嵌入式linux-sqlite3数据库，代码示例

其他 2018-12-14 18:46:32 阅读次数: 0 
#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h>
#include <string.h>
#include <time.h>
#include <strings.h>


#define DATABASE "fru.db"
typedef struct{
	char time[20];
	char name[16];
	float cost;//成本
	float price;//售价
	char in_out[5];//进货in,出货out
	float number;//交易量
	float money;//交易金额（成本或售价*交易量）
	float total;//库存总量
}fruit_t;

void operate_table_cmd_menu()
{
	puts("/******************************************/");
	puts("*operate table cmd menu:");
	printf("*1:insert 2:delete 3:query 4:update 5:quite \n");
	puts("/******************************************/");
	printf("Please input cmd:");
}

const char *get_local_time(char *time_str);
fruit_t *get_last_row(sqlite3 *db,fruit_t *fruit);
int query_callback(void *para, int f_num, char **f_value, char **f_name);
int do_insert_sqlite3(sqlite3 * db);
int do_delete_sqlite3(sqlite3 * db);
int do_query_sqlite3(sqlite3 * db);
void get_columns_name(sqlite3 * db);//获取字段名称
int do_update_sqlite3(sqlite3 * db);

int main(int argc, const char *argv[])
{
	sqlite3 * db;
	char *errmsg;
	int cmd;
	char sql[128]={};

	//打开sqlite3数据库
	if(sqlite3_open(DATABASE,&db) != SQLITE_OK)
	{
		printf("%s\n",sqlite3_errmsg(db));
		exit(-1);
	}
	else
	{
		printf("open %s success.\n",DATABASE);
	}

	//创建一张数据库的表格   将ID设为主键值，并设为自增字段(保证字段唯一性)
	sprintf(sql,"create table fru(time char,name char,cost Integer,price Integer,in_out char,number Integer,money Integer,total Integer);");
	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		printf("%s\n",errmsg);
	}
	else
	{
		printf("create or open table success.\n");
	}

	while(1)
	{
		operate_table_cmd_menu();
		while(scanf("%d",&cmd) == 0)
		{
			getchar();
			operate_table_cmd_menu();
		}
		getchar();

		switch(cmd)
		{
			case 1:
				do_insert_sqlite3(db);
				break;
			case 2:
				do_delete_sqlite3(db);
				break;
			case 3:
				do_query_sqlite3(db);
				break;
			case 4:
				do_update_sqlite3(db);
				break;
			case 5:
				sqlite3_close(db);
				exit(0);
			default:
				printf("Error cmd.\n");
		}
	
	}
	return 0;
}

const char *get_local_time(char *time_str)
{
	time_t tim_t;
	struct tm loc_t;

	time(&tim_t);

	loc_t = *localtime(&tim_t);

	sprintf(time_str,"%04d-%d-%02d %02d:%02d:%02d",loc_t.tm_year+1900,loc_t.tm_mon+1,loc_t.tm_mday,loc_t.tm_hour,loc_t.tm_min,loc_t.tm_sec);

	return time_str;
}

fruit_t *get_last_row(sqlite3 *db,fruit_t *fruit)
{
	char **resultp;
	int nrow;
	int ncolumn;
	char sql[128];
	int index_base;
	char *errmsg;

	sprintf(sql,"select * from fru where name='%s';",fruit->name);

	sqlite3_get_table(db,sql,&resultp,&nrow,&ncolumn,&errmsg);
	
	if(nrow == 0)
	{
		return NULL;
	}
	else
	{
		index_base = (nrow)*(ncolumn);
		fruit->cost = atof(resultp[index_base+2]);
		fruit->price = atof(resultp[index_base+3]);
		fruit->total = atof(resultp[index_base+7]);
	}
	return fruit;
}
int do_insert_sqlite3(sqlite3 * db)
{
	fruit_t fruit;
	char sql[128];
	char *errmsg;
	char type[10];

	bzero(&fruit,sizeof(fruit));

	get_local_time(fruit.time);

	printf("input fruit name:");
	scanf("%s",fruit.name);
	getchar();


	if(get_last_row(db,&fruit) != NULL)//系统中已经有这种水果的记录
	{
		puts("*************************************");	
		printf("%s cost:%.2f price:%.2f\n",fruit.name,fruit.cost,fruit.price);
		puts("*************************************");	
		printf("if you change it[y|n]:");

		scanf("%s",type);
		getchar();

		if(strncasecmp(type,"y",strlen("y")) == 0)
		{
		char value[20];
			printf("change cost:%.2f of %s [cost|n]:",fruit.cost,fruit.name);
			scanf("%s",value);//输入成本修改成本，输入n放弃修改
			getchar();
			if(strncasecmp(value,"n",strlen("n")) != 0)
				fruit.cost = atof(value);
		
			printf("change price:%.2f of %s [price|n]:",fruit.price,fruit.name);
			scanf("%s",value);//输入单价修单价，输入n放弃修改
			getchar();
			if(strncasecmp(value,"n",strlen("n")) != 0)
				fruit.price = atof(value);
		}
		printf("Please input the number of %s:",fruit.name);
		scanf("%f",&fruit.number);
		getchar();

		fruit.total = fruit.total +fruit.number;
	}
	else//系统中没有的水果种类
	{
		printf("Please input the cost of %s [cost]:",fruit.name);
		while(scanf("%f",&fruit.cost) == 0)
		{
			getchar();
			printf("Please input the cost of %s [cost]:",fruit.name);
		}
		getchar();
	
		printf("Please input the price of %s [price]:",fruit.name);
		while(scanf("%f",&fruit.price) == 0)
		{
			getchar();
			printf("Please input the price of %s [price]:",fruit.name);
		}
		getchar();
			
		printf("Please input the number of %s:",fruit.name);
		scanf("%f",&fruit.number);
		getchar();

		fruit.total = fruit.number;
	}
	
	sprintf(fruit.in_out,"in");

	fruit.money = fruit.cost * fruit.number;


	sprintf(sql,"insert into fru values('%s','%s',%.4f,%.4f,'%s',%.4f,%.4f,%.4f);",fruit.time,fruit.name,fruit.cost,fruit.price,fruit.in_out,fruit.number,fruit.money,fruit.total);//自增字段的值传NULL

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK )
	{
		printf("%s\n",errmsg);
		return -1;
	}
	else
	{
		printf("insert:\n ");

		sprintf(sql,"select * from fru where time='%s';",fruit.time);
		get_columns_name(db);//获取字段名称
		sqlite3_exec(db,sql,query_callback,NULL,&errmsg);
		printf("done\n");

		return 0;
	}
}
int query_callback(void *para, int f_num, char **f_value, char **f_name)
{

	int i;
	for(i=0;i<f_num;i++)
	{
		if(i == 0)
			printf("\t%-19s ",f_value[i]);
		else
			printf("%-10s ",f_value[i]);
	}
	puts("");
	return 0;
}
void get_columns_name(sqlite3 * db)
{
	char **resultp;
	int nrow;
	int ncolumn;
	char *errmsg;
	int i;

	sqlite3_get_table(db,"select * from fru",&resultp,&nrow,&ncolumn,&errmsg);
	printf("\t%-19s ",resultp[0]);
	for(i=1;i<ncolumn;i++)
	{
		printf("%-10s ",resultp[i]);
	}
	puts("");
}
int do_delete_sqlite3(sqlite3 * db)
{
	fruit_t fruit;
	char sql[128];
	char *errmsg;
	char value[20];

	bzero(&fruit,sizeof(fruit));

	get_local_time(fruit.time);

	printf("input fruit name:");
	scanf("%s",fruit.name);
	getchar();


	if(get_last_row(db,&fruit) != NULL)//系统中有这种水果
	{
		printf("input the out number of %s:",fruit.name);

		scanf("%s",value);
		getchar();

		if(atof(value) > fruit.total)//剩余的数量不够
		{
			printf("The total number:%.4f of %s is not enough, please stock it.\n",fruit.total,fruit.name);
			return -1;
		}
		else
		{
			fruit.number = atof(value);
			fruit.money = fruit.price * fruit.number;
			fruit.total = fruit.total - fruit.number;
		}
	}
	else//系统中没有这种水果
	{
		printf("We don't have this fruit:%s. Please stock it.",fruit.name);
		return -1;
	}
	
	sprintf(fruit.in_out,"out");

	printf("are you sure delete number:%.4f of %s[y|n]:",fruit.number,fruit.name);
	scanf("%s",value);
	getchar();

	if(strncasecmp(value,"y",strlen("y")) == 0)
	{
		sprintf(sql,"insert into fru values('%s','%s',%.4f,%.4f,'%s',%.4f,%.4f,%.4f);",fruit.time,fruit.name,fruit.cost,fruit.price,fruit.in_out,fruit.number,fruit.money,fruit.total);//自增字段的值传NULL

		if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK )
		{
			printf("%s\n",errmsg);
			return -1;
		}
		else
		{
			printf("delete done\n ");
			return 0;
		}
	}
	else
	{
		printf("delete cancelled.\n");
		return 0;
	}
}
int do_query_sqlite3(sqlite3 * db)
{
	fruit_t fruit;
	char sql[128];
	char *errmsg;
	char value[96];

	bzero(&fruit,sizeof(fruit));

	puts("*************************************");	
	printf("*Examples of query types:\n");
	puts("*[all | name='apple' | in_out='in']");
	//puts("*[all total | apple total | banana total]");
	puts("*[time<'2018-12-5 17:08:08' | total>90 and total<200]");
	puts("*[name='apple' and in_out='in']");
	puts("*************************************");	

	printf("Pease input query type:");
	scanf("%s",value);
	getchar();

	if(strncasecmp("all",value,strlen(value)) == 0)
		sprintf(sql,"select * from fru;");
	else
		sprintf(sql,"select * from fru where %s;",value);//自增字段的值传NULL

	get_columns_name(db);//获取字段名称
	if(sqlite3_exec(db,sql,query_callback,NULL,&errmsg) != SQLITE_OK )
	{
		printf("%s\n",errmsg);
		return -1;
	}
	else
	{
		printf("query done\n ");
		return 0;
	}
}
int do_update_sqlite3(sqlite3 * db)
{
	fruit_t fruit;
	char sql[128];
	char *errmsg;
	int type;

	bzero(&fruit,sizeof(fruit));

	get_local_time(fruit.time);

	printf("input fruit name:");
	scanf("%s",fruit.name);
	getchar();


	if(get_last_row(db,&fruit) != NULL)//系统中已经有这种水果的记录
	{
		puts("*************************************");	
		printf("%s cost:%.2f price:%.2f\n",fruit.name,fruit.cost,fruit.price);
		puts("*************************************");	
		printf("if you update it[1:yes 2:cancel]:");

		scanf("%d",&type);
		getchar();

		char value[20];
		if(type == 1)
		{
			printf("update cost:%.2f of %s [cost|n]:",fruit.cost,fruit.name);
			scanf("%s",value);//输入成本修改成本，输入n放弃修改
			getchar();
			if(strncasecmp(value,"n",strlen("n")) != 0)
				fruit.cost = atof(value);
			
			printf("update price:%.2f of %s [price|n]:",fruit.price,fruit.name);
			scanf("%s",value);//输入单价修单价，输入n放弃修改
			getchar();
			if(strncasecmp(value,"n",strlen("n")) != 0)
				fruit.price = atof(value);
		}
		else
		{
			printf("update cancelled\n");
			return 0;
		}
		sprintf(fruit.in_out,"update");

		sprintf(sql,"insert into fru values('%s','%s',%.4f,%.4f,'%s',%.4f,%.4f,%.4f);",fruit.time,fruit.name,fruit.cost,fruit.price,fruit.in_out,fruit.number,fruit.money,fruit.total);//自增字段的值传NULL
		if(sqlite3_exec(db,sql,query_callback,NULL,&errmsg) != SQLITE_OK )
		{
			printf("%s\n",errmsg);
			return -1;
		}
		else
		{
			printf("update:\n");
			get_columns_name(db);//获取字段名称
			sprintf(sql,"select * from fru where time='%s';",fruit.time);
			sqlite3_exec(db,sql,query_callback,NULL,&errmsg);
			printf("update done\n ");
			return 0;
		}
	}
	else//系统中没有的水果种类
	{
		printf("We don't have this fruit:%s. Please stock it.",fruit.name);
	}
		return 0;
}

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