通讯录3.0版本

• 一、序言
• 二、功能
• 三、代码
• • 1、主函数
  • 2、函数声明
  • 3、功能函数

一、序言

二、功能

三、代码

1、主函数

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sqlite3.h>
#include"address_list.h"

int main(){
	sqlite3 * pdb;
	int ret;

	ret = sqlite3_open("database.db",&pdb);

	if(ret != SQLITE_OK){
		printf("open database fail! %s\n",sqlite3_errmsg(pdb));
		exit(0);
	}
	else{
		printf("open database success!\n");
	}

	if(create_table(pdb) == SQLITE_OK){
		printf("create or open table success!\n");
	}
	else{
		printf("create or open table fail!\n");
		sqlite3_close(pdb);
		return 0;
	}

	welcome();
	while(1){
		int num;
		printf("请输入你的选择:\n");
		scanf("%d",&num);
		switch(num){
			case 1:
				if(insert_record(pdb) != SQLITE_OK){
					sqlite3_close(pdb);
					exit(-1);
				}
				break;
				
			case 2:
				if(inquire_nocb(pdb) == SQLITE_OK){
					printf("inquire success\n");
				}
				else{
					printf("inquire fail!\n");
				}
				break;

			case 3:
				find_record(pdb);
				break;

			case 4:
				delete_record(pdb);
				break;

			case 5:
				update_data(pdb);
				break;

			case 6:
				sqlite3_close(pdb);
				printf("退出成功\n");
				exit(0);
		}
	}

	return 0;
}

2、函数声明

#ifndef address_list
#define address_list
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sqlite3.h>

void welcome();
int create_table(sqlite3 *pdb);
int insert_record(sqlite3 *pdb);
int inquire_nocb(sqlite3 *pdb);
int find_record(sqlite3 *pdb);
int delete_record(sqlite3 *pdb);
int update_data(sqlite3 *pdb);

#endif

3、功能函数

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sqlite3.h>
#include"address_list.h"


void welcome(){
	printf("*************************************************************************\n");
	printf("****************                                        *****************\n");
	printf("****************             编程从通讯录开始           *****************\n");
	printf("****************                                        *****************\n");
	printf("*************************************************************************\n");
	printf("\n");
	printf("****************      what can I do for you ,sir        *****************\n");
	printf("\n");
	printf("******          1 Add Information!        2 Display List!          ******\n");
	printf("******          3 Information Find!       4 Delete Information     ******\n");
	printf("******          5 Alter Information!      6 Exit!                  ******\n");
	printf("******          7 敬请期待                                         ******\n");
	printf("*************************************************************************\n");
}

int create_table(sqlite3 *pdb){
	char * sql = NULL;
	char *errmsg = NULL;
	int ret;

	sql = "create table if not exists mytable (id int primary key,name text,tel text);";

	ret = sqlite3_exec(pdb,sql,NULL,NULL,&errmsg);

	if(SQLITE_OK != ret){
		printf("create table fail! %s\n",errmsg);
		return -1;
	}
	else{
		return SQLITE_OK;
	}
}

int insert_record(sqlite3 *pdb){
	char sql[100];
	char * errmsg = NULL;
	int ret;
	int id;
	char name[20];
	char tel[20];

	printf("请输入你想增加的成员id： 姓名： 电话号码：\n");
	scanf("%d %s %s",&id,name,tel);

	sprintf(sql,"insert into mytable (id,name,tel) values (%d,'%s','%s');",id,name,tel);

	ret = sqlite3_exec(pdb,sql,NULL,NULL,&errmsg);

	if(ret == SQLITE_OK){
		printf("insert record success\n");
		return SQLITE_OK;
	}
	else{
		printf("insert record fail! %s\n",errmsg);
		return -1;
	}
}

int inquire_nocb(sqlite3 * pdb){
	char * sql = NULL;
	char * errmsg = NULL;
	char **ret_val = NULL;
	int nrow;
	int ncol;
	int ret;
	int i;

	sql = "select * from mytable;";

	ret = sqlite3_get_table(pdb,sql,&ret_val,&nrow,&ncol,&errmsg);

	if(ret == SQLITE_OK){
		printf("nrow = %d,ncol = %d\n",nrow,ncol);

		for(i = 0; i < (nrow + 1) * ncol;i++){
			printf("%-15s",ret_val[i]);

			if((i + 1) % ncol == 0){
				printf("\n");
			}
		}
	}
	else{
		sqlite3_free_table(ret_val);

		return -1;
	}

	sqlite3_free_table(ret_val);

}

int find_record(sqlite3 *pdb){
	char sql[100];
	char * errmsg = NULL;
	char ** ret_val = NULL;
	char name[20];
	int nrow;
	int ncol;
	int ret;
	int i;

	printf("please input you want to find name:\n");
	scanf("%s",name);

	sprintf(sql,"select * from mytable where name = '%s';",name);

	ret = sqlite3_get_table(pdb,sql,&ret_val,&nrow,&ncol,&errmsg);
	
	if(ret == SQLITE_OK){
		printf("nrow = %d,ncol = %d\n",nrow,ncol);
		for(i = 0;i < (nrow + 1) * ncol;i++){
			printf("%-15s",ret_val[i]);
			if((i+1) % ncol == 0){
				printf("\n");
			}
		}
		return SQLITE_OK;
	}
	else{
		printf("find fail! %s\n",errmsg);
		return -1;
	}

}

int delete_record(sqlite3 * pdb){
	char sql[100];
	char * errmsg = NULL;
	int ret;
	char name[20];

	printf("请输入你想删除人的姓名:\n");
	scanf("%s",name);

	sprintf(sql,"delete from mytable where name = '%s';",name);

	ret = sqlite3_exec(pdb,sql,NULL,NULL,&errmsg);
	if(ret == SQLITE_OK){
		printf("delete success!\n");
		return SQLITE_OK;
	}
	else{
		printf("delete fail! %s\n",errmsg);
		return -1;
	}
}

int update_data(sqlite3 * pdb){
	char sql[100];
	char * errmsg = NULL;
	int ret;
	char name[20];
	char rename[20];
	int id;
	char tel[20];
	int num;

	printf("请输入你想修改人的姓名：\n");
	scanf("%s",name);
	printf("请输入你想更改的信息：\n");
	printf("1----id\n");
	printf("2----name\n");
	printf("3----tel\n");
	scanf("%d",&num);

	switch(num){
		case 1:
			printf("更改id的功能在维护\n");
			break;

		case 2:
			printf("请输入你想更改的名字:\n");
			scanf("%s",rename);

			sprintf(sql,"update mytable set name='%s' where name='%s';",rename,name);

			ret = sqlite3_exec(pdb,sql,NULL,NULL,&errmsg);
			if(ret == SQLITE_OK){
				printf("update message success!\n");
				return SQLITE_OK;
			}
			else{
				printf("updata message fail! %s\n",errmsg);
				return -1;
			}
			break;

		case 3:
			printf("更改电话号码功能维护中\n");
			break;
	}
}