Using mysql decode function in Java

Hi everybody,
mysql documentation says:
DECODE(crypt_str,pass_str) -->
Decrypts the encrypted string crypt_str using pass_str as the password. crypt_str should be a string returned from ENCODE().
I used the above function in a Python script and had no problem, but have difficulty using the same thing in my Java code.
I receive runtime error when tried decode() in my Java code in executeQuery("s");. As far as I know the decode() function should be compiled, I can't run the decode() in the mysql command tool and receive a response (as I compiled and ran it in my Python script).
Has anybody ever used this function in the Java code? How? What format did you use? What I should use instead of "s" in this code?
conn is a database connection:
stmt = conn.createStatement();
rs = stmt.executeQuery("s");
I even tried PreparedStatement, but no luck.
Any help is greatly appreciated.

stmt.executeQuery("select blahblahblah, DECODE(fieldName, password), blahblahblah FROM blahblah...")

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12.2. Control Flow Functions
CASE value WHEN [compare_value] THEN result [WHEN [compare_value] THEN result ...] [ELSE result] END
CASE WHEN [condition] THEN result [WHEN [condition] THEN result ...] [ELSE result] END
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mysql> SELECT CASE 1 WHEN 1 THEN 'one'
-> WHEN 2 THEN 'two' ELSE 'more' END;
-> 'one'
mysql> SELECT CASE WHEN 1>0 THEN 'true' ELSE 'false' END;
-> 'true'
mysql> SELECT CASE BINARY 'B'
-> WHEN 'a' THEN 1 WHEN 'b' THEN 2 END;
-> NULL
The default return type of a CASE expression is the compatible aggregated type of all return values, but also depends on the context in which it is used. If used in a string context, the result is returned as a string. If used in a numeric context, then the result is returned as a decimal, real, or integer value.
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IF(expr1,expr2,expr3)
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mysql> SELECT IF(1>2,2,3);
-> 3
mysql> SELECT IF(1<2,'yes','no');
-> 'yes'
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expr1 is evaluated as an integer value, which means that if you are testing floating-point or string values, you should do so using a comparison operation.
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-> 0
mysql> SELECT IF(0.1<>0,1,0);
-> 1
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Expression Return Value
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-> 1
mysql> SELECT IFNULL(NULL,10);
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-------------------------------------------+
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| test | char(4) | | | | |
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mysql> SELECT NULLIF(1,2);
-> 1
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Previous / Next / Up / Table of Contents
User Comments
Posted by I W on July 12 2005 5:52pm [Delete] [Edit]
Don't use IFNULL for comparisons (especially not for Joins)
(example:
select aa from a left join b ON IFNULL(a.col,1)=IFNULL(b.col,1)
It's terrible slow (ran for days on two tables with approx 250k rows).
Use <=> (NULL-safe comparison) instead. It did the same job in less than 15 minutes!!
Posted by [name withheld] on November 10 2005 12:12am [Delete] [Edit]
IFNULL is like oracle's NVL function (these should help people searching for NVL() ..)
Posted by Philip Mak on May 26 2006 7:14am [Delete] [Edit]
When using CASE, remember that NULL != NULL, so if you write "WHEN NULL", it will never match. (I guess you have to use IFNULL() instead...)
Posted by Marc Grue on June 24 2006 2:03pm [Delete] [Edit]
You can ORDER BY a dynamic column_name parameter using a CASE expression in the ORDER BY clause of the SELECT statement:
CREATE PROCEDURE `orderby`(IN _orderby VARCHAR(50))
BEGIN
SELECT id, first_name, last_name, birthday
FROM table
ORDER BY
-- numeric columns
CASE _orderby WHEN 'id' THEN id END ASC,
CASE orderby WHEN 'desc id' THEN id END DESC,
-- string columns
CASE orderby WHEN 'firstname' THEN first_name WHEN 'last_name' THEN last_name END ASC,
CASE orderby WHEN 'descfirst_name' THEN first_name WHEN 'desc_last_name' THEN last_name END DESC,
-- datetime columns
CASE _orderby WHEN 'birthday' THEN birthday END ASC,
CASE orderby WHEN 'desc birthday' THEN birthday END DESC;
END
Since the CASE expression returns the "compatible aggregated type of all return values", you need to isolate each column type in a separate CASE expression to get the desired result.
If you mixed the columns like
CASE _orderby
WHEN 'id' THEN id
WHEN 'first_name' THEN first_name
...etc...
END ASC
.. both the id and first_name would be returned as a string value, and ids would be sorted as a string to '1,12,2,24,5' and not as integers to '1,2,5,12,24'.
Note that you don't need a "ELSE null" in the CASE expressions, since the CASE expression automatically returns null if there's no match. In that case, you get a "null ASC" in your ORDER BY clause which doesn't affect the sort order. If for instance orderby is 'descfirst_name', the ORDER BY clause evaluates to:
ORDER BY null ASC, null DESC, null ASC, first_name DESC, null ASC, null DESC
Effectively the same as "ORDER BY first_name DESC". You could even add a new set of CASE expressions for a second order column (or more..) if you like.
Add your own comment.

What is that post supposed to be?

How to use a decode function

I want to use the following with decode, recently started on BODS.
Can you please provide the steps to use decode function
in source tabke fieldname is ordid and in target fieldname is Orderid
decode(Order_ID = 1709,lpad(Order_ID,7,'700'),Order_ID)
thank you very much for the helpful i

1) In the mapping tab of target column, click on Functions, select Miscellaneous Functions category, you can find decode function in it. Lpad can be found in String functions category.
OR
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SQL>

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Dear Sir / Madam,
Thanks for your understanding.
Right now I am facing a unique problem.
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is their a way to find whether the column datatype is number or char , so that i can check the column datatype before the decode funciton is applied ..
thanks ..
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Why is coldfusion killing the connection?
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DECODE function to validate date value and sort the records

Hi Friends,
I am looking for some query which can give me the required output,
I need to do this using SQL query only and I have tried using the MIN() and MAX() functions it was working fine with limited data, now after inserting the last record(in the below table) which has date for start_range and end_range in(mm/dd/yyyy hh24:mi:ss) format.
Because the data type is VARCHAR2 if I am using the MIN() function it is sorting as a string value, hence the min date is incorrect. I tried using validating the value to date or non date and tried to using MIN() and MAX() functions using the DECODE function, I am getting this error "ORA-01840: input value not long enough for date format".
select table_name,
DECODE(substr(START_RANGE,3,1)||substr(START_RANGE,6,1)||substr(START_RANGE,11,1)||substr(START_RANGE,14,1)||substr(START_RANGE,17,1),'// ::',
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DECODE(substr(END_RANGE,3,1)||substr(A.END_RANGE,6,1)||substr(END_RANGE,11,1)||substr(END_RANGE,14,1)||substr(END_RANGE,17,1),'// ::',
to_char(max(to_date(END_RANGE,'mm/dd/yyyy hh24:mi:ss')),'MM/DD/YYYY HH24:MI:SS'),max(END_RANGE)) MAX_RUNS_END_RANGE
from MY_TABLE
GROUP BY table_name,
(substr(START_RANGE,3,1)||substr(START_RANGE,6,1)||substr(START_RANGE,11,1)||substr(START_RANGE,14,1)||substr(START_RANGE,17,1)),
(substr(END_RANGE,3,1)||substr(END_RANGE,6,1)||substr(END_RANGE,11,1)||substr(END_RANGE,14,1)||substr(END_RANGE,17,1))
Can sombody please advise what is the best way I can query this data with the required output.
The following are the source table and records and the out put records using the sql query.
MY_TABLE
TABLE_NAME(VARCHAR2),START_RANGE(VARCHAR2),END_RANGE(VARCHAR2)
TABLE1,1000,10000
TABLE2,ABCD,EEEE
TABLE3,01/12/2010 00:00:00,12/31/2010 23:59:59
TABLE1,10001,20000
TABLE2,EEEF,GGGG
TABLE3,01/01/2011 00:00:00,01/31/2011 23:59:59
OUTPUT :
TABLE_NAME,MIN(START_RANGE),MAX(END_RANGE)
TABLE1,1000,20000
TABLE2,ABCD,GGGG
TABLE3,01/12/2010 00:00:00,01/31/2011 23:59:59
Thanks
Kalycs

i also think this is a very bad table design ...
but if you are not able to change it, you could split the select (date and non-date data) and combine the result with UNION like this:
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FROM t
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GROUP BY table_name
UNION
SELECT table_name,
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FROM t
WHERE start_range NOT LIKE '%/%/%:%:%'
GROUP BY
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TABLE_ MIN_VALUE           MAX_VALUE
TABLE1 1000                20000
TABLE2 ABCD                GGGG
TABLE3 01/12/2010 00:00:00 01/31/2011 23:59:59

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Hi,
When I use the decode function in a query (Reports 3.0.5.8.0) I receive an error message "Bind Variable Does Not Exist" (ORA-1006). When I remove the decode function from the query, the query compiles fine. All table and column references are existing.
Also, the same query runs perfectly fine from SQL*Plus. The OS is Win 2000, SP2
Any idea if this is a bug? Is there any way out? Do get back as this is very urgent.
The database is Oracle 8i Ent, 8.1.7 on AIX 4.3
The query is as follows:
SELECT NAM_CMP , COD_CMP , COD_CMP_REG ,
DECODE(FLG_CMP_SHP,'Y','S/',' /') || DECODE(FLG_CMP_AGT,'Y','A/',' /') || DECODE(FLG_CMP_CNE,'Y','C',' ') TYPE ,
DES_ADD_STT , DES_ADD_PLC , DES_ADD_STA , DES_ADD_POS , COD_CTY , COD_cou_iso ,
DAT_LST_AST , DAT_LST_UPD,
cod_dcl_box_num, decode(cod_imp_chg_way,'C','CASH','CREDIT') cod_imp_chg_way,
decode(cod_imp_cre_way,'W','WEEKLY','F','FIFTEEN DAYS','M','MONTHLY', NULL) cod_imp_cre_way,
decode(flg_imp_prn_inv, 'N', null, flg_imp_prn_inv) flg_imp_prn_inv,
cod_bro_box_num, decode(cod_exp_chg_way,'C','CASH','CREDIT') cod_exp_chg_way,
decode(cod_exp_cre_way,'W','WEEKLY','F','FIFTEEN DAYS','M','MONTHLY', NULL) cod_exp_cre_way,
decode(flg_exp_prn_inv, 'N', null, flg_exp_prn_inv) flg_exp_prn_inv
FROM CMP
where dat_can is null

Try TO_CHAR(NULL) instead of NULL in all DECODE functions.
For example:
decode(cod_imp_cre_way,'W','WEEKLY','F','FIFTEEN DAYS','M','MONTHLY', TO_CHAR(NULL))
instead of:
decode(cod_imp_cre_way,'W','WEEKLY','F','FIFTEEN DAYS','M','MONTHLY', NULL).

Decode function involving 2 fields (urgent)

Hi .. I am trying to use the decode function involving 2 fields.
The query runs but does not produce the correct results. If
anyone knows, please reply .. Usually decode function involves
one column only but I have more
than one. The situation is : If ins_code = 2 or special_code =
MMI, put a 'Y', otherwise, it's a 'N'. Does anyone know how to
put this in a decode statement? Thanks

Thanks, Suresh ... but I have to put this condition using the
decode statement because that's how the rest of the program is
written. It's part of the script that I have to change. The
current statement is this: decode(ins_code, '2', 'Y', 'N'). I
have to change it to ins_code =2 or special_feature = MMI.
Please reply ... thanks a lot....

Using mysql decode function in Java

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