SQLite

Check-in [a16ffb5a4b]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Ensure that the sqlite3_exec() callback gets the correct number of columns for a query, even if the schema changes out from under it.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA3-256: a16ffb5a4b30f1ac4a8384fccde0a0f69e49545b6f9be9267928609328c4a151
User & Date: drh 2019-02-04 19:12:54.437
Context
2019-02-04
19:45
Enhance dbfuzz2 so that with the -v option it shows the return code and error message for any failing SQL statements. (check-in: 3a127ef9f7 user: drh tags: trunk)
19:12
Ensure that the sqlite3_exec() callback gets the correct number of columns for a query, even if the schema changes out from under it. (check-in: a16ffb5a4b user: drh tags: trunk)
16:42
Do not run shmlock.test as part of the inmemory_journal permutation. (check-in: d3fea69cbb user: dan tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/legacy.c.
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75

76
77
78
79
80
81
82

  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
  if( zSql==0 ) zSql = "";

  sqlite3_mutex_enter(db->mutex);
  sqlite3Error(db, SQLITE_OK);
  while( rc==SQLITE_OK && zSql[0] ){
    int nCol;
    char **azVals = 0;

    pStmt = 0;
    rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zLeftover);
    assert( rc==SQLITE_OK || pStmt==0 );
    if( rc!=SQLITE_OK ){
      continue;
    }
    if( !pStmt ){
      /* this happens for a comment or white-space */
      zSql = zLeftover;
      continue;
    }

    callbackIsInit = 0;
    nCol = sqlite3_column_count(pStmt);

    while( 1 ){
      int i;
      rc = sqlite3_step(pStmt);

      /* Invoke the callback function if required */
      if( xCallback && (SQLITE_ROW==rc || 
          (SQLITE_DONE==rc && !callbackIsInit
                           && db->flags&SQLITE_NullCallback)) ){
        if( !callbackIsInit ){

          azCols = sqlite3DbMallocRaw(db, (2*nCol+1)*sizeof(const char*));
          if( azCols==0 ){
            goto exec_out;
          }
          for(i=0; i<nCol; i++){
            azCols[i] = (char *)sqlite3_column_name(pStmt, i);
            /* sqlite3VdbeSetColName() installs column names as UTF8







|













<

<










>







42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62

63

64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81

  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
  if( zSql==0 ) zSql = "";

  sqlite3_mutex_enter(db->mutex);
  sqlite3Error(db, SQLITE_OK);
  while( rc==SQLITE_OK && zSql[0] ){
    int nCol = 0;
    char **azVals = 0;

    pStmt = 0;
    rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zLeftover);
    assert( rc==SQLITE_OK || pStmt==0 );
    if( rc!=SQLITE_OK ){
      continue;
    }
    if( !pStmt ){
      /* this happens for a comment or white-space */
      zSql = zLeftover;
      continue;
    }

    callbackIsInit = 0;


    while( 1 ){
      int i;
      rc = sqlite3_step(pStmt);

      /* Invoke the callback function if required */
      if( xCallback && (SQLITE_ROW==rc || 
          (SQLITE_DONE==rc && !callbackIsInit
                           && db->flags&SQLITE_NullCallback)) ){
        if( !callbackIsInit ){
          nCol = sqlite3_column_count(pStmt);
          azCols = sqlite3DbMallocRaw(db, (2*nCol+1)*sizeof(const char*));
          if( azCols==0 ){
            goto exec_out;
          }
          for(i=0; i<nCol; i++){
            azCols[i] = (char *)sqlite3_column_name(pStmt, i);
            /* sqlite3VdbeSetColName() installs column names as UTF8