1
2 #include "oci.h"
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <string.h>
6
7
8 void myfflush()
9 {
10 eb1 buf[50];
11 fgets((char *) buf, 50, stdin);
12 }
13
14 int main()
15 {
16 OCIEnv *m_envhp;
17 OCIError *m_errhp;
18 OCIServer *m_srvhp;
19 OCISvcCtx *m_svchp;
20 OCIStmt *m_stmthp;
21 OCIBind *bnd1p = NULL;
22 OCIBind *bnd2p = NULL;
23
24 char username[255];
25 char password[30];
26 char dbname[30];
27 char szSqlStr[255];
28 char empname[100];
29 char empno[10];
30
31 strcpy(username,"liugang");
32 strcpy(password,"LiuGang");
33 strcpy(dbname,"LinkAge");
34
35 int i;
36 for(i=0;i<100;i++)
37 empname[i]='\0';
38
39 OCIInitialize((ub4)OCI_DEFAULT,(dvoid *)0,(dvoid *(*)(dvoid *,size_t))0,(dvoid *(*)(dvoid *,dvoid *,size_t))0,(void (*)(dvoid *,dvoid *)) 0 );
40 OCIEnvInit((OCIEnv **)&m_envhp, OCI_DEFAULT, (size_t) 0,(dvoid **) 0 );
41
42 OCIHandleAlloc( (dvoid *)m_envhp, (dvoid **)&m_errhp,OCI_HTYPE_ERROR,(size_t) 0, (dvoid **) 0);
43 OCIHandleAlloc( (dvoid *)m_envhp, (dvoid **)&m_srvhp,OCI_HTYPE_SERVER,(size_t) 0, (dvoid **) 0);
44 OCIHandleAlloc( (dvoid *)m_envhp, (dvoid **)&m_svchp,OCI_HTYPE_SVCCTX,(size_t) 0, (dvoid **) 0);
45 OCIHandleAlloc( (dvoid *)m_envhp, (dvoid **)&m_stmthp,OCI_HTYPE_STMT,(size_t) 0, (dvoid **)0);
46
47 OCIServerAttach(m_srvhp, m_errhp,(text *)dbname, strlen(dbname),(ub4) OCI_DEFAULT);
48 OCILogon(m_envhp,m_errhp,&m_svchp,(text *)username,strlen(username),(text *)password,strlen(password),(text *)dbname,strlen(dbname));
49
50 OCIDefine *defnp0 = (OCIDefine *) 0;
51
52 printf("Please input your emp number:");
53 scanf("%s",empno);
54
55 myfflush();
56
57
58 sprintf( szSqlStr,"%s", "SELECT ENAME FROM EMP WHERE EMPNO = :empno");
59
60 OCIStmtPrepare(m_stmthp, m_errhp, (text*)szSqlStr, (ub4)strlen(szSqlStr),(ub4) OCI_NTV_SYNTAX, (ub4)OCI_DEFAULT);
61 int m =sizeof(empno);
62
63 //OCIBindByName(m_stmthp, &bnd1p, m_errhp, (text *)":empno",-1, (ub1 *) empno,(sword) sizeof(empno)-1, SQLT_CHR, (dvoid *) 0,(ub2 *) 0, (ub2) 0, (ub4) 0, (ub4 *) 0, OCI_DEFAULT);
64
65 OCIBindByPos(m_stmthp, &bnd1p, m_errhp, 1, (dvoid *)empno, sizeof(empno)-1, SQLT_CHR, 0, 0, 0, 0, 0, (ub4) OCI_DEFAULT);
66
67 OCIDefineByPos( m_stmthp, &defnp0, m_errhp, 1, (dvoid *)empname, 100, SQLT_STR,(dvoid *) 0, (ub2 *)0, (ub2 *)0, OCI_DEFAULT);
68
69 OCIStmtExecute( m_svchp, m_stmthp, m_errhp, (ub4) 1, (ub4) 0,(OCISnapshot *) NULL,(OCISnapshot *) NULL, (ub4) OCI_DEFAULT);
70
71 OCILogoff( m_svchp, m_errhp );
72 if(empname[0]=='\0')
73 strcpy(empname,"无此人");
74 printf("The employee name is:%s",empname);
75
76 OCIServerDetach( m_srvhp, m_errhp, OCI_DEFAULT );
77 OCIHandleFree((dvoid *) m_stmthp, OCI_HTYPE_STMT);
78 OCIHandleFree((dvoid *) m_svchp, OCI_HTYPE_SVCCTX);
79 OCIHandleFree((dvoid *) m_srvhp, OCI_HTYPE_SERVER);
80 OCIHandleFree((dvoid *) m_errhp, OCI_HTYPE_ERROR);
81 getchar();
82 return 1;
83 }
84
在对:empno变量进行绑定的时候，和以往差不多，有按名称绑定和位置绑定两种方法，在上面代码中使用的是按位置进行的绑定，按名称进行绑定被注释了，有兴趣的可以自己研究一下，文档中推荐使用的是按位置绑定，具体的原因还没有查清楚，希望知情者提供线索......
运行结果如下：
在这里还存在这样一个问题：SELECT ENAME FROM EMP WHERE EMPNO = :empno不可以写成SELECT ENAME FROM EMP WHERE EMPNO = ':empno'，虽然在数据库中EMPNO是VARCHAR2类型的，我个人认为在使用OCIBindByPos的时候，已经指定了绑定的变量是SQLT_CHR类型的，所以就没有必要在语句中使用':empno'了，这只是一家之言，希望有不同想法的同志可以提出，共同讨论......
posted on 2007-05-25 14:48
LG 阅读(829)
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