[jira] Commented: (DERBY-1132) Truncation Error with Concat

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/DERBY-1132?page=comments#action_12450082 ] 
            
Knut Anders Hatlen commented on DERBY-1132:
-------------------------------------------

Here's another repro. It doesn't reproduce the the exception, but it could perhaps shed some more light on the magic number 15.

ij> values length(char('abc'));
1          
-----------
15         

1 row selected
ij> values length(char('abcdefghijklmnopqrstuvwxyz'));
1          
-----------
15         

1 row selected
ij> values length(varchar('abc'));
1          
-----------
3          

1 row selected
ij> values length(varchar('abcdefghijklmnopqrstuvwxyz'));
1          
-----------
15         

1 row selected

When a string is cast to char with no length specified, the length is always 15. When a string is cast to varchar with no length specified, the length is always min(length(string), 15).

> Truncation Error with Concat
> ----------------------------
>
>                 Key: DERBY-1132
>                 URL: http://issues.apache.org/jira/browse/DERBY-1132
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 10.1.1.0
>         Environment: Solaris, Windwos, JDK 1.5
>            Reporter: Mitesh Meswani
>         Assigned To: Saurabh Vyas
>         Attachments: repro.java
>
>
> Consider the table
> CREATE TABLE CUSTOMER_TABLE ( ID VARCHAR(255)   PRIMARY KEY NOT NULL, NAMEZ VARCHAR(255) , COUNTRY VARCHAR(255) )
> Sql:
> PreparedStatement ps = conn.prepateStatement ("SELECT * FROM CUSTOMER_TABLE WHERE NAMEZ  = VARCHAR ( CAST (? AS VARCHAR(32672) ) || CAST (? AS VARCHAR(32672) ) )" );
> ps.setString(1, "Alan E. ");
> ps.setString(2, "Frechette");
> ps.executeQuery()
> Error:
> "A truncation error was encountered trying to shrink VARCHAR 'Alan E. Frechette' to length 15."
> getErrorCode()-1
> getSQLState()22001 
> Please note that
> -The query executes ok against DB2 database
> -The query executes ok if the total length of both the parameters bound is less than 15. That is as follows
>    //Total length of parameters bound = len("Alan E. Fre") = 11
>    ps.setString(1, "Alan E. ");
>    ps.setString(2, "Fre");
> -The error occurs both with embedded and network mode of derby
> -Omitting the casts as follows also gives the same error
>    query: SELECT * FROM CUSTOMER_TABLE WHERE NAMEZ  = VARCHAR( 'Frechette' || ? )
>    error: SQLState: 22001 "A truncation error was encountered trying to shrink VARCHAR 'FrechetteAlan E. ' to length 15"
> -Using parameter markers for both the variables without cast like as follows results in error
>    query: SELECT * FROM CUSTOMER_TABLE WHERE NAMEZ  = ? || ?
>    error: SQLState: 42X35 "It is not allowed for both operands of '||' to be ? parameters."
> -Using parameter markers for only one variables without cast like as follows results in error
>    query: SELECT * FROM CUSTOMER_TABLE WHERE NAMEZ  = 'Frechette' || ?
>    error:SQLState: 42818 "Comparisons between 'VARCHAR' and 'LONG VARCHAR' are not supported." 
> -It works to cast to VARCHAR(2000), but not VARCHAR(2001) or larger.  Regardless of length, if it fails, the magic number is always 15. 

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