C Oracle記錄是一種非常重要的技術(shù)，在許多企業(yè)級(jí)應(yīng)用程序中被廣泛使用。C語(yǔ)言是一種非常流行的高級(jí)編程語(yǔ)言，在許多操作系統(tǒng)和數(shù)據(jù)庫(kù)管理系統(tǒng)中都得到了廣泛的應(yīng)用。Oracle是一種關(guān)系型數(shù)據(jù)庫(kù)管理系統(tǒng)，在許多企業(yè)中用于存儲(chǔ)和管理大量的數(shù)據(jù)。因此，使用C Oracle記錄技術(shù)可以幫助企業(yè)更好地管理和分析數(shù)據(jù)。

C Oracle記錄技術(shù)主要涉及以下幾個(gè)方面：

1. 連接Oracle數(shù)據(jù)庫(kù)

#include#include#includeint main()
{
OCIEnv *envhp;
OCIError *errhp;
OCIServer *srvhp;
OCIUserSession *usrhp;
OCISession *seshp;
text *username = "scott";
text *password = "tiger";
text *dsn = "ORCL";
OCIInitialize(OCI_DEFAULT);
OCIHandleAlloc((dvoid *)OCIEnv, (dvoid **)&envhp, OCI_HTYPE_ENV, 0, NULL);
OCIHandleAlloc(envhp, (dvoid **)&errhp, OCI_HTYPE_ERROR, 0, NULL);
OCIHandleAlloc(envhp, (dvoid **)&srvhp, OCI_HTYPE_SERVER, 0, NULL);
OCIHandleAlloc(envhp, (dvoid **)&usrhp, OCI_HTYPE_USER, 0, NULL);
OCIHandleAlloc(envhp, (dvoid **)&seshp, OCI_HTYPE_SESSION, 0, NULL);
OCIServerAttach(srvhp, errhp, (text *)dsn, strlen(dsn),OCI_DEFAULT);
OCIAttrSet(usrhp, OCI_HTYPE_USER, username, strlen(username),OCI_ATTR_USERNAME, errhp);
OCIAttrSet(usrhp, OCI_HTYPE_USER, password, strlen(password),OCI_ATTR_PASSWORD, errhp);
OCIAttrSet(seshp, OCI_HTYPE_SESSION, usrhp, sizeof(OCIUserSession),OCI_ATTR_SESSION, errhp);
OCISessionBegin(srvhp, errhp, seshp, OCI_CRED_RDBMS, OCI_DEFAULT);
OCIHandleFree(srvhp, OCI_HTYPE_SERVER);
OCIHandleFree(usrhp, OCI_HTYPE_USER);
/*剩下的代碼將被“記一條”和“讀取”函數(shù)覆蓋*/
...
}

2. 記錄數(shù)據(jù)

在Oracle中，記錄（行）通常表示表中的一個(gè)條目。C Oracle記錄技術(shù)可以幫助我們使用C語(yǔ)言直接向Oracle數(shù)據(jù)庫(kù)中的表添加新的條目。

#define ROW_COUNT 10
int insert_rows(OCIEnv *envhp, OCIError *errhp, OCISvcCtx *svchp)
{
OCIStmt *stmthp;
int i;
OCIHandleAlloc((dvoid *)envhp, (dvoid **)&stmthp, OCI_HTYPE_STMT, 0, NULL);
OCIStmtPrepare(stmthp, errhp, "INSERT INTO example_table VALUES (:1,:2)", strlen("INSERT INTO example_table VALUES (:1,:2)"), OCI_NTV_SYNTAX, OCI_DEFAULT);
OCIStmtExecute(svchp, stmthp, errhp, ROW_COUNT, 0, NULL, NULL, OCI_COMMIT_ON_SUCCESS);
for (i = 0; i< ROW_COUNT; i++)
{
OCIBind *bndp;
int id = i + 1;
OCIHandleAlloc(envhp, (dvoid **)&bndp, OCI_HTYPE_BIND, 0, NULL);
OCIBindByPos(stmthp, &bndp, errhp, 1, &id, sizeof(id), SQLT_INT, NULL, NULL, NULL, 0, NULL, OCI_DEFAULT);
OCIBindByPos(stmthp, &bndp, errhp, 2, "example data", strlen("example data"), SQLT_STR, NULL, NULL, NULL, 0, NULL, OCI_DEFAULT);
OCIStmtExecute(svchp, stmthp, errhp, 1, 0, NULL, NULL, OCI_COMMIT_ON_SUCCESS);
OCIBindFree(bndp);
}
OCIHandleFree(stmthp, OCI_HTYPE_STMT);
return ROW_COUNT;
}

3. 讀取數(shù)據(jù)

使用C Oracle記錄技術(shù)，我們可以從Oracle數(shù)據(jù)庫(kù)表中讀取數(shù)據(jù)，并將結(jié)果存儲(chǔ)為C結(jié)構(gòu)體對(duì)象。這樣，我們就可以在編寫(xiě)C程序時(shí)輕松地讀取Oracle數(shù)據(jù)庫(kù)中的數(shù)據(jù)。

#includestruct example
{
int id;
char data[20];
};
int fetch_rows(OCIEnv *envhp, OCIError *errhp, OCISvcCtx *svchp, struct example *data)
{
OCIStmt *stmthp;
int rows_fetched = 0;
OCIHandleAlloc(envhp, (dvoid **)&stmthp, OCI_HTYPE_STMT, 0, NULL);
OCIStmtPrepare(stmthp, errhp, "SELECT * FROM example_table", strlen("SELECT * FROM example_table"), OCI_NTV_SYNTAX, OCI_DEFAULT);
OCIStmtExecute(svchp, stmthp, errhp, 0, 0, NULL, NULL, OCI_COMMIT_ON_SUCCESS);
OCIDefine *defhp;
OCIHandleAlloc(envhp, (dvoid **)&defhp, OCI_HTYPE_DEFINE, 0, NULL);
OCIDefineByPos(stmthp, &defhp, errhp, 1, &data->id, sizeof(data->id), SQLT_INT, NULL, NULL, NULL, OCI_DEFAULT);
OCIDefineByPos(stmthp, &defhp, errhp, 2, data->data, sizeof(data->data), SQLT_STR, NULL, NULL, NULL, OCI_DEFAULT);
while (OCIStmtFetch(stmthp, errhp, 1, OCI_FETCH_NEXT, OCI_DEFAULT) == OCI_SUCCESS)
{
rows_fetched++;
data++;
}
OCIHandleFree(stmthp, OCI_HTYPE_STMT);
OCIHandleFree(defhp, OCI_HTYPE_DEFINE);
return rows_fetched;
}

正如您所看到的，使用C Oracle記錄技術(shù)可以幫助我們?cè)贑程序中輕松地連接到Oracle數(shù)據(jù)庫(kù)，并添加、讀取或編輯其中的數(shù)據(jù)。這種技術(shù)在許多企業(yè)級(jí)應(yīng)用程序中得到了廣泛的應(yīng)用，對(duì)于管理和分析大量的數(shù)據(jù)非常有用。