我使用 databasemetadata 来查找列大小。但是 getColumns(null,null,"table_name",null) 返回一个空结果集。我通过查询来检查该表并且该表存在。错误在哪里?提前致谢!
更新:
Connection connection = getConnection(); //getting the connection -
Statement st = connection.createStatement();
ResultSet rs = st.executeQuery("select * from table_name");
while (rs.next()) {
System.out.println(rs.getString("column_name")); //The values get printed
}
ResultSet rsColumns = null;
DatabaseMetaData meta = connection.getMetaData();
rsColumns = meta.getColumns(null, null, "table_name",null);
System.out.println(rsColumns.next()); // I get false here which means resultset is empty. But I dunno why.