tclsqlite.c

sqlite 嵌入式数据库的源码

      }
      for(i=1; i<=nVar; i++){
        const char *zVar = sqlite3_bind_parameter_name(pStmt, i);
        if( zVar!=0 && (zVar[0]=='$' || zVar[0]==':') ){
          Tcl_Obj *pVar = Tcl_GetVar2Ex(interp, &zVar[1], 0, 0);
          if( pVar ){
            int n;
            u8 *data;
            char *zType = pVar->typePtr ? pVar->typePtr->name : "";
            char c = zType[0];
            if( c=='b' && strcmp(zType,"bytearray")==0 ){
              data = Tcl_GetByteArrayFromObj(pVar, &n);
              sqlite3_bind_blob(pStmt, i, data, n, SQLITE_STATIC);
              Tcl_IncrRefCount(pVar);
              apParm[nParm++] = pVar;
            }else if( (c=='b' && strcmp(zType,"boolean")==0) ||
                  (c=='i' && strcmp(zType,"int")==0) ){
              Tcl_GetIntFromObj(interp, pVar, &n);
              sqlite3_bind_int(pStmt, i, n);
            }else if( c=='d' && strcmp(zType,"double")==0 ){
              double r;
              Tcl_GetDoubleFromObj(interp, pVar, &r);
              sqlite3_bind_double(pStmt, i, r);
            }else{
              data = Tcl_GetStringFromObj(pVar, &n);
              sqlite3_bind_text(pStmt, i, data, n, SQLITE_STATIC);
              Tcl_IncrRefCount(pVar);
              apParm[nParm++] = pVar;
            }
          }else{
            sqlite3_bind_null( pStmt, i );
          }
        }
      }

      /* Compute column names */
      nCol = sqlite3_column_count(pStmt);
      if( pScript ){
        apColName = (Tcl_Obj**)Tcl_Alloc( sizeof(Tcl_Obj*)*nCol );
        if( apColName==0 ) break;
        for(i=0; i<nCol; i++){
          apColName[i] = dbTextToObj(sqlite3_column_name(pStmt,i));
          Tcl_IncrRefCount(apColName[i]);
        }
      }

      /* If results are being stored in an array variable, then create
      ** the array(*) entry for that array
      */
      if( pArray ){
        Tcl_Obj *pColList = Tcl_NewObj();
        Tcl_Obj *pStar = Tcl_NewStringObj("*", -1);
        Tcl_IncrRefCount(pColList);
        for(i=0; i<nCol; i++){
          Tcl_ListObjAppendElement(interp, pColList, apColName[i]);
        }
        Tcl_ObjSetVar2(interp, pArray, pStar, pColList,0);
        Tcl_DecrRefCount(pColList);
        Tcl_DecrRefCount(pStar);
      }

      /* Execute the SQL
      */
      while( rc==TCL_OK && pStmt && SQLITE_ROW==sqlite3_step(pStmt) ){
        for(i=0; i<nCol; i++){
          Tcl_Obj *pVal;
          
          /* Set pVal to contain the i'th column of this row. */
          switch( sqlite3_column_type(pStmt, i) ){
            case SQLITE_BLOB: {
              int bytes = sqlite3_column_bytes(pStmt, i);
              pVal = Tcl_NewByteArrayObj(sqlite3_column_blob(pStmt, i), bytes);
              break;
            }
            case SQLITE_INTEGER: {
              sqlite_int64 v = sqlite3_column_int64(pStmt, i);
              if( v>=-2147483647 && v<=2147483647 ){
                pVal = Tcl_NewIntObj(v);
              }else{
                pVal = Tcl_NewWideIntObj(v);
              }
              break;
            }
            case SQLITE_FLOAT: {
              double r = sqlite3_column_double(pStmt, i);
              pVal = Tcl_NewDoubleObj(r);
              break;
            }
            case SQLITE_NULL: {
              pVal = dbTextToObj(pDb->zNull);
              break;
            }
            default: {
              pVal = dbTextToObj(sqlite3_column_text(pStmt, i));
              break;
            }
          }
  
          if( pScript ){
            if( pArray==0 ){
              Tcl_ObjSetVar2(interp, apColName[i], 0, pVal, 0);
            }else{
              Tcl_ObjSetVar2(interp, pArray, apColName[i], pVal, 0);
            }
          }else if( choice==DB_ONECOLUMN ){
            if( pRet==0 ){
              pRet = pVal;
              Tcl_IncrRefCount(pRet);
            }
            rc = TCL_BREAK;
          }else{
            Tcl_ListObjAppendElement(interp, pRet, pVal);
          }
        }
  
        if( pScript ){
          rc = Tcl_EvalObjEx(interp, pScript, 0);
          if( rc==TCL_CONTINUE ){
            rc = TCL_OK;
          }
        }
      }
      if( rc==TCL_BREAK ){
        rc = TCL_OK;
      }

      /* Free the column name objects */
      if( pScript ){
        for(i=0; i<nCol; i++){
          Tcl_DecrRefCount(apColName[i]);
        }
        Tcl_Free((char*)apColName);
      }

      /* Free the bound string and blob parameters */
      for(i=0; i<nParm; i++){
        Tcl_DecrRefCount(apParm[i]);
      }
      if( apParm!=aParm ){
        Tcl_Free((char*)apParm);
      }

      /* Reset the statement.  If the result code is SQLITE_SCHEMA, then
      ** flush the statement cache and try the statement again.
      */
      rc2 = sqlite3_reset(pStmt);
      if( SQLITE_SCHEMA==rc2 ){
        /* After a schema change, flush the cache and try to run the
        ** statement again
        */
        flushStmtCache( pDb );
        sqlite3_finalize(pStmt);
        if( pPreStmt ) Tcl_Free((char*)pPreStmt);
        continue;
      }else if( SQLITE_OK!=rc2 ){
        /* If a run-time error occurs, report the error and stop reading
        ** the SQL
        */
        Tcl_SetObjResult(interp, dbTextToObj(sqlite3_errmsg(pDb->db)));
        sqlite3_finalize(pStmt);
        rc = TCL_ERROR;
        if( pPreStmt ) Tcl_Free((char*)pPreStmt);
        break;
      }else if( pDb->maxStmt<=0 ){
        /* If the cache is turned off, deallocated the statement */
        if( pPreStmt ) Tcl_Free((char*)pPreStmt);
        sqlite3_finalize(pStmt);
      }else{
        /* Everything worked and the cache is operational.
        ** Create a new SqlPreparedStmt structure if we need one.
        ** (If we already have one we can just reuse it.)
        */
        if( pPreStmt==0 ){
          len = zLeft - zSql;
          pPreStmt = (SqlPreparedStmt*)Tcl_Alloc( sizeof(*pPreStmt) + len );
          if( pPreStmt==0 ) return TCL_ERROR;
          pPreStmt->pStmt = pStmt;
          pPreStmt->nSql = len;
          memcpy(pPreStmt->zSql, zSql, len);
          pPreStmt->zSql[len] = 0;
        }

        /* Add the prepared statement to the beginning of the cache list
        */
        pPreStmt->pNext = pDb->stmtList;
        pPreStmt->pPrev = 0;
        if( pDb->stmtList ){
         pDb->stmtList->pPrev = pPreStmt;
        }
        pDb->stmtList = pPreStmt;
        if( pDb->stmtLast==0 ){
          assert( pDb->nStmt==0 );
          pDb->stmtLast = pPreStmt;
        }else{
          assert( pDb->nStmt>0 );
        }
        pDb->nStmt++;
   
        /* If we have too many statement in cache, remove the surplus from the
        ** end of the cache list.
        */
        while( pDb->nStmt>pDb->maxStmt ){
          sqlite3_finalize(pDb->stmtLast->pStmt);
          pDb->stmtLast = pDb->stmtLast->pPrev;
          Tcl_Free((char*)pDb->stmtLast->pNext);
          pDb->stmtLast->pNext = 0;
          pDb->nStmt--;
        }
      }

      /* Proceed to the next statement */
      zSql = zLeft;
    }
    Tcl_DecrRefCount(objv[2]);

    if( pRet ){
      if( rc==TCL_OK ){
        Tcl_SetObjResult(interp, pRet);
      }
      Tcl_DecrRefCount(pRet);
    }
    break;
  }

  /*
  **     $db function NAME SCRIPT
  **
  ** Create a new SQL function called NAME.  Whenever that function is
  ** called, invoke SCRIPT to evaluate the function.
  */
  case DB_FUNCTION: {
    SqlFunc *pFunc;
    char *zName;
    char *zScript;
    int nScript;
    if( objc!=4 ){
      Tcl_WrongNumArgs(interp, 2, objv, "NAME SCRIPT");
      return TCL_ERROR;
    }
    zName = Tcl_GetStringFromObj(objv[2], 0);
    zScript = Tcl_GetStringFromObj(objv[3], &nScript);
    pFunc = (SqlFunc*)Tcl_Alloc( sizeof(*pFunc) + nScript + 1 );
    if( pFunc==0 ) return TCL_ERROR;
    pFunc->interp = interp;
    pFunc->pNext = pDb->pFunc;
    pFunc->zScript = (char*)&pFunc[1];
    pDb->pFunc = pFunc;
    strcpy(pFunc->zScript, zScript);
    rc = sqlite3_create_function(pDb->db, zName, -1, SQLITE_UTF8,
        pFunc, tclSqlFunc, 0, 0);
    if( rc!=SQLITE_OK ){
      rc = TCL_ERROR;
      Tcl_SetResult(interp, (char *)sqlite3_errmsg(pDb->db), TCL_VOLATILE);
    }else{
      /* Must flush any cached statements */
      flushStmtCache( pDb );
    }
    break;
  }

  /*
  **     $db last_insert_rowid 
  **
  ** Return an integer which is the ROWID for the most recent insert.
  */
  case DB_LAST_INSERT_ROWID: {
    Tcl_Obj *pResult;
    int rowid;
    if( objc!=2 ){
      Tcl_WrongNumArgs(interp, 2, objv, "");
      return TCL_ERROR;
    }
    rowid = sqlite3_last_insert_rowid(pDb->db);
    pResult = Tcl_GetObjResult(interp);
    Tcl_SetIntObj(pResult, rowid);
    break;
  }

  /*
  ** The DB_ONECOLUMN method is implemented together with DB_EVAL.
  */

  /*    $db progress ?N CALLBACK?
  ** 
  ** Invoke the given callback every N virtual machine opcodes while executing
  ** queries.
  */
  case DB_PROGRESS: {
    if( objc==2 ){
      if( pDb->zProgress ){
        Tcl_AppendResult(interp, pDb->zProgress, 0);
      }
    }else if( objc==4 ){
      char *zProgress;
      int len;
      int N;
      if( TCL_OK!=Tcl_GetIntFromObj(interp, objv[2], &N) ){
	return TCL_ERROR;
      };
      if( pDb->zProgress ){
        Tcl_Free(pDb->zProgress);
      }
      zProgress = Tcl_GetStringFromObj(objv[3], &len);
      if( zProgress && len>0 ){
        pDb->zProgress = Tcl_Alloc( len + 1 );
        strcpy(pDb->zProgress, zProgress);
      }else{
        pDb->zProgress = 0;
      }
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
      if( pDb->zProgress ){
        pDb->interp = interp;
        sqlite3_progress_handler(pDb->db, N, DbProgressHandler, pDb);
      }else{
        sqlite3_progress_handler(pDb->db, 0, 0, 0);
      }
#endif
    }else{
      Tcl_WrongNumArgs(interp, 2, objv, "N CALLBACK");
      return TCL_ERROR;
    }
    break;
  }

  /*
  **     $db rekey KEY
  **
  ** Change the encryption key on the currently open database.
  */
  case DB_REKEY: {
    int nKey;
    void *pKey;
    if( objc!=3 ){
      Tcl_WrongNumArgs(interp, 2, objv, "KEY");
      return TCL_ERROR;
    }
    pKey = Tcl_GetByteArrayFromObj(objv[2], &nKey);
#ifdef SQLITE_HAS_CODEC
    rc = sqlite3_rekey(pDb->db, pKey, nKey);
    if( rc ){
      Tcl_AppendResult(interp, sqlite3ErrStr(rc), 0);
      rc = TCL_ERROR;
    }
#endif
    break;
  }

  /*
  **     $db timeout MILLESECONDS
  **
  ** Delay for the number of milliseconds specified when a file is locked.
  */
  case DB_TIMEOUT: {
    int ms;
    if( objc!=3 ){
      Tcl_WrongNumArgs(interp, 2, objv, "MILLISECONDS");
      return TCL_ERROR;
    }
    if( Tcl_GetIntFromObj(interp, objv[2], &ms) ) return TCL_ERROR;
    sqlite3_busy_timeout(pDb->db, ms);
    break;
  }

  /*
  **     $db nullvalue ?STRING?
  **
  ** Change text used when a NULL comes back from the database. If ?STRING?
  ** is not present, then the current string used for NULL is returned.
  ** If STRING is present, then STRING is returned.
  **
  */
  case DB_NULLVALUE: {
    if( objc!=2 && objc!=3 ){
      Tcl_WrongNumArgs(interp, 2, objv, "NULLVALUE");
      return TCL_ERROR;
    }
    if( objc==3 ){
      int len;
      char *zNull = Tcl_GetStringFromObj(objv[2], &len);
      if( pDb->zNull ){
        Tcl_Free(pDb->zNull);
      }
      if( zNull && len>0 ){
        pDb->zNull = Tcl_Alloc( len + 1 );
        strncpy(pDb->zNull, zNull, len);
        pDb->zNull[len] = '\0';
      }else{
        pDb->zNull = 0;
      }
    }
    Tcl_SetObjResult(interp, dbTextToObj(pDb->zNull));
    break;
  }
  
  /*
  **     $db total_changes
  **
  ** Return the number of rows that were modified, inserted, or deleted 
  ** since the database handle was created.
  */
  case DB_TOTAL_CHANGES: {
    Tcl_Obj *pResult;
    if( objc!=2 ){
      Tcl_WrongNumArgs(interp, 2, objv, "");
      return TCL_ERROR;
    }
    pResult = Tcl_GetObjResult(interp);
    Tcl_SetIntObj(pResult, sqlite3_total_changes(pDb->db));
    break;
  }

  /*    $db trace ?CALLBACK?
  **
  ** Make arrangements to invoke the CALLBACK routine for each SQL statement
  ** that is executed.  The text of the SQL is appended to CALLBACK before
  ** it is executed.
  */
  case DB_TRACE: {
    if( objc>3 ){
      Tcl_WrongNumArgs(interp, 2, objv, "?CALLBACK?");
      return TCL_ERROR;
    }else if( objc==2 ){
      if( pDb->zTrace ){
        Tcl_AppendResult(interp, pDb->zTrace, 0);
      }
    }else{
      char *zTrace;
      int len;
      if( pDb->zTrace ){
        Tcl_Free(pDb->zTrace);
      }
      zTrace = Tcl_GetStringFromObj(objv[2], &len);
      if( zTrace && len>0 ){
        pDb->zTrace = Tcl_Alloc( len + 1 );
        strcpy(pDb->zTrace, zTrace);
      }else{
        pDb->zTrace = 0;
      }
      if( pDb->zTrace ){
        pDb->interp = interp;
        sqlite3_trace(pDb->db, DbTraceHandler, pDb);
      }else{
        sqlite3_trace(pDb->db, 0, 0);
      }
    }
    break;
  }

  /*    $db copy conflict-algorithm table filename ?SEPARATOR? ?NULLINDICATOR?
  **
  ** Copy data into table from filename, optionally using SEPARATOR
  ** as column separators.  If a column contains a null string, or the
  ** value of NULLINDICATOR, a NULL is inserted for the column.
  ** conflict-algorithm is one of the sqlite conflict algorithms:
  **    rollback, abort, fail, ignore, replace
  ** On success, return the number of lines processed, not necessarily same
  ** as 'db changes' due to conflict-algorithm selected.
  **