我正在尝试执行调用方法selectInAsending(...)的getPendingSalesOrderIDs()方法。
但是这显示了一个SQLException说 java.sql.SQLException:ResultSet关闭后不允许操作
这里db.endSelect()将关闭所有连接。我认为问题出在那里。
public ArrayList getPendingSalesOrderIDs() {
ArrayList a = new ArrayList();
try {
//ResultSet r = znAlSalesOrder.select("sono", "");
ResultSet r = salesOrder.selectInAsending("soNo", "productionStatus = 'pending' and formatID='Zn-Al'", "soNo");
r.beforeFirst();
while (r.next()) {
a.add(r.getString(1));
}
} catch (SQLException ex) {
}
return a;
}
public ResultSet selectInAsending(String fields,String selection, String orderField)
{
db = new Database();
db.select("SELECT "+fields+" FROM "+name+" WHERE "+selection + " ORDER BY " +orderField+ " ASC");
this.rs=db.rs;
db.endSelect();
return this.rs;
}
public void select(String query)
{
if(con!=null)
{
try {
System.out.println(query);
rs = stm.executeQuery(query);
} catch (SQLException ex) {
Logger.getLogger(Database.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
答案 0 :(得分:2)
如果db.endSelect()
关闭了ResultSet,为什么不将其删除(在selectInAsending()
方法中)?
您可以在getPendingSalesOrderIDs()
方法中关闭ResultSet,如下所示:
ResultSet r = null;
try {
ResultSet r = salesOrder.selectInAsending("soNo", "productionStatus = 'pending' and formatID='Zn-Al'", "soNo");
} catch (SQLException e) {
} finally {
if (r != null) {
try {
r.close();
} catch (SQLException e) {
}
}
}
答案 1 :(得分:1)
是的,问题出在db.endSelect()
来电。
只需返回结果集,然后确保在完成后调用rs.close()
。这将照顾清理。