前提条件
1. Linux环境已经存在，安装好了Oracle
本demo 运行环境
本地环境 RedHat LINUX AS 4 ,ORACLE 10G
本地数据库sid orcl,ip:127.0.0.1,用户名:kingbi，密码：kingbi,表dsd_test. 显示表dsd_test 的所有记录.
步骤：
(1) 创建表 create table dsd_test(aa char(3)); insert into dsd_test values('123');insert into dsd_test values('456');
被配置本地命名服务($ORACLE_HOME/network/admin/tnsnames.ora
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)
(2) 修改配置文件 /etc/profile (用root用户修改，增加 2句代码
...
export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC
export ORACLE_HOME=........ #以下2行为新加
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/usr/lib #这句很关键
.....
(3) 更改$ORACLE_HOME/precomp/admin/pcscfg.cfg (include= 开头的语句为新加的，,/usr/lib/gcc/i386-redhat-linux/3.4.3/include 也是新加的) www.linuxidc.com
sys_include=(/ade/aime_rdbms_9819/oracle/precomp/public,/usr/include,/usr/lib/gcc-lib/i486-SUSE-linux/2.95.3/include,/usr/lib/gcc-lib/i386-redhat-linux/3.2.3/include,/usr/lib/gcc-lib/i386-redhat-linux7/2.96/include,/usr/lib/gcc/i386-redhat-linux/3.4.3/include)
include=$ORACLE_HOME/lib
include=$ORACLE_HOME/precomp/precomp/include
include=$ORACLE_HOME/precomp/oracore/include
include=$ORACLE_HOME/precomp/oracore/public
include=$ORACLE_HOME/precomp/rdbms/include
include=$ORACLE_HOME/precomp/rdbms/public
include=$ORACLE_HOME/precomp/rdbms/demo
include=$ORACLE_HOME/precomp/nlsrtl/include
include=$ORACLE_HOME/precomp/nlsrtl/public
include=$ORACLE_HOME/precomp/network_src/include
include=$ORACLE_HOME/precomp/network_src/public
include=$ORACLE_HOME/precomp/network/include
include=$ORACLE_HOME/precomp/network/public
include=$ORACLE_HOME/precomp/plsql/public
ltype=short
(4) 编写c 程序 test.pc文件 www.linuxidc.com
#include
EXEC SQL INCLUDE SQLCA;
int main()
{
//声明SQL变量
EXEC SQL BEGIN DECLARE SECTION;
VARCHAR user[20],pass[20],tnsname[20];
//VARCHAR预编译后为struct { unsigned short len; unsigned char arr[20];}
char ename[20];
EXEC SQL END DECLARE SECTION;
//声明结束
int i=0;
strcpy(user.arr,"kingbi");
user.len=(unsigned short)strlen((char *)user.arr);
strcpy(pass.arr,"kingbi");
pass.len=(unsigned short)strlen((char *)pass.arr);
strcpy(tnsname.arr,"orcl");
tnsname.len=(unsigned short)strlen((char *)tnsname.arr);
//连接数据库
EXEC SQL CONNECT :user IDENTIFIED BY :pass USING :tnsname;
//执行查询
EXEC SQL declare emp_cursor cursor for
select aa from kingbi.test;
EXEC SQL open emp_cursor;
EXEC SQL WHENEVER NOT FOUND DO break;
while(1)
{
EXEC SQL fetch emp_cursor into :empno,:ename;
printf("the name is %s\n",ename);
i=i+1;
}
printf("Yeah!We get %d records\n",i);
EXEC SQL close emp_cursor;
EXEC SQL commit work release;
}
(5) 预编译 ，编译后会生成 .c文件
proc test.pc
(6)编译
gcc -o test test.c $ORACLE_HOME/lib/libclntsh.so
(6) 运行生成的可执行文件
./test
输出：
the name is 123
the name is 456
Yeah!We get 2 records
