsDialog$1.propertyChange(PromotionsDialog.java:126)
        at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:328)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:303)
        at java.awt.Component.firePropertyChange(Component.java:8402)
        at javax.swing.JComponent.firePropertyChange(JComponent.java:4494)
        at frame.DataPanel$1.actionPerformed(DataPanel.java:130)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
        at java.awt.Component.processMouseEvent(Component.java:6505)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
        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:729)
        at java.awt.EventQueue.access$200(EventQueue.java:103)
        at java.awt.EventQueue$3.run(EventQueue.java:688)
        at java.awt.EventQueue$3.run(EventQueue.java:686)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
        at java.awt.EventQueue$4.run(EventQueue.java:702)
        at java.awt.EventQueue$4.run(EventQueue.java:700)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.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)
    Caused by: java.sql.SQLException: No input parameters.
        at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
        ... 51 more
    Caused by: ERROR 07009: No input parameters.
        at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
        at org.apache.derby.impl.sql.GenericParameterValueSet.checkPosition(Unknown Source)
        at org.apache.derby.impl.sql.GenericParameterValueSet.getParameterForSet(Unknown Source)
        ... 47 more
4

3 回答 3

8

这是您的 SQL 中的问题。

AND B.ID LIKE '?'

这不是添加参数 - 这是指定的值?，因为它在引号中。基本上，你是说你想找到一个B.ID有单个问号的行。

你要：

AND B.ID LIKE ?

这样你就真正指定了一个参数。

于 2013-04-19T10:11:23.967 回答
4

不需要单引号?

尝试

String query =  "SELECT Code1, Name, A.Code2 " +
                    "FROM ItemTable A " +
                    "INNER JOIN CategoryTable B " +
                    "ON A.CatCode = B.CatCode" +
                    "AND B.ID LIKE ?%";
    statement = getSelectPrepareStatement(query, item.getTail().getId()+"");
于 2013-04-19T10:13:48.330 回答
1

尝试从 bind 参数周围删除单引号。这就是 PreparedStatement 为您所做的。

String query =  "SELECT Code1, Name, A.Code2 " +
                "FROM ItemTable A " +
                "INNER JOIN CategoryTable B " +
                "ON A.CatCode = B.CatCode" +
                "AND B.ID LIKE ?";
于 2013-04-19T10:12:21.940 回答