使用 JDBC 获取多个结果集不起作用 [重复]

Question

我应该从第三方 SQL Server 数据库调用存储过程（拥有只读权限）。 此外，当我尝试在 DataGrip 中执行此过程时：

EXEC Web.example_procedure 2, 3, 4

我收到了两个结果：

冷杉：

<anonymous>
-----------
3

秒：

column_1 | column_2
------------------
   k1    |   v1
   k2    |   v2
   k3    |   v3
...

我需要第二张桌子。

由于这个article，现在我正在做下一个

private static void executeStatement(Connection con) {
    try {
        String SQL = "EXEC Web.example_procedure 2, 3, 4";
        Statement stmt = con.createStatement();
        boolean results = stmt.execute(SQL);
        int rsCount = 0;

        //Loop through the available result sets.
        do {
            if (results) {
                ResultSet rs = stmt.getResultSet();
                rsCount++;

                //Show data from the result set.
                System.out.println("RESULT SET #" + rsCount);
                while (rs.next()) {
                    // something will be here
                }
                rs.close();
            }
            results = stmt.getMoreResults();
        } while (results);
        stmt.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

输出是：

RESULT SET #1

换句话说，我只得到第一个结果。 如何获得第二张桌子？

• 我可以修改 SQL 查询吗？ （这将只返回一张桌子而没有 第一个 int 结果）
• JDBC？
• 休眠？

我会很高兴任何工作变体。

更新

感谢@MarkRotteveel 和他的answer - 我解决了这个问题

String sql = "EXEC Web.example_procedure 2, 3, 4";
PreparedStatement stmt = con.prepareStatement(sql);

boolean result = stmt.execute();

while (true) {
    if (result) {
        ResultSet rs = stmt.getResultSet();

        // in my case first table has only one column, 
        // and I need the second table, which has 9 columns
        if (rs.getMetaData().getColumnCount() > 1) {

            // go through the rows
            while (rs.next()) {

                // for example what we can do
                rs.getMetaData().getColumnCount(); // return column count in the current result set
                rs.getObject(int columnIndex); // get value for column index. Must be not greater than .getColumnCount()
            }
        }

    } else {
        int updateCount = stmt.getUpdateCount();
        if (updateCount == -1) {
            // no more results
            break;
        }
    }
    result = stmt.getMoreResults();
}

Answer 1

使用 JDBC CallableStatement：

cstmt.registerOutParameter()
cstmt.getObject()

  String sql = "{call getEmpName (?, ?)}";
  cstmt = conn.prepareCall(sql);

  //Bind IN parameter first, then bind OUT parameter
  int empID = 102;
  cstmt.setInt(1, empID); // This would set ID as 102
  // Because second parameter is OUT so register it
  cstmt.registerOutParameter(2, OracleTypes.CURSOR);

  //Use execute method to run stored procedure.
  System.out.println("Executing stored procedure..." );
  cstmt.execute();

  //Retrieve data
  rs = (ResultSet) cstmt.getObject(1);

https://docs.oracle.com/cd/E17952_01/connector-j-en/connector-j-usagenotes-statements-callable.html

Answer 2

您可以将结果集设置为可更新以执行多个命令。

Statement stmt = conn1.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

        String insert1="insert into data values('******','*********')";
        String insert2="insert into data values('*******','******')";
        conn1.setAutoCommit(false);

        ResultSet rs = stmt.executeQuery("select * from data");
        rs.last();