testcursor2.cpp~

这是我用QT和TTS写的一个电话本管理系统

//get data
#include <db_cxx.h> 
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
/* DB的函数执行完成后，返回0代表成功，否则失败 */
void print_error(int ret)
{
	if(ret != 0)
		printf("ERROR: %s\n",db_strerror(ret));
}
/* 数据结构DBT在使用前，应首先初始化，否则编译可通过但运行时报参数错误  */
void init_DBT(DBT * key, DBT * data)
{
	memset(key, 0, sizeof(DBT));
	memset(data, 0, sizeof(DBT));
}
int main(void)
{
	DB *dbp;    
	DBC * cur;
	DBT key, data;
	u_int32_t flags;  
	int ret;
	typedef struct customer
	{
		//int  c_id;
		char name[10];
		char address[20];
		int  age;
	} CUSTOMER;
	CUSTOMER cust; 

	ret = db_create(&dbp, NULL, 0);
	print_error(ret);
	flags = DB_CREATE;    
	/* 创建一个名为complex.db的数据库，使用HASH访问算法，本段代码演示对复杂数据结构的处理 */
	ret = dbp->open(dbp, NULL, "complex.db", NULL, DB_BTREE, flags, 0); 
	print_error(ret);
	dbp->cursor(dbp, NULL, &cur, 0);	
	init_DBT(&key, &data);	
	while((ret = cur->c_get(cur, &key, &data, DB_NEXT)) == 0)	
	{
		//	printf("name = %s address = %s age = %d\n",data.name, data.address, data.age);
		printf("db: %s: key retrieved: data was %s.\n",(char *)key.data, (char *)data.data);
		//data.data = &cust;
		//data.ulen = sizeof(CUSTOMER); 
		//printf("cust.name=% cust.address=% cust.age=%s\n\n",cust.name,cust.address,cust.age);
		printf("key = %s\n",*((float*)key.data));
		printf("data = %s\n",(char *)data.data);
		
	}

	//if(dbp != NULL)
			cur->c_close(cur);
    		dbp->close(dbp, 0); 
    	return 0;
}