最近一直在进行ORACLE 10g和PRO*C的学习，其中遇到了不少的问题，现记录下来，以供以后参考。
一、常见问题
[注：我的linux版本是rhel 5,Oracle版本是10g]
1、在ORACLE 10g 安装准备的过程中：缺少libXp.so.6依赖
上网搜过不少文章，但是都不是很好的解决
我自己摸索出一个解决方法：
在RHEL5的安装盘中找到libXp-1.0.0-8.i386.rpm，进行安装后，便可解决。
2、在ORACLE 10g 安装过程中Xlib: connection to ":0.0" refused by server
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified
Error: Can't open display: :0.0
以root用户登陆，在shell中运行
[root@brady ~]# xhost local:oracle
non-network local connections being added to access control list
然后oracle身份就可以运行X程序了。
man xhost中有这样一段
A complete name has the syntax ‘‘family:name’’ where the families are as follows:
inet Internet host (IPv4)
inet6 Internet host (IPv6)
dnet DECnet host
nis Secure RPC network name
krb Kerberos V5 principal
local contains only one name, the empty string
si Server Interpreted
其中local那个是用来解决同一台机器的不同用户访问X的问题的。
3.proc: error while loading shared libraries: libclntsh.so.10.1:
cannot open shared object file: No such file or directory
解决方法：
在/etc/profile中添加
LD_LIBRARY_PATH=$ORACLE_HOME/lib:/usr/lib:/usr/local/lib;
export LD_LIBRARY_PATH
然后可以用source /etc/profile 生效一下
4、PCC-S-02201错误
在用proc进行编译的时候（proc iname=test.pc） 出错
错误信息有很多：
PCC-S-02201, Encountered the symbol ";" when expecting one of the following....
发生 PCC-S-02201 错误时有两种解决办法：
1)升级编译器
2)设置 parse=none
更正后的命令：proc iname=test.pc parse=none
结果生成test.c文件
5、error: sqlca.h: No such file or directory
执行gcc -o test test.c时：
test.c:152:19: error: sqlca.h: No such file or directory
sqlca.h在$ORACLE_HOME/precomp/public/下
更正后的命令：gcc -o test test.c -I $ORACLE_HOME/precomp/public
6、undefined reference to `sqlcxt'
执行5中的命令时出现错误如下：
test.c:(.text+0x5e5): undefined reference to `sqlcxt'
需要用到$ORACLE_HOME/lib/libclntsh.so
故需加上 -L $ORACLE_HOME/lib -l clntsh
更正后的命令为：
gcc -o test test.c -I /home/oracle/oracle/product/10.2.0/db_1/precomp/public -L $ORACLE_HOME/lib -l clntsh
OK!至此编译成功!
但是这样写太麻烦
7、自定义的结构体总是编译不过去，提示类型不对
我的环境是suse10sp2+oracle10g, 程序中定义了如下结构体，并在EXEC SQL中使用此结构体的变量
typedef struct Tjkjmlog{
char m_getdatatime[18 +1];
char m_monitorcode[6 +1];
char m_ip[23 +1];
char m_res[30+1];
char m_alarmlevel[2+1];
char m_info[128 +1];
}Tjkjmlog;
编译错误如下：
hrwang:~/test # proc iname=jkserv.pc
Pro*C/C++: Release 10.2.0.1.0 - Production on Mon Sep 27 10:15:46 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
System default option values taken from: /opt/or1/precomp/admin/pcscfg.cfg
Syntax error at line 491, column 2, file jkserv.pc:
Error at line 491, column 2 in file jkserv.pc
Tjkjmlog jmlog;
.1
PCC-S-02201, Encountered the symbol "Tjkjmlog" when expecting one of the followi
ng:
auto, char, const, double, enum, extern, float, int, long,
ulong_varchar, OCIBFileLocator OCIBlobLocator,
OCIClobLocator, OCIDateTime, OCIExtProcContext, OCIInterval,
OCIRowid, OCIDate, OCINumber, OCIRaw, OCIString, register,
short, signed, sql_context, sql_cursor, static, struct,
typedef, union, unsigned, utext, uvarchar, varchar, void,
volatile, a typedef name, a precompiled header, exec oracle,
exec oracle begin, exec, exec sql, exec sql begin,
exec sql end, exec sql type, exec sql var, exec sql include,
The symbol "enum," was substituted for "Tjkjmlog" to continue.
Error at line 0, column 0 in file jkserv.pc
PCC-F-02102, Fatal error while doing C preprocessing
自定义的结构体提示没有发现的错误，通常是由于结构体定义在了
EXEC SQL BEGIN DECLARE SECTION;
EXEC SQL END DECLARE SECTION;
这两个语句的外面，只要将结构体定义在这两句中间就可以了。如下：
EXEC SQL BEGIN DECLARE SECTION;
typedef struct Tjkjmlog{
char m_getdatatime[18 +1];
char m_monitorcode[6 +1];
char m_ip[23 +1];
char m_res[30+1];
char m_alarmlevel[2+1];
char m_info[128 +1];
}Tjkjmlog;
Tjkjmlog jmlog; /* 定义结构体变量 */
EXEC SQL END DECLARE SECTION;
8、proc编译时，提示相关的表需要声明
我的环境是在suse10sp2+oracle10g。 程序中使用exec sql insert into t_jm_err_his语句,编译时，总提示如下错误：
hrwang:~/test # proc iname=jkserv.pc
Pro*C/C++: Release 10.2.0.1.0 - Production on Mon Sep 27 09:42:53 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
System default option values taken from: /opt/or1/precomp/admin/pcscfg.cfg
Error at line 677, column 10 in file jkserv.pc
EXEC SQL insert into T_jm_err_his
.........1
PLS-S-00201, identifier 'T_JM_ERR_HIS' must be declared
Error at line 677, column 10 in file jkserv.pc
EXEC SQL insert into T_jm_err_his
.........1
PLS-S-00000, SQL Statement ignored
Semantic error at line 677, column 10, file jkserv.pc:
EXEC SQL insert into T_jm_err_his
.........1
PCC-S-02346, PL/SQL found semantic errors
出现这样的错误，我们可以proc iname=jkserv.pc userid=scott/hrwang来进行编译，
并且确保scott用户对这个表有权限（根据你的oracle情况更改用户名和密码）。或者你可以将userid=scott/hrwang 加入$oracle_home/precomp/admin/pcscfg.cfg文件中，这样在编译时就不用每次都指定了。
9、error while loading shared libraries: $ORACLE_HOME/lib/libnnz10.so:
cannot restore segment prot after reloc: Permission denied
执行程序（./test）时提示错误：
error while loading shared libraries: $ORACLE_HOME/lib/libnnz10.so:
cannot restore segment prot after reloc: Permission denied
相关的文章：
Topic:
Some Linux distributions with SELinux enabled may prevent IDL from running under the default security context. This TechTip is a workaround for CR#41937
Discussion:
Newer Linux distributions have enabled new kernel security extensions from the SELinux project at the NSA. These extensions allow finer-grained control over system security. However, SELinux also changes some default system behaviors, such as shared library loading, that can be problematic to third party programs.If you receive the error message "cannot restore segment prot after reloc: Permission denied" when launching IDL, then your SELinux configuration is preventing IDL from launching.
To rectify this issue, you can either:
（1）Change the default security context for IDL by issuing the command:
chcon -t texrel_shlib_t /usr/local/rsi/idl_6.1/bin/bin.linux.x86/*.so
（2）Disabling SELinux altogether by setting the line
SELINUX=disabled
in your /etc/sysconfig/selinux file.
我使用的解决办法：chcon -t texrel_shlib_t $ORACLE_HOME/lib/*.so
注：这篇文章很多内容是转自互联网，具体出处找不到了：（。 7、8是自己添加上去的。3、4、5、6这几个问题也都遇到并按照上述方法解决了。其它的还没有试过。
二、SUSE10SP2+ORACLE10G的PRO*C的环境设置
下面我再将自己配置suse10sp2+oracle10的proc环境进行一下说明，供大家参考：
(1)安装oracle这步我就省略了
(2)在/etc/profile文件中添加相关oracle环境变量设置：
ORACLE_SID=HRWANG
ORACLE_HOME=/opt/or1
LD_LIBRARY_PATH=/opt/or1/lib:/lib:/usr/lib:/usr/local/lib
PATH=$ORACLE_HOME/bin:$PATH
export ORACLE_SID ORACLE_HOME LD_LIBRARY_PATH PATH
上述环境变量应该根据你的情况进行调整，不能死搬硬套。更改完成后可以通过source /etc/profile来使其在当前shell中生效。
(3)更改$ORACLE_HOME/precomp/admin/pcscfg.cfg为如下内容：
sys_include=(/opt/or1/precomp/public,/usr/include,/usr/lib/gcc/i586-suse-linux/4.1.2/include,/usr/lib/gcc-lib/i486-suse-linux/2.95.3/include,/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/include,/usr/lib/gcc-lib/i386-redhat-linux7/2.96/include)
ltype=short
userid=scott/hrwang #数据库用户名密码，根据你的情况填写
mode=oracle
parse=none
sqlcheck=semantics
dbms=v8
def_sqlcode=true
此文件的sys_include中应包含sqlca.h所在的路径，我这里为/opt/or1/precomp/public。还需要包括stddef.h所在的路径，我这里为/usr/lib/gcc/i586-suse-linux/4.1.2/include。如果这两个文件你也不知道在什么位置，可以通过
#find / -name "sqlca.h"
#find / -name "stddef.h"
来查找。另外再将常用的头文件路径加上即可，如/usr/include。
