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243 lines
6.9 KiB
C
243 lines
6.9 KiB
C
/*
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** 2014-07-28
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** This file implements a utility program that will load many disk
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** files (all files under a given directory) into a FTS table. This is
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** used for performance testing of FTS3, FTS4, and FTS5.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <assert.h>
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#include <string.h>
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#include <errno.h>
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#include <dirent.h>
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#include "sqlite3.h"
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/*
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** Implementation of the "readtext(X)" SQL function. The entire content
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** of the file named X is read and returned as a TEXT value. It is assumed
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** the file contains UTF-8 text. NULL is returned if the file does not
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** exist or is unreadable.
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*/
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static void readfileFunc(
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sqlite3_context *context,
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int argc,
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sqlite3_value **argv
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){
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const char *zName;
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FILE *in;
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long nIn;
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void *pBuf;
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zName = (const char*)sqlite3_value_text(argv[0]);
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if( zName==0 ) return;
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in = fopen(zName, "rb");
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if( in==0 ) return;
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fseek(in, 0, SEEK_END);
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nIn = ftell(in);
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rewind(in);
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pBuf = sqlite3_malloc( nIn );
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if( pBuf && 1==fread(pBuf, nIn, 1, in) ){
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sqlite3_result_text(context, pBuf, nIn, sqlite3_free);
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}else{
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sqlite3_free(pBuf);
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}
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fclose(in);
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}
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/*
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** Print usage text for this program and exit.
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*/
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static void showHelp(const char *zArgv0){
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printf("\n"
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"Usage: %s SWITCHES... DB\n"
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"\n"
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" This program opens the database named on the command line and attempts to\n"
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" create an FTS table named \"fts\" with a single column. If successful, it\n"
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" recursively traverses the directory named by the -dir option and inserts\n"
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" the contents of each file into the fts table. All files are assumed to\n"
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" contain UTF-8 text.\n"
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"\n"
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"Switches are:\n"
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" -fts [345] FTS version to use (default=5)\n"
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" -idx [01] Create a mapping from filename to rowid (default=0)\n"
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" -dir <path> Root of directory tree to load data from (default=.)\n"
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" -trans <integer> Number of inserts per transaction (default=1)\n"
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, zArgv0
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);
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exit(1);
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}
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/*
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** Exit with a message based on the argument and the current value of errno.
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*/
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static void error_out(const char *zText){
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fprintf(stderr, "%s: %s\n", zText, strerror(errno));
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exit(-1);
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}
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/*
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** Exit with a message based on the first argument and the error message
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** currently stored in database handle db.
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*/
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static void sqlite_error_out(const char *zText, sqlite3 *db){
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fprintf(stderr, "%s: %s\n", zText, sqlite3_errmsg(db));
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exit(-1);
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}
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/*
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** Context object for visit_file().
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*/
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typedef struct VisitContext VisitContext;
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struct VisitContext {
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int nRowPerTrans;
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sqlite3 *db; /* Database handle */
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sqlite3_stmt *pInsert; /* INSERT INTO fts VALUES(readtext(:1)) */
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};
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/*
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** Callback used with traverse(). The first argument points to an object
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** of type VisitContext. This function inserts the contents of the text
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** file zPath into the FTS table.
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*/
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void visit_file(void *pCtx, const char *zPath){
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int rc;
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VisitContext *p = (VisitContext*)pCtx;
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/* printf("%s\n", zPath); */
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sqlite3_bind_text(p->pInsert, 1, zPath, -1, SQLITE_STATIC);
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sqlite3_step(p->pInsert);
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rc = sqlite3_reset(p->pInsert);
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if( rc!=SQLITE_OK ){
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sqlite_error_out("insert", p->db);
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}else if( p->nRowPerTrans>0
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&& (sqlite3_last_insert_rowid(p->db) % p->nRowPerTrans)==0
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){
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sqlite3_exec(p->db, "COMMIT ; BEGIN", 0, 0, 0);
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}
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}
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/*
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** Recursively traverse directory zDir. For each file that is not a
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** directory, invoke the supplied callback with its path.
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*/
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static void traverse(
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const char *zDir, /* Directory to traverse */
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void *pCtx, /* First argument passed to callback */
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void (*xCallback)(void*, const char *zPath)
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){
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DIR *d;
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struct dirent *e;
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d = opendir(zDir);
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if( d==0 ) error_out("opendir()");
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for(e=readdir(d); e; e=readdir(d)){
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if( strcmp(e->d_name, ".")==0 || strcmp(e->d_name, "..")==0 ) continue;
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char *zPath = sqlite3_mprintf("%s/%s", zDir, e->d_name);
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if (e->d_type & DT_DIR) {
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traverse(zPath, pCtx, xCallback);
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}else{
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xCallback(pCtx, zPath);
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}
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sqlite3_free(zPath);
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}
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closedir(d);
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}
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int main(int argc, char **argv){
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int iFts = 5; /* Value of -fts option */
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int bMap = 0; /* True to create mapping table */
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const char *zDir = "."; /* Directory to scan */
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int i;
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int rc;
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int nRowPerTrans = 0;
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sqlite3 *db;
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char *zSql;
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VisitContext sCtx;
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int nCmd = 0;
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char **aCmd = 0;
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if( argc % 2 ) showHelp(argv[0]);
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for(i=1; i<(argc-1); i+=2){
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char *zOpt = argv[i];
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char *zArg = argv[i+1];
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if( strcmp(zOpt, "-fts")==0 ){
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iFts = atoi(zArg);
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if( iFts!=3 && iFts!=4 && iFts!= 5) showHelp(argv[0]);
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}
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else if( strcmp(zOpt, "-trans")==0 ){
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nRowPerTrans = atoi(zArg);
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}
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else if( strcmp(zOpt, "-idx")==0 ){
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bMap = atoi(zArg);
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if( bMap!=0 && bMap!=1 ) showHelp(argv[0]);
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}
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else if( strcmp(zOpt, "-dir")==0 ){
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zDir = zArg;
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}
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else if( strcmp(zOpt, "-special")==0 ){
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nCmd++;
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aCmd = sqlite3_realloc(aCmd, sizeof(char*) * nCmd);
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aCmd[nCmd-1] = zArg;
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}
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else{
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showHelp(argv[0]);
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}
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}
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/* Open the database file */
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rc = sqlite3_open(argv[argc-1], &db);
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if( rc!=SQLITE_OK ) sqlite_error_out("sqlite3_open()", db);
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rc = sqlite3_create_function(db, "readtext", 1, SQLITE_UTF8, 0,
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readfileFunc, 0, 0);
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if( rc!=SQLITE_OK ) sqlite_error_out("sqlite3_create_function()", db);
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/* Create the FTS table */
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zSql = sqlite3_mprintf("CREATE VIRTUAL TABLE fts USING fts%d(content)", iFts);
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rc = sqlite3_exec(db, zSql, 0, 0, 0);
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if( rc!=SQLITE_OK ) sqlite_error_out("sqlite3_exec(1)", db);
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sqlite3_free(zSql);
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for(i=0; i<nCmd; i++){
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zSql = sqlite3_mprintf("INSERT INTO fts(fts) VALUES(%Q)", aCmd[i]);
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rc = sqlite3_exec(db, zSql, 0, 0, 0);
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if( rc!=SQLITE_OK ) sqlite_error_out("sqlite3_exec(1)", db);
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sqlite3_free(zSql);
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}
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/* Compile the INSERT statement to write data to the FTS table. */
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memset(&sCtx, 0, sizeof(VisitContext));
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sCtx.db = db;
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sCtx.nRowPerTrans = nRowPerTrans;
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rc = sqlite3_prepare_v2(db,
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"INSERT INTO fts VALUES(readtext(?))", -1, &sCtx.pInsert, 0
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);
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if( rc!=SQLITE_OK ) sqlite_error_out("sqlite3_prepare_v2(1)", db);
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/* Load all files in the directory hierarchy into the FTS table. */
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if( sCtx.nRowPerTrans>0 ) sqlite3_exec(db, "BEGIN", 0, 0, 0);
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traverse(zDir, (void*)&sCtx, visit_file);
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if( sCtx.nRowPerTrans>0 ) sqlite3_exec(db, "COMMIT", 0, 0, 0);
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/* Clean up and exit. */
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sqlite3_finalize(sCtx.pInsert);
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sqlite3_close(db);
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sqlite3_free(aCmd);
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return 0;
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}
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