原则2-IBM DB2

Question

I have problem while mapping DB2 Table with Doctrine 2. Application exists for a long time and for strange reason there was a "£" special char added in front of some columns names.

Ex : £ADRB1

While checking documentation, it appreared that this is something Doctrine does not like very much. By the way, connection is made through a ODBC driver :/ which I cannot change.

Entity column is configured this way :

/**
 * @ORM\Column(name = "`£ADRB1`", type="string", length=38, options={"default":""})
 */
protected $ADRB1;

Error is

SQLSTATE[HY090]: Invalid string or buffer length: 0 [IBM][System i Access ODBC Driver]Invalid string or buffer length. (SQLPrepare[0] at /patched-php-src-5.5.7/php-5.5.7/ext/pdo_odbc/odbc_driver.c:206)

While trying to fetch result with simple queryBuilder.

Is there any possibility to be able to get it work with Doctrine 2 ?

Many thanks !

Answer 1

I know nothing about Doctrine2, but if the origin for the issue has anything to do with the column name [ which seems at least somewhat tenuous given the error implies nothing about a column name ], then probably the issue is related to the name of the column [at what is presumably an IBM i as the server] having the first character defined using the EBCDIC code-point 0x5B.

While that EBCDIC code-point x'5B' is valid to represent the variant Dollar Sign character in some code pages [a valid but discouraged character, just like the @; see: Using @ on Variable Names ], the Pound Sterling Sign character [ASCII code-point 0xA3] sent from an ASCII client may not get translated to the EBCDIC code-point x'5B'. The outcome depends on how the server is configured for the Code Page, and quite likely the character would translate to the EBCDIC code-point 0xB1; a code-point that is unlikely to represent a valid character for an SQL identifier such as a column name.

So if the client can refer to the column name having specified the first character as the $ character instead of as the £ character, then when the expected\\proper character conversion from ASCII to EBCDIC occurs, the server will correctly see the column name as the expected name; ie will in effect , see the characters $ADRB1 in EBCDIC [hex:5BC1C4D9C2F1] as translated from the ASCII characters $ADRB1 [hex:2441445231] rather than the likely\\undesirable outcome instead whereby the server in effect will see the characters £ADRB1 in EBCDIC [hex:B1C1C4D9C2F1] as translated from the ASCII characters £ADRB1 [hex:A341445231].

ps The tag DB2i is defined in the wiki as the DB2 for IBM i and the tag DB2 is defined in the wiki as the DB2 family , but the tag ibm-db2 has no definition https://stackoverflow.com/tags/ibm-db2/info , so if the server is IBM i with the DB2 for i as the database, then perhaps the DB2i is a better [or additional] choice for tagging this topic.?