java - 如何在Java中使用准备好的语句和StringBuffer返回row_number

Question

我想要返回 row_number 按变量模型类:

而示例中的PreparedStatament是我探索的，rferencia是列名称。 row_number 不是表的 native 列或物理列。如何使 dete 方法的值像实际的物理表列一样返回。在表中创建一个新列来存储这些值也没有什么意义。我也不打算使用触发器来返回这些值。可以这样完成，下面的代码不会出现错误。

final StringBuffer lSql = new StringBuffer();
lSql.append("SELECT ");
lSql.append("   TABLE_NAME.ROW_NUMBER() OVER (ORDER BY COLUMN_DAY) ");
lSql.append("FROM ...");
// ...
final List<classModel> listData = new ArrayList<classModel>();
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rset = null;
try{
 conn = getConnection1();
 stmt = conn.prepareStatement(lSql.toString()); 
 int count = 1;
 //stmt.setLong(count++,      classModelParameterThisFunctionDAO.getVarColumnSequence());
 //...
 rset = stmt.executeQuery(); // ERROR THIS LINE NI DEBUG
 while(rset.nex()){
  final classModel lClassModel = new classModel();
  lClassModel.setColumnSequence(rset.getInt("ROW_NUMBER() OVER (ORDER BY COLUMN_DAY)")); //error in this line
  listData.add(lClassModel);

Answer 1

lSql.append("SELECT ");
lSql.append("   TABLE_NAME.ROW_NUMBER() OVER (ORDER BY COLUMN_DAY) as RRN ");
lSql.append("FROM ...")
.
.
.
lClassModel.setColumnSequence(rset.getInt("RRN"));