resultset.cpp

tocci是用C编写的建立在OCI基础之上的对ORACLE的接口进行调用,和OCCI操作类似,简化了OCI复杂的调用.在LINUX下使用.

/*

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contributors may be used to endorse or promote products derived from 
this software without specific prior written permission. 

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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
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*/
#include "tocci/tocci.h"
using namespace oracle::occi;

#define OASSERT(x) if ((x)!=OCI_SUCCESS && (x)!=OCI_SUCCESS_WITH_INFO) throw(*new SQLException(errhp));

ResultSet::ResultSet():stmt(NULL),errhp(NULL) {}
ResultSet::ResultSet(OCIStmt *st, OCIError *err):
	stmt(st),
	errhp(err) {

	OCIParam *par;
	int numcols, r, i;
	text *aname;
	ub4 alen;

	r=OCIAttrGet(stmt, OCI_HTYPE_STMT, &numcols, 0, OCI_ATTR_PARAM_COUNT, errhp);
	OASSERT(r);
	/* WE NEED TO DefineByPos or something here to recieve data */
	for (i=1; i<=numcols; i++) {
			r=OCIParamGet(stmt, OCI_HTYPE_STMT, errhp, (void **)&par, i);
			alen=0;
			r=OCIAttrGet((dvoid*) par, (ub4) OCI_DTYPE_PARAM, 
					 (dvoid*) &aname, &alen, (ub4) OCI_ATTR_NAME, 
					(OCIError *) errhp );
			OASSERT(r);
			metadata.push_back(MetaData(string((char*)aname, alen)));
			OCIDescriptorFree((void*) par, OCI_DTYPE_PARAM);
	}
}

int ResultSet::next() { 
	if (stmt==NULL) return END_OF_FETCH;
	int r, numcols, datalen;
	OCIParam *par;
	OCIDefine *def;
	int i, errcode;
	short dtype;
	
	char *dptr;

	r=OCIAttrGet(stmt, OCI_HTYPE_STMT, &numcols, 0, OCI_ATTR_PARAM_COUNT, errhp);
	OASSERT(r);
	/* WE NEED TO DefineByPos or something here to recieve data */
	for (i=1; i<=numcols; i++) {
		par=NULL;
		r=OCIParamGet(stmt, OCI_HTYPE_STMT, errhp, (void **)&par, i);
		OASSERT(r);
		datalen=0;
		r=OCIAttrGet((dvoid*) par, (ub4) OCI_DTYPE_PARAM, 
                 (dvoid*) &dtype,(ub4 *) 0, (ub4) OCI_ATTR_DATA_TYPE, 
                (OCIError *) errhp );
		OASSERT(r);
		r=OCIAttrGet((dvoid*) par, (ub4) OCI_DTYPE_PARAM, (void*) &datalen, NULL, (ub4) OCI_ATTR_DATA_SIZE, 
        (OCIError *) errhp  );
		OASSERT(r);

		if (dtype!=SQLT_STR) {
			dtype=SQLT_STR;
			datalen=512;
		}
		

		if (data[i]==NULL) {data[i]=new Cell; data[i]->ptr=NULL; }
		dptr=(char *)(data[i]->ptr=realloc(data[i]->ptr, datalen+1));
		memset(data[i]->ptr, 0, datalen+1);
		data[i]->len=datalen;
		data[i]->type=dtype;
		if (data[i]->ptr==NULL) throw(*new SQLException(6, "Not enough memory"));
		def=NULL;
		r=OCIDefineByPos(stmt, &def, errhp, i, data[i]->ptr, datalen, dtype, NULL, NULL, NULL, OCI_DEFAULT);
		OASSERT(r);

		OCIDescriptorFree((void*) par, OCI_DTYPE_PARAM);
	}

	r=OCIStmtFetch(stmt, errhp, 1, OCI_FETCH_NEXT, OCI_DEFAULT);
	if (r==OCI_ERROR) {
		OCIErrorGet(errhp, 1, (text *) NULL, &errcode,
                       (ub1*)NULL, -1,  OCI_HTYPE_ERROR);
		if (errcode==1405) r=OCI_SUCCESS;
	}
	if (r==OCI_NO_DATA) return END_OF_FETCH;
	OASSERT(r);
	return DATA_AVAILABLE;
}

unsigned int ResultSet::getUInt(int pos) {
	unsigned int res=(unsigned int)getInt(pos); //i know i know ;)
	return res;
}

int ResultSet::getInt(int pos) {
	if (data[pos]==NULL) throw(*new SQLException(7, "no such column"));
	
	int len=data[pos]->len;
	int type=data[pos]->type;
	char *ptr=(char *)data[pos]->ptr;
	int res=0, r;

	switch(type) {
	case SQLT_STR:
		res=atoi(ptr);
		return res;

	case SQLT_NUM: 
		r = OCINumberToInt (errhp, (struct OCINumber*)ptr, sizeof(res), OCI_NUMBER_SIGNED, &res);
		OASSERT(r);
		return res;
		break;

	default: throw(*new SQLException(1, "Cannot cast sql type to int(unknown type.)"));
	}
	return 0;
}

const string ResultSet::getString(int pos){
	if (data[pos]==NULL) throw(*new SQLException(7, "no such column"));
	char *dptr=(char*)data[pos]->ptr;
	int e=strlen(dptr)-1;
	while(dptr[e]==' ') e--; //trim
	dptr[e+1]=0;
	return dptr;
}

const vector<MetaData>& ResultSet::getColumnListMetaData() const {
	return metadata;
}

ResultSet::~ResultSet() {
	for (map<int, Cell*>::iterator i=data.begin(); i!=data.end(); i++) {
		delete (*i).second;
	}
}