C语言实现导入Oracle数据库(c 批了导入oracle)
C语言实现导入Oracle数据库
在数据处理中,数据的导入与导出是一个经常需要处理的问题,而在企业级应用程序中,Oracle数据库是一个被广泛使用的数据库。那么,在使用C语言处理数据时,如何实现导入Oracle数据库呢?本文将介绍C语言实现导入Oracle数据库的过程。
1. 安装Oracle客户端
在使用C语言导入Oracle数据库之前,需要在本地机器上安装Oracle客户端。具体操作如下:
(1)访问 Oracle 官网,下载 Oracle 客户端安装包。
(2)安装 Oracle 客户端。
(3)在环境变量中,添加 Oracle 客户端的路径。
2. 编写C语言程序
下面是一个C语言程序示例:
#include
#include
#include
#define MAX_STRING_SIZE 1024void checkerr(OCIError *errhp, sword status)
{ text errbuf[MAX_STRING_SIZE];
sb4 errcode = 0; OCIErrorGet((dvoid *)errhp, (ub4) 1, (text *) NULL, &errcode,
errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR); fprintf(stderr, "Error %d : %.*s\n", errcode, MAX_STRING_SIZE, errbuf);
exit((int)status);}
int mn(int argc, char **argv){
OCIEnv *envhp; OCIError *errhp;
OCISvcCtx *svchp; OCIServer *srvhp;
sword status; OCIDefine *defhp = (OCIDefine *) NULL;
OCIDate *datep; OCIDateTime *dtp;
OCIInterval *itvp; OCINumber *nump;
OCIRaw *rawp; OCIInterval *reftz = (OCIInterval *) NULL;
OCIInterval *dayprec = (OCIInterval *) NULL; OCIInterval *yrprec = (OCIInterval *) NULL;
OCILobLocator *clobp; OCILobLocator *blobp;
ub1 piece; ub2 rcode;
ub2 len; ub4 iter;
ub4 rowoff; sb2 ind;
int i; char *data;
oci8err_t e = 0; OCIInitialize((ub4) OCI_OBJECT, (dvoid *)0, NULL, (dvoid * (*)(dvoid *, size_t)) 0,
(dvoid * (*)(dvoid *, dvoid *, size_t))0, (void (*)(dvoid *, dvoid *)) 0 );
OCIEnvInit(&envhp, OCI_DEFAULT, (size_t) 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);
status = OCIAttrSet((dvoid *) srvhp, OCI_HTYPE_SERVER, (dvoid *) "ORCL", (ub4)strlen("ORCL"),
OCI_ATTR_SERVER_NAME, errhp); status = OCIServerAttach(srvhp, errhp, (text *) "", (sb4) strlen(""), 0);
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &svchp, OCI_HTYPE_SVCCTX, (size_t) 0, (dvoid **) 0);
status = OCIAttrSet((dvoid *) svchp, OCI_HTYPE_SVCCTX, (dvoid *) srvhp, (ub4) 0,
OCI_ATTR_SERVER, errhp);
status = OCIHandleAlloc((dvoid *) envhp, (dvoid **) &defhp, OCI_HTYPE_DEFINE, (size_t) 0, (dvoid **) 0);
status = OCIDefineByPos(defhp, &stmthp, errhp, (ub4) 1, (dvoid *) &data, (sb4) MAX_STRING_SIZE + 1, SQLT_STR,
(dvoid *) &ind, (ub2 *) 0, (ub2 *) 0, OCI_DEFAULT);
status = OCIHandleAlloc((dvoid *) envhp, (dvoid **)&stmthp, OCI_HTYPE_STMT, (size_t) 0, (dvoid **) 0);
status = OCIStmtPrepare(stmthp, errhp, (text *)"INSERT INTO TABLE_NAME (ID,NAME) VALUES (:1,:2)", (ub4)strlen("INSERT INTO TABLE_NAME (ID,NAME) VALUES (:1,:2)"), (ub4) OCI_NTV_SYNTAX, (ub4) OCI_DEFAULT);
for (i = 1; i {
if (strlen(argv[i]) > MAX_STRING_SIZE) {
fprintf(stderr, "Error : argv[%d] is too long.\n", i); return -1;
} status = OCIBindByName(stmthp, (OCIBind **)&bndhp, errhp, (text *)":1", (sb4) strlen(":1"),
(dvoid *)argv[i], (sb4)strlen(argv[i])+1, SQLT_STR, (dvoid *)&ind, (ub2 *)0, (ub2 *)0, (ub4)0, (ub4 *)0, OCI_DEFAULT);
status = OCIBindByName(stmthp, (OCIBind **)&bndhp, errhp, (text *)":2", (sb4) strlen(":2"), (dvoid *)argv[i+1], (sb4)strlen(argv[i+1])+1, SQLT_STR,
(dvoid *)&ind, (ub2 *)0, (ub2 *)0, (ub4)0, (ub4 *)0, OCI_DEFAULT); status = OCIStmtExecute(svchp, stmthp, errhp, (ub4) 1, (ub4) 0,
(CONST OCISnapshot **) NULL, (OCISnapshot **) NULL, OCI_DEFAULT); }
status = OCITransCommit(svchp, errhp, (ub4) 0); OCIHandleFree((dvoid *) stmthp, OCI_HTYPE_STMT);
OCIHandleFree((dvoid *) defhp, OCI_HTYPE_DEFINE); OCIHandleFree((dvoid *) svchp, OCI_HTYPE_SVCCTX);
OCILogoff(svchp, errhp); OCIHandleFree((dvoid *) srvhp, OCI_HTYPE_SERVER);
OCIHandleFree((dvoid *) errhp, OCI_HTYPE_ERROR); OCIHandleFree((dvoid *) envhp, OCI_HTYPE_ENV);
return 0;}
3. 编译程序
在终端中登录到 Oracle 用户,在 Oracle 产品路径下找到 `OCI/include` 和 `OCI/lib` 路径的位置,并将这些位置添加到 CFLAGS 和 LDFLAGS 环境变量中。
接下来,使用以下命令来编译程序:
gcc -o output_file_name.c -loci
就可以生成可执行文件了。在终端中输入可执行文件的名称,并按照提示输入需要导入 Oracle 数据库的数据即可。
通过以上三个步骤,您就可以使用 C 语言实现导入 Oracle 数据库。当然,在实际应用中,您还可以根据您的需求进行相关的改动,以满足真实场景的需要。