orastring.cpp

在动态库中实现异步导出大数据量的oracle数据

#include "stdafx.h"

#define __OCICPP_INTERNAL_USE_

#include "OraString.h"

/*!
  \class OCICPP::OraString
  \brief Client-side representation of string cells within the Oracle server
 */

OCICPP::OraString::OraString(OCIEnv *envhp,OCIError *errhp,OCIParam *paramd,ub2 type,int rows) : 
				OraType(envhp,errhp,paramd,type,rows),data(0)
{
	ub2 colSize;
	ReqType=SQLT_STR; /* Request a Null-terminating string for all types */
	CHECKERR(errhp,OCIAttrGet((dvoid *) paramd,OCI_DTYPE_PARAM,(dvoid *) &colSize,(ub4 *) 0,(ub4) OCI_ATTR_DATA_SIZE,errhp));
	size=(unsigned)(colSize?colSize:4000); /* For LONG */
	data=(char *)calloc((size+1)*nRows,sizeof(char));
	DEBUG(DLEV_DEBUG,"Size:%d nRows=%d\n",size,nRows);
}

OCICPP::OraString::~OraString() {
	free(data);
	OCIHandleFree(definehp,OCI_HTYPE_DEFINE);
}

void OCICPP::OraString::getStr(std::string &str,int row) {
	if(data) str.assign(data+(size+1)*row);
	else throw OraError("OCICPPLIB: Cannot getStr: Not fetched yet",OCICPPERROR);
}

void OCICPP::OraString::define(OCIStmt *stmt,int col) {
	CHECKERR(err, OCIDefineByPos(stmt, &definehp, err, col+1, data, size+1,ReqType,
	                                (dvoid *) null, 0, (ub2 *)0, OCI_DEFAULT));
}