Add option for cache.

[aero]

Hi,
I made and used my own utility for similar purpose.

If csv file is very large, every .import csv procedure makes delay.
So I solved the problem with backed up dump of imported csv sqlite db.
The following is my script.

#!/bin/bash
if [[ $# -eq 0 ]]; then
    cat << HELP

Usage:

${0##*/} myfile.csv  ---> view csv fields schema and sample data.
${0##*/} myfile.csv 'select ... from myfile ... ;' ---->  query csv.

HELP
    exit 1
fi

csv_file=$1
shift

table=${csv_file%%.*}

query=".schema
select * from $table limit 1;"

if [[ "$@" ]]; then
    query="$@"
fi

if [[ -f "$table.db" ]]; then
cat << EOF | sqlite3 $table.db
.mode csv
.headers on
$query
EOF

else
cat << EOF | sqlite3
.mode csv
.import $csv_file $table
.headers on
.backup main $table.db
$query
EOF

fi

How about adding option like -c ( cache) or -d ( use database) for making dumb db at first execution and using dumped db if db file exists.