Programming :: SQLite Read, Write, Select, Compare Statements For C++
Jun 9, 2010
I am using C++ with SQLite db in a program that will read read a sub set of records, compare records and write different records to another database. I have a SQLite book, but it only shows examples for the C API. Anyone have code samples in C++ for the following:
Open database
Close
Select *
Read
Write
Or, just show me how to execute a SQL statement with C++ and I can then figure out the various SQL statements I need.
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Aug 11, 2010
I'm writing an if statement where a variable is a number such as 14.05 (this is actually a temperature) and I want to compare it to a predefined value, sample code below:
Code:
I have all sorts of errors regardless of how I do this (double quotes, square brackets). The best idea I've had is stripping off the decimal place so it's a 4 digit number (e.g warning=1503 and DEV_TMP=1405) however this seems a little unnescessary and I'm sure there's an easier way of achieving the same thing.
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Jun 3, 2010
I have been looking for a script example of reading and writing to the parallel port's data, status, and control registers using bash. I see it done in pascal, tcl, etc. but nothing in bash.
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Apr 13, 2011
I need programmer a timer of 10 ms for read/write a USB device
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Mar 8, 2011
I'm currently developping a C program to drive a Telit GM862-GPS module using the serial port of an embedded board (SBC9261).The communication with the module is based on AT commands : I just send my command to the module, through the RS232 line, and the module answers immediately.Here's an example with a basic command returning the GPS's acquired position, sent with Minicom :
Code:
AT$GPSACP
$GPSACP: 104323.000,4x45.6171N,00x38.6219E,0.8,446.5,3,272.14,0.21,0.11,080311,09
[code]...
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Apr 7, 2010
i am trying to write a program which will read input from a text file, check if each line contains any alphabets and then display a message imforming me if there is an alphabet in each line. My text file is formatted in this way...
[Code]....
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Feb 5, 2011
I cannot seem to get if else statements to work. if $choice == Dog then i want it to say "you selected Dog" The variable choice has the value Dog in it as proved at the end by echo "yes $choice is $choice" following the error Code: ./test.sh: 37: [$choice: not found How do i get the conditional statement to work? What's wrong here? This is the full script:
Code:
#! /bin/sh
: ${DIALOG=dialog}
: ${DIALOG_OK=0}
[code]....
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Jan 18, 2011
I have a file like below
ADP_Comment- 4758
ADP_Comment-is missing
cbdkbckd- 46983
[code]...
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Jun 10, 2010
Anyone know how to execute SQLite db commands from C++?
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Nov 19, 2008
I am using SQLite as my database for some portable cross platform applications I am working on with REALBasic as my IDE. I have an old Sybase 8.0 database that I can access via Microsoft Access and thereby extract the data I need from each table.
Now I know I can create .csv files from each table and load them into SQLite using the import tool, but then I can't define the primary key and other field attributes. So the other option is to load each file via SQL.
Now with most SQL editors I can create multiple queries and they will run just fine. But I can't seem to do that with the SQLite interfaces. I can paste multiple queries but I can only run one at a time. And by that I mean I have to click run.
Ummm that's not acceptable since my biggest table contains over 600,000 records. I have the queries all written, that was easy using a simple interface I wrote in Access.
Code:
INSERT INTO tblMeters(recordId,meterId,meterName,meterSerNum,registerSerNum,mxuSerNum,meterType,manufacture,meterModel,readType,groupId,multiplier,rollover,vendorId,xfrmerCode,bldgCode,CATEGORY,energyType,unitOfMeasure,location,access,comments,dateInstalled,dateCalibrate,pipeSizeIn,pipeSizeOut,elecMeterSpecs)
[Code]...
So is there another method I can use? I can't seem to find anything relating to my particular question at the SQLite web site
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Jun 15, 2010
I have the following TCL code:
if{ [catch {sqlite3 db /path/to/db/file} result] } {
puts stderr $result
} else {
do something
}
What I want is to use a variable for the file name/path. When I put in a variable instead of the absolute path, I get an error: "missing close-brace: possible unbalanced brace in comment while executing"
This is weird because when I run the code with the fully qualified pathname, it works fine. I substitute out the pathname for a variable containing the pathname ($variable) and I get this error.
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Apr 8, 2010
I'm sure I'm missing something pretty obvious, but I can't for the life of me stop my pysqlite scripts crashing out with a database is locked error. I have two scripts, one to load data into the database, and one to read data out, but both will frequently, and instantly, crash depending on what the other is doing with the database at any given time.I've got the timeout on both scripts set to 30 seconds: cx = sqlite.connect("database.sql", timeout=30.0)and think I can see some evidence of the timeouts in that i get what appears to be a timing stamp (e.g 0.12343827e10 1) dumped occasionally in the middle of my curses formatted output screen, but no delay that ever gets remotely near the 30 second timeout, but still one of the other keeps crashing again and again from this. I'm running RHEL5.4 on a 64 bit HS21 IBM blade, and have heard some mention about issues about multi-threading and am not sure if this might be relevant.
Packages in use are sqlite-3.3.6-5 and python-sqlite-1.1.7-1.2.1, and upgrading to newer versions outside of RedHat's official provisions is not a great option for me. Possible, but not desirable due to the environment in general.I have had autocommit=1 on previously on both scripts, but have since disabled on both, and am now cx.commit()ing on the inserting script and not committing on the select script. Ultimately as I only ever have one script actually making any modifications, I don't really see why this locking should ever ever happen
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Feb 4, 2010
What are the possible problem when Windows access the file from Ubuntu got Read Only even though have a full permission to read, write and execute the file? Ubuntu to Ubuntu accessing the file there is no problem only Windows got a problem.
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Dec 14, 2010
I have a database of around 4000 files. I use rsync script to transfer from 2 separate updated hdd every month but I need a way to compare a .txt file or .xml file to the updated drive as I cannot use rsync delete because I can not mount all 3 drives at the same time?
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Mar 1, 2011
Actually build a script which can monitor the "DateTimeHourMinute" in a data file.
I wanted to compare the "DateTimeHourMinute" from the 2nd column against "DateTimeHourMinute" on the 3rd column which located in the same line.
Below is the data sample:
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Jan 3, 2009
I have a large number of files, all of them named /*/*.xyz I need to match them to potential files name /*/*.abc I have tried find -name *xyz |awk '// {print '$NF'}' | awk '{print $NF }' but the result has the full path I just need the filename without the extention, and without the full path.
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Aug 21, 2010
I would like to compare to mysql rows as follows:
Select count(*) from stocks2.historical where close*1.05 < (select open from stocks2.historical where date = date_add(date,interval 1 day))
and year(date)=2010;
The problem is with the "date" in bold... i want that date to be the date of the previous row. is there a way to do that purely with mysql? (naturally, i can write a script to go through and compare each date; what i'm asking for is a mysql solution.)
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May 23, 2011
I have a (rather large) database of mp3 track information. I also have several directories of the actual mp3s. I'm trying to write a simple bash script that will check the contents of the directories against what's in the database, and upon finding a file that isn't in the database, do something.
Here's what I have so far:
Code:
The trouble I'm having (in the sample directory of "/mnt/music/B/Beatles, The/" the file "Beatles, The - Taxman.mp3" isn't in the database.) is getting it to actually trigger an error when an entry isn't in the database.
Once triggering on a non-entered file is working, any way to get it to traverse the entire /mnt/music hierarchy?
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Jul 24, 2011
Whats wrong with this:
Code:
#include <stdio.h>
int main(int argc, char *argv[])
{
if(argv[4] == "-verbose")
{
printf("Verbose is on");
[Code]...
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Jul 16, 2011
Dear expertsI have files like
ABD : 5869 events, relative ratio : 1.173800E-01 , sum of ratios : 1.173800E-01
VBD : 12147 events, relative ratio : 2.429400E-01 , sum of ratios : 3.603200E-01
SDF : 17000 events, relative ratio : 3.400000E-01 , sum of ratios : 7.003200E-01
[code]....
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Jun 22, 2011
I am trying to compare two filenames including the paths. Basically if two paths are similar then my program wants to display message. So I need to check for if two pathnames are same in the sorce and destination. So I was trying for the code to compare tow filename sincluding "" and if the Parent FIle Path is found in the child file path then I need to displays ome message. I was trying to modify something like this:
#!/bin/ksh
# Sample script
file1="C:TextLatestArticleNews.txt"
[code]....
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Dec 31, 2010
i am trying this query to compare records of two different tables...i m geting this message!! no required out putvalues for these ($jobTitle $industry $stationBase $gender $maritalStatus)are coming from textboxes!here is the code...
PHP Code:
$query = "(SELECT *,
MATCH(industry, gender, maritalStatus , typeofWorkPosition , preferCity) AGAINST ('$
[code]....
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Mar 28, 2011
I have two files with user DN's that exported from two different LDAP directories. I wanted to write a script that reads(checks) users (cn=user1) in file Ack to see if users(cn=user1) exists in file B and give me nice output with what users are missing in file B.I have around 30k users in file A with following format..Quote:
cn=user1,ou=some,o=org
cn=user2,ou=some,o=org
cn=user3,ou=some,o=org
[code]...
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Nov 5, 2010
I would like to compare two md5sum outputs to see if the files match. in my script I have
Code:
ORG_FILE="/path/to/org/file.zip"
NEW_FILE="path/to/new/file.zip"
MD5_ORIG=$(md5sum -b "$ORG_FILE")
[code]....
How do I get just the MD5 hash and not the */.... stuff so I can compare them. i tried Code: JUST_HASH=${$MD5_ORIG:0:32} but All I get is
dir_mon_notify.sh: line 79: ${$MD5_ORIG:0:32}: bad substitution
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May 15, 2010
I'm writing a loganalysis application and wanted to grab apache log records between two certain dates. Assume that a date is formated as such: 22/Dec/2009:00:19 (day/month/year:hour:minute) Currently, I'm using a regular expression to replace the month name with its numeric value, remove the separators, so the above date is converted to: 221220090019 making a date comparison trivial.. but.. Running a regex on each record for large files, say, one containing a quarter million records, is extremely costly.. is there any other method not involving regex substitution? here's the function doing the convertion/comparison
[Code]...
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Dec 9, 2010
how to program in bash, an i have a problem, i am trying compare values in between 2 values (from another file), so far my solution is to make a nested for loop, but that causes it to compare every value. Here is a visulization of what i want
file.a 2,3,4,5
file.b
3 5
[code]...
i want the values 2, 3, 4, 5 from file.a to be compared inbetween values 3 5, 6 9,1 2, 4 7 from file.b (var1 is the value im comparing, var2 is the less value, var 3 is the greater value)
for i in $var1
do
for k in $var2
do
[code]....
my problem with the above code is it compares EVERYINNG, not the values inbetween what i want (which is 3 5, 6 9 etc).
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Mar 8, 2010
I want to compare the following two tab-delimited .txt files (both were subsets of the original files) by comparing Columns 3 and 4 simultaneously. It is easy to compare C3 because both C3s are just numbers. But how to compare C4s?Basically, in File1, "G,G" = G in File2, "C,C" = C in File2, "A,A" = A in File2, "T,T"= T in File2.In File2, A/T in Column4 just equals "A,T" or "T,A" in Column4 of File1. C/T in Column4 just equals "C,T" or "T,C" in Column4 of File1, and etc.
File1:
C1C2 C3C4
ih509rs12345467244750"G,G"
ih499rs6049687244911"C,C"
ih508- 7244977"A,A"
[code]....
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Feb 15, 2011
I'm working with Radiotap headers right now. I want to get the RSSI data. I came through a problem that I can't figure out right now.The value that I need to get is:
Code:
s8 IEEE80211_RADIOTAP_DBM_ANTSIGNAL
now, when I printf it:
[code]...
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Oct 4, 2010
I need to create a script that will compare the differences between two folders and then to copy only the updated and new files only to another directory. I know I need to use rsync here, I can write scripts so really it not how to create a script it is how do I accomplish the transfer of only new or changes files between two folders to a new file. Do I need to link these two folders first and then use the "--compare-dest" switch.
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Oct 20, 2010
Have a bash script which contains a line like this:
if [[ ${array[${last}]} =~ "screenpc.PRODUCTION.*" ]]
which WORKED as expected in bash 4.0.33 and now fails in 4.1.2
Instrumented the script to print the value of the left-hand side and it is exactly what is expected.
As noted above, this has been working fine until we installed Fedora 13 (kernel 2.6.33), and now it fails.
Tried setting shell 'extglob' to On with same results.
Did something change? Are there other shell/bash options that need to be set?this has the whole installation stopped!
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