可以参考下这个：https://eco.dameng.com/document/dm/zh-cn/app-dev/c_c++_dpi.html

连接句柄中属性DSQL_ATTR_AUTOCOMMIT的代码示例

主要两点：

1. OCIAttrSet函数给DCIStmt设置手动提交属性

 //   OCI_COMMIT_ON_SUCCESS：表示在执行SQL语句成功后自动提交事务。这是OCI_ATTR_AUTOCOMMIT属性的默认值。
 //   OCI_ATTR_NONFATAL_MODE：表示关闭自动提交事务，需要手动提交事务
  ub4 autocommit = OCI_ATTR_NONFATAL_MODE;
  OCIAttrSet(stmthp, OCI_HTYPE_STMT, &autocommit, sizeof(autocommit), OCI_ATTR_AUTOCOMMIT, errhp);

2. OCITransCommit函数手动提交事务

OCITransCommit(svchp, errhp, OCI_DEFAULT);

//
// Created by gy on 2023-05-08.
//

#include "oci_demo.h"

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#include "DCI.h"

// 声明句柄
DCIEnv* envhp;				/* 环境句柄 */
DCISvcCtx* svchp;			/* 服务环境句柄 */
DCIServer* srvhp;			/* 服务器句柄 */
DCISession* authp;			/* 会话句柄 */
DCIStmt* stmthp;			/* 语句句柄 */
DCIDescribe* dschp;			/* 描述句柄 */
DCIError* errhp;			/* 错误句柄 */
DCIDefine* defhp[3];		/* 定义句柄 */
DCIBind* bidhp[4];			/* 绑定句柄 */
sb2 ind[3];					/* 指示符变量 */

// 绑定select结果集的参数
text szpersonid[11];		/* 存储personid列 */
text szsex[2];				/* 存储sex列 */
text szname[51];			/* 存储name列 */
text szemail[51];			/* 存储mail列 */
text szphone[26];			/* 存储phone列 */
char sql[256];				/* 存储执行的sql语句 */


int main(int argc, char* argv[])
{
    char strServerName[50];
    char strUserName[50];
    char strPassword[50];
    int ret;
    text errbuf[100];
   // ub4 autocommit = OCI_COMMIT_ON_SUCCESS;
    ub4 autocommit = OCI_ATTR_NONFATAL_MODE;
    // 设置服务器，用户名和密码
    strcpy(strServerName, "localhost");
    strcpy(strUserName, "SYSDBA");
    strcpy(strPassword, "SYSDBA");

    // 初始化OCI应用环境
    OCIInitialize(OCI_DEFAULT, NULL, NULL, NULL, NULL);

    // 初始化环境句柄
    OCIEnvInit(&envhp, OCI_DEFAULT, 0, 0);

    // 分配句柄
    OCIHandleAlloc(envhp, (dvoid**)&svchp, OCI_HTYPE_SVCCTX, 0, 0);			/* 服务器环境句柄 */
    OCIHandleAlloc(envhp, (dvoid**)&srvhp, OCI_HTYPE_SERVER, 0, 0);			/* 服务器句柄 */
    OCIHandleAlloc(envhp, (dvoid**)&authp, OCI_HTYPE_SESSION, 0, 0);		/* 会话句柄 */
    OCIHandleAlloc(envhp, (dvoid**)&errhp, OCI_HTYPE_ERROR, 0, 0);			/* 错误句柄 */
    OCIHandleAlloc(envhp, (dvoid**)&dschp, OCI_HTYPE_DESCRIBE, 0, 0);		/* 描述符句柄 */

    // 连接服务器
    OCIServerAttach(srvhp, errhp, (text*)strServerName,
                    (sb4)strlen(strServerName), OCI_DEFAULT);

    // 设置用户名和密码
    OCIAttrSet(authp, OCI_HTYPE_SESSION, (text*)strUserName,
               (ub4)strlen(strUserName), OCI_ATTR_USERNAME, errhp);
    OCIAttrSet(authp, OCI_HTYPE_SESSION, (text*)strPassword,
               (ub4)strlen(strPassword), OCI_ATTR_PASSWORD, errhp);

    // 设置服务器环境句柄属性
    OCIAttrSet((dvoid*)svchp, (ub4)OCI_HTYPE_SVCCTX,
               (dvoid*)srvhp, (ub4)0, OCI_ATTR_SERVER, errhp);
    OCIAttrSet(svchp, OCI_HTYPE_SVCCTX, (dvoid*)authp, 0,
               OCI_ATTR_SESSION, errhp);

    // 设置DSQL_ATTR_AUTOCOMMIT属性
    OCIAttrSet(stmthp, OCI_HTYPE_STMT, &autocommit, sizeof(autocommit), OCI_ATTR_AUTOCOMMIT, errhp);




    // 创建并开始一个用户会话
    OCISessionBegin(svchp, errhp, authp, OCI_CRED_RDBMS, OCI_DEFAULT);
    OCIHandleAlloc(envhp, (dvoid**)&stmthp, OCI_HTYPE_STMT, 0, 0);			/* 语句句柄 */

    /************************************************************************/
    /* 查询person表															*/
    /************************************************************************/

    strcpy(sql, "select personid, name, phone from sysdba.person");

    // 准备SQL语句
    OCIStmtPrepare(stmthp, errhp, (text*)sql, strlen(sql), OCI_NTV_SYNTAX, OCI_DEFAULT);

    // 绑定输出列
    OCIDefineByPos(stmthp, &defhp[0], errhp, 1, (ub1*)szpersonid,
                   sizeof(szpersonid), SQLT_STR, &ind[0], 0, 0, OCI_DEFAULT);
    OCIDefineByPos(stmthp, &defhp[1], errhp, 2, (ub1*)szname,
                   sizeof(szname), SQLT_STR, &ind[1], 0, 0, OCI_DEFAULT);
    OCIDefineByPos(stmthp, &defhp[2], errhp, 3, (ub1*)szphone,
                   sizeof(szphone), SQLT_STR, &ind[2], 0, 0, OCI_DEFAULT);

    // 执行SQL语句
    ret = OCIStmtExecute(svchp, stmthp, errhp, (ub4)0, 0, NULL, NULL, OCI_DEFAULT);
    if (ret != 0)
    {
        OCIErrorGet(errhp, 1, NULL, &ret, (OraText*)errbuf, sizeof(errbuf), OCI_HTYPE_ERROR);
        printf("\n%s\n", errbuf);
    }
    printf("%-10s%-10s%-10s\n", "PERSONID", "NAME", "PHONE");
    while ((OCIStmtFetch(stmthp, errhp, 1, OCI_FETCH_NEXT, OCI_DEFAULT)) != OCI_NO_DATA)
    {
        printf("%-10s", szpersonid);
        printf("%-10s", szname);
        printf("%-10s\n", szphone);
    }

    /************************************************************************/
    /* 向person表插入一条数据												*/
    /************************************************************************/

    memset(sql, 0, sizeof(sql));
    strcpy(sql, "insert into sysdba.person(sex, name, email, phone) values(:sex,:name,:email,:phone)");

    // 准备SQL语句
    OCIStmtPrepare(stmthp, errhp, (text*)sql, strlen(sql), OCI_NTV_SYNTAX, OCI_DEFAULT);

    // 设置输入参数
    memset(szsex, 0, sizeof(szsex));
    memcpy(szsex, "M", strlen("M") + 1);
    memset(szname, 0, sizeof(szname));
    memcpy(szname, "张三", strlen("张三") + 1);
    memset(szemail, 0, sizeof(szemail));
    memcpy(szemail, "zhangsan@dameng.com", strlen("zhangsan@dameng.com") + 1);
    memset(szphone, 0, sizeof(szphone));
    memcpy(szphone, "02712345678", strlen("02712345678") + 1);

    // 绑定输入列
    const OraText col_sex[] = ":sex";
    const OraText col_name[] = ":name";
    const OraText col_email[] = ":email";
    const OraText col_phone[] = ":phone";
    OCIBindByName(stmthp, &bidhp[0], errhp, col_sex, 4, szsex,
                  strlen((char*)szsex), SQLT_AFC, NULL, NULL, NULL, 0, NULL, 0);
    OCIBindByName(stmthp, &bidhp[1], errhp, col_name, 5, szname,
                  strlen((char*)szname), SQLT_AFC, NULL, NULL, NULL, 0, NULL, 0);
    OCIBindByName(stmthp, &bidhp[2], errhp, col_email, 6, szemail,
                  strlen((char*)szemail), SQLT_AFC, NULL, NULL, NULL, 0, NULL, 0);
    OCIBindByName(stmthp, &bidhp[3], errhp, col_phone, 6, szphone,
                  strlen((char*)szphone), SQLT_AFC, NULL, NULL, NULL, 0, NULL, 0);

    // 执行SQL语句
    ret = OCIStmtExecute(svchp, stmthp, errhp, (ub4)1, (ub4)0,
                         (CONST OCISnapshot*) 0, (OCISnapshot*)0, (ub4)OCI_DEFAULT);
    if (ret != 0)
    {
        OCIErrorGet(errhp, 1, NULL, &ret, (OraText*)errbuf, sizeof(errbuf), OCI_HTYPE_ERROR);
        printf("\n%s\n", errbuf);
    }
    else
    {
        printf("\n新增了 name = 张三 的记录。\n");
    }

    // 提交到数据库
    OCITransCommit(svchp, errhp, OCI_DEFAULT);


    /************************************************************************/
    /* 更新person表															*/
    /************************************************************************/

    memset(sql, 0, sizeof(sql));
    strcpy(sql, "update sysdba.person set sex='M',name='Liuhuan',email='12345678@qq.com',phone='13399990000' WHERE personid='1'");

    // 准备SQL语句
    OCIStmtPrepare(stmthp, errhp, (text*)sql, strlen(sql), OCI_NTV_SYNTAX, OCI_DEFAULT);

    // 执行SQL语句
    ret = OCIStmtExecute(svchp, stmthp, errhp, (ub4)1, (ub4)0,
                         (CONST OCISnapshot*)0, (OCISnapshot*)0, (ub4)OCI_DEFAULT);
    if (ret != 0)
    {
        OCIErrorGet(errhp, 1, NULL, &ret, (OraText*)errbuf, sizeof(errbuf), OCI_HTYPE_ERROR);
        printf("\n%s\n", errbuf);
    }
    else
    {
        printf("\n更新了 personid = 1 的记录。\n");
    }

    // 提交到数据库
    OCITransCommit(svchp, errhp, OCI_DEFAULT);


    /************************************************************************/
    /* 删除person表的ID为5的记录，首先要在数据库中存在这条记录				*/
    /************************************************************************/

    memset(sql, 0, sizeof(sql));
    strcpy(sql, "delete from sysdba.person WHERE personid=:1");

    // 准备SQL语句
    OCIStmtPrepare(stmthp, errhp, (text*)sql, strlen(sql), OCI_NTV_SYNTAX, OCI_DEFAULT);

    // 绑定输入参数
    memset(szpersonid, 0, sizeof(szpersonid));
    memcpy(szpersonid, "5", strlen("5") + 1);
    OCIBindByPos(stmthp, &bidhp[0], errhp, 1, szpersonid, strlen((char*)szpersonid),
                 SQLT_AFC, NULL, NULL, NULL, 0, NULL, 0);

    // 执行SQL语句
    ret = OCIStmtExecute(svchp, stmthp, errhp, (ub4)1, (ub4)0,
                         (CONST OCISnapshot*) 0, (OCISnapshot*)0, (ub4)OCI_DEFAULT);
    if (ret != 0)
    {
        OCIErrorGet(errhp, 1, NULL, &ret, (OraText*)errbuf, sizeof(errbuf), OCI_HTYPE_ERROR);
        printf("\n%s\n", errbuf);
    }
    else
    {
        printf("\n删除了 personid = 5 的记录。\n");
    }

    // 提交到数据库
    OCITransCommit(svchp, errhp, OCI_DEFAULT);


    /************************************************************************/
    /* 再次查询person表														*/
    /************************************************************************/

    strcpy(sql, "select personid, name, phone from sysdba.person");

    // 准备SQL语句
    OCIStmtPrepare(stmthp, errhp, (text*)sql, strlen(sql), OCI_NTV_SYNTAX, OCI_DEFAULT);

    // 绑定输出列
    OCIDefineByPos(stmthp, &defhp[0], errhp, 1, (ub1*)szpersonid,
                   sizeof(szpersonid), SQLT_STR, &ind[0], 0, 0, OCI_DEFAULT);
    OCIDefineByPos(stmthp, &defhp[1], errhp, 2, (ub1*)szname,
                   sizeof(szname), SQLT_STR, &ind[1], 0, 0, OCI_DEFAULT);
    OCIDefineByPos(stmthp, &defhp[2], errhp, 3, (ub1*)szphone,
                   sizeof(szphone), SQLT_STR, &ind[2], 0, 0, OCI_DEFAULT);

    // 执行SQL语句
    ret = OCIStmtExecute(svchp, stmthp, errhp, (ub4)0, 0, NULL, NULL, OCI_DEFAULT);
    if (ret != 0)
    {
        OCIErrorGet(errhp, 1, NULL, &ret, (OraText*)errbuf, sizeof(errbuf), OCI_HTYPE_ERROR);
        printf("\n%s\n", errbuf);
    }
    printf("\n%-10s%-10s%-10s\n", "PERSONID", "NAME", "PHONE");
    while ((OCIStmtFetch(stmthp, errhp, 1, OCI_FETCH_NEXT, OCI_DEFAULT)) != OCI_NO_DATA)
    {
        printf("%-10s", szpersonid);
        printf("%-10s", szname);
        printf("%-10s\n", szphone);
    }


    //结束会话
    OCISessionEnd(svchp, errhp, authp, (ub4)0);

    //断开与数据库的连接
    OCIServerDetach(srvhp, errhp, OCI_DEFAULT);

    //释放OCI句柄
    OCIHandleFree((dvoid*)dschp, OCI_HTYPE_DESCRIBE);
    OCIHandleFree((dvoid*)stmthp, OCI_HTYPE_STMT);
    OCIHandleFree((dvoid*)errhp, OCI_HTYPE_ERROR);
    OCIHandleFree((dvoid*)authp, OCI_HTYPE_SESSION);
    OCIHandleFree((dvoid*)svchp, OCI_HTYPE_SVCCTX);
    OCIHandleFree((dvoid*)srvhp, OCI_HTYPE_SERVER);
    system("pause");
    return 0;
}