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Homework and Emergencies Homework & Coursework Questions UNIX- Database creating/viewing/updating assignment Post 302472391 by pludi on Wednesday 17th of November 2010 04:52:57 AM
Old 11-17-2010
Quick outline (pseudocode, no guarantee for correctness):
Code:
db=arg1
command=arg2

switch command:
    create:
        if exists db
            error
        if arg3 != ""
            echo arg3 > db
        else
            echo "Automobile Database" > db
        echo "New database created"
    add:
        make = arg3
        model = arg4
        year = arg5
        color = arg6

        if arg3 == ""
            ask make
        if arg4 == ""
            ask model
        if arg5 == ""
            ask year
        if arg6 == ""
            ask color
        if year < 1870 || year > 2020
            error
        echo "make, model, year, color" >> db
        echo "Successfully added a record to the database"
    view:
        switch arg3:
            max=$( wc -l db )
            all:
                cat db
            single:
                if arg4 > max
                    error
	        sed -ne "1p;arg4p" db
            range:
                if arg4 > max || arg5 > max || arg4 > arg5
                    error
	        sed -ne "1p;arg4,arg5p" db
    delete:
        switch arg3:
            max=$( wc -l db )
            all:
                sed -ie '2,$d' db
            single:
                if arg4 > max
                    error
	        sed -ie "arg4d" db
            range:
                if arg4 > max || arg5 > max || arg4 > arg5
                    error
	        sed -ie "arg4,arg5d" db
     *:
         show help

Useful reading:
Bash Beginners Guide
sed manpage
This User Gave Thanks to pludi For This Post:
 

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shevek::ristring(3)					     Library Functions Manual					       shevek::ristring(3)

NAME
shevek::ristring - shevek::ristring is identical to shevek::istring, but it uses std::string instead of Glib::ustring. SYNOPSIS
#include <iostring.hh> Public Member Functions ristring () Create a new istring with no data. ristring (std::string const &str) Create a new istring with data. void init (std::string const &str) Set new data to an existing istring. void push () Push the current position to the stack so it can be restored later. int pop (bool keep=false) Pop the last pushed position from the stack. void reset () Set the current position to 0, but don't change the stack. std::string rest () const Get remaining string. void skip (std::string::size_type p) Skip some characters. bool operator() (std::string const &format) Read a constant string from the input. template<typename T1 > bool operator() (std::string const &format, T1 &arg1) Read a string containing one argument from the input. template<typename T1 , typename T2 > bool operator() (std::string const &format, T1 &arg1, T2 &arg2) Read a string containing two arguments from the input. template<typename T1 , typename T2 , typename T3 > bool operator() (std::string const &format, T1 &arg1, T2 &arg2, T3 &arg3) Read a string containing three arguments from the input. template<typename T1 , typename T2 , typename T3 , typename T4 > bool operator() (std::string const &format, T1 &arg1, T2 &arg2, T3 &arg3, T4 &arg4) Read a string containing four arguments from the input. template<typename T1 , typename T2 , typename T3 , typename T4 , typename T5 > bool operator() (std::string const &format, T1 &arg1, T2 &arg2, T3 &arg3, T4 &arg4, T5 &arg5) Read a string containing five arguments from the input. template<typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 > bool operator() (std::string const &format, T1 &arg1, T2 &arg2, T3 &arg3, T4 &arg4, T5 &arg5, T6 &arg6) Read a string containing six arguments from the input. template<typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 > bool operator() (std::string const &format, T1 &arg1, T2 &arg2, T3 &arg3, T4 &arg4, T5 &arg5, T6 &arg6, T7 &arg7) Read a string containing seven arguments from the input. template<typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 > bool operator() (std::string const &format, T1 &arg1, T2 &arg2, T3 &arg3, T4 &arg4, T5 &arg5, T6 &arg6, T7 &arg7, T8 &arg8) Read a string containing eight arguments from the input. Static Public Member Functions template<typename T > static T direct (std::string const &data, std::string const &format, T def=T()) Read a variable from given data and return it. Detailed Description shevek::ristring is identical to shevek::istring, but it uses std::string instead of Glib::ustring. Member Function Documentation template<typename T > static T shevek::ristring::direct (std::string const &data, std::string const &format, Tdef = T ()) [inline, static] Read a variable from given data and return it. This allows using a shevek::istring in an expression without the need to create a new variable for it. If the input doesn't match the format, def is returned. int shevek::ristring::pop (boolkeep = false) Pop the last pushed position from the stack. If keep is true or not given, the current position is restored to the last position. If it is false, the current position is not changed. Author Generated automatically by Doxygen for libshevek from the source code. libshevek Fri May 11 2012 shevek::ristring(3)
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