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c開發(fā)更新Oracle數(shù)據(jù)庫語句
在C語言中，我們通常使用Oracle Call Interface (OCI)來更新Oracle數(shù)據(jù)庫，OCI是Oracle提供的一套用于訪問和操作Oracle數(shù)據(jù)庫的API，它允許我們在C程序中執(zhí)行SQL語句，從而實現(xiàn)對數(shù)據(jù)庫的增刪改查等操作。
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以下是一個簡單的示例，展示了如何在C語言中使用OCI更新Oracle數(shù)據(jù)庫：
1、我們需要包含必要的頭文件，并定義一些全局變量和錯誤處理函數(shù)：
#include#include #include #include 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、接下來，我們需要初始化OCI環(huán)境，并連接到Oracle數(shù)據(jù)庫：
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、我們需要創(chuàng)建一個新的事務，并準備要執(zhí)行的SQL語句：
// ...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 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.
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