云数据库 GAUSSDB-密态函数和操作符:示例

时间:2024-01-23 20:08:51

示例

byteawithoutorderwithequalcolin、byteawithoutorderwithequalcolout等密态等值函数为数据库内核中数据类型byteawithoutorderwithequalcol指定的in、out、send、recv等读写格式转换函数,具体可参考bytea类型的byteain、byteaout等函数,但会对本地的cek进行验证,需要密文字段中有本地存在的cekoid才能执行成功。

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-- 例如存在加密表int_type,int_col2为其加密列

-- 使用非密态客户端连接数据库,查询加密列密文
gaussdb=# select int_col2 from int_type;
                                                                       int_col2
------------------------------------------------------------------------------------------------------------------------------------------------------
 \x01c35301bf421c8edf38c34704bcc82838742917778ccb402a1b7452ad4a6ac7371acc0ac33100000035fe3424919854c86194f1aa5bb4e1ca656e8fc6d05324a1419b69f488bdc3c6
(1 row)

-- 将加密列密文当做byteawithoutorderwithequalcolin入参,格式从cstring输入转码转化成内部byteawithoutorderwithequalcol形式
gaussdb=# select byteawithoutorderwithequalcolin('\x01c35301bf421c8edf38c34704bcc82838742917778ccb402a1b7452ad4a6ac7371acc0ac33100000035fe3424919854c86194f1aa5bb4e1ca656e8fc6d05324a1419b69f488bdc3c6');
                                                           byteawithoutorderwithequalcolin
------------------------------------------------------------------------------------------------------------------------------------------------------
 \x01c35301bf421c8edf38c34704bcc82838742917778ccb402a1b7452ad4a6ac7371acc0ac33100000035fe3424919854c86194f1aa5bb4e1ca656e8fc6d05324a1419b69f488bdc3c6
(1 row)       

由于byteawithoutorderwithequalcolin等的实现会对cek进行查找,并且判断是否为正常加密后的数据类型。

因此如果用户输入数据的格式不是加密后的数据格式,并且在本地不存在对应cek的情况下,会返回错误。

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gaussdb=# SELECT * FROM byteawithoutorderwithequalcolsend('\x907219912381298461289346129'::byteawithoutorderwithequalcol);
ERROR:  cek with OID 596711794 not found
LINE 1: SELECT * FROM byteawithoutorderwithequalcolsend('\x907219912...
                                                        ^
gaussdb=# SELECT * FROM byteawithoutordercolout('\x90721901999999999999912381298461289346129');
ERROR:  cek with OID 2566986098 not found
LINE 1: SELECT * FROM byteawithoutordercolout('\x9072190199999999999...
   
SELECT * FROM byteawithoutorderwithequalcolrecv('\x90721901999999999999912381298461289346129'::byteawithoutorderwithequalcol);
ERROR:  cek with OID 2566986098 not found
                                           ^
gaussdb=# SELECT * FROM byteawithoutorderwithequalcolsend('\x90721901999999999999912381298461289346129'::byteawithoutorderwithequalcol);
ERROR:  cek with OID 2566986098 not found
LINE 1: SELECT * FROM byteawithoutorderwithequalcolsend('\x907219019...
                                                        ^
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