sqlite3 insert

#include <stdio.h>
#include <sqlite3.h>

int do_insert(sqlite3 *db);
int do_delete(sqlite3 *db);
int do_update(sqlite3 *db);
int do_select(sqlite3 *db);
int main(int argc, const char *argv[])
{
	//创建并打开一个数据库
	sqlite3 *db = NULL;
	if(sqlite3_open("./my.db", &db) != SQLITE_OK)
	{
		fprintf(stderr, "sqlite3_open : %s %d __%d__\n",\
				sqlite3_errmsg(db), sqlite3_errcode(db), __LINE__);
		return -1;
	}
	printf("sqlite3_open my.db success\n");

	//创建数据库表 create table stu(id int, name char, score float);
	char sql[128] = "create table if not exists stu(id int, name char, score float);";
	char *errmsg = NULL;
	if(sqlite3_exec(db, sql, NULL, NULL, &errmsg) != SQLITE_OK)
	{
		fprintf(stderr, "sqlite3_exec: %s %d __%d__\n", errmsg, sqlite3_errcode(db), __LINE__);
		return -1;
	}
	printf("create table stu success\n");

	while(1)
	{
		char choose = 0;
		printf("**************\n");
		printf("****1.插入****\n");
		printf("****2.删除****\n");
		printf("****3.修改****\n");
		printf("****4.查找****\n");
		printf("****5.退出****\n");
		printf("**************\n");
		
		printf("请输入>>>");
		choose = getchar();
		while(getchar()!=10);  //循环读取字符，直到读取到\n退出循环

		switch(choose)
		{
		case '1':
			do_insert(db);
			break;
		case '2':
			do_delete(db);
			break;
		case '3':
			do_update(db);
			break;
		case '4':
		//	do_select(db);
			break;
		case '5':
			goto END;
			break;
		default:
			printf("输入错误\n");
			break;
		}
		
	}

END:
	//关闭数据库
	if(sqlite3_close(db) != SQLITE_OK)
	{
		fprintf(stderr, "sqlite3_close: %s %d __%d__\n",\
				sqlite3_errmsg(db), sqlite3_errcode(db), __LINE__);
		return -1;
	}
	printf("sqlite3_close my.db success\n");

	return 0;
}

int do_insert(sqlite3 *db)
{
		//插入一条数据 insert into stu values(1, 'zs', 80.5);
		char *errmsg = NULL;
		char table[20]="";
		int id = 0;
		char name[20] = "";
		float score =0;
		printf("输入格式：表名 id 姓名 成绩:");
		scanf("%s %d %s %f", table, &id, name, &score);
		while(getchar()!=10);
		char sql[128] = "";
		sprintf(sql, "insert into %s values(%d, '%s', %.2f)\n", table,id, name, score);
		printf("%s", sql);
		if(sqlite3_exec(db, sql, NULL, NULL, &errmsg) != SQLITE_OK)
		{
			fprintf(stderr, "sqlite3_exec: %s %d __%d__\n", errmsg, sqlite3_errcode(db), __LINE__);
			return -1;
		}
		printf("insert into %s success\n", table);
		
	
	return 0;
}
int do_delete(sqlite3 *db)
{

		//删除一条数据 delete from stu where id=1;
		char *errmsg = NULL;
		char table[20]="";
		char cond[20]="";
		printf("输入格式：表名 限制条件:");
		scanf("%s %s", table, cond);
		while(getchar()!=10);
		char sql[128] = "";
		sprintf(sql, "delete from %s where %s\n", table, cond);
		printf("%s", sql);
		if(sqlite3_exec(db, sql, NULL, NULL, &errmsg) != SQLITE_OK)
		{
			fprintf(stderr, "sqlite3_exec: %s %d __%d__\n", errmsg, sqlite3_errcode(db), __LINE__);
			return -1;
		}
		printf("delete from %s success\n", table);
			

	return 0;
}
int do_update(sqlite3 *db)
{

		//修改一条数据 update stu set score=70 where id=1;
		char *errmsg = NULL;
		char table[20]="";
		char cond[20]="";
		char set[20]="";
		printf("输入格式：表名 设置=字段 限制条件:");
		scanf("%s %s %s", table, set, cond);
		while(getchar()!=10);
		char sql[128] = "";
		sprintf(sql, "update %s set %s where  %s\n", table, set, cond);
		printf("%s", sql);
		if(sqlite3_exec(db, sql, NULL, NULL, &errmsg) != SQLITE_OK)
		{
			fprintf(stderr, "sqlite3_exec: %s %d __%d__\n", errmsg, sqlite3_errcode(db), __LINE__);
			return -1;
		}
		printf("update %s set success\n", table);
			

	return 0;
}