c oracle 界面
导读：C语言和Oracle数据库结合起来，可以实现强大的功能，为企业级应用提供行业标准的用户界面。C语言的高级、可移植特性与Oracle数据库的安全、性能稳定性被结合在一起，可以让开发者更高效、精确地构建数据驱动型应用程序。使用C语言调用Orac...
C语言和Oracle数据库结合起来，可以实现强大的功能，为企业级应用提供行业标准的用户界面。C语言的高级、可移植特性与Oracle数据库的安全、性能稳定性被结合在一起，可以让开发者更高效、精确地构建数据驱动型应用程序。使用C语言调用Oracle提供的API接口，可以轻松地执行数据库查询、更新、删除等操作。用户可以通过C语言和Oracle数据库进行界面处理。下面是一个示例，演示了如何在C语言中访问Oracle数据库并显示数据：#include stdio.h>
#include stdlib.h>
#include string.h>
#include oci.h>
#define MAX_BUF 100void checkerr(OCIError *errhp, sword status){
text errbuf[MAX_BUF];
ub4 buflen;
sb4 errcode;
switch (status){
case OCI_SUCCESS:break;
case OCI_SUCCESS_WITH_INFO:printf("Error - OCI_SUCCESS_WITH_INFO\n");
break;
case OCI_NEED_DATA:printf("Error - OCI_NEED_DATA\n");
break;
case OCI_NO_DATA:printf("Error - OCI_NO_DATA\n");
break;
case OCI_ERROR:OCIErrorGet ((dvoid *) errhp, (ub4) 1, (text *) NULL, &
errcode,errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);
printf("Error - %.*s\n", 512, errbuf);
break;
case OCI_INVALID_HANDLE:printf("Error - OCI_INVALID_HANDLE\n");
break;
case OCI_STILL_EXECUTING:printf("Error - OCI_STILL_EXECUTE\n");
break;
case OCI_CONTINUE:printf("Error - OCI_CONTINUE\n");
break;
default:break;
}
}
int main(int argc, char *argv[]){
OCIEnv *envhp;
OCIServer *srvhp;
OCIError *errhp;
OCISession *sesshp;
OCIStmt *stmthp;
OCIDefine *defnp;
ub4 htype = OCI_HTYPE_STMT;
sb4 status;
text username[MAX_BUF], password[MAX_BUF], dbname[MAX_BUF];
strcpy((char *) username, "your_username");
strcpy((char *) password, "your_password");
strcpy((char *) dbname, "your_dbname");
OCIInitialize ((ub4) OCI_DEFAULT, (dvoid *) 0, (dvoid * (*)(dvoid *, size_t)) 0,(dvoid * (*)(dvoid *, dvoid *, size_t)) 0, (void (*)(dvoid *, dvoid *)) 0 );
OCIEnvInit ((OCIEnv **) &
envhp, OCI_DEFAULT, (size_t) 0, (dvoid **) 0 );
OCIHandleAlloc ((dvoid *) envhp, (dvoid **) &
errhp, OCI_HTYPE_ERROR, (size_t) 0, (dvoid **) 0);
OCIHandleAlloc ((dvoid *) envhp, (dvoid **) &
srvhp, OCI_HTYPE_SERVER, (size_t) 0, (dvoid **) 0);
OCIHandleAlloc ((dvoid *) envhp, (dvoid **) &
sesshp, OCI_HTYPE_SESSION, (size_t) 0, (dvoid **) 0);
OCIHandleAlloc ((dvoid *) envhp, (dvoid **) &
stmthp, OCI_HTYPE_STMT, (size_t) 0, (dvoid **) 0);
OCIServerAttach (srvhp, errhp, (text *) dbname, (sb4) strlen((char *) dbname), OCI_DEFAULT);
OCIAttrSet ((dvoid *) sesshp, (ub4) OCI_HTYPE_SESSION, (dvoid *) username,(ub4) strlen ((char *) username), OCI_ATTR_USERNAME, errhp);
OCIAttrSet ((dvoid *) sesshp, (ub4) OCI_HTYPE_SESSION, (dvoid *) password,(ub4) strlen ((char *) password), OCI_ATTR_PASSWORD, errhp);
status = OCISessionBegin (srvhp, errhp, sesshp, OCI_CRED_RDBMS, OCI_DEFAULT);
checkerr(errhp, status);
OCIStmtPrepare(stmthp, errhp, (text *) "SELECT * FROM MYTABLE", (ub4) strlen((char *) "SELECT * FROM MYTABLE"),(ub4) OCI_NTV_SYNTAX, (ub4) OCI_DEFAULT);
status = OCIStmtExecute((OCISvcCtx *) sesshp, stmthp, errhp, (ub4) 0, (ub4) 0,(CONST OCISnapshot *) NULL, (OCISnapshot *) NULL, OCI_DEFAULT);
checkerr(errhp, status);
OCIHandleAlloc ((dvoid *)envhp, (dvoid **)&
defnp, OCI_HTYPE_DEFINE, (size_t)0, (dvoid **) 0);
OCIStmtGetPieceInfo(stmthp, errhp, &
htype, &
defnp, (ub4 *)&
status, OCI_PIECE_DEFINE, OCI_DEFAULT);
printf("Data from MYTABLE:\n");
while(status != OCI_NO_DATA){
status = OCIStmtFetch(stmthp, errhp, 1, OCI_FETCH_NEXT, OCI_DEFAULT);
if(status == OCI_NO_DATA)break;
printf("%-20s %-20s %-20s\n", text1, text2, text3);
}
OCISessionEnd(sesshp, errhp, srvhp, OCI_DEFAULT);
OCIServerDetach(srvhp, errhp, OCI_DEFAULT);
OCIHandleFree((dvoid *) envhp, OCI_HTYPE_ENV);
OCIHandleFree((dvoid *) errhp, OCI_HTYPE_ERROR);
OCIHandleFree((dvoid *) srvhp, OCI_HTYPE_SERVER);
OCIHandleFree((dvoid *) sesshp, OCI_HTYPE_SESSION);
OCIHandleFree((dvoid *) stmthp, OCI_HTYPE_STMT);
return 0;
}
上述代码演示了如何使用C语言和Oracle数据库交互的过程，展现了如何使用OCI进行连接、数据库操作，并最终获取数据库中的数据并进行显示。可以看到，C语言与Oracle数据库相结合可以实现丰富的应用程序功能，提升企业应用程序的性能，稳定性和安全性，满足企业需求。
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