Boa noite galera, tenho o seguinte método;
public void mostrarReserva() throws SQLException {
String sql = "select max(n_nfe) from nfe";
pst = conecta.prepareStatement(sql);
rs = pst.executeQuery();
String add1=rs.getString("max(n_nfe)");
txtMax.setText(add1);
}
Que no caso, gostaria de usar para retornar o maior valor da coluna “n_nfe” da tabela “nfe” no PostgreSQL. Porém, estou obtendo o seguinte erro:
mar 15, 2017 7:41:15 PM VISUAL.NFE.frmReserva jButton1ActionPerformed
GRAVE: null
org.postgresql.util.PSQLException: A nome da coluna max(n_nfe) não foi encontrado neste ResultSet.
at org.postgresql.jdbc.PgResultSet.findColumn(PgResultSet.java:2588)
at org.postgresql.jdbc.PgResultSet.getString(PgResultSet.java:2465)
at VISUAL.NFE.frmReserva.mostrarReserva(frmReserva.java:57)
at VISUAL.NFE.frmReserva.jButton1ActionPerformed(frmReserva.java:156)
at VISUAL.NFE.frmReserva.access$000(frmReserva.java:14)
at VISUAL.NFE.frmReserva$1.actionPerformed(frmReserva.java:80)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
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:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Alguém pode me dar uma luz?
