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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

Artifact 9fc98427d1e23e84429d7e6d07d9094fbdec65a5:


/*
** This program is used to generate and verify databases with hot journals.
** Use this program to generate a hot journal on one machine and verify
** that it rolls back correctly on another machine with a different
** architecture.
**
** Usage:
**
**     rollback-test new [-utf8] [-utf16le] [-utf16be] [-pagesize=N] DATABASE
**     rollback-test check DATABASE
**     rollback-test crash [-wal] [-rollback] DATABASE
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sqlite3.h"

static void usage(char *argv0){
  fprintf(stderr,
    "Usage: %s new [-utf8] [-utf16le] [-utf16be] [-pagesize=N] DATABASE\n"
    "       %s check DATABASE\n"
    "       %s crash [-wal] DATABASE\n",
    argv0, argv0, argv0
  );
  exit(1);
}

static sqlite3 *openDb(const char *zFilename){
  int rc;
  sqlite3 *db;
  rc = sqlite3_open(zFilename, &db);
  if( rc ){
    fprintf(stderr, "Cannot open \"%s\": %s\n",
            zFilename, sqlite3_errmsg(db));
    sqlite3_close(db);
    exit(1);
  }
  return db;
}

static int nReply = 0;
static char zReply[1000];

static int execCallback(void *NotUsed, int nArg, char **azArg, char **azCol){
  int i, n;
  char *z;
  for(i=0; i<nArg; i++){
    z = azArg[i];
    if( z==0 ) z = "NULL";
    if( nReply>0 && nReply<sizeof(zReply)-1 ) zReply[nReply++] = ' ';
    n = strlen(z);
    if( nReply+n>=sizeof(zReply)-1 ) n = sizeof(zReply) - nReply - 1;
    memcpy(&zReply[nReply], z, n);
    nReply += n;
    zReply[nReply] = 0;
  }
  return 0;
}

static void runSql(sqlite3 *db, const char *zSql){
  char *zErr = 0;
  int rc;
  nReply = 0;
  rc = sqlite3_exec(db, zSql, execCallback, 0, &zErr);
  if( zErr ){
    fprintf(stderr, "SQL error: %s\n", zErr);
    exit(1);
  }
  if( rc ){
    fprintf(stderr, "SQL error: %s\n", sqlite3_errmsg(db));
    exit(1);
  }
}

int main(int argc, char **argv){
  sqlite3 *db;
  int i;

  if( argc<3 ) usage(argv[0]);
  if( strcmp(argv[1], "new")==0 ){
    db = openDb(argv[argc-1]);
    for(i=2; i<argc-1; i++){
      if( strcmp(argv[i],"-utf8")==0 ){
        runSql(db, "PRAGMA encoding=UTF8");
      }else if( strcmp(argv[i], "-utf16le")==0 ){
        runSql(db, "PRAGMA encoding=UTF16LE");
      }else if( strcmp(argv[i], "-utf16be")==0 ){
        runSql(db, "PRAGMA encoding=UTF16BE");
      }else if( strncmp(argv[i], "-pagesize=", 10)==0 ){
        int szPg = atoi(&argv[i][10]);
        char zBuf[100];
        sprintf(zBuf, "PRAGMA pagesize=%d", szPg);
        runSql(db, zBuf);
      }else{
        fprintf(stderr, "unknown option %s\n", argv[i]);
        usage(argv[0]);
      }
    }
    runSql(db, 
       "BEGIN;"
       "CREATE TABLE t1(x INTEGER PRIMARY KEY, y);"
       "INSERT INTO t1(y) VALUES('abcdefghijklmnopqrstuvwxyz');"
       "INSERT INTO t1(y) VALUES('abcdefghijklmnopqrstuvwxyz');"
       "INSERT INTO t1(y) SELECT y FROM t1;" /* 4 */
       "INSERT INTO t1(y) SELECT y FROM t1;" /* 8 */
       "INSERT INTO t1(y) SELECT y FROM t1;" /* 16 */
       "INSERT INTO t1(y) SELECT y FROM t1;" /* 32 */
       "INSERT INTO t1(y) SELECT y FROM t1;" /* 64 */
       "INSERT INTO t1(y) SELECT y FROM t1;" /* 128 */
       "INSERT INTO t1(y) SELECT y FROM t1;" /* 256 */
       "INSERT INTO t1(y) SELECT y FROM t1;" /* 512 */
       "INSERT INTO t1(y) SELECT y FROM t1;" /* 1024 */
       "UPDATE t1 SET y=(y || x);"
       "CREATE INDEX t1y ON t1(y);"
       "COMMIT;"
    );
    sqlite3_close(db);
  }else if( strcmp(argv[1], "check")==0 ){
    db = openDb(argv[argc-1]);
    runSql(db, "PRAGMA integrity_check");
    if( strcmp(zReply, "ok")!=0 ){
      fprintf(stderr, "Integrity check: %s\n", zReply);
      exit(1);
    }
    runSql(db, 
      "SELECT count(*) FROM t1 WHERE y<>('abcdefghijklmnopqrstuvwxyz' || x)"
    );
    if( strcmp(zReply, "0")!=0 ){
      fprintf(stderr, "Wrong content\n");
      exit(1);
    }
    printf("Ok\n");
  }else if( strcmp(argv[1], "crash")==0 ){
    db = openDb(argv[argc-1]);
    for(i=2; i<argc-1; i++){
      if( strcmp(argv[i],"-wal")==0 ){
        runSql(db, "PRAGMA journal_mode=WAL");
      }else if( strcmp(argv[i], "-rollback")==0 ){
        runSql(db, "PRAGMA journal_mode=DELETE");
      }else{
        fprintf(stderr, "unknown option %s\n", argv[i]);
        usage(argv[0]);
      }
    }
    runSql(db,
      "PRAGMA cache_size=10;"
      "BEGIN;"
      "UPDATE t1 SET y=(y || -x)"
    );
    exit(0);
  }else{
    usage(argv[0]);
  }
  return 0;
}