SQLite

  /* TODO: It would be better to have some system for reusing statement
  ** handles here, rather than preparing a new one for each query. But that
  ** is not possible as SQLite reference counts the virtual table objects.
  ** And since the statement required here reads from this very virtual 
  ** table, saving it creates a circular reference.
  **
  ** If SQLite a built-in statement cache, this wouldn't be a problem. */
  zSql = sqlite3Fts5Mprintf(&rc, 
      "SELECT rowid, rank FROM %Q.%Q ORDER BY %s(%s%s%s) %s",
      pConfig->zDb, pConfig->zName, zRank, pConfig->zName,
      (zRankArgs ? ", " : ""),
      (zRankArgs ? zRankArgs : ""),
      bDesc ? "DESC" : "ASC"
  );
  if( zSql ){


    rc = sqlite3_prepare_v2(pConfig->db, zSql, -1, &pSorter->pStmt, 0);
    sqlite3_free(zSql);
  }

  pCsr->pSorter = pSorter;
  if( rc==SQLITE_OK ){
    assert( pTab->pSortCsr==0 );

  Fts5Config *pConfig = pTab->pConfig;
  int rc = SQLITE_OK;
  Fts5Auxiliary *pAux = 0;
  const char *zRank = pCsr->zRank;
  const char *zRankArgs = pCsr->zRankArgs;

  if( zRankArgs ){
    char *zSql = sqlite3Fts5Mprintf(&rc, "SELECT %s", zRankArgs);
    if( zSql ){


      sqlite3_stmt *pStmt = 0;
      rc = sqlite3_prepare_v2(pConfig->db, zSql, -1, &pStmt, 0);
      sqlite3_free(zSql);
      assert( rc==SQLITE_OK || pCsr->pRankArgStmt==0 );
      if( rc==SQLITE_OK ){
        if( SQLITE_ROW==sqlite3_step(pStmt) ){
          int nByte;

  return SQLITE_OK;
}

/*
** If the cursor requires seeking (bSeekRequired flag is set), seek it.
** Return SQLITE_OK if no error occurs, or an SQLite error code otherwise.
**
** If argument bErrormsg is true and an error occurs, an error message may
** be left in sqlite3_vtab.zErrMsg.
*/
static int fts5SeekCursor(Fts5Cursor *pCsr, int bErrormsg){
  int rc = SQLITE_OK;

  /* If the cursor does not yet have a statement handle, obtain one now. */ 
  if( pCsr->pStmt==0 ){
    Fts5Table *pTab = (Fts5Table*)(pCsr->base.pVtab);
    int eStmt = fts5StmtType(pCsr);
    rc = sqlite3Fts5StorageStmt(
        pTab->pStorage, eStmt, &pCsr->pStmt, (bErrormsg?&pTab->base.zErrMsg:0)
    );
    assert( rc!=SQLITE_OK || pTab->base.zErrMsg==0 );
    assert( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_CONTENT) );
  }

  if( rc==SQLITE_OK && CsrFlagTest(pCsr, FTS5CSR_REQUIRE_CONTENT) ){
    assert( pCsr->pExpr );
    sqlite3_reset(pCsr->pStmt);
    sqlite3_bind_int64(pCsr->pStmt, 1, fts5CursorRowid(pCsr));

){
  int rc = SQLITE_OK;
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  if( fts5IsContentless((Fts5Table*)(pCsr->base.pVtab)) ){
    *pz = 0;
    *pn = 0;
  }else{
    rc = fts5SeekCursor(pCsr, 0);
    if( rc==SQLITE_OK ){
      *pz = (const char*)sqlite3_column_text(pCsr->pStmt, iCol+1);
      *pn = sqlite3_column_bytes(pCsr->pStmt, iCol+1);
    }
  }
  return rc;
}

     || pCsr->ePlan==FTS5_PLAN_SORTED_MATCH
    ){
      if( pCsr->pRank || SQLITE_OK==(rc = fts5FindRankFunction(pCsr)) ){
        fts5ApiInvoke(pCsr->pRank, pCsr, pCtx, pCsr->nRankArg, pCsr->apRankArg);
      }
    }
  }else if( !fts5IsContentless(pTab) ){
    rc = fts5SeekCursor(pCsr, 1);
    if( rc==SQLITE_OK ){
      sqlite3_result_value(pCtx, sqlite3_column_value(pCsr->pStmt, iCol+1));
    }
  }
  return rc;
}

  if( sqlite3_strnicmp("content", zCmd, nCmd)==0 ){
    if( pConfig->eContent!=FTS5_CONTENT_NORMAL ){
      *pzErr = sqlite3_mprintf("multiple content=... directives");
      rc = SQLITE_ERROR;
    }else{
      if( zArg[0] ){
        pConfig->eContent = FTS5_CONTENT_EXTERNAL;
        pConfig->zContent = sqlite3Fts5Mprintf(&rc, "%Q.%Q", pConfig->zDb,zArg);

      }else{
        pConfig->eContent = FTS5_CONTENT_NONE;
      }
    }
    return rc;
  }

/*
** Call sqlite3_declare_vtab() based on the contents of the configuration
** object passed as the only argument. Return SQLITE_OK if successful, or
** an SQLite error code if an error occurs.
*/
int sqlite3Fts5ConfigDeclareVtab(Fts5Config *pConfig){
  int i;
  int rc = SQLITE_OK;
  char *zSql;
  char *zOld;

  zSql = sqlite3Fts5Mprintf(&rc, "CREATE TABLE x(");
  for(i=0; zSql && i<pConfig->nCol; i++){

    const char *zSep = (i==0?"":", ");
    zSql = sqlite3Fts5Mprintf(&rc, "%z%s%Q", zSql, zSep, pConfig->azCol[i]);
  }



  zSql = sqlite3Fts5Mprintf(&rc, "%z, %Q HIDDEN, %s HIDDEN)", 
      zSql, pConfig->zName, FTS5_RANK_NAME
  );


  assert( zSql || rc==SQLITE_NOMEM );
  if( zSql ){


    rc = sqlite3_declare_vtab(pConfig->db, zSql);
    sqlite3_free(zSql);
  }
  
  return rc;
}

/*
** Load the contents of the %_config table into memory.
*/
int sqlite3Fts5ConfigLoad(Fts5Config *pConfig, int iCookie){
  const char *zSelect = "SELECT k, v FROM %Q.'%q_config'";
  char *zSql;
  sqlite3_stmt *p = 0;
  int rc = SQLITE_OK;
  int iVersion = 0;

  /* Set default values */
  pConfig->pgsz = FTS5_DEFAULT_PAGE_SIZE;
  pConfig->nAutomerge = FTS5_DEFAULT_AUTOMERGE;
  pConfig->nCrisisMerge = FTS5_DEFAULT_CRISISMERGE;

  zSql = sqlite3Fts5Mprintf(&rc, zSelect, pConfig->zDb, pConfig->zName);
  if( zSql ){


    rc = sqlite3_prepare_v2(pConfig->db, zSql, -1, &p, 0);
    sqlite3_free(zSql);
  }

  assert( rc==SQLITE_OK || p==0 );
  if( rc==SQLITE_OK ){
    while( SQLITE_ROW==sqlite3_step(p) ){

/*
** INSERT OR REPLACE a record into the %_data table.
*/
static void fts5DataWrite(Fts5Index *p, i64 iRowid, const u8 *pData, int nData){
  if( p->rc!=SQLITE_OK ) return;

  if( p->pWriter==0 ){
    int rc = SQLITE_OK;
    Fts5Config *pConfig = p->pConfig;
    char *zSql = sqlite3Fts5Mprintf(&rc,
        "REPLACE INTO '%q'.%Q(id, block) VALUES(?,?)", pConfig->zDb, p->zDataTbl
    );
    if( zSql ){


      rc = sqlite3_prepare_v2(pConfig->db, zSql, -1, &p->pWriter, 0);
      sqlite3_free(zSql);
    }
    if( rc!=SQLITE_OK ){
      p->rc = rc;
      return;
    }

  Fts5Index *p;                   /* New object */

  *pp = p = (Fts5Index*)sqlite3Fts5MallocZero(&rc, sizeof(Fts5Index));
  if( rc==SQLITE_OK ){
    p->pConfig = pConfig;
    p->nWorkUnit = FTS5_WORK_UNIT;
    p->nMaxPendingData = 1024*1024;
    p->zDataTbl = sqlite3Fts5Mprintf(&rc, "%s_data", pConfig->zName);
    if( p->zDataTbl && bCreate ){


      rc = sqlite3Fts5CreateTable(
          pConfig, "data", "id INTEGER PRIMARY KEY, block BLOB", 0, pzErr
      );
      if( rc==SQLITE_OK ){
        rc = sqlite3Fts5IndexReinit(p);
      }
    }

  int nCol = 0;
  Fts5VocabCursor *pCsr = 0;
  int rc = SQLITE_OK;
  sqlite3_stmt *pStmt = 0;
  char *zSql = 0;
  int nByte;

  zSql = sqlite3Fts5Mprintf(&rc,
      "SELECT t.%Q FROM %Q.%Q AS t WHERE t.%Q MATCH '*id'",
      pTab->zFts5Tbl, pTab->zFts5Db, pTab->zFts5Tbl, pTab->zFts5Tbl
  );
  if( zSql ){


    rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pStmt, 0);
  }
  sqlite3_free(zSql);
  assert( rc==SQLITE_OK || pStmt==0 );
  if( rc==SQLITE_ERROR ) rc = SQLITE_OK;

  if( pStmt && sqlite3_step(pStmt)==SQLITE_ROW ){

  2 1 { CREATE VIRTUAL TABLE t1 USING fts5(x, columnsize=1) }
  3 0 { CREATE VIRTUAL TABLE t1 USING fts5(x, columnsize='0') }
  4 1 { CREATE VIRTUAL TABLE t1 USING fts5(x, columnsize='1') }
  5 2 { CREATE VIRTUAL TABLE t1 USING fts5(x, columnsize='') }
  6 2 { CREATE VIRTUAL TABLE t1 USING fts5(x, columnsize=2) }
  7 1 { CREATE VIRTUAL TABLE t1 USING fts5(x, columnsize=0, columnsize=1) }
  8 1 { CREATE VIRTUAL TABLE t1 USING fts5(x) }
  9 2 { CREATE VIRTUAL TABLE t1 USING fts5(x, columnsize=11) }
} {
  execsql { 
    DROP TABLE IF EXISTS t1;
  }
  if {$outcome==2} {
    do_catchsql_test 1.$tn.1 $stmt {1 {malformed columnsize=... directive}}
  } else {

}

#-------------------------------------------------------------------------
# Test the xColumnSize() API
#
fts5_aux_test_functions db

do_execsql_test 3.1.0 {
  CREATE VIRTUAL TABLE t3 USING fts5(x, y UNINDEXED, z, columnsize=0);
  INSERT INTO t3 VALUES('a a', 'b b b', 'c');
  INSERT INTO t3 VALUES('x a x', 'b b b y', '');
}
do_execsql_test 3.1.1 {
  SELECT rowid, fts5_test_columnsize(t3) FROM t3 WHERE t3 MATCH 'a'
} {
  1 {2 0 1} 2 {3 0 0}
}
do_execsql_test 3.1.2 {
  INSERT INTO t3 VALUES(NULL, NULL, 'a a a a');
  DELETE FROM t3 WHERE rowid = 1;
  SELECT rowid, fts5_test_columnsize(t3) FROM t3 WHERE t3 MATCH 'a'
} {
  2 {3 0 0} 3 {0 0 4}
}

do_execsql_test 3.2.0 {
  CREATE VIRTUAL TABLE t4 USING fts5(x, y UNINDEXED, z, columnsize=0, content='');
  INSERT INTO t4(rowid, x, y, z) VALUES(1, 'a a', 'b b b', 'c');
  INSERT INTO t4(rowid, x, y, z) VALUES(2, 'x a x', 'b b b y', '');
}
do_execsql_test 3.2.1 {
  SELECT rowid, fts5_test_columnsize(t4) FROM t4 WHERE t4 MATCH 'a'
} {
  1 {-1 0 -1} 2 {-1 0 -1}
}


finish_test