这个LightDB扩展实现了JRES的T3请求
要安装t3sdk， 需要使用CRES的C客户端库，默认版本是CRES2.0.V202302.00.000。这个库可以是从恒生下载
下载CRES的SDK并解压，目录如下:
acm/
dev/
client_demo/T3SDK/c++/linux.x64/lib/libt3sdk.so
client_demo/T3SDK_C/linux.x64/lib/libt3sdk_c.so
docker/
instance/
tools/
CRES SDK的libt3sdk.so and libt3sdk_c.so 必须添加到 LD_LIBRARY_PATH.
如果你首次安装, 使用 CREATE EXTENSION t3sdk.
如果你已经安装了一个之前的版本，并且仅仅想要升级则使用 ALTER EXTENSION t3sdk UPDATE.
每一个T3调用都是由VARCHAR请求列表和t3sdk_response应答组成.
每次向T3的服务请求时，后端进程都会保持连接，直到该进程退出。键是服务器地址和端口，值是连接句柄。
List of functions
Schema | Name | Result data type | Argument data types | Type
--------+------------+------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------
public | t3sdk_send | t3sdk_response | t_address character varying, groups character varying, service character varying, version character varying, function_id character varying, function_args character varying | func
Composite type "public.t3sdk_response"
Column | Type | Collation | Nullable | Default
---------+-------------------+-----------+----------+---------
content | character varying | | |
t3sdk_send(t_address VARCHAR, groups VARCHAR, service VARCHAR, version VARCHAR, function_id VARCHAR, function_args VARCHAR) returns t3sdk_response
默认情况下，发送请求的超时时间为60秒。如果需要不同的超时时间，可以使用毫秒设置以下GUC变量:
t3sdk.t3_send_timeout_msec = 60000
默认情况下，为请求的接收设置了60秒的超时时间。如果需要不同的超时时间，可以使用毫秒设置以下GUC变量:
t3sdk.t3_recv_timeout_msec = 60000
如果需要不同T3的许可证，可以使用以下GUC变量进行设置:
t3sdk.t3_license_no = 'HS-HUNDSUN001-FBASE2-0000-4ePWxzscBVtY9ZKdgDKhSyk2'
-- 发送t3请求
select * from t3sdk_send('10.20.30.193:18082', 'g', 'repo-app', 'v', 'getExpressInfoNdb', '');
content
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
----------------------------------------
{"result":[{"express_id":"a","order_id":"1","express_no":"123456789","company":"测试公司1","create_datetime":"20230407010201","status":"0"},{"express_id":"b","order_id":"2","express_no":"123456789","company":"测试公司2","create_dat
etime":"20230407010201","status":"0"}]}
(1 row)