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Generate sql statement using shell scripting

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Top Forums Shell Programming and Scripting Generate sql statement using shell scripting
# 8  
Old 02-01-2016
How about
Code:
awk -F, -v SQ="'" '
FNR == NR       {if (!/^#/) C[NR] = $0
                 next
                }
                {print "UPDATE EMP SET "
                 for (c in C) print "\t" C[c] " = " SQ $c SQ ","
                 print  "WHERE empno = " $1 ";"
                 print "commit;"
                }
' file[12]
UPDATE EMP SET 
    ename = 'KING',
    job = 'PRESIDENT',
    salary = '2000',
    deptno = '10',
WHERE empno = 7839;
commit;
UPDATE EMP SET 
    ename = 'BLAKE',
    job = 'ANALYST',
    salary = '1000',
    deptno = '13',
WHERE empno = 7840;
commit;
UPDATE EMP SET 
    ename = 'CLARK',
    job = 'PROGRAMMER',
    salary = '500',
    deptno = '13',
WHERE empno = 7841;
commit;
UPDATE EMP SET 
    ename = 'JONES',
    job = 'PROGRAMMER',
    salary = '550',
    deptno = '11',
WHERE empno = 7842;
commit;
UPDATE EMP SET 
    ename = 'SCOTT',
    job = 'ANALYST',
    salary = '550',
    deptno = '11 ',
WHERE empno = 7843;
commit;

Please note that the where - clause is using an invariable, constant column name as you didn't supply any means to identify the column to use.
This User Gave Thanks to RudiC For This Post:
vinus
# 9  
Old 02-02-2016
Thank you so much Rudic ! Its working as expected. I'm testing the code with more files and let you know if i find any issues.

Thanks for ur help!

---------- Post updated 02-02-16 at 01:43 PM ---------- Previous update was 02-01-16 at 04:13 PM ----------

Rudic,
Thanks for your help ! I found one minor issue while testing the code. Currently i'm getting output like this. I need to remove last comma before WHERE in SQL update . My sql will not work if there is a comma in the end of SET command.
Code:
UPDATE EMP SET 
    ename = 'JONES',
    job = 'PROGRAMMER',
    salary = '550',
    deptno = '11',
WHERE empno = 7842;

desired output:
Code:
UPDATE EMP SET 
    ename = 'JONES',
    job = 'PROGRAMMER',
    salary = '550',
    deptno = '11'
WHERE empno = 7842;

I'm trying other option to remove last comma before WHERE in SQL update using sed command. Please assist?
Thanks
# 10  
Old 02-02-2016
It's a bit difficult to remove chars from a line already printed, so I'd propose to do the whole thing in one single line. Would this do?
Code:
awk -F, -v SQ="'" '
FNR == NR       {if (!/^#/) C[NR] = $0
                 next
                }
                {DL = ""
                 printf "UPDATE EMP SET"
                 for (c in C)   {printf "%s %s = %s%s%s", DL, C[c], SQ, $c, SQ
                                 DL = FS
                                }
                 printf  " WHERE empno = %s;\n", $1
                 print "commit;"
                }
' file[12]
UPDATE EMP SET ename = 'KING', job = 'PRESIDENT', salary = '2000', deptno = '10' WHERE empno = 7839;
commit;
UPDATE EMP SET ename = 'BLAKE', job = 'ANALYST', salary = '1000', deptno = '13' WHERE empno = 7840;
commit;
UPDATE EMP SET ename = 'CLARK', job = 'PROGRAMMER', salary = '500', deptno = '13' WHERE empno = 7841;
commit;
UPDATE EMP SET ename = 'JONES', job = 'PROGRAMMER', salary = '550', deptno = '11' WHERE empno = 7842;
commit;
UPDATE EMP SET ename = 'SCOTT', job = 'ANALYST', salary = '550', deptno = '11 ' WHERE empno = 7843;
commit;

---------- Post updated at 19:01 ---------- Previous update was at 19:00 ----------

I think SQL does accept one line UPDATE statements, doesn't it?
Last edited by RudiC; 02-02-2016 at 02:13 PM..
This User Gave Thanks to RudiC For This Post:
vinus
# 11  
Old 02-02-2016
Thanks Rudic !

Yes, the SQL does accept one line UPDATE statements. I tried your code with few columns and its working as expected. I think the sql will work even if we have one line update statements with more columns ( ex: 30 to 40). if there is a problem i can use sed command to remove the last comma after we generate the update statement.

Thank u so much for your help !
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