C语言打开Oracle数据库
1、简述：用C语言连接ORACLE数据库。有两个思路和目的
2、思路一）本地环境：UBUNTU 7.04,ORACLE 10G目的:用C语连接本地数据库sid:umail,ip:127.0.0.1,用户名:umail，密码:umail,表tt1.显示表tt1的所有记录.
思路二）远程环境服务器1：linux es3远程数据库：oracle9i目的:在远程一台服务器上，再远程连接数据库，用户名和表同上显示表tt1的所有记录.
3、 查看/etc/profile文件
export ORACLE_BASE=/share/oracleexport ORACLE_HOME=$ORACLE_BASE/product/10.2.1export ORACLE_SID=umailexport PATH=$PATH:$HOME/bin:$ORACLE_HOME/binexport LD_LIBRARY_PATH=$ORACLE_HOME/lib:/usr/lib:$LD_LIBRARY_PATHexport JAVA_HOME=/share/jdkexport AWT_TOOLKIT=MToolkit作用：解决tnsnames.ora问题
4、更改$ORACLE_HOME/precomp/admin/pcscfg.cfgsys_include=(/usr/include,/usr/lib/gcc/i486-linux-gnu/4.1.2/include,/usr/lib/gcc/i486-linux-gnu/3.4.6/include,/share/oracle/product/10.2.1/precomp/public,/usr/include/sys)include=(/share/oracle/product/10.2.1/precomp/public)include=/share/oracle/product/10.2.1/precomp/hdrsinclude=/share/oracle/product/10.2.1/tpcc2x_2/srcinclude=/share/oracle/product/10.2.1/precomp/precomp/includeinclude=/share/oracle/product/10.2.1/precomp/oracore/includeinclude=/share/oracle/product/10.2.1/precomp/oracore/publicinclude=/share/oracle/product/10.2.1/precomp/rdbms/includeinclude=/share/oracle/product/10.2.1/precomp/rdbms/publicinclude=/share/oracle/product/10.2.1/precomp/rdbms/demoinclude=/share/oracle/product/10.2.1/precomp/nlsrtl/includeinclude=/share/oracle/product/10.2.1/precomp/nlsrtl/publicinclude=/share/oracle/product/10.2.1/precomp/network_src/includeinclude=/share/oracle/product/10.2.1/precomp/network_src/publicinclude=/share/oracle/product/10.2.1/precomp/network/includeinclude=/share/oracle/product/10.2.1/precomp/network/publicinclude=/share/oracle/product/10.2.1/precomp/plsql/publicltype=short
5、新test.pc文件，如下:
#include <stdio.h>
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]; int empno; EXEC SQL END DECLARE SECTION; //声明C变量 int i=0; //变量赋值 strcpy(user.arr,"umail"); user.len=(unsigned short)strlen((char *)user.arr); strcpy(pass.arr,"umail"); pass.len=(unsigned short)strlen((char *)pass.arr); strcpy(tnsname.arr,"umail"); tnsname.len=(unsigned short)strlen((char *)tnsname.arr); //连接数据库 EXEC SQL CONNECT :user IDENTIFIED BY :pass USING :tnsname;
EXEC SQL declare emp_cursor cursor for select id,ename from umail.tt1;
EXEC SQL open emp_cursor;
EXEC SQL WHENEVER NOT FOUND DO break;
while(1) { EXEC SQL fetch emp_cursor into :empno,:ename; printf("the empno %d\'s name is %s\n",empno,ename); i=i+1; } printf("Yeah!We get %d records\n",i);
EXEC SQL close emp_cursor; EXEC SQL commit work release;}
6、更改tnsname文件如下:
UMAIL = (DEscrīptION = (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = umail) ) )
EXTPROC_CONNECTION_DATA = (DEscrīptION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0)) ) (CONNECT_DATA = (SID = PLSExtProc) (PRESENTATION = RO) ) )
7、编译方法:预编译 proc test.pc注：这步是依赖于$ORACLE_HOME/precomp/admin/pcscfg.cfg
编译:gcc -o test test.c $ORACLE_HOME/lib/libclntsh.so
8、执行测试testcd /tmp;./test
9、以上就是小编带给大家用C语言打开Oracle数据库关键所在，希望大家可以喜欢，如果喜欢的话可以点赞哦，也可以发表自己的看法。