【已解决】JAVA中JDBC读取doris bitamp的问题

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doris中一个bitmap里面包含小于2147483648（2的31次方）的INT数字，也包含大于2147483648 的LONG数字，在JDBC读取后转换为Roaring64NavigableMap会出现，大于2147483648的数字无法正常识别，丢失精度变成负数。

有没有JAVA中JDBC读取doris bitamp的正确示例

danger7
1 Answers

可以参考如下代码块：

 // Initialize connection
        try (Connection conn = DriverManager.getConnection(url, user, password);
             Statement stmt = conn.createStatement();
             ResultSet rs = stmt.executeQuery("SELECT bitmap_column FROM your_table WHERE conditions")) {
            
            // Iterate through the result set
            while (rs.next()) {
                // Retrieve the bitmap as a Base64 String
                String base64Bitmap = rs.getString("bitmap_column");
                
                // Convert the Base64 String to a Roaring64NavigableMap
                Roaring64NavigableMap bitmap = Roaring64NavigableMap.bitmapOf();
                // Assuming you have a method to convert base64 to Roaring64NavigableMap
                // This conversion method is not provided here and needs to be implemented
                // according to the specific details of your environment and requirements.
                bitmap = convertBase64ToRoaring64NavigableMap(base64Bitmap);

                // Now you can work with the bitmap
                // For example, print out the content
                System.out.println(bitmap.toString());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
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