Tag: select

ResultSet关闭后不允许操作

好吧，在过去的两天里，我一直试图解决这个问题。 Statement statement = con.createStatement(); String query = “SELECT * FROM sell”; ResultSet rs = query(query); while (rs.next()){//<— I get there operation error here 这是查询方法。 public static ResultSet query(String s) throws SQLException { try { if (s.toLowerCase().startsWith(“select”)) { if(stm == null) { createConnection(); } ResultSet rs = stm.executeQuery(s); return rs; } else { if(stm == […]

在Mysql中区分大小写使用select where Query

嗨，我正在使用Java前端和Mysql后端,,, 实际上在tbl_test中包含 name value ————— abc 22 xyz 14 ABC 32 xyZ 4 ABc 4 在java中我尝试检索abc的值，因此编写了一个代码 ResultSet result=stmt.executeQuery(“select value from tbl_test where name=’abc'”); while(result.next()) { System.out.println(“Answer : “+result.getInt(1)); } result.close(); 目前的输出是 Answer : 22 Answer : 32 Answer : 4 其实我只希望结果’abc’即答案：22 我也找到了结果，代码如下 String name=”abc”; ResultSet result=stmt.executeQuery(“select name, value from tbl_test where name='”+name+”‘”); while(result.next()) { if(name.equals(result.getString(1)) […]

无法弄明白如何

试图获取公司列表，但它给了我一个错误。 type Exception report message tag ‘select’, field ‘list’, name ‘workOrder.company’: The requested list key ‘listAllCompanys’ could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} – [unknown location] description The server encountered an internal error that prevented it from fulfilling this request. 例外： org.apache.jasper.JasperException: tag ‘select’, field ‘list’, name ‘workOrder.company’: The requested […]