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Status Functionality already exists
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on Nov 10, 2023

RELATED IDEAS

Add a warning when parameter markers are truncated

IBM i silently truncates parameters to prepared statements to match the length of the target. 
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From https://www.ibm.com/docs/en/i/7.4?topic=statements-open, section "Parameter marker replacement" :
However, unlike the rules for assigning a value to a column:
- If V is a string, the value will be truncated (without an error), if its length is greater than the length attribute of the target.
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Example: If field "X" is a CHAR(5), in a prepared statement with clause "WHERE X = ?", the string parameter passed in is silently truncated to length 5 if it is longer than 5 characters. This means that a parameter value of "ABCDEF" will match to a field value of "ABCDE" as the parameter value is truncated. This is not how other database platforms handle this, and has caused issues because our developers do not expect this behavior on Db2 for i, resulting in rows that match a WHERE clause unexpectedly.

We would like an SQL query option (ideally settable through either ODBC/JDBC connection string or QAQQINI) that would cause an SQL warning or error when the passed parameter value is truncated.

Idea priority Medium
  • Guest
    Reply
    |     Dec 13, 2023
    IBM believes that the solution for the Idea described is already available.

    When a parameter marker value is truncated on the OPEN, a warning is issued with SQLSTATE 01004. This follows the rules defined by the SQL standard.

    The documentation for the SQL OPEN statement will be corrected to reflect the existing behavior. This will happen when it is refreshed in the spring of 2024.
    The new sentence will read:
    If V is a string, the value will be truncated with a warning (SQLSTATE 01004) if its length is greater than the length attribute of the target.

    Db2 for i development team
    IBM Power Systems Development

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