/*
** This C program extracts all "words" from an input document and adds them
** to an SQLite database. A "word" is any contiguous sequence of alphabetic
** characters. All digits, punctuation, and whitespace characters are
** word separators. The database stores a single entry for each distinct
** word together with a count of the number of occurrences of that word.
** A fresh database is created automatically on each run.
**
** wordcount DATABASE INPUTFILE
**
** The INPUTFILE name can be omitted, in which case input it taken from
** standard input.
**
** Option:
**
** --without-rowid Use a WITHOUT ROWID table to store the words.
** --insert Use INSERT mode (the default)
** --replace Use REPLACE mode
** --select Use SELECT mode
** --update Use UPDATE mode
** --nocase Add the NOCASE collating sequence to the words.
** --trace Enable sqlite3_trace() output.
**
** Modes:
**
** Insert mode means:
** (1) INSERT OR IGNORE INTO wordcount VALUES($new,1)
** (2) UPDATE wordcount SET cnt=cnt+1 WHERE word=$new -- if (1) is a noop
**
** Update mode means:
** (1) INSERT OR IGNORE INTO wordcount VALUES($new,0)
** (2) UPDATE wordcount SET cnt=cnt+1 WHERE word=$new
**
** Replace mode means:
** (1) REPLACE INTO wordcount
** VALUES($new,ifnull((SELECT cnt FROM wordcount WHERE word=$new),0)+1);
**
** Select mode modes:
** (1) SELECT 1 FROM wordcount WHERE word=$newword
** (2) INSERT INTO wordcount VALUES($new,1) -- if (1) returns nothing
** (3) UPDATE wordcount SET cnt=cnt+1 WHERE word=$new --if (1) return TRUE
**
******************************************************************************
**
** Compile as follows:
**
** gcc -I. wordcount.c sqlite3.c -ldl -lpthreads
**
** Or:
**
** gcc -I. -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \
** wordcount.c sqlite3.c
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdarg.h>
#include "sqlite3.h"
/* Print an error message and exit */
static void fatal_error(const char *zMsg, ...){
va_list ap;
va_start(ap, zMsg);
vfprintf(stderr, zMsg, ap);
va_end(ap);
exit(1);
}
/* The sqlite3_trace() callback function */
static void traceCallback(void *NotUsed, const char *zSql){
printf("%s;\n", zSql);
}
/* Define operating modes */
#define MODE_INSERT 0
#define MODE_REPLACE 1
#define MODE_SELECT 2
#define MODE_UPDATE 3
int main(int argc, char **argv){
const char *zFileToRead = 0; /* Input file. NULL for stdin */
const char *zDbName = 0; /* Name of the database file to create */
int useWithoutRowid = 0; /* True for --without-rowid */
int iMode = MODE_INSERT; /* One of MODE_xxxxx */
int useNocase = 0; /* True for --nocase */
int doTrace = 0; /* True for --trace */
int i, j; /* Loop counters */
sqlite3 *db; /* The SQLite database connection */
char *zSql; /* Constructed SQL statement */
sqlite3_stmt *pInsert = 0; /* The INSERT statement */
sqlite3_stmt *pUpdate = 0; /* The UPDATE statement */
sqlite3_stmt *pSelect = 0; /* The SELECT statement */
FILE *in; /* The open input file */
int rc; /* Return code from an SQLite interface */
int iCur, iHiwtr; /* Statistics values, current and "highwater" */
char zInput[2000]; /* A single line of input */
/* Process command-line arguments */
for(i=1; i<argc; i++){
const char *z = argv[i];
if( z[0]=='-' ){
do{ z++; }while( z[0]=='-' );
if( strcmp(z,"without-rowid")==0 ){
useWithoutRowid = 1;
}else if( strcmp(z,"replace")==0 ){
iMode = MODE_REPLACE;
}else if( strcmp(z,"select")==0 ){
iMode = MODE_SELECT;
}else if( strcmp(z,"insert")==0 ){
iMode = MODE_INSERT;
}else if( strcmp(z,"update")==0 ){
iMode = MODE_UPDATE;
}else if( strcmp(z,"nocase")==0 ){
useNocase = 1;
}else if( strcmp(z,"trace")==0 ){
doTrace = 1;
}else{
fatal_error("unknown option: %s\n", argv[i]);
}
}else if( zDbName==0 ){
zDbName = argv[i];
}else if( zFileToRead==0 ){
zFileToRead = argv[i];
}else{
fatal_error("surplus argument: %s\n", argv[i]);
}
}
if( zDbName==0 ){
fatal_error("Usage: %s [--options] DATABASE [INPUTFILE]\n", argv[0]);
}
/* Open the database and the input file */
if( sqlite3_open(zDbName, &db) ){
fatal_error("Cannot open database file: %s\n", zDbName);
}
if( zFileToRead ){
in = fopen(zFileToRead, "rb");
if( in==0 ){
fatal_error("Could not open input file \"%s\"\n", zFileToRead);
}
}else{
in = stdin;
}
/* Construct the "wordcount" table into which to put the words */
if( doTrace ) sqlite3_trace(db, traceCallback, 0);
if( sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, 0) ){
fatal_error("Could not start a transaction\n");
}
zSql = sqlite3_mprintf(
"CREATE TABLE wordcount(\n"
" word TEXT PRIMARY KEY COLLATE %s,\n"
" cnt INTEGER\n"
")%s",
useNocase ? "nocase" : "binary",
useWithoutRowid ? " WITHOUT ROWID" : ""
);
if( zSql==0 ) fatal_error("out of memory\n");
rc = sqlite3_exec(db, zSql, 0, 0, 0);
if( rc ) fatal_error("Could not create the wordcount table: %s.\n",
sqlite3_errmsg(db));
sqlite3_free(zSql);
/* Prepare SQL statements that will be needed */
if( iMode==MODE_SELECT ){
rc = sqlite3_prepare_v2(db,
"SELECT 1 FROM wordcount WHERE word=?1",
-1, &pSelect, 0);
if( rc ) fatal_error("Could not prepare the SELECT statement: %s\n",
sqlite3_errmsg(db));
rc = sqlite3_prepare_v2(db,
"INSERT INTO wordcount(word,cnt) VALUES(?1,1)",
-1, &pInsert, 0);
if( rc ) fatal_error("Could not prepare the INSERT statement: %s\n",
sqlite3_errmsg(db));
}
if( iMode==MODE_SELECT || iMode==MODE_UPDATE || iMode==MODE_INSERT ){
rc = sqlite3_prepare_v2(db,
"UPDATE wordcount SET cnt=cnt+1 WHERE word=?1",
-1, &pUpdate, 0);
if( rc ) fatal_error("Could not prepare the UPDATE statement: %s\n",
sqlite3_errmsg(db));
}
if( iMode==MODE_INSERT ){
rc = sqlite3_prepare_v2(db,
"INSERT OR IGNORE INTO wordcount(word,cnt) VALUES(?1,1)",
-1, &pInsert, 0);
if( rc ) fatal_error("Could not prepare the INSERT statement: %s\n",
sqlite3_errmsg(db));
}
if( iMode==MODE_UPDATE ){
rc = sqlite3_prepare_v2(db,
"INSERT OR IGNORE INTO wordcount(word,cnt) VALUES(?1,0)",
-1, &pInsert, 0);
if( rc ) fatal_error("Could not prepare the INSERT statement: %s\n",
sqlite3_errmsg(db));
}
if( iMode==MODE_REPLACE ){
rc = sqlite3_prepare_v2(db,
"REPLACE INTO wordcount(word,cnt)"
"VALUES(?1,coalesce((SELECT cnt FROM wordcount WHERE word=?1),0)+1)",
-1, &pInsert, 0);
if( rc ) fatal_error("Could not prepare the REPLACE statement: %s\n",
sqlite3_errmsg(db));
}
/* Process the input file */
while( fgets(zInput, sizeof(zInput), in) ){
for(i=0; zInput[i]; i++){
if( !isalpha(zInput[i]) ) continue;
for(j=i+1; isalpha(zInput[j]); j++){}
/* Found a new word at zInput[i] that is j-i bytes long.
** Process it into the wordcount table. */
if( iMode==MODE_SELECT ){
sqlite3_bind_text(pSelect, 1, zInput+i, j-i, SQLITE_STATIC);
rc = sqlite3_step(pSelect);
sqlite3_reset(pSelect);
if( rc==SQLITE_ROW ){
sqlite3_bind_text(pUpdate, 1, zInput+i, j-i, SQLITE_STATIC);
if( sqlite3_step(pUpdate)!=SQLITE_DONE ){
fatal_error("UPDATE failed: %s\n", sqlite3_errmsg(db));
}
sqlite3_reset(pUpdate);
}else if( rc==SQLITE_DONE ){
sqlite3_bind_text(pInsert, 1, zInput+i, j-i, SQLITE_STATIC);
if( sqlite3_step(pInsert)!=SQLITE_DONE ){
fatal_error("Insert failed: %s\n", sqlite3_errmsg(db));
}
sqlite3_reset(pInsert);
}else{
fatal_error("SELECT failed: %s\n", sqlite3_errmsg(db));
}
}else{
sqlite3_bind_text(pInsert, 1, zInput+i, j-i, SQLITE_STATIC);
if( sqlite3_step(pInsert)!=SQLITE_DONE ){
fatal_error("INSERT failed: %s\n", sqlite3_errmsg(db));
}
sqlite3_reset(pInsert);
if( iMode==MODE_UPDATE
|| (iMode==MODE_INSERT && sqlite3_changes(db)==0)
){
sqlite3_bind_text(pUpdate, 1, zInput+i, j-i, SQLITE_STATIC);
if( sqlite3_step(pUpdate)!=SQLITE_DONE ){
fatal_error("UPDATE failed: %s\n", sqlite3_errmsg(db));
}
sqlite3_reset(pUpdate);
}
}
i = j-1;
}
}
sqlite3_exec(db, "COMMIT", 0, 0, 0);
if( zFileToRead ) fclose(in);
sqlite3_finalize(pInsert);
sqlite3_finalize(pUpdate);
sqlite3_finalize(pSelect);
/* Database connection statistics printed after both prepared statements
** have been finalized */
sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_USED, &iCur, &iHiwtr, 0);
printf("-- Lookaside Slots Used: %d (max %d)\n", iCur,iHiwtr);
sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_HIT, &iCur, &iHiwtr, 0);
printf("-- Successful lookasides: %d\n", iHiwtr);
sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE, &iCur, &iHiwtr, 0);
printf("-- Lookaside size faults: %d\n", iHiwtr);
sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL, &iCur, &iHiwtr, 0);
printf("-- Lookaside OOM faults: %d\n", iHiwtr);
sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_USED, &iCur, &iHiwtr, 0);
printf("-- Pager Heap Usage: %d bytes\n", iCur);
sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_HIT, &iCur, &iHiwtr, 1);
printf("-- Page cache hits: %d\n", iCur);
sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_MISS, &iCur, &iHiwtr, 1);
printf("-- Page cache misses: %d\n", iCur);
sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_WRITE, &iCur, &iHiwtr, 1);
printf("-- Page cache writes: %d\n", iCur);
sqlite3_db_status(db, SQLITE_DBSTATUS_SCHEMA_USED, &iCur, &iHiwtr, 0);
printf("-- Schema Heap Usage: %d bytes\n", iCur);
sqlite3_db_status(db, SQLITE_DBSTATUS_STMT_USED, &iCur, &iHiwtr, 0);
printf("-- Statement Heap Usage: %d bytes\n", iCur);
sqlite3_close(db);
/* Global memory usage statistics printed after the database connection
** has closed. Memory usage should be zero at this point. */
sqlite3_status(SQLITE_STATUS_MEMORY_USED, &iCur, &iHiwtr, 0);
printf("-- Memory Used (bytes): %d (max %d)\n", iCur,iHiwtr);
sqlite3_status(SQLITE_STATUS_MALLOC_COUNT, &iCur, &iHiwtr, 0);
printf("-- Outstanding Allocations: %d (max %d)\n", iCur,iHiwtr);
sqlite3_status(SQLITE_STATUS_PAGECACHE_OVERFLOW, &iCur, &iHiwtr, 0);
printf("-- Pcache Overflow Bytes: %d (max %d)\n", iCur,iHiwtr);
sqlite3_status(SQLITE_STATUS_SCRATCH_OVERFLOW, &iCur, &iHiwtr, 0);
printf("-- Scratch Overflow Bytes: %d (max %d)\n", iCur,iHiwtr);
sqlite3_status(SQLITE_STATUS_MALLOC_SIZE, &iCur, &iHiwtr, 0);
printf("-- Largest Allocation: %d bytes\n",iHiwtr);
sqlite3_status(SQLITE_STATUS_PAGECACHE_SIZE, &iCur, &iHiwtr, 0);
printf("-- Largest Pcache Allocation: %d bytes\n",iHiwtr);
sqlite3_status(SQLITE_STATUS_SCRATCH_SIZE, &iCur, &iHiwtr, 0);
printf("-- Largest Scratch Allocation: %d bytes\n", iHiwtr);
return 0;
}