c Oracle blob

C和Oracle Blob的结合可以说是非常重要的，因为在现代数据库中，Blob是一种非常常见的类型，常用于存储二进制数据，如图片、音频书籍等。在C语言中，我们可以使用OCI API来操作Oracle Blob。下面我将详细阐述在C语言中如何使用OCI API来读取和写入Oracle Blob。

OCI API实际上是一个C语言库，可以用于与Oracle数据库的交互。OCI API具有很强的灵活性和效率，可以直接获取SQL之外的元数据和执行SQL命令。具体来说，OCI API对于Oracle Blob的操作流程如下：

// 连接到Oracle数据库 OCIEnvCreate(&envhp, OCI_THREADED|OCI_OBJECT, (dvoid *)0, (dvoid * (*)(dvoid *, size_t)) 0, (dvoid * (*)(dvoid *, dvoid *, size_t))0, (void (*)(dvoid *, dvoid *)) 0, 0, (dvoid **)0 ); OCIHandleAlloc((dvoid *)envhp, (dvoid **)&errhp, OCI_HTYPE_ERROR, (size_t) 0, (dvoid **) 0); OCIHandleAlloc((dvoid *)envhp, (dvoid **)&srvhp, OCI_HTYPE_SERVER, (size_t) 0, (dvoid **) 0); OCIHandleAlloc((dvoid *)envhp, (dvoid **)&svc, OCI_HTYPE_SVCCTX, (size_t) 0, (dvoid **) 0); OCILogon2(envhp, errhp, &svc, (text *)username, (ub4)strlen(username), (text *)password, (ub4)strlen(password), (text *)database, (ub4)strlen(database), OCI_DEFAULT); // 打开LOB and BLOB 插入 OCIHandleAlloc((dvoid *) s, (dvoid **)&stmthp, OCI_HTYPE_STMT, 0, (dvoid **)0); OCIStmtExecute(svc, stmthp, errhp, (ub4)1, (ub4)0, (CONST OCISnapshot *)NULL, (OCISnapshot *)NULL, OCI_DEFAULT);