Oracle 11g client的配置
首先从OTN下载几个压缩包
下载地址为: http://www.oracle.com/technology/software/tech/oci/instantclient/index.html
然后根据你的平台，选择不同的下载，我是安装在rhel5下，所以选择了linux x86 并下载了下面2个包：
instantclient-basic-linux32-11.1.0.7.zip 基本包，提供了OCI,OCCI和JDBC-OCI应用程序的支持。
instantclient-sdk-linux32-11.1.0.7.zip 附加的头文件和makefile文件，部分需要编译的模板需要，比如编译php的oci8,和python 的cx_Oracle. (我们这里仅使用其提供的oci头文件)
instantclient-sqlplus-linux32-11.1.0.7.zip 可选安装，sqlplus..有时候测试，管理什么的很方便。
1.建立oracle用户和组：
#groupadd oinstall
#useradd －g oinstall oracle
#passwd oracle
2.建立一个Oracle 基本目录
#mkdir –p /usr/local/oracle
#chown –R oracle:oinstall /usr/local/oracle
#chmod –R 775 /usr/local/oracle
将上述tar.gz或zip包解压，拷贝到 /usr/local/oracle目录中。
3.设置 ORACLE_HOME和LD_LIBRARY_PATH环境变量，配置TNS_ADMIN变量（放置 tnsname.ora的目录).如果使用sqlplus的话，也设置下PATH环境变量。修改oracle用户目录下的 .bash_profile加入下面语句.
export ORACLE_HOME=/usr/local/oracle
#export ORACLE_SID=hbdb
export SQLPATH=/usr/local/oracle
#寻找tnsnames.ora路径
export TNS_ADMIN=/usr/local/oracle
export NLS_LANG=''american_america.ZHS16GBK''
export LD_LIBRARY_PATH=$ORACLE_HOME:$LD_LIBRARY_PATH
export PATH=$PATH:$ORACLE_HOME
4.tnsnames.ora配置：
MYDB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.0.0.5)(PORT = 1521))
)
(CONNECT_DATA =
(SID = HBDB)
(SERVER = DEDICATED)
)
)
5.sqlplus连接数据库：
sqlplus user/passwd@10.0.0.5/hbdb或sqlplus user/passwd@MYDB
如果出现：sqlplus: error while loading shared libraries: /usr/local/oracle/libnnz11.so: cannot restore segment prot after reloc: Permission denied
最简单的解决方法莫过于将SElinux设置位PERMISSIVE状态：
[root@localhost ~]# getenforce
Enforcing
[root@localhost ~]# setenforce 0
[root@localhost ~]# getenforce
Permissive
[oracle@localhost ~]# sqlplus xfdb/xfdb@MYDB
SQL*Plus: Release 11.1.0.7.0 - Production on Wed Jun 17 16:37:06 2009
Copyright (c) 1982, 2008, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select sysdate from dual;
SYSDATE
------------
17-JUN-09
SQL>
6.测试eams项目数据库访问组件dboci(对oci的c++封装)
先建立一个libclntsh.so.11.1的链接：
[oracle@localhost oracle]# ln -s libclntsh.so.11.1 libclntsh.so
#include "dboci.h"
#include <iostream>
int main(void)
{
CDbOci oci;
int iret = oci.Open("xfdb", "xfdb", "HBDB");
if (iret < 1)
return 0; //
char*** result = NULL;
int num = oci.Query("select sysdate from dual", &result, 1);
if (num > 0)
{
for (int i=0; i < num; i++)
{
std::cout <<result[i][0] <<std::endl;
}
oci.FreeExecSqlBuf(&result, num, 1);
}
oci.Close();
return 1;
}
scons脚本：
env = Environment()
env.Append(CCFLAGS='-g')
src_files = Split('DBconnect.cpp ../dboci/source/dboci.cpp')
include = Split('/usr/local/oracle/sdk/include ../dboci/include')
lib_path = Split('/usr/local/oracle')
lib_files = Split('clntsh nnz11')
env.Program(target='dbconnect',source = src_files, LIBS=lib_files, LIBPATH=lib_path,CPPPATH=include)
运行结果：
[root@localhost dbconnecttest]# ./dbconnect
17-JUN-09
至此eams项目数据库存取的开发与部署测试通过!
顺带说明下oracle 11g即时客户端在windows下的配置
1. 假设把压缩文件解压到d盘根目录;
2. 编辑环境，将d:\instantclient_11_1添加到PATH中（注意位于其他Oracle目录之前）,增加系统环境变量TNS_ADMIN设置为d:\instantclient_11_1;ORACLE_HOME设置为d:\instantclient_11_1;NLS_LANG为''american_america.ZHS16GBK''
例如，在Windows 2000上，依次单击“开始”->“设置”->“控制面板”->“系统”->“高级”->“环境变量”，编辑系统变量列表中的PATH,系统环境变量TNS_ADMIN设置为d:\instantclient_11_1;系统环境变量ORACLE_HOME设置为d:\instantclient_11_1;系统环境变量NLS_LANG设置为american_america.ZHS16GBK
3. 编辑d:\instantclient_11_1\ tnsnames.ora文件:
MYDB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.0.0.5)(PORT = 1521))
)
(CONNECT_DATA =
(SID = HBDB)
(SERVER = DEDICATED)
)
)
其中:MYDB:数据库的事例名
10.0.0.5数据库服务器地址
HBDB:数据库的SID;
来源：https://www.cnblogs.com/snake-hand/archive/2011/07/25/2452274.html