c开发更新Oracle数据库语句

在C语言中，我们通常使用Oracle Call Interface (OCI)来更新Oracle数据库，OCI是Oracle提供的一套用于访问和操作Oracle数据库的API，它允许我们在C程序中执行SQL语句，从而实现对数据库的增删改查等操作。

以下是一个简单的示例，展示了如何在C语言中使用OCI更新Oracle数据库：

1、我们需要包含必要的头文件，并定义一些全局变量和错误处理函数：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <oci.h>
static void checkerr(OCIError *errhp, sword status) {
    sb4 errcode = 0;
    text errbuf[512];
    switch (status) {
        case OCI_SUCCESS:
            break;
        case OCI_SUCCESS_WITH_INFO:
            printf("Success with info
");
            break;
        case OCI_NEED_DATA:
            printf("Need data
");
            break;
        case OCI_NO_DATA:
            printf("No data
");
            break;
        case OCI_ERROR:
            OCIErrorGet((dvoid *)errhp, (ub4)1, (text *)NULL, &errcode, errbuf, (ub4)sizeof(errbuf), OCI_HTYPE_ERROR);
            printf("Error %ld: %s
", errcode, errbuf);
            break;
        case OCI_INVALID_HANDLE:
            printf("Invalid handle
");
            break;
        case OCI_STILL_EXECUTING:
            printf("Still executing
");
            break;
        case OCI_CONTINUE:
            printf("Continue
");
            break;
        default:
            printf("Unknown error
");
            break;
    }
}

2、接下来，我们需要初始化OCI环境，并连接到Oracle数据库：

int main() {
    OCIEnv *envhp;
    OCIServer *srvhp;
    OCIError *errhp;
    OCISvcCtx *svchp;
    OCISession *usrhp;
    OCIBind *bindhp;
    OCIDefine *defnp;
    const text *sql;
    sb4 rc;
    ub4 iterspc, indtyp, mode;
    sword status;
    text errbuf[512];
    text bindname[512], bindvalue[512];
    ub4 namelen, valuelen;
    ub2 rcode;
    ub4 rowcount = 0;
    dvoid *rowid = NULL;
    OCIRowid *rowidhp;
    sword dyn = OCI_DYNAMIC;
    sword is_begin = 0; // 0 for not begin, 1 for begin, 1 for endoffile or error during fetching rows from query result set.
    sword is_commit = 0; // 0 for not commit, 1 for commit.
    sword is_rollback = 0; // 0 for not rollback, 1 for rollback.
    sword is_fetch = 0; // 0 for not fetch, 1 for fetch.
    sword is_close = 0; // 0 for not close, 1 for close.
    sword is_exit = 0; // 0 for not exit, 1 for exit.
    sword is_free = 0; // 0 for not free, 1 for free.
    sword is_error = 0; // 0 for no error, 1 for error.
    sword is_success = 0; // 0 for no success, 1 for success.
    sword is_update = 0; // 0 for no update, 1 for update.
    sword is_insert = 0; // 0 for no insert, 1 for insert.
    sword is_delete = 0; // 0 for no delete, 1 for delete.
    sword is_select = 0; // 0 for no select, 1 for select.
    sword is_exec = 0; // 0 for no execute, 1 for execute.
    sword is_open = 0; // 0 for no open, 1 for open.
    sword is_prepare = 0; // 0 for no prepare, 1 for prepare.
    sword is_commited = 0; // 0 for no commited, 1 for commited.
    sword is_rollbacked = 0; // 0 for no rollbacked, 1 for rollbacked.
    sword is_closed = 0; // 0 for no closed, 1 for closed.
    sword is_freed = 0; // 0 for not freed, 1 for freed.

3、我们需要创建一个新的事务，并准备要执行的SQL语句：

// ...省略部分代码...
is_begin = 1; // begin transaction if needed.
is_commit = 0; // do not commit transaction if needed.
is_rollback = 0; // do not rollback transaction if needed.
is_fetch = 0; // do not fetch rows from query result set if needed.
is_close = 0; // do not close statement if needed.
is_exit = 0; // do not exit program if needed.
is_free = 0; // do not free resources if needed.
is_error = 0; // no error occurred if needed.
is_success = 0; // no success occurred if needed.
is_update = 1; // update the database if needed.
is_insert = 0; // do not insert data into the database if needed.
is_delete = 0; // do not delete data from the database if needed.
is_select = 0; // do not select data from the database if needed.
is_exec = 1; // execute SQL statement if needed.