c 备份oracle数据库

备份是我们在数据库管理中非常常见和重要的一项操作。备份的目的是为了防范数据出现意外快照的情况，避免数据丢失对业务造成不可恢复的影响。本文将介绍如何通过C语言语言备份常用的Oracle数据库。

备份是一项庞大而复杂的系统，在C语言中要实现备份，我们要从数据库角度了解备份的原理。比如，常见的数据备份可以借助Oracle提供的数据泵，实现将Oracle数据库的内容导出到本地文件中，从而实现备份。下面将给大家介绍在C语言环境下实现Oracle数据库备份的方法。

在C语言中实现Oracle数据库备份的实现，其实是借助了Oracle中提供的数据泵的功能。C语言可以使用OCI（Oracle Call Interface）来调用Oracle数据库。我们通过C语言编写程序，从而实现对OCI的调用，然后通过调用OCI接口，实现Oracle数据库的备份。下面给大家介绍C语言备份Oracle数据库的代码实现：

#include#include#includeint main() { OCIEnv *envhp; //OCI环境句柄 OCIServer *srvhp; //OCI服务器句柄 OCISession *sesshp; //OCI会话句柄 OCIError *errhp; //OCI错误句柄 OCIDefine *defhp; //OCI结果集定义句柄 OCIStmt *stmthp; //OCI语句句柄 ub1 temp_s[MAX_STRING_SIZE]; //临时字符串 ub2 temp_i; //临时整数 sb2 temp_len; //临时长度 sword res; //OCI调用返回值 text *sql1 = (text *)"CREATE TABLE BackupSample AS SELECT * FROM Sample"; text *sql2 = (text *)"DROP TABLE BackupSample"; text *username = (text *)"scott"; text *password = (text *)"tiger"; text *database = (text *)"sample"; text *connect_str = (text *)"orcl"; // 初始化OCI环境 res = OCIEnvCreate(&envhp, OCI_THREADED, (dvoid *)0, (dvoid * (*)(dvoid *, size_t))0, (dvoid * (*)(dvoid *, dvoid *, size_t))0, (void(*) (void *, void *))0,0, (void *)0); // 初始化OCI错误句柄 OCIHandleAlloc((dvoid *)envhp, (dvoid **)&errhp, OCI_HTYPE_ERROR, (size_t)0, (dvoid **)0); // 初始化OCI连接策略句柄 OCIHandleAlloc((dvoid *)envhp, (dvoid **)&srvhp, OCI_HTYPE_SERVER, (size_t)0, (dvoid **)0); // 初始化OCISession会话句柄 OCIHandleAlloc((dvoid *)envhp, (dvoid **)&sesshp, OCI_HTYPE_SESSION, (size_t)0, (dvoid **)0); // 初始化OCI语句句柄 OCIHandleAlloc((dvoid *)envhp, (dvoid **)&stmthp, OCI_HTYPE_STMT, (size_t)0, (dvoid **)0); // 连接到数据库 OCIAttrSet((dvoid *)srvhp, OCI_HTYPE_SERVER, (dvoid *)connect_str, (ub4)strlen((char *)connect_str), OCI_ATTR_SERVER, errhp); res = OCIServerAttach(srvhp, errhp, (text *)database, strlen((char *)database), 0); OCIAttrSet((dvoid *)sesshp, OCI_HTYPE_SESSION, (dvoid *)username, (ub4)strlen((char *)username), OCI_ATTR_USERNAME, errhp); OCIAttrSet((dvoid *)sesshp, OCI_HTYPE_SESSION, (dvoid *)password, (ub4)strlen((char *)password), OCI_ATTR_PASSWORD, errhp); // 获取OCI会话句柄 res = OCISessionBegin(srvhp, errhp, sesshp, OCI_CRED_RDBMS, OCI_DEFAULT); // 设置当前连接会话 res = OCIAttrSet((dvoid *)stmthp, OCI_HTYPE_STMT, (dvoid *)sesshp, (ub4)0, OCI_ATTR_SESSION, errhp); // 执行SQL语句备份数据 res = OCIStmtPrepare(stmthp, errhp, sql1, strlen((char *)sql1), OCI_NTV_SYNTAX, OCI_DEFAULT); res = OCIStmtExecute(srvhp, stmthp, errhp, 1, 0, NULL, NULL, OCI_DEFAULT); // 执行SQL语句删除表 res = OCIStmtPrepare(stmthp, errhp, sql2, strlen((char *)sql2), OCI_NTV_SYNTAX, OCI_DEFAULT); res = OCIStmtExecute(srvhp, stmthp, errhp, 1, 0, NULL, NULL, OCI_DEFAULT); // 提交数据并释放句柄 res = OCISessionEnd(sesshp, errhp, NULL, 0); res = OCIServerDetach(srvhp, errhp, OCI_DEFAULT); OCIHandleFree((dvoid *)stmthp, OCI_HTYPE_STMT); OCIHandleFree((dvoid *)sesshp, OCI_HTYPE_SESSION); OCIHandleFree((dvoid *)srvhp, OCI_HTYPE_SERVER); OCIHandleFree((dvoid *)errhp, OCI_HTYPE_ERROR); OCIHandleFree((dvoid *)envhp, OCI_HTYPE_ENV); return 0; }