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 1024
void 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。


数据运维技术 » C语言实现导入Oracle数据库(c 批了导入oracle)