有没有办法确定哪些列是JDBC中的SQL聚合函数的结果？

Question

说我有一个SQL语句：

SELECT airport, COUNT(1) as ct FROM airports GROUP BY 1

有没有办法从JDBC getMetaData确定哪些列在GROUP BY

query = 'SELECT airport, COUNT(1) as ct FROM airports GROUP BY 1'
var rs = stmt.executeQuery(query);
var curRow = rs.getMetaData();

Answer 1

我在发布后不久就想到了这一点，这可能并不总是有效，但它对我的用例很好。我使用了列的表名并测试了它是否是＆gt; 0

query = 'SELECT airport, COUNT(1) as ct FROM airports GROUP BY 1'
var rs = stmt.executeQuery(query);
var curRow = rs.getMetaData();
console.log('getColumnName', curRow.getColumnName(2))
console.log('getColumnLabel', curRow.getColumnLabel(2))
var tabName = curRow.getTableName(2)
console.log('tabName.length', tabName.length)
if (tabName.length > 0) {
  console.log('tabName is legit', tabName)
} else {
  console.log('tabName is not legit', tabName)
}