Question

有没有办法通过jdbc使Impala上的元数据无效？

我尝试了以下内容（我使用的是Cloudera_ImpalaJDBC4_2.5.5.1007驱动程序）：

            // invalidate metadata and rebuild index on Impala 
            try {
                Statement stmt = impalaConn.createStatement();
                try {
                    String query = "INVALIDATE METADATA;";
                    ResultSet resultSet = stmt.executeQuery(query);
                    while (resultSet.next()) {
                        // do something
                    }
                }                
                finally {
                    stmt.close();
                }
            }
            catch(SQLException ex) {
                while (ex != null)
                {
                    ex.printStackTrace();
                    ex = ex.getNextException();
                }
                System.exit(1);
            }

但我得到以下例外：

java.sql.SQLDataException: [Simba][JDBC](11300) A ResultSet was expected but not generated from query "INVALIDATE METADATA;". Query not executed.
        at com.cloudera.impala.exceptions.ExceptionConverter.toSQLException(ExceptionConverter.java:136)
        at com.cloudera.impala.jdbc.common.SStatement.checkCondition(SStatement.java:2274)
        at com.cloudera.impala.jdbc.common.SStatement.executeNoParams(SStatement.java:2704)
        at com.cloudera.impala.jdbc.common.SStatement.executeQuery(SStatement.java:880)
        at ico.az.deploy.TestSuite.testTeradata(TestSuite.java:103)
        at ico.az.deploy.TestSuite.run(TestSuite.java:310)
        at ico.az.deploy.TestSuite.main(TestSuite.java:345)

有什么想法吗？

Answer 1

是。该查询不会返回ResultSet。请改用Statement.executeUpdate(String)。正如JavaDoc所说，为了强调，添加了粗体，执行给定的SQL语句，该语句可以是INSERT，UPDATE或DELETE语句或不返回任何内容的SQL语句 。 / p>

stmt.executeUpdate(query);

Impala通过jdbc使元数据无效

1 个答案: