c oracle录入

C和Oracle是两个非常重要的编程工具，可以用来实现大量的计算机应用程序。在一些特定的应用场合，我们需要将C语言程序和Oracle数据库进行集成操作来实现一些专业的功能。在这样的情况下，我们需要掌握如何使用C语言进行Oracle数据库的录入操作。

例如，一个人力资源系统需要通过C程序将新员工信息录入到Oracle数据库中。这时，我们可以使用OCI（Oracle C语言接口）完成该操作。首先，我们需要在C程序中声明OCI所需要的指针变量：

OCIEnv *envhp;
    OCIError *errhp;
    OCIServer *srvhp;
    OCISession *usrhp;
    OCIStmt *stmthp;
    

然后，我们需要建立与数据库的连接：

OCIEnvCreate(&
    envhp, OCI_THREADED, (dvoid *)0, (dvoid * (*)(dvoid *, size_t))0,(dvoid * (*)(dvoid *, dvoid *, size_t))0, (void (*)(dvoid *, dvoid *))0, 0, (dvoid **)0);
    OCIHandleAlloc((dvoid *)envhp, (dvoid **)&
    errhp, OCI_HTYPE_ERROR, 0, (dvoid **)0);
    OCIHandleAlloc((dvoid *)envhp, (dvoid **)&
    srvhp, OCI_HTYPE_SERVER, 0, (dvoid **)0);
    OCIHandleAlloc((dvoid *)envhp, (dvoid **)&
    usrhp, OCI_HTYPE_SESSION, 0, (dvoid **)0);
    

接下来，我们需要登录数据库并执行SQL语句：

char *username = "SCOTT";
    char *password = "TIGER";
    char *dbname = "ORCL";
    OCIAttrSetName((dvoid *)srvhp, OCI_HTYPE_SERVER, (dvoid *)"dbname", (ub4)strlen((char *)"dbname"), OCI_ATTR_SERVICENAME, errhp);
    OCIServerAttach(srvhp, errhp, (text *)dbname, strlen((char *)dbname), OCI_DEFAULT);
    OCIAttrSet((dvoid *)usrhp, OCI_HTYPE_SESSION, (dvoid *)username, strlen(username), OCI_ATTR_USERNAME, errhp);
    OCIAttrSet((dvoid *)usrhp, OCI_HTYPE_SESSION, (dvoid *)password, strlen(password), OCI_ATTR_PASSWORD, errhp);
    OCISessionBegin(srvhp, errhp, usrhp, OCI_CRED_RDBMS, OCI_DEFAULT);
    OCIHandleAlloc((dvoid *)envhp, (dvoid **)&
    stmthp, OCI_HTYPE_STMT, 0, (dvoid **)0);
    OCIStmtPrepare(stmthp, errhp, "INSERT INTO emp(empno, ename, job, mgr, hiredate, sal, comm, deptno) VALUES (:1, :2, :3, :4, :5, :6, :7, :8)", (ub4)strlen("INSERT INTO emp(empno, ename, job, mgr, hiredate, sal, comm, deptno) VALUES (:1, :2, :3, :4, :5, :6, :7, :8)"), OCI_NTV_SYNTAX, OCI_DEFAULT);
    

最后，我们可以使用OCIBindByName函数绑定变量并执行SQL语句：

OCIBind *bnd1p, *bnd2p, *bnd3p, *bnd4p, *bnd5p, *bnd6p, *bnd7p, *bnd8p;
    OCIStmtBindByPos(stmthp, &
    bnd1p, errhp, 1, (dvoid *)&
    empno, sizeof(empno), SQLT_INT, (dvoid *)0, (ub2 *)0, (ub2 *)0, OCI_DEFAULT);
    OCIStmtBindByName(stmthp, &
    bnd2p, errhp, (text *)":ename", -1, (dvoid *)ename, sizeof(ename), SQLT_STR, (dvoid *)0, (ub2 *)0, (ub2 *)0, OCI_DEFAULT);
    OCIStmtBindByName(stmthp, &
    bnd3p, errhp, (text *)":job", -1, (dvoid *)job, sizeof(job), SQLT_STR, (dvoid *)0, (ub2 *)0, (ub2 *)0, OCI_DEFAULT);
    OCIStmtBindByName(stmthp, &
    bnd4p, errhp, (text *)":mgr", -1, (dvoid *)&
    mgr, sizeof(mgr), SQLT_INT, (dvoid *)0, (ub2 *)0, (ub2 *)0, OCI_DEFAULT);
    OCIStmtBindByName(stmthp, &
    bnd5p, errhp, (text *)":hiredate", -1, (dvoid *)&
    hiredate, sizeof(hiredate), SQLT_DAT, (dvoid *)0, (ub2 *)0, (ub2 *)0, OCI_DEFAULT);
    OCIStmtBindByName(stmthp, &
    bnd6p, errhp, (text *)":sal", -1, (dvoid *)&
    sal, sizeof(sal), SQLT_FLT, (dvoid *)0, (ub2 *)0, (ub2 *)0, OCI_DEFAULT);
    OCIStmtBindByName(stmthp, &
    bnd7p, errhp, (text *)":comm", -1, (dvoid *)&
    comm, sizeof(comm), SQLT_FLT, (dvoid *)0, (ub2 *)0, (ub2 *)0, OCI_DEFAULT);
    OCIStmtBindByName(stmthp, &
    bnd8p, errhp, (text *)":deptno", -1, (dvoid *)&
    deptno, sizeof(deptno), SQLT_INT, (dvoid *)0, (ub2 *)0, (ub2 *)0, OCI_DEFAULT);
    OCIStmtExecute(usrhp, stmthp, errhp, 1, 0, (OCISnapshot *)NULL, (OCISnapshot *)NULL, OCI_DEFAULT);
    

总之，使用C语言进行Oracle数据库录入操作需要了解OCI接口的基本知识，掌握连接、登录、SQL语句的执行以及变量绑定等操作，并且需要按照Oracle官方文档指导进行程序编写。只有这样才能够快速高效地完成数据库录入操作，提高生产效率。

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