SQLite

      zSql = sqlite3_mprintf(azSql[eStmt], p->zReadExprlist);
    }else{
      zSql = sqlite3_mprintf(azSql[eStmt], p->zDb, p->zName);
    }
    if( !zSql ){
      rc = SQLITE_NOMEM;
    }else{
      rc = sqlite3_prepare_v3(p->db, zSql, -1,
                              SQLITE_PREPARE_PERSISTENT | SQLITE_PREPARE_SHADOW,
                              &pStmt, NULL);
      sqlite3_free(zSql);
      assert( rc==SQLITE_OK || pStmt==0 );
      p->aStmt[eStmt] = pStmt;
    }
  }
  if( apVal ){

  Fts5Index *p,
  sqlite3_stmt **ppStmt,
  char *zSql
){
  if( p->rc==SQLITE_OK ){
    if( zSql ){
      p->rc = sqlite3_prepare_v3(p->pConfig->db, zSql, -1,
                                SQLITE_PREPARE_PERSISTENT|SQLITE_PREPARE_SHADOW,
                                ppStmt, 0);
    }else{
      p->rc = SQLITE_NOMEM;
    }
  }
  sqlite3_free(zSql);
  return p->rc;
}

        "DELETE FROM '%q'.'%q_data' WHERE id>=? AND id<=?", 
          pConfig->zDb, pConfig->zName
    );
    if( zSql==0 ){
      rc = SQLITE_NOMEM;
    }else{
      rc = sqlite3_prepare_v3(pConfig->db, zSql, -1,
                              SQLITE_PREPARE_PERSISTENT|SQLITE_PREPARE_SHADOW,
                              &p->pDeleter, 0);
      sqlite3_free(zSql);
    }
    if( rc!=SQLITE_OK ){
      p->rc = rc;
      return;
    }
  }

  va_start(ap, zFmt);
  zSql = sqlite3_vmprintf(zFmt, ap);
  if( zSql==0 ){
    rc = SQLITE_NOMEM; 
  }else{
    rc = sqlite3_prepare_v3(pConfig->db, zSql, -1, 
                            SQLITE_PREPARE_PERSISTENT |SQLITE_PREPARE_SHADOW,
                            &pRet, 0);
    if( rc!=SQLITE_OK ){
      *pConfig->pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(pConfig->db));
    }
    sqlite3_free(zSql);
  }

  va_end(ap);

        break;
    }

    if( zSql==0 ){
      rc = SQLITE_NOMEM;
    }else{
      rc = sqlite3_prepare_v3(pC->db, zSql, -1,
                              SQLITE_PREPARE_PERSISTENT|SQLITE_PREPARE_SHADOW,
                              &p->aStmt[eStmt], 0);
      sqlite3_free(zSql);
      if( rc!=SQLITE_OK && pzErrMsg ){
        *pzErrMsg = sqlite3_mprintf("%s", sqlite3_errmsg(pC->db));
      }
    }
  }

       /* An UPSERT is very slightly slower than REPLACE, but it is needed
       ** if there are auxiliary columns */
       zFormat = "INSERT INTO\"%w\".\"%w_rowid\"(rowid,nodeno)VALUES(?1,?2)"
                  "ON CONFLICT(rowid)DO UPDATE SET nodeno=excluded.nodeno";
    }
    zSql = sqlite3_mprintf(zFormat, zDb, zPrefix);
    if( zSql ){
      rc = sqlite3_prepare_v3(db, zSql, -1,
                              SQLITE_PREPARE_PERSISTENT | SQLITE_PREPARE_SHADOW,
                              appStmt[i], 0); 
    }else{
      rc = SQLITE_NOMEM;
    }
    sqlite3_free(zSql);
  }
  if( pRtree->nAux ){

  /* A table is not writable under the following circumstances:
  **
  **   1) It is a virtual table and no implementation of the xUpdate method
  **      has been provided, or
  **   2) It is a system table (i.e. sqlite_master), this call is not
  **      part of a nested parse and writable_schema pragma has not 
  **      been specified.
  **   3) The table is a shadow table and the SQLITE_PREPARE_SHADOW flag

  **      is omitted.
  **
  ** In either case leave an error message in pParse and return non-zero.
  */
  if( ( IsVirtual(pTab) 
     && sqlite3GetVTable(pParse->db, pTab)->pMod->pModule->xUpdate==0 )
   || ( (pTab->tabFlags & TF_Readonly)!=0
     && sqlite3WritableSchema(pParse->db)==0
     && pParse->nested==0)
   || ( (pTab->tabFlags & TF_Shadow)!=0
     && pParse->writeShadow==0)
  ){
    sqlite3ErrorMsg(pParse, "table %s may not be modified", pTab->zName);
    return 1;
  }

#ifndef SQLITE_OMIT_VIEW
  if( !viewOk && pTab->pSelect ){

  /* For a long-term use prepared statement avoid the use of
  ** lookaside memory.
  */
  if( prepFlags & SQLITE_PREPARE_PERSISTENT ){
    sParse.disableLookaside++;
    db->lookaside.bDisable++;
  }
  if( prepFlags & SQLITE_PREPARE_SHADOW ){
    sParse.writeShadow = 1;
  }

  /* Check to verify that it is possible to get a read lock on all
  ** database schemas.  The inability to get a read lock indicates that
  ** some other database connection is holding a write-lock, which in
  ** turn means that the other connection has made uncommitted changes
  ** to the schema.
  **

** <dd>The SQLITE_PREPARE_NORMALIZE flag indicates that a normalized
** representation of the SQL statement should be calculated and then
** associated with the prepared statement, which can be obtained via
** the [sqlite3_normalized_sql()] interface.  The semantics used to
** normalize a SQL statement are unspecified and subject to change.
** At a minimum, literal values will be replaced with suitable
** placeholders.
**
** [[SQLITE_PREPARE_SHADOW]] ^(<dt>SQLITE_PREPARE_SHADOW</dt>
** <dd>When the SQLITE_PREPARE_SHADOW flag is set, writes to shadow
** tables are allowed.  Shadow tables are ordinary tables associated
** with some virtual tables that serve as the storage for the virtual
** table.  Shadow tables are normally read-only.  Virtual table
** implementations use this flag so that they can write to their own
** shadow tables.
** </dl>
*/
#define SQLITE_PREPARE_PERSISTENT              0x01
#define SQLITE_PREPARE_NORMALIZE               0x02
#define SQLITE_PREPARE_SHADOW                  0x04

/*
** CAPI3REF: Compiling An SQL Statement
** KEYWORDS: {SQL statement compiler}
** METHOD: sqlite3
** CONSTRUCTOR: sqlite3_stmt
**

  int addrCrTab;       /* Address of OP_CreateBtree opcode on CREATE TABLE */
  u32 nQueryLoop;      /* Est number of iterations of a query (10*log2(N)) */
  u32 oldmask;         /* Mask of old.* columns referenced */
  u32 newmask;         /* Mask of new.* columns referenced */
  u8 eTriggerOp;       /* TK_UPDATE, TK_INSERT or TK_DELETE */
  u8 eOrconf;          /* Default ON CONFLICT policy for trigger steps */
  u8 disableTriggers;  /* True to disable triggers */
  u8 writeShadow;      /* True if shadow tables are writable */

  /**************************************************************************
  ** Fields above must be initialized to zero.  The fields that follow,
  ** down to the beginning of the recursive section, do not need to be
  ** initialized as they will be set before being used.  The boundary is
  ** determined by offsetof(Parse,aTempReg).
  **************************************************************************/