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在C語(yǔ)言中，發(fā)更我們通常使用Oracle Call Interface (OCI)來(lái)更新Or??acle數據庫，據庫OCI是語(yǔ)句Oracle提??供的一套用于訪(fǎng)問(wèn)和操作Oracle數據庫的API，它允許我們在C程序中執行SQL語(yǔ)句，發(fā)更從而實(shí)現對數據庫的據庫增刪改查等操作。
（圖片來(lái)源網(wǎng)絡(luò )，語(yǔ)句侵刪）以下是發(fā)更一個(gè)簡(jiǎn)單的示例，展示了如何在C語(yǔ)言中使用OCI更新Oracle數據(???)庫：
1、據庫我??們需要包含必要的語(yǔ)句頭文件，并定義一些全局變量和錯誤處理函數：
#include <stdio.h>#include <stdlib.h>#include <string.h>#include <oci.h>static void checkerr(OCIError *errhp,發(fā)更 sword status) { sb4 errcode = 0; text errbuf[512]??; switch (statu??s(???)) { case OCI_SUCCESS: break; case OCI_SUCCESS_WITH_INFO: printf("Success with info"); brea??k; 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, err(′?_?`)buf, (ub4)sizeof(errbuf), OCI_HTYPE_ERROR); printf(′?_?`)(??"Error %ld: %s", errcode, errbuf); break; case OCI_INVALID_HANDLE: printf("Invalid handle&(′▽?zhuān)?)quot;); break; case OCI_STILL_EXECUTING: printf("Still executing"); break; case OCI_CONTINヽ(′▽?zhuān)?ノUE: printf("Continue"); break; defau??lt: prin??tf("Unknown error"); break; }}2、接下來(lái)，據庫我們需要初始化OCI環(huán)境，語(yǔ)句并連接到Oracle數據庫：
int main() { OCIEnv *envhp; OCIServer *srvhp; OCIError *errhp; OCISvcCtx *svchp; OCISession *usrhp; OCIBin??d *bindhp; OCIDefine *defnp; const text *sql; sb4 rc; ub4 iterspc,發(fā)更 indtyp, mode; sword status; text errbuf[512]; text bindname[51(′?｀)2], bindva???lue[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( ?ヮ?) begin, 1 for endoffile or errorヾ(′▽?zhuān)?? 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 fo??r rollback. sword is_fetch = 0; // 0 for not fetch, 1 for fetch. sword is_close = 0; // 0 for not clo(′?_?`)se, 1 for close. sword is_exi(╯‵□′)╯t = 0; //(′_｀) 0 for not exi??t, 1 for exit. sword is_fre(′▽?zhuān)?e = 0; // 0 for not free, 1 for free. sword is_error = 0; // 0 for(°o°) no error, 1 for error. sw??ord is_success = 0; // 0 for no success, 1 for success. sword is_update = 0; // 0 for no up??date, 1 for update. sword is_in(???)sert = 0; // 0 for no insert, 1 for insert. sw??ord 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='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 fo??r roll??back(′?ω?`)ed. sword?? is_closed = 0; // 0 for no closed, 1 for closed. sw??ord is_??freed = 0; // 0 for not freed, 1 for freed.// ...省略部分代碼...is_begin = 1; // begin transaction if needed.is_commit = 0; // do not commit transaction if needed.is_rollback = 0; // do not rollback transactio??n 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 neeヽ(′ー｀)ノded.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 datab(′-ι_-｀)ase if( ?ヮ?) needed.is_select = 0; // do not?? select data from the datab??ase if needed.is_exec = 1; // execut??e SQL statement if needed.
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