Oracle 中調用外部C動態庫函數

Oracle 中調用外部C動態庫函數

由於項目為了縮短開發時間，要在Oracle中調用外部已經開發好的C程序。
查找了網上的一些帖子，再結合實際總結這篇文章。希望對大家有所幫助。
參考文章:http://www.cnblogs.com/mathitlin99/archive/2013/09/05/3303717.html

首先編譯外部動態庫libDialPlan.so

gcc -fPIC -c LibDialPlan.cpp
gcc -shared -o libDialPlan.so LibDialPlan.o -lstdc++

修改Oracle TNS文件和監聽文件。
不清楚大家直接拷貝是否可用。如果有問題，請注意一下等號以及括號兩邊的空格。
tnsnames.ora

ORADB =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.69.166)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = oradb)
) 
)

EXTPROC_CONNECTION_DATA=
(DESCRIPTION=
(ADDRESS_LIST=
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
(CONNECT_DATA=
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)

listener.ora

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.69.166)(PORT = 1521))
)
)

ADR_BASE_LISTENER = /home/oracle/db/app


SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = oradb)
(SID_NAME = oradb)
)
(SID_DESC=
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /opt/local/oracle/app/product/11.2.0/dbhome_2)
(ENVS = EXTPROC_DLLS=ANY)
(PROGRAM = extproc)
) 
)

修改後重啟監聽:lsnrctl stop ;lsnrctl start
查看監聽狀態，應該出現如下的監聽項:PLSExtProc

[root@localhost admin]# lsnrctl status

LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 04-AUG-2016 19:33:50

Copyright (c) 1991, 2009, Oracle. All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date                04-AUG-2016 16:23:54
Uptime                    0 days 3 hr. 9 min. 55 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File /opt/local/oracle/app/product/11.2.0/dbhome_2/network/admin/listener.ora
Listener Log File /opt/local/oracle/app/product/11.2.0/dbhome_2/network/log/listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.69.166)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "oradb" has 1 instance(s).
Instance "oradb", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
[root@localhost admin]#

創建Oraclelibrary 對象

create or replace library hytpdtbilldb.Fun_Ext_Proc
as '/opt/local/Oracle_install/Oracle_Call_External_C/libDialPlan.so';

創建函數
1)按照網上的文章，還有一個parameter的參數。
但是我加入這個參數後一直不能編譯通過。去掉後並未影響函數的使用。
2)數字和字符串對應的是binary_integer,varchar2類型。本來C的入參是需要數組類型，但是Oracle沒有真正的數組，只能通過字符串代替。
3)在我測試的過程中，偶爾需要重啟才能正常調用函數。大家使用的過程中可以留意一下。

create or replace function hytpdtbilldb.Air2Gsi
(x binary_integer,y varchar2)
return varchar2
as
language C
library hytpdtbilldb.Fun_Ext_Proc 
name "Air2Gsi";
/