使用JAVA addBatch（）和executeBatch（）时，会收到错误消息

我试图将屏幕上的行项目数据添加到derby db表中。行项目是包含3个字段（列）的行

我尝试使用

addBatch（）

，但得到空错误。没有

addBatch（）

，我就不会出错。因此，我改为

executeUpdate（）

方法。问题是，现在我在数据库中得到了相同内容的重复条目（最多2页）。它还将空行项目行发布到数据库中。我尝试使用if语句，但该方法忽略了它们。这是密码。我做错了什么？我在日常工作中使用这个软件程序，所以我确实需要解决这个问题。求你了

public void updatePROPOSAL() throws SQLException{

    //Connection conn =null;
 //   conn.setAutoCommit(false);
   // DecimalFormat dc = new DecimalFormat("#,###.00");

    String addSQL2 = "INSERT INTO MATERIALTBL (MATLINEITEM, 
    MATLINEITEMCOST, "
    + "MATLINEITEMQTY, MATMOSS, MATCRM)"
    + "VALUES (?,?,?,?,?)";
        PreparedStatement pst = null;
       try { 



        conn = DriverManager.getConnection("jdbc:derby:proposaldb");

       int tubes = jtxtfld_TUBES.getText().length();
        System.out.println(tubes);
        if(tubes != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_TUBES.getText());
        pst.setString(2, jlbl_TUBES_COST.getText());
        pst.setString(3, jtxtfld_TUBES_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
       }


       int coup = jtxtfld_COUP.getText().length();
        System.out.println(coup);
       if (coup != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_COUP.getText());
        pst.setString(2, jlbl_COUP_COST.getText());
        pst.setString(3, jtxtfld_COUP_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
         }

        int cmtrs = jtxtfld_CMTRS.getText().length();
         System.out.println(cmtrs);
        if(cmtrs != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_CMTRS.getText());
        pst.setString(2, jlbl_CMTRS_COST.getText());
        pst.setString(3, jtxtfld_CMTRS_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
       }

        int spaceone = jtxtfld_spaceONE.getText().length();
         System.out.println(spaceone);
       if (spaceone != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_spaceONE.getText());
        pst.setString(2, jlbl_spaceONE_COST.getText());
        pst.setString(3, jtxtfld_spaceONE_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
       }

        int hmtrs = jtxtfld_HMTRS.getText().length();
         System.out.println(hmtrs);
        if (hmtrs != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_HMTRS.getText());
        pst.setString(2, jlbl_HMTRS_COST.getText());
        pst.setString(3, jtxtfld_HMTRS_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
        }

        int spacetwo = jtxtfld_spaceTWO.getText().length();
         System.out.println(spacetwo);
        if(spacetwo != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_spaceTWO.getText());
        pst.setString(2, jlbl_spaceTWO_COST.getText());
        pst.setString(3, jtxtfld_spaceTWO_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
        }

        int gmtrs = jtxtfld_GMTRS.getText().length();
         System.out.println(gmtrs);
        if (gmtrs != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_GMTRS.getText());
        pst.setString(2, jlbl_GMTRS_COST.getText());
        pst.setString(3, jtxtfld_GMTRS_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
        }

        int spacethree = jtxtfld_spaceTHREE.getText().length();
         System.out.println(spacethree);
        if (spacethree != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_spaceTHREE.getText());
        pst.setString(2, jlbl_spaceTHREE_COST.getText());
        pst.setString(3, jtxtfld_spaceTHREE_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
        }


        int emtrs = jtxtfld_EMTRS.getText().length();
         System.out.println(emtrs);
        if (emtrs != 0) {
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_EMTRS.getText());
        pst.setString(2, jtxtfld_EMTRS_COST.getText());
        pst.setString(3, jtxtfld_EMTRS_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
        }

        int spacefour = jtxtfld_spaceFOUR.getText().length();
         System.out.println(spacefour);
        if (spacefour != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_spaceFOUR.getText());
        pst.setString(2, jtxtfld_spaceFOUR_COST.getText());
        pst.setString(3, jtxtfld_spaceFOUR_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
       }

       int count = jtxtfld_COUNT.getText().length();
        System.out.println(count);
       if (count != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_COUNT.getText());
        pst.setString(2, jlbl_COUNT_COST.getText());
        pst.setString(3, jtxtfld_COUNT_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
      }

        int xmtrs = jtxtfld_XMTRS.getText().length();
         System.out.println(xmtrs);
        if (xmtrs != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_XMTRS.getText());
        pst.setString(2, jlbl_XMTRS_COST.getText());
        pst.setString(3, jtxtfld_XMTRS_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
        }

        int rptrs = jtxtfld_RPTRS.getText().length();
         System.out.println(rptrs);
        if (rptrs != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_RPTRS.getText());
        pst.setString(2, jlbl_RPTRS_COST.getText());
        pst.setString(3, jtxtfld_RPTRS_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
       }

        int rcvrs = jtxtfld_RCVRS.getText().length();
        System.out.println(rcvrs);
        if (rcvrs != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_RCVRS.getText());
        pst.setString(2, jlbl_RCVRS_COST.getText());
        pst.setString(3, jtxtfld_RCVRS_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
         }


        int coll = jtxtfld_COLL.getText().length();
        System.out.println(coll);
        if (coll != 0){
        pst = conn.prepareStatement(addSQL2);
        pst.setString(1, jtxtfld_COLL.getText());
        pst.setString(2, jlbl_COLL_COST.getText());
        pst.setString(3, jtxtfld_COLL_QTY.getText());
        pst.setString(4, null);
        pst.setString(5, newCRM2);
        pst.executeUpdate(addSQL2);
         }


        //conn.commit();



    }catch (SQLException e){}


   }

---

我想使用

addBatch（）

方法，但它在Netbeans 8.0.2中似乎不起作用。如果您能以任何方式指导我，我将不胜感激。

您应该调用

executeUpdate（）

，不带任何参数。由于您没有提供NPE或显示任何抛出NPE的代码，因此您的

addBatch（）

问题无法得到帮助。永远不要忽视例外。事实上，对于那些没有实现的人来说，它居然能起作用，这是令人惊讶的？SQL中的标记。真的吗？嗯，它确实有用。有5个db条目和5个“？”-无未完成项。它没有做的是它没有效率。在第一次扫描到数据库后，条目将再次过帐。我只想把它插入一次，所以这不是真正的代码。而您实际询问的

addBatch（）

代码在哪里？您收到的错误消息是什么？user207421：感谢您花时间查看此消息。提交的代码就是我正在使用的代码。为什么？因为我无法让addBatch（）工作，所以我将它改为“executeUpdate”。但是，它现在会向数据库插入多个副本。我希望能够在db中只插入表单中有条目的行。编码也会插入空行。我接受了您的建议，并从executeUpdate（）中删除了参数。

 Solved the autobatch() problem. Had two problems. The null exception was because the 
 database wasn't being connected. The second problem was that I had too many repeats 
 of the pst statement. The empty spaces was an issue but I used the length of each 
 first column --if the length was more than zero then the line was added to the 
 database. 

  private void UpdateRecordTablePROPOSALMAT() throws SQLException, ParseException{
          Connection conn ;
          try {

           conn = DriverManager.getConnection("jdbc:derby:proposaldb");
          newCRM = jtxtfldCRM.getText();
         String  addSQL2 = "INSERT INTO MATERIALTBL (MATLINEITEM, MATLINEITEMCOST, "
         + "MATLINEITEMQTY, MATMOSS, MATCRM)"
         + "VALUES (?,?,?,?,?)";

        PreparedStatement psts = conn.prepareStatement(addSQL2);

        int tubes = String.valueOf(AMT7A).length();

        if(tubes != 0){
        psts.setString(1, String.valueOf(AMT7A));//Couplings Name
        psts.setString(2, String.format("%.2f", AMT8A));//Couplings Cost
        psts.setString(3, String.format("%.2f",AMT9A));//Couplings QTY
        psts.setString(4, null);
        psts.setString(5, newCRM);
        psts.addBatch();
       }

        int coup = String.valueOf(AMT10A).length();

        if(coup != 0){
        psts.setString(1, String.valueOf(AMT10A));//Couplings Name
        psts.setString(2, String.format("%.2f",AMT11A));//Couplings Cost
        psts.setString(3, String.format("%.2f",AMT12A));//Couplings QTY
        psts.setString(4, null);
        psts.setString(5, newCRM);
        psts.addBatch();
       }

        int cmtrs = String.valueOf(AMT13A).length();

        if(cmtrs != 0){

        psts.setString(1, String.valueOf(AMT13A));//Cold Water Meters Name
        psts.setString(2, String.format("%.2f",AMT14A));//Cold Water Meters Cost
        psts.setString(3, String.format("%.2f",AMT15A));//Cold Water Meters QTY
        psts.setString(4, null);
        psts.setString(5, newCRM);
        psts.addBatch();
       }

    [  continue with more addBatch line items ]


          int[] affectedRecords = psts.executeBatch();        

          }finally {
        PreparedStatement psts =null;         
   if(psts != null) {   }
      }
     }