java - 无法从结果集中的数据库中获取所有数据

Question

我正在从数据库中获取所有数据并将结果集存储到列表中。但无法获取所有数据。我想将数据存储在下拉列表中。我的代码如下。

public static void updateChallan(){
    ChallanNumber pd=null;
    int i=0;
    String customerName="";
    List<ChallanNumber> challanList= new ArrayList<ChallanNumber>();
    Connection con = DB.getConnection();
    try
    {
    String st="select CHALLAN_NUMBER,CUSTOMER_CODE,CHALLAN_DATE from DELIVERY_CHALLAN_DETAILS order by CHALLAN_NUMBER";
    Statement stmt=con.createStatement();
    ResultSet rs=stmt.executeQuery(st);
    while(rs.next())
    {
        String stCustName="select CUSTOMER_NAME from CUSTOMER_DETAILS where CUSTOMER_CODE='"+rs.getString(2)+"'";
        Statement stmtCustName=con.createStatement();
        ResultSet rsCustName=stmtCustName.executeQuery(stCustName);
        while(rsCustName.next()){
            customerName=rsCustName.getString(1);
        }

        customerName=rsCustName.getString(1);
        //System.out.println(customerName +" "+i);
        pd=new ChallanNumber(rs.getString(1),customerName,rs.getString(3));
        challanList.add(i,pd);
        i++;
    }
    }
    catch(Exception e)
    {
        //e.printStackTrace();
    }
    render(challanList);
}

下拉代码如下。

<select name="challanNumber" id="challanNumber">
              <option value="selected" selected="selected">ChallanNumber-CustomerCode-    Date</option>

              #{list challanList, as:'cl'}

              <option value="${cl.challanNumber}">${cl.challanNumber}(${cl.customercode}-${cl.challanDate})</option>

                #{/list}



            </select>

Answer 1

问题在于，当您收到异常时，您未关闭Connection 和ResultSet。因此数据库已耗尽所有打开的游标。