Please help with SQL command
Hi,
I'm trying to update a record but I don't know how to update one field in this record. This is my code so far
private void updateProcess() {
int nrows;
String sql = "UPDATE student SET s_first = '" + txtS_first.getText()
+ "', s_mi = '" + txtS_mi.getText()
+ "', s_last = '" + txtS_last.getText()
+ "', s_dob = TO_DATE('" + txtS_dob.getText() + "', 'MM/DD/YYYY')"
/* In a database table, after the s_dob column is f_id column, but a user will see info of this field by f_first and f_last instead of f_id. How can I update this column with f_id if a user's input is f_first and f_last? What if f_first and f_name that a user enters doesn't exist in the database, is there anyway to display an error for this case?
+ "', f_first = '" + txtF_first.getText()
+ "', f_last = '" + txtF_last.getText()
+ "' WHERE s_id = " + txtS_id.getText();
try {
nrows = stmt.executeUpdate(sql);
// I think this part I'm doing wrong because the text area doesn't display these strings
if(nrows > 0) {
lblShowResult.setText("Update successed");
lblShowResult.setVisible(true);
} // end if
else {
lblShowResult.setText("Update failed");
lblShowResult.setVisible(true);
} // end else
rset.close();
} // end try
catch (SQLException e) {}
catch (NullPointerException e){}
} // end updateProcess
If you read the docs for executeUpdate, you'll see that it returns the number of rows affected. So if it returns zero, then no rows matched.
Also, you should be using PreparedStatement rather than Statement. Then you won't have to worry about weird characters in strings or formatting dates (you can just give it a java.sql.Date object).
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-- Results
with t as (
select 'P11877' Mstr_Program, 1 Year_of_study, 'BUSI1490' program_module, 20 no_of_stud, 1 rank, 30 program_credits, 30 cumm_credits from dual union all
select 'P11877', 1, 'COMP1365', 20, 2, 30, 60 from dual union all
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select * from t;-- Each MSTR_PROGRAM can have 1 or many program_module
-- MSTR_PROGRAM's can run for 1 or 2 years (case above is two years) so some modules run in year 1 and some in year 2
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-- SUM(program_credits * 10) OVER (PARTITION BY Mstr_Program, Year_of_study
-- ORDER BY count(STUDENT_ID) desc ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) cumm_credits
-- I want to trim of any modules once the CUM_CREDITS hits 120. As seen above. I achieve this by wrapping the main query is another SELECT then LIMIT
-- that WHERE cum_credit <=120.
-- But what I need is:
-- In some cases the the cumm_credit maybe on lets say 90credits then the next module is worth 40 credits. This next module will not show as it
-- will be greater than 120 credits, so i need to pro-rata it:
-- So if credit_count > 120, then the last module is counted pro-rata as follows: 1- ((credit count - 120) / credits from last module
-- Can anyone help with how I can incorporate this into my current code: The SELECT portion of the Original SQL is below: I simplified column names
-- e.t.c in the above so they wont be the same
SELECT * FROM (
SELECT
,SR_PROGRAM Mstr_Program
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2, 2,
3, 3,
4, 3, SR_YEAR) year_of_study
,SCT_SUBJ_CODE||SCT_CRSE_NUMB program_module
,COUNT(student_ID) no_of_stud
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DECODE (sr_year, 1, 1,
2, 2,
3, 3,
4, 3, SR_YEAR) ORDER BY COUNT(student_id) DESC, scbcrse_title asc) rank
,(SCT_CREDIT_HRS * 10) program_credits
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2, 2,
3, 3,
4, 3, SR_YEAR)
ORDER BY count(student_id) desc ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) cumm_credits
WHERE cumm_credit <=120
ORDER BY Mstr_Program, YEAR_OF_STUDY, RANK asc;Maybe
SELECT Mstr_Program,year_of_study,program_module,no_of_stud,rank,program_credits old_program_credits,cumm_credits old_cumm_credits,
case when cumm_credits > 120
then program_credits - cumm_credits + 120
else program_credits
end new_program_credits,
case when cumm_credits > 120
then 120
else cumm_credits
end new_cumm_credits
FROM (SELECT SR_PROGRAM Mstr_Program,
DECODE(SORLCUR_YEAR,1,1,2,2,3,3,4,3,SR_YEAR) year_of_study,
SCT_SUBJ_CODE||SCT_CRSE_NUMB program_module,
COUNT(student_ID) no_of_stud,
row_number() OVER (PARTITION BY sr_program,DECODE(sr_year,1,1,2,2,3,3,4,3,SR_YEAR)
ORDER BY COUNT(student_id) DESC,scbcrse_title) rank,
10 * SCT_CREDIT_HRS program_credits,
10 * SUM(SCT_CREDIT_HRS) OVER (PARTITION BY sr_program,DECODE(sorlcur_year,1,1,2,2,3,3,4,3,SR_YEAR)
ORDER BY count(student_id) desc
ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) cumm_credits
WHERE 0 <= case when cumm_credits > 120
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else program_credits
end
ORDER BY Mstr_Program,YEAR_OF_STUDY,RANKRegards
Etbin
Edited by: Etbin on 16.12.2011 8:50
with
t as /* simulating the result achieved */
(select 'P11877' Mstr_Program,1 Year_of_study, 'BUSI1490' program_module,20 no_of_stud,1 rank,30 program_credits,30 cumm_credits from dual union all
select 'P11877', 1, 'COMP1365', 20, 2, 40, 70 from dual union all
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select 'P11877', 2, 'BUSI1329', 8, 4, 50, 160 from dual union all
select 'P11877', 2, 'MARK1138', 8, 5, 30, 190 from dual
select Mstr_Program,Year_of_study,program_module,no_of_stud,rank,program_credits old_credits,cumm_credits old_cumm,
case when cumm_credits > 120
then program_credits - cumm_credits + 120
else program_credits
end new_program_credits,
case when cumm_credits > 120
then 120
else cumm_credits
end new_cumm_credits
from t
where 0 <= case when cumm_credits > 120
then program_credits - cumm_credits + 120
else program_credits
end -
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<%@ page import="java.util.Date"%>
<%
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Columns on report
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Source File-TransHst (Type 14 is inventory cost change)
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Date: Sun, 26 Dec 2010 20:34:32 -0700
From: [email protected]
To: [email protected]
Subject: Please help with slideshow problems!
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