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Overview
Comment:Improve test coverage of ota code a bit.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | ota-update
Files: files | file ages | folders
SHA1: a438fa6c9ad2fb1d78ac747172d07455d6381387
User & Date: dan 2015-02-17 20:49:42
Context
2015-02-18
17:40
Fix a problem with OTA updates in the presence of database readers. (check-in: 144bb29f user: dan tags: ota-update)
2015-02-17
20:49
Improve test coverage of ota code a bit. (check-in: a438fa6c user: dan tags: ota-update)
2015-02-16
21:13
Add extra tests and fixes for ota. (check-in: e0b71519 user: dan tags: ota-update)
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to ext/ota/otafault.test. 

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if {![info exists testdir]} {
  set testdir [file join [file dirname [info script]] .. .. test]
}
source $testdir/tester.tcl
source $testdir/malloc_common.tcl
set ::testprefix otafault

do_test 1.1 {



  forcedelete ota.db
  execsql {
    PRAGMA encoding = utf16;





    CREATE TABLE t1(a INTEGER PRIMARY KEY, b, c);
    CREATE INDEX t1cb ON t1(c, b);
    INSERT INTO t1 VALUES(1, 1, 1);
    INSERT INTO t1 VALUES(2, 2, 2);
    INSERT INTO t1 VALUES(3, 3, 3);








    CREATE TABLE t2(a PRIMARY KEY, b, c) WITHOUT ROWID;
    CREATE INDEX t2cb ON t1(c, b);
    INSERT INTO t2 VALUES('a', 'a', 'a');
    INSERT INTO t2 VALUES('b', 'b', 'b');
    INSERT INTO t2 VALUES('c', 'c', 'c');

    ATTACH 'ota.db' AS ota;
    CREATE TABLE ota.data_t1(a, b, c, ota_control);
    CREATE TABLE ota.data_t2(a, b, c, ota_control);













    INSERT INTO data_t1 VALUES(2, NULL, NULL, 1);
    INSERT INTO data_t1 VALUES(3, 'three', NULL, '.x.');
    INSERT INTO data_t1 VALUES(4, 4, 4, 0);


    INSERT INTO data_t2 VALUES('b', NULL, NULL, 1);
    INSERT INTO data_t2 VALUES('c', 'see', NULL, '.x.');
    INSERT INTO data_t2 VALUES('d', 'd', 'd', 0);







  }

  db close

  forcecopy test.db test.db.bak
  forcecopy ota.db ota.db.bak
} {}

sqlite3_shutdown
set lookaside_config [sqlite3_config_lookaside 0 0]
sqlite3_initialize
autoinstall_test_functions

foreach {tn f reslist} {
  1 oom-tra*  {
    {0 SQLITE_DONE} 
    {1 {SQLITE_NOMEM - out of memory}} 
    {1 SQLITE_NOMEM} 
    {1 SQLITE_IOERR_NOMEM} 
    {1 {SQLITE_NOMEM - unable to open a temporary database file for storing temporary tables}}
  }

  2 ioerr-*  {
    {0 SQLITE_DONE} 
    {1 {SQLITE_IOERR - disk I/O error}}
    {1 SQLITE_IOERR}
    {1 SQLITE_IOERR_WRITE}
    {1 SQLITE_IOERR_READ}
    {1 SQLITE_IOERR_FSYNC}
    {1 {SQLITE_ERROR - SQL logic error or missing database}}
    {1 {SQLITE_ERROR - unable to open database: ota.db}}
    {1 {SQLITE_IOERR - unable to open database: ota.db}}
  }
} {







  do_faultsim_test 2 -faults $::f -prep {
    catch { db close }
    forcedelete test.db-journal test.db-wal ota.db-journal ota.db-wal
    forcecopy test.db.bak test.db
    forcecopy ota.db.bak  ota.db
  } -body {
    sqlite3ota ota test.db ota.db
    while {[ota step]=="SQLITE_OK"} {}
    ota close
  } -test {
    faultsim_test_result {*}$::reslist
    if {$testrc==0} {
      sqlite3 db test.db
      faultsim_integrity_check
      set res [db eval {
        SELECT * FROM t1 UNION ALL SELECT * FROM t2;
      }]
      set expected [list {*}{
        1 1 1   3 three 3   4 4 4
        a a a   c see c     d d d
      }]
  
      if {$res != $expected} {
        puts ""
        puts "res: $res"
        puts "exp: $expected"
        error "data not as expected!"
      }
    }
  }
}

catch {db close}
sqlite3_shutdown
sqlite3_config_lookaside {*}$lookaside_config
sqlite3_initialize
autoinstall_test_functions

proc copy_if_exists {src target} {
  if {[file exists $src]} {
    forcecopy $src $target
  } else {
    forcedelete $target
  }
}

for {set iStep 0} {$iStep<=21} {incr iStep} {

  forcedelete test.db-journal test.db-wal ota.db-journal ota.db-wal

  copy_if_exists test.db.bak test.db
  copy_if_exists ota.db.bak ota.db

  sqlite3ota ota test.db ota.db
  for {set x 0} {$x < $::iStep} {incr x} { ota step }
  ota close

  copy_if_exists test.db test.db.bak.2
  copy_if_exists test.db-wal test.db.bak.2-wal
  copy_if_exists test.db-oal test.db.bak.2-oal
  copy_if_exists ota.db ota.db.bak.2

  do_faultsim_test 3.$iStep -faults oom-trans* -prep {
    catch { db close }
    forcedelete test.db-journal test.db-wal ota.db-journal ota.db-wal
    copy_if_exists test.db.bak.2 test.db
    copy_if_exists test.db.bak.2-wal test.db-wal
    copy_if_exists test.db.bak.2-oal test.db-oal
    copy_if_exists ota.db.bak.2  ota.db
  } -body {
    sqlite3ota ota test.db ota.db
    while {[ota step] == "SQLITE_OK"} {}
    ota close
  } -test {
    faultsim_test_result {0 SQLITE_DONE} \
                         {1 {SQLITE_NOMEM - out of memory}} \
                         {1 SQLITE_NOMEM} \
                         {1 SQLITE_IOERR_NOMEM} \
                         {1 {SQLITE_NOMEM - unable to open a temporary database file for storing temporary tables}}
  
    if {$testrc==0} {
      sqlite3 db test.db
      faultsim_integrity_check
      set res [db eval {
        SELECT * FROM t1 UNION ALL SELECT * FROM t2;
      }]
      set expected [list {*}{
        1 1 1   3 three 3   4 4 4
        a a a   c see c     d d d
      }]
  
      if {$res != $expected} {
        puts ""
        puts "res: $res"
        puts "exp: $expected"
        error "data not as expected!"
      }
    }
  }

}

finish_test









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if {![info exists testdir]} {
  set testdir [file join [file dirname [info script]] .. .. test]
}
source $testdir/tester.tcl
source $testdir/malloc_common.tcl
set ::testprefix otafault

proc copy_if_exists {src target} {
  if {[file exists $src]} {
    forcecopy $src $target
  } else {
    forcedelete $target


  }
}

foreach {tn2 setup sql expect} {
  1 {
    CREATE TABLE t1(a INTEGER PRIMARY KEY, b, c);
    CREATE INDEX t1cb ON t1(c, b);
    INSERT INTO t1 VALUES(1, 1, 1);
    INSERT INTO t1 VALUES(2, 2, 2);
    INSERT INTO t1 VALUES(3, 3, 3);

    CREATE TABLE ota.data_t1(a, b, c, ota_control);
    INSERT INTO data_t1 VALUES(2, NULL, NULL, 1);
    INSERT INTO data_t1 VALUES(3, 'three', NULL, '.x.');
    INSERT INTO data_t1 VALUES(4, 4, 4, 0);
  } {SELECT * FROM t1} {1 1 1   3 three 3   4 4 4}

  2 {
    CREATE TABLE t2(a PRIMARY KEY, b, c) WITHOUT ROWID;
    CREATE INDEX t2cb ON t2(c, b);
    INSERT INTO t2 VALUES('a', 'a', 'a');
    INSERT INTO t2 VALUES('b', 'b', 'b');
    INSERT INTO t2 VALUES('c', 'c', 'c');



    CREATE TABLE ota.data_t2(a, b, c, ota_control);
    INSERT INTO data_t2 VALUES('b', NULL, NULL, 1);
    INSERT INTO data_t2 VALUES('c', 'see', NULL, '.x.');
    INSERT INTO data_t2 VALUES('d', 'd', 'd', 0);
  } {SELECT * FROM t2} {a a a   c see c     d d d}

  3 {
    CREATE TABLE t1(a INTEGER PRIMARY KEY, b, c);
    CREATE TABLE t2(a PRIMARY KEY, b, c) WITHOUT ROWID;
    CREATE INDEX t1cb ON t1(c, b);
    CREATE INDEX t2cb ON t2(c, b);

    CREATE TABLE ota.data_t1(a, b, c, ota_control);
    CREATE TABLE ota.data_t2(a, b, c, ota_control);
    INSERT INTO data_t1 VALUES(1, 2, 3, 0);

    INSERT INTO data_t2 VALUES(4, 5, 6, 0);
  } {SELECT * FROM t1 UNION ALL SELECT * FROM t2} {1 2 3 4 5 6}




} {
  catch {db close}
  forcedelete ota.db test.db
  sqlite3 db test.db
  execsql {
    PRAGMA encoding = utf16;
    ATTACH 'ota.db' AS ota;
  }
  execsql $setup
  db close

  forcecopy test.db test.db.bak
  forcecopy ota.db ota.db.bak







  foreach {tn f reslist} {
    1 oom-tra*  {
      {0 SQLITE_DONE} 
      {1 {SQLITE_NOMEM - out of memory}} 
      {1 SQLITE_NOMEM} 
      {1 SQLITE_IOERR_NOMEM} 
      {1 {SQLITE_NOMEM - unable to open a temporary database file for storing temporary tables}}
    }
  
    2 ioerr-*  {
      {0 SQLITE_DONE} 
      {1 {SQLITE_IOERR - disk I/O error}}
      {1 SQLITE_IOERR}
      {1 SQLITE_IOERR_WRITE}
      {1 SQLITE_IOERR_READ}
      {1 SQLITE_IOERR_FSYNC}
      {1 {SQLITE_ERROR - SQL logic error or missing database}}
      {1 {SQLITE_ERROR - unable to open database: ota.db}}
      {1 {SQLITE_IOERR - unable to open database: ota.db}}
    }
  } {

    catch {db close}
    sqlite3_shutdown
    set lookaside_config [sqlite3_config_lookaside 0 0]
    sqlite3_initialize
    autoinstall_test_functions

    do_faultsim_test 2.$tn2 -faults $::f -prep {
      catch { db close }
      forcedelete test.db-journal test.db-wal ota.db-journal ota.db-wal
      forcecopy test.db.bak test.db
      forcecopy ota.db.bak  ota.db
    } -body {
      sqlite3ota ota test.db ota.db
      while {[ota step]=="SQLITE_OK"} {}
      ota close
    } -test {
      faultsim_test_result {*}$::reslist
      if {$testrc==0} {
        sqlite3 db test.db
        faultsim_integrity_check
        set res [db eval $::sql]







        if {$res != [list {*}$::expect]} {
          puts ""
          puts "res: $res"
          puts "exp: $expect"
          error "data not as expected!"
        }
      }
    }


    catch {db close}
    sqlite3_shutdown
    sqlite3_config_lookaside {*}$lookaside_config
    sqlite3_initialize
    autoinstall_test_functions







  }

  for {set iStep 0} {$iStep<=21} {incr iStep} {
  
    forcedelete test.db-journal test.db-wal ota.db-journal ota.db-wal
  
    copy_if_exists test.db.bak test.db
    copy_if_exists ota.db.bak ota.db
  
    sqlite3ota ota test.db ota.db
    for {set x 0} {$x < $::iStep} {incr x} { ota step }
    ota close
  
    copy_if_exists test.db test.db.bak.2
    copy_if_exists test.db-wal test.db.bak.2-wal
    copy_if_exists test.db-oal test.db.bak.2-oal
    copy_if_exists ota.db ota.db.bak.2
  
    do_faultsim_test 3.$tn.$iStep -faults $::f -prep {
      catch { db close }
      forcedelete test.db-journal test.db-wal ota.db-journal ota.db-wal
      copy_if_exists test.db.bak.2 test.db
      copy_if_exists test.db.bak.2-wal test.db-wal
      copy_if_exists test.db.bak.2-oal test.db-oal
      copy_if_exists ota.db.bak.2  ota.db
    } -body {
      sqlite3ota ota test.db ota.db
      while {[ota step] == "SQLITE_OK"} {}
      ota close
    } -test {
      faultsim_test_result {*}$::reslist




    
      if {$testrc==0} {
        sqlite3 db test.db
        faultsim_integrity_check
        set res [db eval $::sql]







        if {$res != [list {*}$::expect]} {
          puts ""
          puts "res: $res"
          puts "exp: $expected"
          error "data not as expected!"
        }
      }
    }
  }
}

finish_test

Changes to ext/ota/sqlite3ota.c. 

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**     }
**   }else if( "PRAGMA table_info()" lists one or more "pk" columns ){
**     return OTA_PK_IPK
**   }else{
**     return OTA_PK_NONE
**   }
*/
static int otaTableType(
  sqlite3 *db,
  const char *zTab,
  int *peType,
  int *piPk
){
  sqlite3_stmt *pStmt = 0;
  int rc = SQLITE_OK;
  int rc2;
  char *zSql = 0;




  *peType = OTA_PK_NOTABLE;
  *piPk = 0;
  zSql = sqlite3_mprintf(
          "SELECT (sql LIKE 'create virtual%%')"
          "  FROM main.sqlite_master"
          " WHERE name=%Q", zTab);
  if( zSql==0 ) return SQLITE_NOMEM;
  rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
  sqlite3_free(zSql);
  zSql = 0;
  if( pStmt==0 ) goto otaTableType_end;
  if( sqlite3_step(pStmt)!=SQLITE_ROW ){
     goto otaTableType_end;                    /* no such table */
  }
  if( sqlite3_column_int(pStmt,0) ){
    *peType = OTA_PK_VTAB;                     /* virtual table */
    goto otaTableType_end;
  }
  rc = sqlite3_finalize(pStmt);
  if( rc ) return rc;
  zSql = sqlite3_mprintf("PRAGMA index_list=%Q",zTab);
  if( zSql==0 ) return SQLITE_NOMEM;
  rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
  sqlite3_free(zSql);
  zSql = 0;
  if( pStmt==0 ) goto otaTableType_end;
  while( sqlite3_step(pStmt)==SQLITE_ROW ){
    const u8 *zOrig = sqlite3_column_text(pStmt,3);
    if( zOrig && zOrig[0]=='p' ){
      zSql = sqlite3_mprintf("SELECT rootpage FROM main.sqlite_master"
                             " WHERE name=%Q", sqlite3_column_text(pStmt,1));
      if( zSql==0 ){ rc = SQLITE_NOMEM; goto otaTableType_end; }
      break;
    }
  }
  rc = sqlite3_finalize(pStmt);
  pStmt = 0;
  if( rc ) return rc;
  if( zSql ){
    rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
    sqlite3_free(zSql);
    zSql = 0;
    if( pStmt==0 ) goto otaTableType_end;
    if( sqlite3_step(pStmt)==SQLITE_ROW ){
      *piPk = sqlite3_column_int(pStmt, 0);
      *peType = OTA_PK_EXTERNAL;             /* external PK index */
    }else{
      *peType = OTA_PK_WITHOUT_ROWID;        /* WITHOUT ROWID table */
    }
  }else{
    zSql = sqlite3_mprintf("PRAGMA table_info=%Q", zTab);
    if( zSql==0 ) return SQLITE_NOMEM;
    rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
    sqlite3_free(zSql);
    zSql = 0;
    if( pStmt==0 ) goto otaTableType_end;
    *peType = OTA_PK_NONE;                   /* (default) implicit ROWID */
    while( sqlite3_step(pStmt)==SQLITE_ROW ){
      if( sqlite3_column_int(pStmt,5)>0 ){
        *peType = OTA_PK_IPK;                /* explicit IPK column */
        break;
      }
    }
  }

otaTableType_end:
  sqlite3_free(zSql);
  rc2 = sqlite3_finalize(pStmt);
  return rc ? rc : rc2;
}


/*
** If they are not already populated, populate the pIter->azTblCol[],
** pIter->abTblPk[], pIter->nTblCol and pIter->bRowid variables according to
** the table (not index) that the iterator currently points to.
................................................................................
    int i;                        /* for() loop iterator variable */
    int rc2;                      /* sqlite3_finalize() return value */
    int bOtaRowid = 0;            /* If input table has column "ota_rowid" */
    int iOrder = 0;

    /* Figure out the type of table this step will deal with. */
    assert( pIter->eType==0 );
    p->rc = otaTableType(p->db, pIter->zTbl, &pIter->eType, &pIter->iPkTnum);
    if( p->rc ) return p->rc;

    assert( pIter->eType==OTA_PK_NONE || pIter->eType==OTA_PK_IPK 
         || pIter->eType==OTA_PK_EXTERNAL || pIter->eType==OTA_PK_WITHOUT_ROWID
         || pIter->eType==OTA_PK_VTAB
    );

................................................................................
        }
        break;
      }
    }
    rc = sqlite3_finalize(pXList);
    if( p->rc==SQLITE_OK ) p->rc = rc;

    while( p->rc==SQLITE_OK && pXInfo && SQLITE_ROW==sqlite3_step(pXInfo) ){
      if( sqlite3_column_int(pXInfo, 5) ){
        /* int iCid = sqlite3_column_int(pXInfo, 0); */
        const char *zCol = (const char*)sqlite3_column_text(pXInfo, 2);
        const char *zDesc = sqlite3_column_int(pXInfo, 3) ? " DESC" : "";
        z = otaMPrintf(p, "%z%s\"%w\"%s", z, zSep, zCol, zDesc);
        zSep = ", ";
      }
................................................................................
    z = otaMPrintf(p, "%z)", z);
    rc = sqlite3_finalize(pXInfo);
    if( p->rc==SQLITE_OK ) p->rc = rc;
  }
  return z;
}




















static void otaCreateImposterTable2(sqlite3ota *p, OtaObjIter *pIter){
  if( p->rc==SQLITE_OK && pIter->eType==OTA_PK_EXTERNAL ){
    int tnum = pIter->iPkTnum;    /* Root page of PK index */
    sqlite3_stmt *pQuery = 0;     /* SELECT name ... WHERE rootpage = $tnum */
    const char *zIdx = 0;         /* Name of PK index */
    sqlite3_stmt *pXInfo = 0;     /* PRAGMA main.index_xinfo = $zIdx */
    int rc;








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**     }
**   }else if( "PRAGMA table_info()" lists one or more "pk" columns ){
**     return OTA_PK_IPK
**   }else{
**     return OTA_PK_NONE
**   }
*/
static void otaTableType(
  sqlite3ota *p,
  const char *zTab,
  int *peType,
  int *piPk
){
  /*
  ** 0) SELECT count(*) FROM sqlite_master where name=%Q AND IsVirtual(%Q)
  ** 1) PRAGMA index_list = ?
  ** 2) SELECT count(*) FROM sqlite_master where name=%Q 
  ** 3) PRAGMA table_info = ?
  */
  sqlite3_stmt *aStmt[4] = {0, 0, 0, 0};

  *peType = OTA_PK_NOTABLE;
  *piPk = 0;

  assert( p->rc==SQLITE_OK );
  p->rc = prepareFreeAndCollectError(p->db, &aStmt[0], &p->zErrmsg, 
    sqlite3_mprintf(
          "SELECT (sql LIKE 'create virtual%%')"
          "  FROM sqlite_master"
          " WHERE name=%Q", zTab
  ));
  if( p->rc!=SQLITE_OK || sqlite3_step(aStmt[0])!=SQLITE_ROW ){
    /* Either an error, or no such table. */
    goto otaTableType_end;
  }
  if( sqlite3_column_int(aStmt[0], 0) ){
    *peType = OTA_PK_VTAB;                     /* virtual table */
    goto otaTableType_end;
  }

  p->rc = prepareFreeAndCollectError(p->db, &aStmt[1], &p->zErrmsg, 
    sqlite3_mprintf("PRAGMA index_list=%Q",zTab)
  );
  if( p->rc ) goto otaTableType_end;
  while( sqlite3_step(aStmt[1])==SQLITE_ROW ){
    const u8 *zOrig = sqlite3_column_text(aStmt[1], 3);
    const u8 *zIdx = sqlite3_column_text(aStmt[1], 1);
    if( zOrig && zIdx && zOrig[0]=='p' ){
      p->rc = prepareFreeAndCollectError(p->db, &aStmt[2], &p->zErrmsg, 
          sqlite3_mprintf(
            "SELECT rootpage FROM sqlite_master WHERE name = %Q", zIdx
      ));
      if( p->rc==SQLITE_OK ){
        if( sqlite3_step(aStmt[2])==SQLITE_ROW ){
          *piPk = sqlite3_column_int(aStmt[2], 0);
          *peType = OTA_PK_EXTERNAL;
        }else{
          *peType = OTA_PK_WITHOUT_ROWID;
        }
      }
      goto otaTableType_end;
    }
  }

  p->rc = prepareFreeAndCollectError(p->db, &aStmt[3], &p->zErrmsg, 
    sqlite3_mprintf("PRAGMA table_info=%Q",zTab)
  );
  if( p->rc==SQLITE_OK ){
    while( sqlite3_step(aStmt[3])==SQLITE_ROW ){
      if( sqlite3_column_int(aStmt[3],5)>0 ){
        *peType = OTA_PK_IPK;                /* explicit IPK column */
        goto otaTableType_end;
      }
    }
    *peType = OTA_PK_NONE;
  }

otaTableType_end: {
    int i;
    for(i=0; i<sizeof(aStmt)/sizeof(aStmt[0]); i++){
      int rc2 = sqlite3_finalize(aStmt[i]);
      if( p->rc==SQLITE_OK ) p->rc = rc2;
    }
  }






}


/*
** If they are not already populated, populate the pIter->azTblCol[],
** pIter->abTblPk[], pIter->nTblCol and pIter->bRowid variables according to
** the table (not index) that the iterator currently points to.
................................................................................
    int i;                        /* for() loop iterator variable */
    int rc2;                      /* sqlite3_finalize() return value */
    int bOtaRowid = 0;            /* If input table has column "ota_rowid" */
    int iOrder = 0;

    /* Figure out the type of table this step will deal with. */
    assert( pIter->eType==0 );
    otaTableType(p, pIter->zTbl, &pIter->eType, &pIter->iPkTnum);
    if( p->rc ) return p->rc;

    assert( pIter->eType==OTA_PK_NONE || pIter->eType==OTA_PK_IPK 
         || pIter->eType==OTA_PK_EXTERNAL || pIter->eType==OTA_PK_WITHOUT_ROWID
         || pIter->eType==OTA_PK_VTAB
    );

................................................................................
        }
        break;
      }
    }
    rc = sqlite3_finalize(pXList);
    if( p->rc==SQLITE_OK ) p->rc = rc;

    while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
      if( sqlite3_column_int(pXInfo, 5) ){
        /* int iCid = sqlite3_column_int(pXInfo, 0); */
        const char *zCol = (const char*)sqlite3_column_text(pXInfo, 2);
        const char *zDesc = sqlite3_column_int(pXInfo, 3) ? " DESC" : "";
        z = otaMPrintf(p, "%z%s\"%w\"%s", z, zSep, zCol, zDesc);
        zSep = ", ";
      }
................................................................................
    z = otaMPrintf(p, "%z)", z);
    rc = sqlite3_finalize(pXInfo);
    if( p->rc==SQLITE_OK ) p->rc = rc;
  }
  return z;
}

/*
** This function creates the second imposter table used when writing to
** a table b-tree where the table has an external primary key. If the
** iterator passed as the second argument does not currently point to
** a table (not index) with an external primary key, this function is a
** no-op. 
**
** Assuming the iterator does point to a table with an external PK, this
** function creates a WITHOUT ROWID imposter table named "ota_imposter2"
** used to access that PK index. For example, if the target table is
** declared as follows:
**
**   CREATE TABLE t1(a, b TEXT, c REAL, PRIMARY KEY(b, c));
**
** then the imposter table schema is:
**
**   CREATE TABLE ota_imposter2(c1 TEXT, c2 REAL, id INTEGER) WITHOUT ROWID;
**
*/
static void otaCreateImposterTable2(sqlite3ota *p, OtaObjIter *pIter){
  if( p->rc==SQLITE_OK && pIter->eType==OTA_PK_EXTERNAL ){
    int tnum = pIter->iPkTnum;    /* Root page of PK index */
    sqlite3_stmt *pQuery = 0;     /* SELECT name ... WHERE rootpage = $tnum */
    const char *zIdx = 0;         /* Name of PK index */
    sqlite3_stmt *pXInfo = 0;     /* PRAGMA main.index_xinfo = $zIdx */
    int rc;

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