我无法使用多个选择查询运行下面的代码。我可以单独运行下面的查询,但我想一起运行并将结果存储在ArrayList中。我得到的错误是java.sql.SQLException: ResultSet not open. Operation 'next' not permitted. Verify that autocommit is off.
有什么建议吗?或者有更好的方法吗?感谢
public ArrayList<String> getTotalCountBasicQueries() {
ArrayList<String> totalCount = new ArrayList();
Statement stmt = null;
stmt = conn.createStatement();
conn.setAutoCommit(false);
try {
String q1 = "select count query";
String q2 = "select count query2";
String q3 = "select count query3 ";
ResultSet rs = stmt.executeQuery(q1);
ResultSet rs2 = stmt.executeQuery(q2);
ResultSet rs3 = stmt.executeQuery(q3);
while (rs.next()) {
totalBasicCount.add(rs.getString(1));
}
while (rs2.next()) {
totalCount.add(rs2.getString(1));
}
while (rs3.next()) {
totalCount.add(rs3.getString(1));
}
rs.close();
rs2.close();
rs3.close();
stmt.close();
} catch (Throwable e) {
System.out.println("Table fetch failed or result data failed");
} finally {
if (stmt != null) {
try {
stmt.close();
System.out.println("Could not close query");
} catch (SQLException ex) {
System.out.println("Could not close query");
}
}
return totalBasicCount;
}
}
}
答案 0 :(得分:1)
请参阅ResultSet
的javadoc:
当Statement对象时,ResultSet对象自动关闭 生成它的是关闭,重新执行或用于检索下一个 由多个结果序列产生。
根据规范,您不能为唯一语句打开多个结果集。但是,有些jdbc驱动程序允许这个
尝试:
ResultSet rs = stmt.executeQuery(q1);
while (rs.next()) {
totalBasicCount.add(rs.getString(1));
}
ResultSet rs2 = stmt.executeQuery(q2);
while (rs2.next()) {
totalCount.add(rs2.getString(1));
}
ResultSet rs3 = stmt.executeQuery(q3);
while (rs3.next()) {
totalCount.add(rs3.getString(1));
}