@@ -362,7 +362,7 @@ By using the optional req_id parameter, you can specify a request ID that can be
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@@ -362,7 +362,7 @@ By using the optional req_id parameter, you can specify a request ID that can be
##### TaosConnection class
##### TaosConnection class
The `TaosConnection` class contains both an implementation of the PEP249 Connection interface (e.g., the `cursor()` method and the `close()` method) and many extensions (e.g., the `execute()`, `query()`, `schemaless_insert()`, and `subscribe()` methods).
As the way to connect introduced above but add `req_id` argument.
The queried results can only be fetched once. For example, only one of `fetch_all()` and `fetch_all_into_dict()` can be used in the example above. Repeated fetches will result in an empty list.
:::
##### Use of TaosResult class
##### Use of TaosResult class
In the above example of using the `TaosConnection` class, we have shown two ways to get the result of a query: `fetch_all()` and `fetch_all_into_dict()`. In addition, `TaosResult` also provides methods to iterate through the result set by rows (`rows_iter`) or by data blocks (`blocks_iter`). Using these two methods will be more efficient in scenarios where the query has a large amount of data.
As the way to fetch data introduced above but add `req_id` argument.
The TaosCursor class uses native connections for write and query operations. In a client-side multi-threaded scenario, this cursor instance must remain thread exclusive and cannot be shared across threads for use, otherwise, it will result in errors in the returned results.
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</TabItem>
</TabItem>
<TabItem value="rest" label="REST connection">
<TabItem value="rest" label="REST connection">
##### Use of TaosRestCursor class
##### Use of TaosRestCursor class
The `TaosRestCursor` class is an implementation of the PEP249 Cursor interface.
As the way to connect introduced above but add `req_id` argument.
system sh/cfg.sh -n dnode1 -c filterScalarMode -v 1
system sh/exec.sh -n dnode1 -s start
sql connect
sql drop database if exists db1;
sql create database if not exists db1;
sql use db1;
sql create stable sta (ts timestamp, f1 double, f2 binary(200)) tags(t1 int);
sql create table tba1 using sta tags(1);
sql insert into tba1 values ('2022-04-26 15:15:01', 1.0, "a");
sql insert into tba1 values ('2022-04-26 15:15:02', 2.0, "b");
sql insert into tba1 values ('2022-04-26 15:15:04', 4.0, "b");
sql insert into tba1 values ('2022-04-26 15:15:05', 5.0, "b");
sql select last_row(*) from sta where ts >= 1678901803783 and ts <= 1678901803783 and _c0 <= 1678901803782 interval(10d,8d) fill(linear) order by _wstart desc;
