putstruct.c

这是我用QT和TTS写的一个电话本管理系统

//put data
#include <db.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;           
	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; 
	
	//cust.c_id = 1;
	strncpy(cust.name, "china", 9);
	strncpy(cust.address, "chengdu", 19);
	cust.age = 32;

	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);
	
	init_DBT(&key, &data);
	
	//key.size = sizeof(int);
	key.size = 10;
	key.data = &cust.name;
	data.size = sizeof(CUSTOMER);
	data.data = &cust;
	
	ret = dbp->put(dbp, NULL, &key, &data,DB_NOOVERWRITE);
	print_error(ret);
	memset(&cust,0,sizeof(CUSTOMER));
	
	char tempname[10];
	strncpy(tempname, "china", 9);	
	key.data = &tempname;
	key.size =10;
	
	printf("key.data = %s\n",key.data);
	printf("tempname=%s\n",tempname);
	data.data = &cust;
	data.ulen = sizeof(CUSTOMER); 
	data.flags = DB_DBT_USERMEM;
	dbp->get(dbp, NULL, &key, &data, 0);
	print_error(ret);	
	printf("name = %s address = %s age = %d\n", 
		cust.name, cust.address, cust.age);
		
	
	if(dbp != NULL)
	{
    		dbp->close(dbp, 0);
    	}
   	return 0;
}