Question

在cassandra-jdbc驱动程序中使用CQL语法.... 这不起作用，只是得到空字符串：

      PreparedStatement pstmt = conn.prepareStatement("select * from myCF");
      ResultSet rset = pstmt.executeQuery();
      ResultSetMetaData rsmd = rset.getMetaData();
      int cols = rsmd.getColumnCount();
      pset.next();
      print rsmd.getColumnName(0);
      print pset.getString(0);
      ...

显然我必须每行使用打开或类似的东西...... 如果您不知道列名，请发布完整示例。

Answer 1

好的，这是有用的：

    ResultSet res = pstmt.executeQuery();
    CassandraResultSet crs = res.unwrap(CassandraResultSet.class);
    crs.next() ;
    ResultSetMetaData rsmd = crs.getMetaData();
        cols = rsmd.getColumnCount();
        for(int i=1 ; i <= cols ; i++) {
          String colNm = rsmd.getColumnName(i);
          String colVal = null;
          String colType = rsmd.getColumnTypeName(i);
          if (colType.equals("JdbcLong")) {
              colVal = "" + crs.getLong(i);
          } else if (colType.equals("JdbcInteger")) {
              colVal = "" + crs.getInt(i);
          } else {
              colVal = crs.getString(i);

请注意，为了正确显示键，列名和值，我必须定义如下的列族：

NOTE: you wont be able to understand your column names and values unless
you set the Cassandra Type hints via cassandra-cli.  To have a schema like below
where all un-referenced column types are UTF8Type:
   CREATE COLUMN FAMILY  MyColFam  WITH key_validation_class=UTF8Type
     AND default_validation_class=UTF8Type AND comparator=UTF8Type
     AND column_metadata = [ 
          {column_name: an_integer_column, validation_class: IntegerType}
         {column_name: a_long_column,     validation_class: LongType}
     ];

如何从cassandra-jdbc ResultSet获取列名？

1 个答案: