获取错误：java.sql.SQLException：结果集开始之前

我有一个函数add_data到数据库mysql，但我越来越errr：java.sql.SQLException：结果集开始之前。这是我的代码：获取错误：java.sql.SQLException：结果集开始之前

public void tambah() { 
     Connection con = Koneksi.getkoneksi(); 
     int kodeBarcode = Integer.valueOf(TxtBarang.getText()); 
     String kodeTransaksi = kodetransaksi.getText(); 
     int quantity = Integer.valueOf(TxtJbeli.getText()); 
     String tanggal_transaksi = tanggal.getText(); 
     Integer harga_barang = Integer.valueOf(TxtHargaBarang.getText()); 
     Integer total_harga = harga_barang * quantity; 
     try { 
      Statement st = con.createStatement(); 
      String sql = "select idtransaksi from tbtransaksi where idtransaksi='" + kodeTransaksi + "'"; 
      ResultSet rs = st.executeQuery(sql); 

      // get idbarang 
      Statement st_barang = con.createStatement(); 
      ResultSet rs_barang = st_barang.executeQuery("select idbarang from tbstok where idstok='26'"); 
      Integer idbarang = rs_barang.getInt("idbarang"); 
      // cek apa sudah ada di tabel transaksi 
      if (rs.next()) { // jika sudah ada 
       Statement st2 = con.createStatement(); 
       // cek apakah ada diskon 
       ResultSet rs2 = st2.executeQuery("select idstok, idbarang, warna, ukuran, stok1, harga, harga_d from tbstok where idstok='" + kodeBarcode + "'"); 
       if (rs2.next() && rs2.getInt("harga_d") == 0) { // jika tidak ada diskon 
        Statement st4 = con.createStatement(); 
        st4.executeUpdate("INSERT INTO `tbdetail`(`iddetail`, `idtransaksi`, `tgl_transaksi`, `idbarang`, `idstok`, `jumlah`, `total`) VALUES ('', '" + kodeTransaksi + "', '" + tanggal_transaksi + "', '" + idbarang + "', '" + kodeBarcode + "', '" + quantity + "', '" + total_harga + "')"); 
       } else { // jika ada diskon 
        Statement st4 = con.createStatement(); 
        st4.executeUpdate("INSERT INTO `tbdetail`(`iddetail`, `idtransaksi`, `tgl_transaksi`, `idbarang`, `idstok`, `jumlah`, `total`) VALUES ('', '" + kodeTransaksi + "', '" + tanggal_transaksi + "', '" + idbarang + "', '" + kodeBarcode + "', '" + quantity + "', '" + total_harga + "')"); 
       } 
      } else { // jika belum ada 
       Statement st2 = con.createStatement(); 
       // cek apakah ada diskon   
       ResultSet rs2 = st2.executeQuery("select idstok, idbarang, warna, ukuran, stok1, harga, harga_d from tbstok where idstok='26'"); 
       if (rs2.next() && rs2.getInt("harga_d") == 0) { // jika tidak ada diskon 
        // insert ke tabel transaksi dan tabel detail 
        Statement st3 = con.createStatement(); 
        st3.executeUpdate("INSERT INTO `tbtransaksi`(`idtransaksi`, `iduser`, `totalbayar`, `status`, `dibaca`, `tgl_transaksi`) values ('" + kodeTransaksi + "','0','0','proses','N','" + tanggal_transaksi + "')"); 
        Statement st4 = con.createStatement(); 
        st4.executeUpdate("INSERT INTO `tbdetail`(`iddetail`, `idtransaksi`, `tgl_transaksi`, `idbarang`, `idstok`, `jumlah`, `total`) VALUES ('', '" + kodeTransaksi + "', '" + tanggal_transaksi + "', '" + idbarang + "', '" + kodeBarcode + "', '" + quantity + "', '" + total_harga + "')"); 
       } 
       if (rs2.next() && rs2.getInt("harga_d") != 0) { // jika ada diskon 
        // insert ke tabel transaksi dan tabel detail      
        Statement st3 = con.createStatement(); 
        st3.executeUpdate("INSERT INTO `tbtransaksi`(`idtransaksi`, `iduser`, `totalbayar`, `status`, `dibaca`, `tgl_transaksi`) values ('" + kodeTransaksi + "','0','0','proses','N','" + tanggal_transaksi + "')"); 
        Statement st4 = con.createStatement(); 
        st4.executeUpdate("INSERT INTO `tbdetail`(`iddetail`, `idtransaksi`, `tgl_transaksi`, `idbarang`, `idstok`, `jumlah`, `total`) VALUES ('', '" + kodeTransaksi + "', '" + tanggal_transaksi + "', '" + idbarang + "', '" + kodeBarcode + "', '" + quantity + "', '" + total_harga + "')"); 
       } 
      } 


     } catch (SQLException ex) { 
      System.out.println(ex); 
     } 

    }

我是新的使用java。所以需要你的帮助。非常感谢您

功能获取连接：

public static Connection getkoneksi() { 
     if (koneksi==null) { 
      try { 
       String url=new String(); 
       String user=new String(); 
       String password=new String(); 
       url="jdbc:mysql://localhost:3306/shafa"; 
       user="root"; 
       password=""; 
       DriverManager.registerDriver(new com.mysql.jdbc.Driver()); 
       koneksi=DriverManager.getConnection(url,user,password); 
       System.out.println("koneksi sukses"); 
      }catch (SQLException t) { 
       System.out.println("Error membuat koneksi"); 
      } 
     } 
    return koneksi; 
    }

来源

2016-02-05 Ruslan Wahyudi

whichline给出错误？并发布getkoneksi（）方法 – Abdelhak

@Abdelhak：没有针对错误的特定行。我的方法getkoneksi（）已经发布。 –

你要叫rs_barang.next()Integer idbarang = rs_barang.getInt("idbarang");之前将corsor设置到结果集的第一行。

 ResultSet rs_barang = st_barang.executeQuery("select idbarang from tbstok where idstok='26'"); 
     rs_barang.next(); 
     Integer idbarang = rs_barang.getInt("idbarang");

了解准备好的陈述。

来源

2016-02-05 07:15:13 Jens

是的，我有，并没有像以前那样得到错误。但仍然无法将数据插入数据库。 –

@RuslanWahyudi尝试使用调试器来查看发生了什么 – Jens

获取错误：java.sql.SQLException：结果集开始之前

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