CRUD.sh

#!/bin/sh  
# Notice special chars inside key like / will replace with _ eg. abc/def => abc_def  
  
SED=/bin/sed  
DB=kv.db  
ensure_db_exist(){
 if [ $1 ];then
   DB=$1
 fi
 if [ ! -f $DB ];then
   # "generating db file..." 
   touch $DB 
 fi 
}
# $1 : key $2: db file name 
kv_get(){  
    ensure_db_exist $2
    key=`echo $1 | sed 's/\//_/g'`  
    # "debug: internal key: $key"
    $SED -n "s/^${key}=\(.*\)/\1/p" $DB 
}  
# $1:key $2:value $3:db file 
kv_set(){  
    ensure_db_exist $3
    key=`echo $1 | sed 's/\//_/g'`  
    ori_value=`kv_get $key`  
    if [ $ori_value ]  
    then  
        # "debug: replace the old value $ori_value to $2" 
        $SED -i "s/^${key}=.*$/${key}=${2}/" $DB  
    else  
        # "debug add a new record"  
        echo "$key=$2" >> $DB  
    fi  
}  
# delete  
# $1 : key  
kv_del(){  
    ensure_db_exist $2
    key=`echo $1 | sed 's/\//_/g'`  
    $SED  -i "/^${key}=/d"  $DB  
}

kv_test(){
  echo "kv_set name xun ./test.db"
  kv_set name xun ./test.db
  echo "kv_get name ./test.db"
  kv_get name ./test.db 
  echo "kv_del name ./test.db"
  kv_del name ./test.db
  echo "rm test.db -rf"
  rm test.db -rf
} 
# kv_test