diff --git a/tools/shell/inc/shellInt.h b/tools/shell/inc/shellInt.h
index 825866e163..358377f804 100644
--- a/tools/shell/inc/shellInt.h
+++ b/tools/shell/inc/shellInt.h
@@ -26,6 +26,10 @@
 #include "ttypes.h"
 #include "tutil.h"
 
+#ifdef WEBSOCKET
+#include "taosws.h"
+#endif
+
 #define SHELL_MAX_HISTORY_SIZE                 1000
 #define SHELL_MAX_COMMAND_SIZE                 1048586
 #define SHELL_HISTORY_FILE                     ".taos_history"
@@ -67,6 +71,12 @@ typedef struct {
   int32_t     pktNum;
   int32_t     displayWidth;
   int32_t     abort;
+#ifdef WEBSOCKET
+  bool        restful;
+  bool        cloud;
+  char*       dsn;
+  int32_t     timeout;
+#endif
 } SShellArgs;
 
 typedef struct {
@@ -85,6 +95,10 @@ typedef struct {
   TAOS*           conn;
   TdThread        pid;
   tsem_t          cancelSem;
+#ifdef WEBSOCKET
+  WS_TAOS*        ws_conn;
+  bool		      stop_query;
+#endif
 } SShellObj;
 
 // shellArguments.c
@@ -95,7 +109,10 @@ int32_t shellReadCommand(char* command);
 
 // shellEngine.c
 int32_t shellExecute();
-
+int32_t shellCalcColWidth(TAOS_FIELD *field, int32_t precision);
+void    shellPrintHeader(TAOS_FIELD *fields, int32_t *width, int32_t num_fields);
+void    shellPrintField(const char *val, TAOS_FIELD *field, int32_t width, int32_t length, int32_t precision);
+void shellDumpFieldToFile(TdFilePtr pFile, const char *val, TAOS_FIELD *field, int32_t length, int32_t precision); 
 // shellUtil.c
 int32_t shellCheckIntSize();
 void    shellPrintVersion();
@@ -109,6 +126,14 @@ void    shellExit();
 // shellNettest.c
 void shellTestNetWork();
 
+#ifdef WEBSOCKET
+void	shellCheckConnectMode();
+// shellWebsocket.c
+int shell_conn_ws_server(bool first);
+int32_t shell_run_websocket();
+void shellRunSingleCommandWebsocketImp(char *command); 
+#endif
+
 // shellMain.c
 extern SShellObj shell;
 
diff --git a/tools/shell/src/shellArguments.c b/tools/shell/src/shellArguments.c
index 466aa52390..88ef46c5d6 100644
--- a/tools/shell/src/shellArguments.c
+++ b/tools/shell/src/shellArguments.c
@@ -43,6 +43,12 @@
 #define SHELL_VERSION  "Print program version."
 #define SHELL_EMAIL    "<support@taosdata.com>"
 
+#ifdef WEBSOCKET
+#define SHELL_DSN      "The dsn to use when connecting to cloud server."
+#define SHELL_REST     "Use restful mode when connecting."
+#define SHELL_TIMEOUT  "Set the timeout for websocket query in seconds, default is 10."
+#endif
+
 static int32_t shellParseSingleOpt(int32_t key, char *arg);
 
 void shellPrintHelp() {
@@ -65,6 +71,11 @@ void shellPrintHelp() {
   printf("%s%s%s%s\r\n", indent, "-s,", indent, SHELL_CMD);
   printf("%s%s%s%s\r\n", indent, "-t,", indent, SHELL_STARTUP);
   printf("%s%s%s%s\r\n", indent, "-u,", indent, SHELL_USER);
+#ifdef WEBSOCKET
+  printf("%s%s%s%s\r\n", indent, "-E,", indent, SHELL_DSN);
+  printf("%s%s%s%s\r\n", indent, "-R,", indent, SHELL_REST);
+  printf("%s%s%s%s\r\n", indent, "-T,", indent, SHELL_TIMEOUT);
+#endif
   printf("%s%s%s%s\r\n", indent, "-w,", indent, SHELL_WIDTH);
   printf("%s%s%s%s\r\n", indent, "-V,", indent, SHELL_VERSION);
   printf("\r\n\r\nReport bugs to %s.\r\n", SHELL_EMAIL);
@@ -95,6 +106,11 @@ static struct argp_option shellOptions[] = {
     {"display-width", 'w', "WIDTH", 0, SHELL_WIDTH},
     {"netrole", 'n', "NETROLE", 0, SHELL_NET_ROLE},
     {"pktlen", 'l', "PKTLEN", 0, SHELL_PKG_LEN},
+#ifdef WEBSOCKET
+    {"dsn", 'E', "DSN", 0, SHELL_DSN},
+    {"restful", 'R', 0, 0, SHELL_REST},
+	{"timeout", 'T', "SECONDS", 0, SHELL_TIMEOUT},
+#endif
     {"pktnum", 'N', "PKTNUM", 0, SHELL_PKT_NUM},
     {0},
 };
@@ -120,9 +136,15 @@ static int32_t shellParseSingleOpt(int32_t key, char *arg) {
   switch (key) {
     case 'h':
       pArgs->host = arg;
+#ifdef WEBSOCKET
+      pArgs->cloud = false;
+#endif
       break;
     case 'P':
       pArgs->port = atoi(arg);
+#ifdef WEBSOCKET
+      pArgs->cloud = false;
+#endif
       if (pArgs->port == 0) pArgs->port = -1;
       break;
     case 'u':
@@ -137,6 +159,9 @@ static int32_t shellParseSingleOpt(int32_t key, char *arg) {
       pArgs->is_gen_auth = true;
       break;
     case 'c':
+#ifdef WEBSOCKET
+      pArgs->cloud = false;
+#endif
       pArgs->cfgdir = arg;
       break;
     case 'C':
@@ -172,6 +197,18 @@ static int32_t shellParseSingleOpt(int32_t key, char *arg) {
     case 'N':
       pArgs->pktNum = atoi(arg);
       break;
+#ifdef WEBSOCKET
+    case 'R':
+      pArgs->restful = true;
+      break;
+    case 'E':
+      pArgs->dsn = arg;
+      pArgs->cloud = true;
+      break;
+	case 'T':
+	  pArgs->timeout = atoi(arg);
+	  break;
+#endif
     case 'V':
       pArgs->is_version = true;
       break;
@@ -208,7 +245,11 @@ int32_t shellParseArgsWithoutArgp(int argc, char *argv[]) {
     }
 
     if (key[1] == 'h' || key[1] == 'P' || key[1] == 'u' || key[1] == 'a' || key[1] == 'c' || key[1] == 's' ||
-        key[1] == 'f' || key[1] == 'd' || key[1] == 'w' || key[1] == 'n' || key[1] == 'l' || key[1] == 'N') {
+        key[1] == 'f' || key[1] == 'd' || key[1] == 'w' || key[1] == 'n' || key[1] == 'l' || key[1] == 'N' 
+#ifdef WEBSOCKET
+	   || key[1] == 'E' || key[1] == 'T'
+#endif
+		) {
       if (i + 1 >= argc) {
         fprintf(stderr, "option %s requires an argument\r\n", key);
         return -1;
@@ -221,7 +262,11 @@ int32_t shellParseArgsWithoutArgp(int argc, char *argv[]) {
       shellParseSingleOpt(key[1], val);
       i++;
     } else if (key[1] == 'p' || key[1] == 'A' || key[1] == 'C' || key[1] == 'r' || key[1] == 'k' || 
-               key[1] == 't' || key[1] == 'V' || key[1] == '?' || key[1] == 1) {
+               key[1] == 't' || key[1] == 'V' || key[1] == '?' || key[1] == 1
+#ifdef WEBSOCKET
+			   ||key[1] == 'R'
+#endif
+			   ) {
       shellParseSingleOpt(key[1], NULL);
     } else {
       fprintf(stderr, "invalid option %s\r\n", key);
diff --git a/tools/shell/src/shellEngine.c b/tools/shell/src/shellEngine.c
index 56bc1ed6cc..a2310ea9c9 100644
--- a/tools/shell/src/shellEngine.c
+++ b/tools/shell/src/shellEngine.c
@@ -25,14 +25,9 @@ static int32_t shellRunSingleCommand(char *command);
 static int32_t shellRunCommand(char *command);
 static void    shellRunSingleCommandImp(char *command);
 static char   *shellFormatTimestamp(char *buf, int64_t val, int32_t precision);
-static void    shellDumpFieldToFile(TdFilePtr pFile, const char *val, TAOS_FIELD *field, int32_t length,
-                                    int32_t precision);
 static int32_t shellDumpResultToFile(const char *fname, TAOS_RES *tres);
 static void    shellPrintNChar(const char *str, int32_t length, int32_t width);
-static void    shellPrintField(const char *val, TAOS_FIELD *field, int32_t width, int32_t length, int32_t precision);
 static int32_t shellVerticalPrintResult(TAOS_RES *tres, const char *sql);
-static int32_t shellCalcColWidth(TAOS_FIELD *field, int32_t precision);
-static void    shellPrintHeader(TAOS_FIELD *fields, int32_t *width, int32_t num_fields);
 static int32_t shellHorizontalPrintResult(TAOS_RES *tres, const char *sql);
 static int32_t shellDumpResult(TAOS_RES *tres, char *fname, int32_t *error_no, bool vertical, const char *sql);
 static void    shellReadHistory();
@@ -94,8 +89,15 @@ int32_t shellRunSingleCommand(char *command) {
     shellSourceFile(c_ptr);
     return 0;
   }
-
-  shellRunSingleCommandImp(command);
+#ifdef WEBSOCKET
+  if (shell.args.restful || shell.args.cloud) {
+	shellRunSingleCommandWebsocketImp(command);
+  } else {
+#endif
+	shellRunSingleCommandImp(command);
+#ifdef WEBSOCKET
+  }
+#endif
   return 0;
 }
 
@@ -937,7 +939,16 @@ void *shellCancelHandler(void *arg) {
       taosMsleep(10);
       continue;
     }
-    taos_kill_query(shell.conn);
+
+#ifdef WEBSOCKET
+	if (shell.args.restful || shell.args.cloud) {
+		shell.stop_query = true;
+	} else {
+#endif
+		taos_kill_query(shell.conn);
+#ifdef WEBSOCKET
+	}
+#endif 
   #ifdef WINDOWS
     printf("\n%s", shell.info.promptHeader);
   #endif
@@ -981,16 +992,26 @@ int32_t shellExecute() {
   fflush(stdout);
 
   SShellArgs *pArgs = &shell.args;
-  if (shell.args.auth == NULL) {
-    shell.conn = taos_connect(pArgs->host, pArgs->user, pArgs->password, pArgs->database, pArgs->port);
+#ifdef WEBSOCKET
+  if (shell.args.restful || shell.args.cloud) {
+	if (shell_conn_ws_server(1)) {
+		return -1;
+	}	
   } else {
-    shell.conn = taos_connect_auth(pArgs->host, pArgs->user, pArgs->auth, pArgs->database, pArgs->port);
-  }
+#endif
+	if (shell.args.auth == NULL) {
+		shell.conn = taos_connect(pArgs->host, pArgs->user, pArgs->password, pArgs->database, pArgs->port);
+	} else {
+		shell.conn = taos_connect_auth(pArgs->host, pArgs->user, pArgs->auth, pArgs->database, pArgs->port);
+	}
 
-  if (shell.conn == NULL) {
-    fflush(stdout);
-    return -1;
+	if (shell.conn == NULL) {
+		fflush(stdout);
+		return -1;
+	}
+#ifdef WEBSOCKET
   }
+#endif
 
   shellReadHistory();
 
@@ -1005,8 +1026,16 @@ int32_t shellExecute() {
     if (pArgs->file[0] != 0) {
       shellSourceFile(pArgs->file);
     }
+#ifdef WEBSOCKET
+	if (shell.args.restful || shell.args.cloud) {
+		ws_close(shell.ws_conn);
+	} else {
+#endif	
+		taos_close(shell.conn);
+#ifdef WEBSOCKET
+	}
+#endif
 
-    taos_close(shell.conn);
     shellWriteHistory();
     shellCleanupHistory();
     return 0;
@@ -1026,10 +1055,15 @@ int32_t shellExecute() {
 
   taosSetSignal(SIGINT, shellQueryInterruptHandler);
 
-  shellGetGrantInfo();
-
+#ifdef WEBSOCKET
+  if (!shell.args.restful && !shell.args.cloud) {
+#endif
+	shellGetGrantInfo();
+#ifdef WEBSOCKET
+  }
+#endif
   while (1) {
-    taosThreadCreate(&shell.pid, NULL, shellThreadLoop, shell.conn);
+    taosThreadCreate(&shell.pid, NULL, shellThreadLoop, NULL);
     taosThreadJoin(shell.pid, NULL);
     taosThreadClear(&shell.pid);
   }
diff --git a/tools/shell/src/shellMain.c b/tools/shell/src/shellMain.c
index 6672cee367..703533f8a9 100644
--- a/tools/shell/src/shellMain.c
+++ b/tools/shell/src/shellMain.c
@@ -19,6 +19,11 @@
 SShellObj shell = {0};
 
 int main(int argc, char *argv[]) {
+#ifdef WEBSOCKET
+  shell.args.timeout = 10;
+  shell.args.cloud = true;
+#endif
+
   if (shellCheckIntSize() != 0) {
     return -1;
   }
@@ -41,7 +46,9 @@ int main(int argc, char *argv[]) {
     shellPrintHelp();
     return 0;
   }
-
+#ifdef WEBSOCKET 
+  shellCheckConnectMode();
+#endif
   taos_init();
 
   if (shell.args.is_dump_config) {
diff --git a/tools/shell/src/shellUtil.c b/tools/shell/src/shellUtil.c
index e96e3d3619..e5e61e0b24 100644
--- a/tools/shell/src/shellUtil.c
+++ b/tools/shell/src/shellUtil.c
@@ -121,6 +121,36 @@ void shellCheckServerStatus() {
     }
   } while (1);
 }
+#ifdef WEBSOCKET
+void shellCheckConnectMode() {
+	if (shell.args.dsn) {
+		shell.args.cloud = true;
+		shell.args.restful = false;
+		return;
+	}
+	if (shell.args.cloud) {
+		shell.args.dsn = getenv("TDENGINE_CLOUD_DSN");
+		if (shell.args.dsn) {
+			shell.args.cloud = true;
+			shell.args.restful = false;
+			return;
+		}
+		if (shell.args.restful) {
+			if (!shell.args.host) {
+				shell.args.host = "localhost";
+			}
+			if (!shell.args.port) {
+				shell.args.port = 6041;
+			}
+			shell.args.dsn = taosMemoryCalloc(1, 1024);
+			snprintf(shell.args.dsn, 1024, "ws://%s:%d/rest/ws",
+					shell.args.host, shell.args.port);
+		}
+		shell.args.cloud = false;
+		return;
+	}
+}
+#endif
 
 void shellExit() {
   if (shell.conn != NULL) {
@@ -129,4 +159,4 @@ void shellExit() {
   }
   taos_cleanup();
   exit(EXIT_FAILURE);
-}
\ No newline at end of file
+}
diff --git a/tools/shell/src/shellWebsocket.c b/tools/shell/src/shellWebsocket.c
new file mode 100644
index 0000000000..fee2325c34
--- /dev/null
+++ b/tools/shell/src/shellWebsocket.c
@@ -0,0 +1,260 @@
+
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifdef WEBSOCKET
+#include "taosws.h"
+#include "shellInt.h"
+
+int shell_conn_ws_server(bool first) {
+	shell.ws_conn = ws_connect_with_dsn(shell.args.dsn);
+	if (!shell.ws_conn) {
+		fprintf(stderr, "failed to connect %s, reason: %s\n",
+				shell.args.dsn, ws_errstr(NULL));
+		return -1;
+	}
+	if (first && shell.args.restful) {
+		fprintf(stdout, "successfully connect to %s\n\n",
+				shell.args.dsn);
+	} else if (first && shell.args.cloud) {
+		fprintf(stdout, "successfully connect to cloud service\n");
+	}
+	return 0;
+}
+
+static int horizontalPrintWebsocket(WS_RES* wres) {
+  const void* data = NULL;
+  int rows;
+  ws_fetch_block(wres, &data, &rows);
+  if (!rows) {
+	return 0;
+  }
+  int num_fields = ws_field_count(wres);
+  TAOS_FIELD* fields = (TAOS_FIELD*)ws_fetch_fields(wres);
+  int precision = ws_result_precision(wres);
+
+  int width[TSDB_MAX_COLUMNS];
+  for (int col = 0; col < num_fields; col++) {
+    width[col] = shellCalcColWidth(fields + col, precision);
+  }
+
+  shellPrintHeader(fields, width, num_fields);
+
+  int numOfRows = 0;
+  do {
+    uint8_t ty;
+    uint32_t len;
+    for (int i = 0; i < rows; i++) {
+      for (int j = 0; j < num_fields; j++) {
+        putchar(' ');
+        const void *value = ws_get_value_in_block(wres, i, j, &ty, &len);
+        shellPrintField((const char*)value, fields+j, width[j], len, precision);
+        putchar(' ');
+        putchar('|');
+      }
+	  putchar('\r');
+      putchar('\n');
+    }
+    numOfRows += rows;
+    ws_fetch_block(wres, &data, &rows);
+  } while (rows && !shell.stop_query);
+  return numOfRows;
+}
+
+static int verticalPrintWebsocket(WS_RES* wres) {
+  int rows = 0;
+  const void* data = NULL;
+  ws_fetch_block(wres, &data, &rows);
+  if (!rows) {
+	return 0;
+  }
+  int num_fields = ws_field_count(wres);
+  TAOS_FIELD* fields = (TAOS_FIELD*)ws_fetch_fields(wres);
+  int precision = ws_result_precision(wres);
+
+  int maxColNameLen = 0;
+  for (int col = 0; col < num_fields; col++) {
+    int len = (int)strlen(fields[col].name);
+    if (len > maxColNameLen) {
+      maxColNameLen = len;
+    }
+  }
+  int numOfRows = 0;
+  do {
+    uint8_t ty;
+    uint32_t len;
+    for (int i = 0; i < rows; i++) {
+      printf("*************************** %d.row ***************************\n",
+			  numOfRows + 1);
+      for (int j = 0; j < num_fields; j++) {
+        TAOS_FIELD* field = fields + j;
+        int padding = (int)(maxColNameLen - strlen(field->name));
+        printf("%*.s%s: ", padding, " ", field->name);
+        const void *value = ws_get_value_in_block(wres, i, j, &ty, &len);
+        shellPrintField((const char*)value, field, 0, len, precision);
+        putchar('\n');
+      }
+      numOfRows++;
+    }
+    ws_fetch_block(wres, &data, &rows);
+  } while (rows && !shell.stop_query);
+  return numOfRows;
+}
+
+static int dumpWebsocketToFile(const char* fname, WS_RES* wres) {
+  char fullname[PATH_MAX] = {0};
+  if (taosExpandDir(fname, fullname, PATH_MAX) != 0) {
+    tstrncpy(fullname, fname, PATH_MAX);
+  }
+
+  TdFilePtr pFile = taosOpenFile(fullname,
+		  TD_FILE_CREATE | TD_FILE_WRITE | TD_FILE_TRUNC | TD_FILE_STREAM);
+  if (pFile == NULL) {
+    fprintf(stderr, "failed to open file: %s\r\n", fullname);
+    return -1;
+  }
+  int rows = 0;
+  const void* data = NULL;
+  ws_fetch_block(wres, &data, &rows);
+  if (!rows) {
+    taosCloseFile(&pFile);
+	return 0;
+  }
+  int numOfRows = 0;
+  TAOS_FIELD* fields = (TAOS_FIELD*)ws_fetch_fields(wres);
+  int num_fields = ws_field_count(wres);
+  int precision = ws_result_precision(wres);
+  for (int col = 0; col < num_fields; col++) {
+    if (col > 0) {
+      taosFprintfFile(pFile, ",");
+    }
+    taosFprintfFile(pFile, "%s", fields[col].name);
+  }
+  taosFprintfFile(pFile, "\r\n"); 
+  do {
+    uint8_t ty;
+    uint32_t len;
+    numOfRows += rows;
+    for (int i = 0; i < rows; i++) {
+      for (int j = 0; j < num_fields; j++) {
+        if (j > 0) {
+          taosFprintfFile(pFile, ",");
+        }
+        const void *value = ws_get_value_in_block(wres, i, j, &ty, &len);
+        shellDumpFieldToFile(pFile, (const char*)value, fields + j, len, precision);
+      }
+      taosFprintfFile(pFile, "\r\n");
+    }
+    ws_fetch_block(wres, &data, &rows);
+  } while (rows && !shell.stop_query);
+  taosCloseFile(&pFile);
+  return numOfRows;
+}
+
+static int shellDumpWebsocket(WS_RES *wres, char *fname, int *error_no, bool vertical) {
+  int numOfRows = 0;
+  if (fname != NULL) {
+    numOfRows = dumpWebsocketToFile(fname, wres);
+  } else if (vertical) {
+    numOfRows = verticalPrintWebsocket(wres);
+  } else {
+    numOfRows = horizontalPrintWebsocket(wres);
+  }
+  *error_no = ws_errno(wres);
+  return numOfRows;
+}
+
+void shellRunSingleCommandWebsocketImp(char *command) {
+  int64_t st, et;
+  char   *sptr = NULL;
+  char   *cptr = NULL;
+  char   *fname = NULL;
+  bool    printMode = false;
+
+  if ((sptr = strstr(command, ">>")) != NULL) {
+    cptr = strstr(command, ";");
+    if (cptr != NULL) {
+      *cptr = '\0';
+    }
+
+    fname = sptr + 2;
+    while (*fname == ' ') fname++;
+    *sptr = '\0';
+  }
+
+  if ((sptr = strstr(command, "\\G")) != NULL) {
+    cptr = strstr(command, ";");
+    if (cptr != NULL) {
+      *cptr = '\0';
+    }
+
+    *sptr = '\0';
+    printMode = true;  // When output to a file, the switch does not work.
+  }
+
+  if (!shell.ws_conn && shell_conn_ws_server(0)) {
+	return;
+  }
+
+  shell.stop_query = false;
+  st = taosGetTimestampUs();
+
+  WS_RES* res = ws_query_timeout(shell.ws_conn, command, shell.args.timeout);
+  int code = ws_errno(res);
+  if (code != 0) {
+	et = taosGetTimestampUs();
+	fprintf(stderr, "\nDB: error: %s (%.6fs)\n", ws_errstr(res), (et - st)/1E6);
+	if (code == TSDB_CODE_WS_SEND_TIMEOUT || code == TSDB_CODE_WS_RECV_TIMEOUT) {
+		fprintf(stderr, "Hint: use -t to increase the timeout in seconds\n");
+	} else if (code == TSDB_CODE_WS_INTERNAL_ERRO || code == TSDB_CODE_WS_CLOSED) {
+		fprintf(stderr, "TDengine server is down, will try to reconnect\n");
+		shell.ws_conn = NULL;
+	}
+	ws_free_result(res);
+	return;
+  }
+
+  if (shellRegexMatch(command, "^\\s*use\\s+[a-zA-Z0-9_]+\\s*;\\s*$", REG_EXTENDED | REG_ICASE)) {
+    fprintf(stdout, "Database changed.\r\n\r\n");
+    fflush(stdout);
+	ws_free_result(res);
+    return;
+  }
+
+  int numOfRows = 0;
+  if (ws_is_update_query(res)) {
+	numOfRows = ws_affected_rows(res);
+	et = taosGetTimestampUs();
+	printf("Query Ok, %d of %d row(s) in database (%.6fs)\n", numOfRows, numOfRows,
+			(et - st)/1E6);
+  } else {
+	int error_no = 0;
+	numOfRows  = shellDumpWebsocket(res, fname, &error_no, printMode);
+	if (numOfRows < 0) {
+		ws_free_result(res);
+		return;
+	}
+	et = taosGetTimestampUs();
+	if (error_no == 0 && !shell.stop_query) {
+		printf("Query OK, %d row(s) in set (%.6fs)\n", numOfRows,
+				(et - st)/1E6);
+	} else {
+		printf("Query interrupted, %d row(s) in set (%.6fs)\n", numOfRows,
+				(et - st)/1E6);
+	}
+  }
+  printf("\n");
+  ws_free_result(res);
+}
+#endif